Articles de revues : « Conventional Doppler »

1

Sacks, D. « Conventional vs color carotid Doppler imaging. » American Journal of Roentgenology 156, n^o 4 (avril 1991) : 873–74. http://dx.doi.org/10.2214/ajr.156.4.2043209.

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Dickerson, K. S., V. L. Newhouse, P. Tortoli et G. Guidi. « Comparison of conventional and transverse Doppler sonograms ». Journal of Ultrasound in Medicine 12, n^o 9 (septembre 1993) : 497–506. http://dx.doi.org/10.7863/jum.1993.12.9.497.

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Wright, I. A., N. D. Pugh, K. Lyons, D. J. T. Webster et R. E. Mansel. « Power Doppler in breast tumours : a comparison with conventional colour doppler imaging ». European Journal of Ultrasound 7, n^o 3 (août 1998) : 175–81. http://dx.doi.org/10.1016/s0929-8266(98)00040-8.

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BIBRA, HELENE VON, HANS-ULRICH STEMPFLE, ALEXANDER POLL, MICHAEL SCHERER, GÜNTHER BLÜML et HANS BLOMER. « Limitations of Flow Detection by Color Doppler : In Vitro Comparison to Conventional Doppler ». Echocardiography 8, n^o 6 (novembre 1991) : 633–42. http://dx.doi.org/10.1111/j.1540-8175.1991.tb01025.x.

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Gera, B. S., S. P. Singal et Neeraj Saxena. « Establishing a Conventional Doppler Sodar cum Doppler Minisodar at the National Physical Laboratory ». Journal of Atmospheric and Oceanic Technology 14, n^o 3 (juin 1997) : 527–32. http://dx.doi.org/10.1175/1520-0426(1997)014<0527:eacdsc>2.0.co;2.

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Das, K. M., K. Prasad, W. Szmigielski et N. Noorani. « Intratesticular varicocele : evaluation using conventional and Doppler sonography. » American Journal of Roentgenology 173, n^o 4 (octobre 1999) : 1079–83. http://dx.doi.org/10.2214/ajr.173.4.10511183.

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Fernando, Charitha, et Janis Letourneau. « Conventional Duplex and Color Doppler Ultrasonography of Pseudoaneurysms ». Seminars in Interventional Radiology 7, n^o 03/04 (janvier 1990) : 185–91. http://dx.doi.org/10.1055/s-2008-1074607.

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Gross, Ruth, Vincenzo Penna, Holger Bannasch, G. Stark, Steffen Eisenhardt et Yvonne Lenz. « Evaluation of the Implantable Doppler Probe for Free Flap Monitoring in Lower Limb Reconstruction ». Journal of Reconstructive Microsurgery 34, n^o 03 (27 novembre 2017) : 218–26. http://dx.doi.org/10.1055/s-0037-1608628.

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Background Timely reexploration and reanastomoses can salvage failing free flaps. The use of the implantable Doppler probe provides direct evidence of vascular impairment of the microvascular anastomoses and allows for postoperative NPWT. The aim of this retrospective study was to compare the Doppler probe to conventional monitoring techniques for free flap monitoring in lower limb reconstruction and to identify risk factors for perfusion disturbance and reexploration. Methods All patients receiving free muscle flap reconstruction for lower limb soft tissue defects at our department from 2000 to 2013 were included, and all adverse events, timely detection of perfusion problems, and outcome of revision surgery were assessed by chart analysis. Results For lower limb reconstruction, 110 free muscle transfers were performed of which 41 muscle flaps were conventionally monitored and 69 flaps were monitored using the implantable Doppler probe. In 18 cases, the free muscle flaps needed revision because of perfusion disturbances. The salvage rate was 80% with monitoring by the implantable Doppler probe compared with 62.5% using conventional monitoring methods resulting in success rates of 95.7 and 92.7%, respectively. Conclusion The use of the implantable Cook–Swartz Doppler probe represents a safe monitoring method for lower limb reconstruction, which allows for the additional use of NPWT. Higher salvage and revision success rates can be attributed to an earlier detection of perfusion impairment. However, a larger patient cohort is necessary to verify superiority over conventional postoperative monitoring.

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Keener, Thomas S., Hanh Vu Nghiem, John N. Krieger, Richard E. Berger, Ivan Rothman, Thomas C. Winter et Laurence Mack. « Comparison of Conventional Color Doppler With Power Doppler Sonograhy to Depict Normal Prostatic Vasculature ». Journal of Diagnostic Medical Sonography 13, n^o 2 (mars 1997) : 63–67. http://dx.doi.org/10.1177/875647939701300201.

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Thomsen, J. B., J. A. Sørensen, P. Grupe, J. Karstoft et A. Krogdahl. « Staging N0 oral cancer : lymphoscintigraphy and conventional imaging ». Acta Radiologica 46, n^o 5 (août 2005) : 492–96. http://dx.doi.org/10.1080/02841850510021373.

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Purpose: To compare sentinel lymph node biopsy, magnetic resonance imaging (MRI), Doppler ultrasonography, and palpation as staging tools in patients with T1/T2 N0 cancer of the oral cavity. Material and Methods: Forty consecutive patients were enrolled (17 F and 23 M, aged 32–90 years), 24 T1 and 16 T2 cN0 squamous cell carcinoma of the oral cavity. Palpation was carried out by two observers prior to inclusion. MRI, gray-scale and Doppler ultrasonography were performed. Lymphoscintigraphies were done after peritumoral injections of 99mTc labelled rheniumsulphide nanocolloid, followed by sentinel lymph node biopsy guided by a gamma probe and Patent Blue. Palpation, Doppler ultrasonography, MRI, and sentinel lymph node biopsy were compared to a combination of histopathology and follow-up. Diagnostic testing was performed using the x2 test. Results: Histopathological examination revealed metastatic spread to the neck in 14 of 40 patients. One patient had bilateral neck disease. Sentinel lymph node biopsy and ultrasonography were performed in 80 neck sides of 40 patients and MRI in 70 neck sides (5 patients were claustrophobic). SN revealed suspicious lymph nodes in 12 necks, ultrasonography in 23 necks, and MRI in 9 necks. The positive predictive value of sentinel lymph node biopsy was 100%, ultrasonography 57%, and MRI 56%. The respective negative predictive values were 96%, 96%, and 85%. The sensitivity of sentinel lymph node biopsy 80% was comparable to ultrasonography 87%, but the sensitivity of MRI 36% was low. The specificities were 100%, 85%, and 93%, respectively. By combined sentinel lymph node biopsy and ultrasonography the overall sensitivity could have been 100%. Conclusion: Sentinel lymph node biopsy improved staging of patients with small N0 oral cancers. Combined sentinel lymph node biopsy and Doppler ultrasonography may further improve staging. MRI and simple palpation results were poor.

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Buy, J. N., M. A. Ghossain, D. Hugol, K. Hassen, C. Sciot, J. B. Truc, P. Poitout et D. Vadrot. « Characterization of adnexal masses : combination of color Doppler and conventional sonography compared with spectral Doppler analysis alone and conventional sonography alone. » American Journal of Roentgenology 166, n^o 2 (février 1996) : 385–93. http://dx.doi.org/10.2214/ajr.166.2.8553953.

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Kim, Hyun Gi, et Jang Hoon Lee. « Feasibility of Ultrafast Doppler technique for cranial ultrasound in neonates ». Medical Ultrasonography 21, n^o 3 (31 août 2019) : 288. http://dx.doi.org/10.11152/mu-1901.

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Aims: The aim of this study was to compare the performances of Ultrafast Doppler ultrasound (US) with classic Doppler US, for cranial ultrasound in neonates.Materials and methods: We measured the peak systolic velocity (PSV), end-diastolic velocity (EDV) and resistive index (RI) of the anterior cerebral artery (ACA), middle cerebral artery (MCA) and posterior cerebral artery (PCA) in neonates using both conventional and Ultrafast Doppler US and acquisition times were compared. Distal ACA branches were assessed with Ultrafast Doppler US.Results: A total of 138 neonates were included. The PSV and EDV of the cranial arteries were comparable between the two Doppler methods (PSV, 64.6-85.5 cm/s vs. 63.4-84.1 cm/s, p=0.100-0.510; EDV, 19.1-26.5 cm/s vs. 17.8-24.2 cm/s, p=0.100-0.981). The RIs of the ACA and PCA were not significantly different (0.69-0.73 vs 0.68-0.74, p=0.174-0.810). Ultrafast Doppler US required shorter acquisition times than conventional Doppler US (6.7 s vs. 11.0 s, p=0.003). The PSV and EDV of the distal ACA were higher than the proximal ACA (20.1-63.3 cm/s vs. 9.4-36.7, p<0.001) although the RI was similar (0.69 vs. 0.68, p=0.251).Conclusions: Ultrafast Doppler US provides comparable values to conventional Doppler US with shorter acquisition times. This novel imaging technique provides quantitative information and is suitable for distal cranial artery evaluation.

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D, Smitha J., Srisha Basappa, Nishath Khanum, Santosh Kanwar, Archana Patil et Mahesh M S. « Comparative evaluation of conventional radiography and color doppler ultrasound imaging in differentiating periapical lesions ». Annals of Oral Health and Dental Research 2, n^o 1 (17 janvier 2018) : A15–20. http://dx.doi.org/10.21276/aohdr.2015.

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Karabiyik, Yucel, Ingvild Kinn Ekroll, Sturla H. Eik-Nes et Lasse Lovstakken. « Quantitative Doppler Analysis Using Conventional Color Flow Imaging Acquisitions ». IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control 65, n^o 5 (mai 2018) : 697–708. http://dx.doi.org/10.1109/tuffc.2018.2808226.

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Hoskins, P. « Comparison of Power Doppler with conventional colour flow imaging ». European Journal of Ultrasound 6 (novembre 1997) : S40—S41. http://dx.doi.org/10.1016/s0929-8266(97)87278-3.

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Lee, Ching-Chih, et Chih-Wei Chen. « The Impact of Sleep Apnea on Conventional Doppler Indices ». Tzu Chi Medical Journal 21, n^o 3 (septembre 2009) : 210–17. http://dx.doi.org/10.1016/s1016-3190(09)60041-0.

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Garcia, Damien, Juan Carlos del Álamo, Cristina Cortina, Raquel Yotti, David Tanné, Éric Bertrand, Miguel A. García-Fernández, Francisco Fernández-Avilés et Javier Bermejo. « FULL INTRAVENTRICULAR FLOW MAPPING BY CONVENTIONAL COLOR-DOPPLER ECHOCARDIOGRAPHY ». Journal of Biomechanics 41 (juillet 2008) : S151. http://dx.doi.org/10.1016/s0021-9290(08)70151-9.

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Xun, Lizhang, Lamei Zhai et Hui Xu. « Comparison of conventional, doppler and contrast-enhanced ultrasonography in differential diagnosis of ovarian masses : a systematic review and meta-analysis ». BMJ Open 11, n^o 12 (décembre 2021) : e052830. http://dx.doi.org/10.1136/bmjopen-2021-052830.

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ObjectivesTo assess the value of conventional, Doppler and contrast-enhanced ultrasonography (CEUS) (conventional ultrasonography (US), Doppler US and CEUS) for diagnosing ovarian cancer.DesignSystematic review and meta-analysis.Data sourcesPubMed, Embase and the Cochrane Library were conducted for studies published until October 2021.Eligibility criteriaStudies assessed the diagnostic value of conventional US, Doppler US or CEUS for detecting ovarian cancer, with no restrictions placed on published language and status.Data extraction and synthesisThe study selection and data extraction were performed by two independent authors. The sensitivity, specificity, positive and negative likelihood ratio (PLR and NLR), diagnostic OR (DOR) and area under the receiver operating characteristic curve (AUC) were pooled using the bivariate generalised linear mixed model and random effects model.ResultsThe meta-analysis included 72 studies and involved 9296 women who presented with ovarian masses. The pooled sensitivity, specificity, PLR, NLR, DOR and AUC for conventional US were 0.91 (95% CI: 0.87 to 0.94) and 0.87 (95% CI: 0.82 to 0.91), 6.87 (95% CI: 4.98 to 9.49) and 0.10 (95% CI: 0.07 to 0.15), 57.52 (95% CI: 36.64 to 90.28) and 0.95 (95% CI: 0.93 to 0.97), respectively. The sensitivity, specificity, PLR, NLR, DOR and AUC for Doppler US were 0.93 (95% CI: 0.91 to 0.95) and 0.85 (95% CI: 0.80 to 0.89), 6.10 (95% CI: 4.59 to 8.11) and 0.08 (95% CI: 0.06 to 0.11), 61.76 (95% CI: 39.99 to 95.37) and 0.96 (95% CI: 0.94 to 0.97), respectively. The pooled sensitivity, specificity, PLR, NLR, DOR and AUC for CEUS were 0.97 (95% CI: 0.92 to 0.99) and 0.92 (95% CI: 0.85 to 0.95), 11.47 (95% CI: 6.52 to 20.17) and 0.03 (95% CI: 0.01 to 0.09), 152.11 (95% CI: 77.77 to 297.51) and 0.99 (95% CI: 0.97 to 0.99), respectively. Moreover, the AUC values for conventional US (p=0.002) and Doppler US (p=0.005) were inferior to those of CEUS.ConclusionsConventional US, Doppler US and CEUS have a relatively high differential diagnostic value for differentiating between benign and malignant ovarian masses. The diagnostic performance of CEUS was superior to that of conventional US and Doppler US.

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Yoshizawa, Shingo, Takashi Saito, Yusaku Mabuchi, Tomoya Tsukui et Shinichi Sawada. « Parallel Resampling of OFDM Signals for Fluctuating Doppler Shifts in Underwater Acoustic Communication ». Journal of Electrical and Computer Engineering 2018 (4 novembre 2018) : 1–11. http://dx.doi.org/10.1155/2018/3579619.

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Reliable underwater acoustic communication is demanded for autonomous underwater vehicles (AUVs) and remotely operated underwater vehicles (ROVs). Orthogonal frequency-division multiplexing (OFDM) is robust with multipath interference; however, it is sensitive to Doppler. Doppler compensation is given by two-step processing of resampling and residual carrier frequency offset (CFO) compensation. This paper describes the improvement of a resampling technique. The conventional method assumes a constant Doppler shift during a communication frame. It cannot cope with Doppler fluctuation, where relative speeds between transmitter and receiver units are fluctuating. We propose a parallel resampling technique that a resampling range is extended by measured Doppler standard deviation. The effectiveness of parallel resampling has been confirmed in the communication experiment. The proposed method shows better performance in bit error rates (BERs) and frame error rates (FERs) compared with the conventional method.

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Bakke, S. J., H. J. Smith, E. Kerty et A. Dahl. « Cervicocranial Artery Dissection ». Acta Radiologica 37, n^o 3P2 (mai 1996) : 529–34. http://dx.doi.org/10.1177/02841851960373p220.

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Purpose: To evaluate pulsed Doppler ultrasound and MR angiography (MRA) in the diagnosis of cervicocranial dissection. Material and Methods: Fourteen patients with cervicocranial artery dissection were examined over a 3-year period. Twelve patients had dissection of the extracranial part of the internal carotid artery, and 2 had vertebral artery dissection. All patients were examined with pulsed Doppler ultrasound. In addition, all patients had conventional angiography (n=9) and/or MR imaging including MRA (n=9). Results: Doppler ultrasound disclosed unspecific abnormalities in 11 of 14 dissected vessels; 3 patients had false-negative Doppler findings. MRA showed vessel abnormalities in 9 of 9 patients; 2 vessels were occluded, and 7 vessels had changes typical of dissection (double lumen and/or string sign). Twelve patients had follow-up examinations with pulsed Doppler ultrasound (n=12), conventional angiography (n=3), and MRA/MR (n=11). Follow-up Doppler showed complete or partial normalization in 61 of 9 patients, all confirmed by either angiography or MRA. Conclusion: Our findings suggest that Doppler ultrasound may be used in follow-up of pathologic Doppler findings in known dissections, and that MRA may replace angiography in the confirmative diagnosis of cervicocranial dissection.

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Yoldaş, Tamer, Şule Yeşil, Selmin Karademir, Gürses Şahin, Utku Arman Örün, Vehbi Doğan et Senem Özgür. « Evaluation of long-term cardiac side effects of anthracycline chemotherapy by conventional and non-conventional echocardiographic methods in childhood cancer survivors ». Cardiology in the Young 29, n^o 7 (20 juin 2019) : 904–9. http://dx.doi.org/10.1017/s1047951119001094.

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AbstractObjective:Anthracycline chemotherapeutic agents carry the well-recognised risk of cardiac toxicity. The aim of this study was to determine the long-term effect of anthracycline chemotherapy on the biventricular function in childhood cancer survivors using tissue Doppler imaging and two-dimensional speckle tracking echocardiography.Patients and Methods:The study included 45 survivors of childhood cancers and 50 healthy age-matched control patients. Cardiac function was prospectively studied with conventional echocardiography, tissue Doppler imaging, and speckle tracking echocardiography after completion of treatment. The same analysis was performed on matched controls.Results:There was no difference in age, gender, height, and weight between the study and control groups. The mean anthracycline dose was 240 ± 106 mg/m2 and the mean remission duration was 8.2 ± 5 years (1–20 years) in the study group. Conventional echocardiography showed similar ejection fraction, shortening fraction, and left ventricle end-diastolic diameter in both groups. Mitral lateral and septal tissue Doppler imaging showed normal but according to control group relatively sub-normal systolic and diastolic function in patient group. The global longitudinal and circumferential strain and strain rates were significantly lower in the patient group compared to control group. Correlation analysis revealed a negative and significant correlation between total anthracycline dose and global longitudinal and circumferential strain and strain rates.Conclusion:Sub-clinical systolic and diastolic dysfunction may not be detected by conventional echocardiographic methods which are frequently used in daily practice. Sub-clinical systolic and diastolic dysfunction may be detected more sensitively by echocardiographic method such as speckle tracking echocardiography in childhood cancer survivors.

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AbuRahma, Ali F., Kim Jarrett et J. David Hayes. « Clinical Implications of Power Doppler Three-Dimensional Ultrasonography ». Vascular 12, n^o 5 (septembre 2004) : 293–300. http://dx.doi.org/10.1258/rsmvasc.12.5.293.

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Power Doppler ultrasonography displays an estimate of the entire power contained in that part of the received radiofrequency ultrasound signal for which a phase shift corresponding to the motion of the target is detected. In contrast, conventional color Doppler imaging displays Doppler frequency shift information. Few reports have been published on the clinical utility of three-dimensional power Doppler ultrasonography in vascular patients. This study analyzed our experience of the clinical utility of this technology. Fifty-three patients selected out of 281 who were referred to our vascular laboratory underwent both conventional color duplex ultrasonography and power Doppler ultrasonography for the following indications: the question of subtotal versus total arterial occlusion, tortuous artery with limited imaging on color duplex ultrasonography, the presence of significant disease by Doppler ultrasonography with limited imaging, deep-lying arteries with an obscure orifice (eg, renal artery), and heavily calcified arteries. The power Doppler ultrasonography portion of the examination was considered of positive diagnostic value if the final impression was different from that of conventional color duplex ultrasonography. A positive diagnostic value was achieved in 22 of 29 (76%) carotid artery examinations, 10 of 14 (71%) peripheral artery examinations, 4 of 5 (80%) renal artery examinations, and 3 of 5 (60%) aortoiliac examinations. Overall, positive diagnostic value was achieved by adding power Doppler ultrasonography in 39 of 53 patients (74%). Five of six patients (83%) who were felt to have carotid occlusion by color duplex ultrasonography were confirmed to have subtotal occlusion by power Doppler ultrasonography. Similarly, 6 of 8 patients (75%) with questionable subtotal versus total peripheral arterial occlusion by color duplex ultrasonography were confirmed to have subtotal occlusion by power Doppler ultrasonography. Four of five patients' (80%) renal examinations had a positive diagnostic value, which included three patients in whom the orifice of renal arteries was not seen by color duplex ultrasonography. Three-dimensional power Doppler ultrasonography can be more readily applied to clinical practice. Power Doppler ultrasonography is capable of defining the severity or extent of vascular disease, particularly in differentiating subtotal from total arterial occlusion.

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Clautice-Engle, T., R. B. Jeffrey, K. C. Li et R. A. Barth. « Power Doppler imaging of focal lesions of the gastrointestinal tract : comparison with conventional color Doppler imaging. » Journal of Ultrasound in Medicine 15, n^o 1 (1 janvier 1996) : 63–66. http://dx.doi.org/10.7863/ultra.15.1.63.

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Clautice-Engle, T., R. B. Jeffrey, K. C. Li et R. A. Barth. « Power Doppler imaging of focal lesions of the gastrointestinal tract : comparison with conventional color Doppler imaging. » Journal of Ultrasound in Medicine 15, n^o 1 (janvier 1996) : 63–66. http://dx.doi.org/10.7863/jum.1996.15.1.63.

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Santos, V. J. C., K. M. M. G. Simplício, D. C. C. Sanchez, V. T. Almeida, P. P. M. Teixeira, L. N. Coutinho, L. F. S. Rodrigues, M. E. F. Oliveira, M. A. R. Feliciano et W. R. R. Vicente. « Conventional and Doppler ultrasonography on a goat with gangrenous mastitis ». Arquivo Brasileiro de Medicina Veterinária e Zootecnia 66, n^o 6 (décembre 2014) : 1931–35. http://dx.doi.org/10.1590/1678-7062.

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Cahill, Bruce E., Edward V. Ross, Roger W. Pielet, Janet C. Rice, Ronald W. Lewis et Morris D. Kerstein. « Measurement of Impotence by Laser Doppler Flowmetry and Conventional Methodology ». Journal of Urology 140, n^o 4 (octobre 1988) : 749–50. http://dx.doi.org/10.1016/s0022-5347(17)41802-7.

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Maurice, Mark S. « Particle size distribution technique using conventional laser Doppler velocimetry measurements ». AIAA Journal 34, n^o 6 (juin 1996) : 1209–15. http://dx.doi.org/10.2514/3.13214.

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Liu, Zongyu, Fan Yang, Yong Zhang, Huimei Yu, He Zhu, Ruiqi Yang et Limei Fan. « Conventional, Doppler and Contrast-Enhanced Ultrasonography in Differential Diagnosis of Ovarian Masses ». Cellular Physiology and Biochemistry 39, n^o 6 (2016) : 2398–408. http://dx.doi.org/10.1159/000452508.

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Background: Differential diagnosis of ovarian masses can influence both treatment selection and prognosis of ovarian tumor patients. A comprehensive review was performed with respect to the diagnostic value of conventional ultrasonography, Doppler ultrasonography and contrast-enhanced ultrasonography (CEUS) in differentiating benign from malignant ovarian masses. Methods: Databases were searched for relevant articles. Retrieved studies were screened according to the inclusion criteria. Pooled statistics including specificity, sensitivity, positive likelihood ratios (PLR), negative likelihood ratios (NLR), diagnostic odds ratio (DOR) and area under curve (AUC) were utilized to calculate the overall diagnostic value for each diagnostic approach. Results: Sixty-seven high quality articles were finally enrolled in the present meta-analysis. The sensitivity and specificity of conventional US were 0.92 and 0.86, respectively. The corresponding sensitivity and specificity of Doppler US were 0.93 and 0.85, respectively. Additionally, these figures for CEUS were 0.97 and 0.92, respectively. Finally, the AUC values for conventional US, Doppler US and CEUS were 0.95, 0.96 and 0.99, respectively. Conclusion: All of the three US-related imaging modalities have relatively high diagnostic value in distinguishing malignant tumors from benign ones in ovarian tumors.

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Li, Wei, Yuanfu Xie, Shiow-Ming Deng et Qi Wang. « Application of the Multigrid Method to the Two-Dimensional Doppler Radar Radial Velocity Data Assimilation ». Journal of Atmospheric and Oceanic Technology 27, n^o 2 (1 février 2010) : 319–32. http://dx.doi.org/10.1175/2009jtecha1271.1.

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Abstract In recent years, the Earth System Research Laboratory (ESRL) of the National Oceanic and Atmospheric Administration (NOAA) has developed a space and time mesoscale analysis system (STMAS), which is currently a sequential three-dimensional variational data assimilation (3DVAR) system and is developing into a sequential 4DVAR in the near future. It is implemented by using a multigrid method based on a variational approach to generate grid analyses. This study is to test how STMAS deals with 2D Doppler radar radial velocity and to what degree the 2D Doppler radar radial velocity can improve the conventional (in situ) observation analysis. Two idealized experiments and one experiment with real Doppler radar radial velocity data, handled by STMAS, demonstrated significant improvement of the conventional observation analysis. Because the radar radial wind data can provide additional wind information (even it is incomplete: e.g., missing tangential wind vector), the analyses by assimilating both radial wind data and conventional data showed better results than those by assimilating only conventional data. Especially in the case of sparse conventional data, radar radial wind data can provide significant information and improve the analyses considerably.

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Baek, K. R., M. H. Bae et S. B. Park. « A New Aliasing Extension Method for Ultrasonic 2-Dimensional Pulsed Doppler Systems ». Ultrasonic Imaging 11, n^o 4 (octobre 1989) : 233–44. http://dx.doi.org/10.1177/016173468901100402.

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The mean frequency aliasing problem originating from the pulse repetition frequency is one of major limitations in ultrasound pulsed Doppler systems. A conventional approach to resolving this problem is to track the mean frequencies close to and beyond the Nyquist frequency along the temporal axis. In this paper, a new concept of tracking the mean frequencies along the spatial axis is proposed for the same problem. The technique is fault tolerable and more suitable for multigate and 2-D Doppler systems than conventional methods. Simulation and experimental results show that the proposed system has improved performance compared with that of the conventional systems.

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Evans, David H., Jørgen Arendt Jensen et Michael Bachmann Nielsen. « Ultrasonic colour Doppler imaging ». Interface Focus 1, n^o 4 (6 mai 2011) : 490–502. http://dx.doi.org/10.1098/rsfs.2011.0017.

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Ultrasonic colour Doppler is an imaging technique that combines anatomical information derived using ultrasonic pulse-echo techniques with velocity information derived using ultrasonic Doppler techniques to generate colour-coded maps of tissue velocity superimposed on grey-scale images of tissue anatomy. The most common use of the technique is to image the movement of blood through the heart, arteries and veins, but it may also be used to image the motion of solid tissues such as the heart walls. Colour Doppler imaging is now provided on almost all commercial ultrasound machines, and has been found to be of great value in assessing blood flow in many clinical conditions. Although the method for obtaining the velocity information is in many ways similar to the method for obtaining the anatomical information, it is technically more demanding for a number of reasons. It also has a number of weaknesses, perhaps the greatest being that in conventional systems, the velocities measured and thus displayed are the components of the flow velocity directly towards or away from the transducer, while ideally the method would give information about the magnitude and direction of the three-dimensional flow vectors. This review briefly introduces the principles behind colour Doppler imaging and describes some clinical applications. It then describes the basic components of conventional colour Doppler systems and the methods used to derive velocity information from the ultrasound signal. Next, a number of new techniques that seek to overcome the vector problem mentioned above are described. Finally, some examples of vector velocity images are presented.

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Santibanez, Francisco, Thomas Kierski, Ryan Deruiter, Rebecca Jones, Danai Soulioti, Jake McCall, Hatim Belgharbi, Davis Crews, Paul A. Dayton et Gianmarco Pinton. « Super-resolution imaging using conventional and non-conventional beamforming ». Journal of the Acoustical Society of America 151, n^o 4 (avril 2022) : A53. http://dx.doi.org/10.1121/10.0010633.

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Super-resolution ultrasound surpasses diffraction limits by localizing spatio-temporally separable contrast agents and generates images that significantly exceed the resolution of conventional B-mode imaging methods. However, the ability to detect contrast agents and to separate their signal from the underlying tissue and from sources of image degradation such as phase aberration or reverberation clutter remains a process that is governed by fundamental wave propagation and beamforming. Here, super-resolution imaging and improvements in contrast detection, imaging depth, resolution, and registration accuracy are demonstrated using conventional and non-conventional beamforming methods in 2D and 3D. Three different imaging schemes: (a) single plane-wave, (b) three steered plane-wave compounding, and (c) 256 focused transmits are compared in vivo to quantify the improvements in contrast detection. Wide-beam 3D transcranial super-resolution and power Doppler images through a human and macaque skull are demonstrated using a 1.5 MHz sparse matrix array. These partially and fully focused methods are also demonstrated transcranially in rodents using 2D imaging at 15 MHz and volumetric imaging at 8 MHz. Finally super-harmonic super-resolution imaging approaches are demonstrated for stationary and moving bubbles in murine tumors. These imaging methods extend the capabilities of super-resolution imaging and may improve the clinical translatability of the technique.

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Demené, Charlie, Mathieu Pernot, Valérie Biran, Marianne Alison, Mathias Fink, Olivier Baud et Mickaël Tanter. « Ultrafast Doppler Reveals the Mapping of Cerebral Vascular Resistivity in Neonates ». Journal of Cerebral Blood Flow & ; Metabolism 34, n^o 6 (26 mars 2014) : 1009–17. http://dx.doi.org/10.1038/jcbfm.2014.49.

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In vivo mapping of the full vasculature dynamics based on Ultrafast Doppler is showed noninvasively in the challenging case of the neonatal brain. Contrary to conventional pulsed-wave (PW) Doppler Ultrasound limited for >40 years to the estimation of vascular indices at a single location, the ultrafast frame rate (5,000 Hz) obtained using plane-wave transmissions leads to simultaneous estimation of full Doppler spectra in all pixels of wide field-of-view images within a single cardiac cycle and high sensitivity Doppler imaging. Consequently, 2D quantitative maps of the cerebro-vascular resistivity index (RI) are processed and found in agreement with local measurements obtained on large arteries of healthy neonates using conventional PW Doppler. Changes in 2D resistivity maps are monitored during recovery after therapeutic whole-body cooling of full-term neonates treated for hypoxic ischemic encephalopathy. Arterial and venous vessels are unambiguously differentiated on the basis of their distinct hemodynamics. The high spatial (250 × 250 μm2) and temporal resolution (<1 ms) of Ultrafast Doppler imaging combined with deep tissue penetration enable precise quantitative mapping of deep brain vascular dynamics and RI, which is far beyond the capabilities of any other imaging modality.

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Ozdemir, Osman, Pinar Isik Agras, Yusuf Aydin, Ayhan Abaci, Samil Hizli, Halil Ibrahim Akkus et Cihan Fidan. « Assessment of cardiac functions using tissue Doppler imaging in children with familial Mediterranean fever ». Cardiology in the Young 22, n^o 2 (19 août 2011) : 188–93. http://dx.doi.org/10.1017/s1047951111001168.

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AbstractObjectiveFamilial Mediterranean fever may carry a potential for cardiovascular disorders because of sustained inflammation during its course; however, there has been a limited number of studies investigating the cardiac functions in children. The aim of this study was to assess both ventricular diastolic functions using conventional echocardiography and tissue Doppler imaging in children with familial Mediterranean fever.Patients and methodsThe study population included 25 patients with familial Mediterranean fever – mean age was 11.8 plus or minus 5.30 years – and 23 healthy patients as controls – mean age was 9.88 plus or minus 3.69 years. Both ventricular functions were measured using echocardiography comprising standard M-mode and conventional Doppler and tissue Doppler imaging during an attack-free period.ResultsThe conventional echocardiographic parameters with myocardial performance index were in normal ranges and similar in patients with familial Mediterranean fever and controls, with a p-value more than 0.05. However, right ventricular diastolic dysfunction was observed in patients with familial Mediterranean fever documented by tissue Doppler imaging, with a p-value less than 0.05 for E't and A't wave ratio.ConclusionUsing tissue Doppler imaging, we have demonstrated that although left ventricular functions were comparable in the patients and healthy children, right ventricular diastolic function indices were impaired in patients with familial Mediterranean fever during childhood. Impaired right ventricular diastolic function may be an early manifestation of cardiac involvement in children with familial Mediterranean fever.

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Jiao, Yang, Derong Zhang, Yiwen Xu, Yang Chen, Zhe Wu et Yaoyao Cui. « H-scan Subtraction Doppler Imaging : A Novel Ultrasound Small Blood Vessel Flow Characterization with Scattering and Reflection Identification ». Applied Sciences 10, n^o 21 (28 octobre 2020) : 7604. http://dx.doi.org/10.3390/app10217604.

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Ultrafast compound Doppler imaging (UCDI), which can be used to acquire Doppler information at very high spatial and temporal sampling rates, provides a great improvement to the characterization of the vasculature. The singular value decomposition (SVD) technique takes advantage of the different features of tissue and blood motion in terms of spatiotemporal coherence and strongly outperforms conventional clutter rejection filters in small animals. However, a major challenge of conventional UCDI with SVD clutter filtering for small vessel imaging is that it is not sensitive enough to detect the hemodynamic changes in deep tissue where the majority of the remaining signal is usually noise-saturated. In this study, with the first attempt to apply ultrasonic tissue characterization techniques to UCDI, we propose an H-scan subtraction Doppler imaging method to bypass the limitations associated with the high-order singular value thresholding selection and improve the image quality of fine vessels. The flow phantom experiments with different blood concentrations show that H-Scan is capable of estimating the relative size and spatial distribution of acoustic scattering objects. In the in vivo rabbit brain experiment, the H-Doppler method, together with the global and block-wise local SVD clutter filtering, are proposed to facilitate better power Doppler images with a significant improvement of background noise suppression. These results demonstrate that the contrast-to-noise-ratio (CNR) of the H-scan subtraction Doppler imaging is 15% to 65% higher than that of the conventional UCDI methods. Therefore, this approach can be potentially applied to the clinical applications of the functional ultrasound (fUS) imaging method.

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De Oliveira Andrade, Luis Jesuino, Maria Helena Ferreira Andrade, Thomaz Cruz, Larissa Santos França, Luciana Santos França et Alcina Maria Vinhaes Bittencourt. « Color flow doppler ultrasonography in Hashimoto’s Thyroiditis ». Revista de Ciências Médicas e Biológicas 10, n^o 1 (8 juillet 2011) : 14. http://dx.doi.org/10.9771/cmbio.v10i1.4812.

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<p class="MsoNormal" style="text-align: justify; line-height: normal; margin: 0cm 0cm 0pt;">Objective: To evaluate if the vascularization patterns in the thyroid gland parenchyma by the conventional ultrasound mode B, and color Doppler ultrasonography correlated with the peak systolic velocity (PSV) of the inferior thyroid artery using pulsed Doppler in patients with Hashimoto’s thyroiditis (HT) in various stages. Methods: Patients with diagnosis of HT were enrolled in this prospective study in the period two years. Thyroid glands of all patients were evaluated with conventional ultrasound mode B, color-flow Doppler ultrasonography, and peak systolic velocity (PSV) of the inferior thyroid artery. Data were analyzed applying variance (ANOVA) and Pearson’s or Spearman’s correlation. Results: A hundred twenty patients (10 men and 110 women) were included in the study. Highly elevated PSV were associated with very lower thyroid echogenicity and heterogeneous pattern thyroid gland (p= 0.01) and intrathyroidal blood flow (p= 0.004). Conclusions: We conclude that evaluation the vascularization patterns of the thyroid gland parenchyma in patients with HT when compared to conventional ultrasound mode B, and with the PSV of the inferior thyroid artery by pulsed Doppler showed a high correlation. Probably this method could be recommend as a measure of thyroid blood flow as an essential part of evaluating ultrasonography in the HT.</p>

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Yasuoka, Kenji, Kenji Harada, Tomomi Orino et Goro Takada. « Right Ventricular Diastolic Filling Assessed by Conventional Doppler and Tissue Doppler Imaging in Normal Children Normal Children. » Tohoku Journal of Experimental Medicine 189, n^o 4 (1999) : 283–94. http://dx.doi.org/10.1620/tjem.189.283.

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Fukae, Jun, Masato Shimizu, Yujiro Kon, Kazuhide Tanimura, Megumi Matsuhashi, Tamotsu Kamishima et Takao Koike. « Screening for rheumatoid arthritis with finger joint power Doppler ultrasonography : quantification of conventional power Doppler ultrasonographic scoring ». Modern Rheumatology 19, n^o 5 (octobre 2009) : 502–6. http://dx.doi.org/10.3109/s10165-009-0190-0.

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van der Ven, Myrthe, Jolanda J. Luime, Levinia L. van der Velden, Johan G. Bosch, Johanna M. W. Hazes et Hendrik J. Vos. « High-Frame-Rate Power Doppler Ultrasound Is More Sensitive than Conventional Power Doppler in Detecting Rheumatic Vascularisation ». Ultrasound in Medicine & ; Biology 43, n^o 9 (septembre 2017) : 1868–79. http://dx.doi.org/10.1016/j.ultrasmedbio.2017.04.027.

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ROJO, E., J. RODRIGO, L. PEREZDEISLA, C. ALMERIA, N. GONZALO, A. AUBELE, R. CINZA, J. ZAMORANO et C. MACAYA. « Disagreement between tissue Doppler imaging and conventional pulsed wave Doppler in the measurement of myocardial performance index ». European Journal of Echocardiography 7, n^o 5 (octobre 2006) : 356–64. http://dx.doi.org/10.1016/j.euje.2005.08.004.

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Schoenmaker, Nikki J., Irene M. Kuipers, Johanna H. van der Lee, Wilma F. Tromp, Maria van Dyck, Marc Gewillig, Nico A. Blom et Jaap W. Groothoff. « Diastolic dysfunction measured by tissue Doppler imaging in children with end-stage renal disease : a report of the RICH-Q study ». Cardiology in the Young 24, n^o 2 (5 mars 2013) : 236–44. http://dx.doi.org/10.1017/s1047951113000188.

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AbstractIntroduction:Early detection of cardiovascular disease in children with end-stage renal disease is essential in order to prevent cardiovascular morbidity and mortality in early adulthood. Tissue Doppler imaging has shown to be a promising method to detect and quantify subtle abnormalities in diastolic function. We therefore compared assessment of diastolic function by conventional echocardiography and tissue Doppler imaging.Methods:We performed conventional echocardiography and tissue Doppler imaging in 38 children with end-stage renal disease and 76 healthy controls. We compared outcomes on parameters related to diastolic function (E/a ratio for conventional echocardiography and E/E′ ratio for tissue Doppler imaging) for both groups using multiple linear regression analysis. Diastolic dysfunction was defined as E/a ratio <1 or E/E′ ratio > 95th percentile for age. To assess the intra-observer reproducibility, the coefficient of variation was calculated.Results: Children with end-stage renal disease had on average a lower E/a ratio (p = 0.004) and a higher mitral and septal E/E′ ratio (both p < 0.001) compared with controls. In all, two children with end-stage renal disease (5%) had diastolic dysfunction according to the E/a ratio, 11 according to the mitral E/E′ ratio (29%), and 16 according to the septal E/E′ ratio (42%) compared with none of the controls (p = 0.109, p < 0.001, and p < 0.001, respectively). The coefficients of variation of the mitral (7%) and septal E/E′ ratio (4%) were smaller than the coefficient of variation of the E/a ratio (11%).Conclusions:Tissue Doppler imaging is a more sensitive and reliable method to detect diastolic dysfunction than conventional E/a ratio in children with end-stage renal disease.

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Perren, Fabienne, Peter Horn, Peter Vajkoczy, Peter Schmiedek et Stephen Meairs. « Power Doppler imaging in detection of surgically induced indirect neoangiogenesis in adult moyamoya disease ». Journal of Neurosurgery 103, n^o 5 (novembre 2005) : 869–72. http://dx.doi.org/10.3171/jns.2005.103.5.0869.

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Object. Moyamoya is a rare, chronic disease that leads to the progressive narrowing and/or occlusion of the distal internal carotid and proximal cerebral arteries. Chronic cerebral ischemia ensues due to insufficient collateral blood supply. One potential treatment consists of the restoration of regional cerebral blood flow by direct or indirect revascularization surgery. The extent of neovascularization, especially in indirect procedures such as encephalomyosynangiosis (EMS), is currently evaluated with conventional angiography. Because this method is invasive and carries some risks, the authors investigated power Doppler imaging as an alternative noninvasive bedside procedure that can be used to assess surgically induced indirect revascularization in adult patients with moyamoya disease. Methods. Twelve symptomatic patients with adult moyamoya disease (seven women and five men, mean age 38 ± 17 years) underwent combined (direct and indirect) revascularization. They were then examined using conventional angiography and power Doppler imaging to assess the extent of revascularization within 120 days postsurgery. According to the number of intracranial vessels demonstrating opacification on conventional angiography and power Doppler imaging studies, EMS was graded as follows: 1, absent (0 vessels); 2, moderate (one—four vessels); and 3, extensive (> four vessels) for both methods. Examiners were blinded to the classification results for the procedure that they did not grade. All 24 hemispheres were examined. The visual grading of EMS revealed a highly significant agreement between conventional angiography and power Doppler imaging (Spearman rank coefficient, r = 0.92; p < 0.001) and there was 100% agreement of patency of the bypass between the direct and indirect methods. Conclusions. The authors found excellent agreement between the two methods. Therefore, power Doppler imaging is a valid noninvasive alternative to carotid artery angiography in evaluating direct and indirect revascularization.

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Wang, Fangjian, Steffen Krause, Joachim Hug et Christian Rembe. « A Contactless Laser Doppler Strain Sensor for Fatigue Testing with Resonance-Testing Machine ». Sensors 21, n^o 1 (5 janvier 2021) : 319. http://dx.doi.org/10.3390/s21010319.

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In this article, a non-contact laser Doppler strain sensor designed for fatigue testing with the resonance-testing machine is presented. The compact sensor measures in-plane displacements simultaneously from two adjacent points using the principle of in-plane, laser-Doppler vibrometry. The strain is computed from the relative displacements divided by the distance between these two points. The optical design, the mathematical model for estimating noise-limited resolution, the simulation results of this model, and the first measurement results are presented. The comparison of the measurement results of our sensor with the results of a conventional strain gauge shows that our design meets the measurement requirements. The maximum strain deviation compared to conventional strain gauges of the laser-Doppler extensometer is below 4×10−5 in all performed experiments.

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Mohd Basir, Shafinaz, Idnin Pasya, Tajmalludin Yaakob, Nur Emileen Abd Rashid et Takehiko Kobayashi. « Improvement of Doppler measurement using multiple-input multiple-output (MIMO) concept in radar-based automotive sensor detecting pedestrians ». Sensor Review 38, n^o 2 (19 mars 2018) : 239–47. http://dx.doi.org/10.1108/sr-04-2017-0060.

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Purpose This paper aims to present an approach of utilizing multiple-input multiple-output (MIMO) radar concept to enhance pedestrian classification in automotive sensors. In a practical environment, radar signals reflected from pedestrians and slow-moving vehicles are similar in terms of reflecting angle and Doppler returns, inducing difficulty for target discrimination. An efficient discrimination between the two targets depends on the ability of the sensor to extract unique characteristics from each target, for example, by exploiting Doppler signatures. This study describes the utilization of MIMO radar for Doppler measurement and demonstrates its application to improve pedestrian classification through actual laboratory measurements. Design/methodology/approach Multiple non-modulated sinusoidal signals are transmitted orthogonally over a MIMO array using time division scheme, illuminating human and non-human targets. The reflected signal entering each of the receiving antenna are combined at the radar receiver prior to Doppler processing. Doppler histogram was formulated based on a series of measurements, and the Doppler spread of the targets was determined from the histograms. Results were compared between MIMO and conventional single antenna systems. Findings Measurement results indicated that the MIMO configuration provides able to capture more Doppler information compared to conventional single antenna systems, enabling a more precise discrimination between pedestrian and other slow-moving objects on the road. Originality/value The study demonstrated the effectiveness of using MIMO configuration in radar-based automotive sensor to enhance the accuracy of Doppler estimation, which is seldom highlighted in literature of MIMO radars. The result also indicated its usefulness in improving target discrimination capability of the radar, through actual measurement.

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Kamel, Ashraf, Sara AboElnour, Mohamed El-Gamasy et Marwa Ragaey. « Conventional Echocardiography Versus Tissue Doppler in Children with Primary Nephrotic Syndrome. » GEGET 16, n^o 2 (31 décembre 2021) : 40–52. http://dx.doi.org/10.21608/geget.2021.216777.

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Chin, Seung Bum, Shin Ho Kook, Young Rae Lee, Hae Won Park, Yoon Ok Park, Jong Wook Kim, Young Uk Lee, Won Kil Pae, Yong Lai Park et Myung Sook Kim. « Solid Breast Lesions : Evaluation with Power versus Conventional Color Doppler Sonography ». Journal of the Korean Radiological Society 39, n^o 5 (1998) : 1015. http://dx.doi.org/10.3348/jkrs.1998.39.5.1015.

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Platt, J. F., J. M. Rubin et J. H. Ellis. « Acute renal obstruction : evaluation with intrarenal duplex Doppler and conventional US. » Radiology 186, n^o 3 (mars 1993) : 685–88. http://dx.doi.org/10.1148/radiology.186.3.8430174.

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Mitchell, D. G., L. Needleman, M. Bezzi, B. B. Goldberg, A. B. Kurtz, R. G. Pennell, M. D. Rifkin, M. Vilaro et O. H. Baltarowich. « Femoral artery pseudoaneurysm : diagnosis with conventional duplex and color Doppler US. » Radiology 165, n^o 3 (décembre 1987) : 687–90. http://dx.doi.org/10.1148/radiology.165.3.3317501.

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Tempe, A., S. Singh, L. Wadhwa et A. Garg. « Conventional and color Doppler sonography in preoperative assessment of ovarian tumors ». International Journal of Gynecology & ; Obstetrics 92, n^o 1 (21 novembre 2005) : 64–68. http://dx.doi.org/10.1016/j.ijgo.2005.09.025.

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Perren, Fabienne, Peter Horn, Rolf Kern, Eva Bueltmann, Michael Hennerici et Stephen Meairs. « A rapid noninvasive method to visualize ruptured aneurysms in the emergency room : three-dimensional power Doppler imaging ». Journal of Neurosurgery 100, n^o 4 (avril 2004) : 619–22. http://dx.doi.org/10.3171/jns.2004.100.4.0619.

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Object. Three-dimensional (3D) power Doppler ultrasonography imaging provides a rapid, noninvasive visualization of ruptured intracranial aneurysms, including their relationship to other vascular structures. Methods. The authors used transcranial 3D power Doppler imaging in the emergency room to examine patients with acute subarachnoid hemorrhage. In all patients, the ruptured aneurysm was rapidly located with 3D power Doppler imaging. Conventional x-ray angiography confirmed both the ultrasonography-based diagnosis and the location of aneurysmal bleeding. Conclusions. These preliminary results indicate that 3D power Doppler imaging is a rapid, noninvasive screening method for the visualization of ruptured aneurysms.

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