Bibliographies thématiques / Color Flow Mapping (CFM)

Littérature scientifique sur le sujet « Color Flow Mapping (CFM) »

Auteur : Grafiati
Publié le 10 mars 2023

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Articles de revues sur le sujet "Color Flow Mapping (CFM)"

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Vixège, Florian, Alain Berod, Yunyun Sun, Simon Mendez, Olivier Bernard, Nicolas Ducros, Pierre-Yves Courand, Franck Nicoud et Damien Garcia. « Physics-constrained intraventricular vector flow mapping by color Doppler ». Physics in Medicine & ; Biology 66, no 24 (16 décembre 2021) : 245019. http://dx.doi.org/10.1088/1361-6560/ac3ffe.

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Abstract Color Doppler by transthoracic echocardiography creates two-dimensional fan-shaped maps of blood velocities in the cardiac cavities. It is a one-component velocimetric technique since it only returns the velocity components parallel to the ultrasound beams. Intraventricular vector flow mapping (iVFM) is a method to recover the blood velocity vectors from the Doppler scalar fields in an echocardiographic three-chamber view. We improved our iVFM numerical scheme by imposing physical constraints. The iVFM consisted in minimizing regularized Doppler residuals subject to the condition that two fluid-dynamics constraints were satisfied, namely planar mass conservation, and free-slip boundary conditions. The optimization problem was solved by using the Lagrange multiplier method. A finite-difference discretization of the optimization problem, written in the polar coordinate system centered on the cardiac ultrasound probe, led to a sparse linear system. The single regularization parameter was determined automatically for non-supervision considerations. The physics-constrained method was validated using realistic intracardiac flow data from a patient-specific computational fluid dynamics (CFD) model. The numerical evaluations showed that the iVFM-derived velocity vectors were in very good agreement with the CFD-based original velocities, with relative errors ranged between 0.3% and 12%. We calculated two macroscopic measures of flow in the cardiac region of interest, the mean vorticity and mean stream function, and observed an excellent concordance between physics-constrained iVFM and CFD. The capability of physics-constrained iVFM was finally tested with in vivo color Doppler data acquired in patients routinely examined in the echocardiographic laboratory. The vortex that forms during the rapid filling was deciphered. The physics-constrained iVFM algorithm is ready for pilot clinical studies and is expected to have a significant clinical impact on the assessment of diastolic function.
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Brands, Peter J., Arnold P. G. Hoeks et Léon A. F. Ledoux. « A Single Bit RF Domain Complex Cross-Correlation Velocity Estimator for Color Flow Mapping ». Ultrasonic Imaging 19, no 3 (juillet 1997) : 180–94. http://dx.doi.org/10.1177/016173469701900302.

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This paper evaluates the performance of a one bit mean frequency estimator to estimate blood flow velocity for ultrasound color flow mapping. This one bit mean frequency estimator, referred to as BC3 estimator, is derived from the recently introduced complex cross-correlation model (C3M) employing the full dynamic data range. The C3M velocity estimator is not suitable for application in color flow mapping because of its high hardware complexity and associated computational load. The BC3 estimator estimates the mean blood flow velocity using only two complex cross-correlation coefficients. For this purpose the latter are computed by means of a complex one bit cross-correlation operation. Each sample of the RF signals is converted into an one bit representation based on the sign of the real and imaginary part of the RF samples. A full derivation and mathematical description of the BC3 estimator is presented. In addition, a thorough performance evaluation of the BC3 estimator in comparison with the full dynamic range C3M velocity estimator is carried out by means of signal simulations to document the effect of signal to noise ratio, sample frequency and bandwidth. For the specific simulation conditions considered the standard deviation of both estimators (C3M and BC3) is comparable. The bias of the BC3 estimator appears to be a function of velocity, while the full dynamic range C3M velocity estimator exhibits no bias. The simulation results are confirmed by evaluation of data from an in vivo measurement. Taking into account the low hardware complexity and computational load in combination with the achieved precision, it may be concluded that the BC3 estimator is well suited for implementation in color flow mapping.
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Vixège, Florian, Alain Berod, Pierre-Yves Courand, Simon Mendez, Franck Nicoud, Philippe Blanc-Benon, Didier Vray et Damien Garcia. « Full-volume three-component intraventricular vector flow mapping by triplane color Doppler ». Physics in Medicine & ; Biology 67, no 9 (19 avril 2022) : 095004. http://dx.doi.org/10.1088/1361-6560/ac62fe.

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Abstract Objective. Intraventricular vector flow mapping (iVFM) is a velocimetric technique for retrieving two-dimensional velocity vector fields of blood flow in the left ventricular cavity. This method is based on conventional color Doppler imaging, which makes iVFM compatible with the clinical setting. We have generalized the iVFM for a three-dimensional reconstruction (3D-iVFM). Approach. 3D-iVFM is able to recover three-component velocity vector fields in a full intraventricular volume by using a clinical echocardiographic triplane mode. The 3D-iVFM problem was written in the spherical (radial, polar, azimuthal) coordinate system associated to the six half-planes produced by the triplane mode. As with the 2D version, the method is based on the mass conservation, and free-slip boundary conditions on the endocardial wall. These mechanical constraints were imposed in a least-squares minimization problem that was solved through the method of Lagrange multipliers. We validated 3D-iVFM in silico in a patient-specific CFD (computational fluid dynamics) model of cardiac flow and tested its clinical feasibility in vivo in patients and in one volunteer. Main results. The radial and polar components of the velocity were recovered satisfactorily in the CFD setup (correlation coefficients, r = 0.99 and 0.78). The azimuthal components were estimated with larger errors ( r = 0.57) as only six samples were available in this direction. In both in silico and in vivo investigations, the dynamics of the intraventricular vortex that forms during diastole was deciphered by 3D-iVFM. In particular, the CFD results showed that the mean vorticity can be estimated accurately by 3D-iVFM. Significance. Our results tend to indicate that 3D-iVFM could provide full-volume echocardiographic information on left intraventricular hemodynamics from the clinical modality of triplane color Doppler.
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Tantipalakorn, Charuwan, Dangcheewan Tinnangwattana, Thitikarn Lerthiranwong, Suchaya Luewan et Theera Tongsong. « Comparisons of Effectiveness in Differentiating Benign from Malignant Ovarian Masses between Conventional and Modified Risk of Malignancy Index (RMI) ». International Journal of Environmental Research and Public Health 20, no 1 (3 janvier 2023) : 888. http://dx.doi.org/10.3390/ijerph20010888.

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Objective: To compare the predictive performance in differentiating benign from malignant ovarian masses between the modified risk malignancy index (RMI) and the conventional RMI (RMI-1 and RMI-2). Methods: Women scheduled for elective surgery because of adnexal masses were recruited to undergo pelvic sonography within 24 h before surgery to assess the sonographic characteristics of the masses, focusing on loculi, solid part, ascites, bilateralness, papillary projection, and color flow mapping (CFM). Preoperative CA-125 levels were also measured. Modified RMI, RMI-1, and RMI-2 systems were used to predict malignant masses. The gold standard was pathological or intraoperative diagnosis. Results: A total of 342 ovarian masses, benign: 243 (71.1%); malignant: 99 (28.9%), meeting the inclusion criteria were analyzed. The sensitivity and the specificity of the modified RMI (87.9% and 81.9%) were significantly higher than those of RMI-1 (74.7% and 84.4%), and RMI-2 (79.8% and 81.1%, respectively). Based on ROC curves, the area under the curves were 0.930, 0.881 and 0.882 for modified RMI, RMI-1 and RMI-2, respectively. Conclusion: Modified RMI had better predictive performance than the conventional RMI in differentiating between benign and malignant ovarian masses. Modified RMI may be useful to help general gynecologists or practitioners to triage patients with an adnexal mass, especially in settings of low resources.
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Wellert, S. R., S. E. Battista, J. Kieffer, R. N. Lurch et A. Garcia-Guerra. « 168 Comparison of different Doppler ultrasound settings for pregnancy diagnosis based on corpus luteum perfusion at 21 days after AI in beef cattle ». Reproduction, Fertility and Development 32, no 2 (2020) : 211. http://dx.doi.org/10.1071/rdv32n2ab168.

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Colour Doppler ultrasonography of the corpus luteum (CL) can be used for early pregnancy diagnosis to improve reproductive efficiency and increase the use of AI in beef cattle. The objective of the present study was to determine the diagnostic performance of different Doppler ultrasonography settings for pregnancy diagnosis based on CL perfusion at 21 days after fixed-time AI in beef heifers and cows. Yearling Angus-cross heifers (n=25) and suckled Angus-cross cows (n=84) aged 2-13 years were submitted to a 5-day CO-Synch + controlled internal drug release (CIDR) and timed AI at 60 or 72h after CIDR removal for heifers and cows, respectively. Animals were evaluated by a single operator using colour Doppler ultrasonography (Esaote MyLab Delta) at Day 21. Three settings for colour flow mapping (720, 960, and 1500Hz) and one setting for power Doppler (960Hz), which differed in pulse repetition frequency, were evaluated. The other settings remained unchanged with a probe frequency of 6.3MHz, wall filter of 3, and gain of 61. The pregnancy status (pregnant or non-pregnant) of cows and heifers was determined at 21 days following insemination using colour Doppler ultrasonography. Cows and heifers were considered to be pregnant if the CL blood flow area covered >10% of the periphery of the CL and contained at least two colour internal tracts penetrating towards the centre of the CL. Cattle were evaluated using transrectal B-mode ultrasonography on Day 35 to determine actual pregnancy status. Differences between diagnostic performance variables were evaluated using logistic regression, and setting, category (heifer or cow), and the interaction were included as fixed effects. Pregnancies per AI at Day 35 after fixed-time AI were 47.7% (52/109). Sensitivity, specificity, positive predictive value (PPV), and negative predictive value (NPV) for pregnancy diagnosis at Day 21 for each setting are included in Table 1. There were no differences in sensitivity and NPV between settings (P>0.9), category (P>0.9), or the interaction (P>0.9). There was no effect of setting (P>0.5) or category×setting interaction (P>0.8) on specificity and PPV. There was, however, an effect of category (P<0.01). Colour Doppler ultrasonography had less specificity (59.1% compared with 90.2%) and PPV (75% compared with 89.3%) in heifers than in cows. In conclusion, colour Doppler ultrasonography settings that were evaluated did not affect the diagnostic performance for pregnancy diagnosis at Day 21 after AI, although, numerically the colour flow mapping at 960Hz appears to maximise diagnostic accuracy. In addition, the false-positive rate was greater in heifers, which warrants further research. Table 1.Sensitivity, specificity, positive predictive value (PPV), and negative predictive value (NPV) for pregnancy diagnosis for four colour Doppler ultrasound settings (colour flow mapping (CFM) at 720, 960, and 1500Hz and power Doppler (PWD) at 960Hz) at 21 days after fixed-time AI Item CFM720 CFM960 CFM1500 PWD960 Sensitivity,% 100 100 92.3 100 Specificity,% 80.7 87.7 87.7 80.7 PPV,% 82.5 88.1 87.3 82.5 NPV,% 100 100 92.6 100
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Kruse, D., et K. Ferrara. « Color flow mapping ». Ultrasound in Medicine & ; Biology 26 (mai 2000) : S16—S18. http://dx.doi.org/10.1016/s0301-5629(00)00154-x.

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Ferrara, Katherine, et Gia DeAngelis. « Color flow mapping ». Ultrasound in Medicine & ; Biology 23, no 3 (janvier 1997) : 321–45. http://dx.doi.org/10.1016/s0301-5629(96)00216-5.

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Chapanova, E. M., M. A. Ikonnikova, G. G. Ikonnikov, S. N. Ermolev, O. O. Yanushevich, I. O. Merzhoev, A. N. Khitrov et al. « Assessment of the temporomandibular joint condition using two-dimensional ultrasound scanning and doppler ultrasonography methods in patients with chronic inflammatory periodontal diseases ». Meditsinskiy sovet = Medical Council, no 21-2 (9 janvier 2022) : 118–23. http://dx.doi.org/10.21518/2079-701x-2021-21-2-118-123.

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Introduction. Currently, dentists are increasingly detecting changes in the temporomandibular joint in patients with chronic inflammatory periodontal disease.Aim of the study. To carry out a comprehensive dynamic assessment of the temporomandibular joint (TMJ) condition and the registration of regional blood flow using two-dimensional ultrasound scanning to improve the efficiency of diagnostics of inflammatory periodontal diseases.Materials and methods. The study included 2 groups of patients: group 1 (control) consisted of 20 volunteers aged 20–25; Group 2 consisted of 52 people aged 25–45 years with moderate chronic periodontitis. For TMJ ultrasound and Doppler ultrasound, a portable ultrasound scanner LogicScan 128 with an HL-10 linear ultrasound transducer with an operating frequency of 5 to 12 MHz was used.Results and discussion. During ultrasound examination of the temporomandibular joint and measuring the size of the joint space in patients with moderate chronic periodontitis in a state of relative physiological rest, the following values were obtained: in the anterior region – 2.3 ± 0.5 mm; in the upper section – 1.6 ± 0.6 mm; in the posterior section – 1.8 ± 0.3 mm. We also measured the area of the temporomandibular joint disc in various positions. According to ultrasound data, an increase in the size of the joint space from 12.2 to 16.1% and an increase in the area of the articular disc by 17.1 to 36.7% were found in patients with chronic periodontitis. When assessing the trajectory of the articular track, motion delay and joint wedging are determined. In addition, in the color Doppler mapping (CDM) mode, the speed and index indicators of Doppler ultrasonography of the external carotid and temporal arteries were calculated.Conclusions. Modern diagnostic methods of ultrasound and Doppler mapping, assessing the hemodynamics and functional state of the TMJ, allow early diagnosis of changes in order to prevent the development of TMJ disorders in patients with chronic inflammatory periodontal diseases.
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Switzer, Donald F., et Navin C. Nanda. « Doppler color flow mapping ». Ultrasound in Medicine & ; Biology 11, no 3 (mai 1985) : 403–16. http://dx.doi.org/10.1016/0301-5629(85)90151-6.

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Tuchkina, I. O., S. V. Kiebashvili, O. V. Piontkovska et N. V. Romanova. « Clinical-ultrasound and clinical-morphological characteristics of adnexal torsion in girls and adolescents ». Medicine Today and Tomorrow 90, no 1 (31 mars 2021) : 81–87. http://dx.doi.org/10.35339/msz.2021.90.01.08.

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Clinical-ultrasound and clinical-morphological characteristics of adnexal torsion to the improvement of early diagnosis and development of optimal ways of organ-preserving surgical tactics of treatment have been determined. An analysis was carried out of 71 patients with adnexal torsion (group 1– 30 girls of 2–12 years, group 2 – 41 adolescents of 13–17 years). The main clinical signs of adnexal torsion were nonspecific and similar to the well-known clinic of acute abdomen. Ultrasound examination with color doppler mapping (CDM) allowed to suspect adnexal torsion in 44 (62 %) patients. The main echographic features of adnexal torsion were: ovarian enlargement, non-typical location and a change in the structure of ovary, the presence of a free liquid in the cavity of a small pelvis or in the abdominal cavity, «a symptom of springs» (a twisted vascular leg), a decrease or absence of blood flow in CDM. The torsion of intact uterine appendages is installed in 29 patients (twice as often in group 1). In 42 cases were detected the torsion of the uterine appendages, compromised by the presence of tumors and tumor-like formations (twice as often in group 2). In both groups, 36 (50.7 %) organ-preserving and 35 (49.3 %) radical operations were carried out. According to the results of morphological examination of the removed tissues, the following data were obtained: follicular cysts – 15, paratubal cysts – 8, corpus luteum cysts – 8, teratomas – 5, serous cystadenomas – 2, mucinous cystadenoma – 1, paraovarian cysts – 3. Differential diagnosis of adnexal torsion in girls and adolescents should include a thorough collection of anamnestic data, taking into account the features of the clinical course of the disease, the results of a comprehensive examination with an assessment of ultrasound data from CDM, computer and magnetic resonance imaging, which will contribute to the advanced adequate selection of tactics of urgent gynecological intervention. The method of choice for the treatment of adnexal torsion is a minimally invasive surgical intervention – a laparoscopy with organ-preserving operations. Keywords: adnexal torsion, girls, ultrasound and morphological characteristics.
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Thèses sur le sujet "Color Flow Mapping (CFM)"

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Giangrossi, Claudio. « Development and real-time implementation of novel 2-D and 3-D imaging techniques on a research scanner ». Doctoral thesis, 2022. http://hdl.handle.net/2158/1272194.

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In the last decades, ultrasound imaging systems have become more and more popular thanks to their capability to investigate tissues in safe, cost effective, and non-invasive way. Their role in diagnostic imaging has become fundamental in several medical specialties, thanks also to the introduction of advanced echographic systems fostered by the efforts of several research laboratories around the world. Such efforts are more frequently based on the use of special research scanners, characterized by flexible hardware and programmable software and firmware. These features have been demonstrated ideal for the implementation and test of new methods, such as high frame-rate (HFR) imaging, color flow imaging (CFI), vector Doppler imaging, and 3 D imaging. Especially HFR and 3 D imaging have recently attracted great interest, but they are technically demanding since they involve either the formation of thousands of images per second, or the use of 2-D probes having a large number of elements. Therefore, great challenges must be faced for effective real-time implementation of 3 D and HFR imaging methods. My PhD activity aimed to implement and test advanced 2 D and 3 D ultrasound imaging modalities on an open research scanner called ULA OP 256. In the first part of my work, a new ultrasound imaging modality called Virtual real-time (VRT) was introduced through the modification of the firmware and software of the research scanner ULA-OP 256. With this modality, during a real-time (RT) investigation, the scanner initially acquires and stores in its memory up to 20 s of raw echo data. On user demand, the scanner can be switched to VRT mode: the stored data are re processed by the same resources used in RT but at different (typically lower) rates and, possibly, with different processing algorithms and parameters. In this way, contingent difficulties of image interpretation (especially in presence of rapidly moving phenomena), or possible computational limitations imposed by hardware during continuous RT processing can be overcome. The VRT modality has been demonstrated useful in different applications, for example, to implement a high-PRF version of the Multiline vector Doppler (MLVD) method, and a High- rame-rate CFI method, characterized by enhanced temporal and spatial resolution. The second part of my work included the software upgrade of ULA OP 256; it enabled the use of 2 D probes and the implementation of 3 D scanning methods. The ULA OP 256 can now be coupled to 2 D probes with arbitrary geometries, including matrix and sparse arrays. Furthermore, the scanner is now capable of simultaneously imaging multiple planes with programmable rotational angles. Novel approaches based on a sparse spiral array probe have been implemented and tested for different applications. For example, bi-plane imaging was evaluated for robust flow mediated dilation exams. Real-time 3 D spectral Doppler analysis was also performed. Here, two planes with programmable rotational angles were scanned to produce corresponding B-Mode images, over which multiple Doppler lines could be arbitrarily set to obtain the relative Multigate spectral Doppler (MSD) profiles. Finally, the last part of my work was specifically dedicated to the technical problems involved by HFR 3 D imaging. The management of (several) hundreds of transducer elements of a 2 D probe yields a huge amount of echo data: this makes complex and computationally expensive the processing of data volumes including thousands of lines, especially if performed at HFR. As a case report, the requirements of the main processing stages involved in ULA OP 256 receiver have been thoroughly investigated to detect and, possibly, solve the main bottlenecks. The study has evidenced that the star architecture that digitally interconnects the eight front-end boards of ULA OP 256 may frequently encounter data transfer bandwidth saturation that limits the overall performance in terms of frame/volume rate. A new architecture for data transfer has been proposed and shown effective to reduce the bandwidth requirements and thus, increase the performance of the scanner.
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Lin, Shu-Chuen, et 林樹淳. « The study of time distortion correction techniques for color doppler flow mapping ». Thesis, 1995. http://ndltd.ncl.edu.tw/handle/22348867946451466577.

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Livres sur le sujet "Color Flow Mapping (CFM)"

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Color Flow Mapping : A Visual Text of Congenital and Acquired Hear Ritter. Lippincott Williams & Wilkins,US, 1991.

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Chapitres de livres sur le sujet "Color Flow Mapping (CFM)"

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Iwase, Masatsugu, et Iwao Sotobata. « Color coded Doppler flow mapping ». Dans Clinical Echocardiography, 250–81. Dordrecht : Springer Netherlands, 1989. http://dx.doi.org/10.1007/978-94-009-0867-3_11.

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Mcnamara, Brian R. « Color Mapping Cluster Cooling Flow Galaxies ». Dans The Stellar Populations of Galaxies, 456. Dordrecht : Springer Netherlands, 1992. http://dx.doi.org/10.1007/978-94-011-2434-8_123.

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Maulik, Dev. « Sonographic Color Flow Mapping : Basic Principles ». Dans Doppler Ultrasound in Obstetrics & ; Gynecology, 68–87. Berlin, Heidelberg : Springer Berlin Heidelberg, 1997. http://dx.doi.org/10.1007/978-3-642-86441-4_5.

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Yock, Paul G., Ingela Schnittger et Richard L. Popp. « Two-dimensional Doppler flow mapping in adult cardiology : advantages and limitations ». Dans Color Doppler Flow Imaging, 69–82. Dordrecht : Springer Netherlands, 1986. http://dx.doi.org/10.1007/978-94-009-4283-7_6.

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de Bruijn, Norbert P., Fiona M. Clements et Joseph A. Kisslo. « Transesophageal Doppler color flow mapping : initial experience ». Dans Developments in Cardiovascular Medicine, 291–97. Dordrecht : Springer Netherlands, 1989. http://dx.doi.org/10.1007/978-94-009-0907-6_22.

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Kyo, Shunei, Shinichi Takamoto, Eiko Takanawa, Makoto Matsumura, Yuji Yokote et Ryozo Omoto. « Does color flow mapping Doppler echocardiography allow the catheterization laboratory to be bypassed in surgery of congenital heart disease ? » Dans Color Doppler Flow Imaging, 107–21. Dordrecht : Springer Netherlands, 1986. http://dx.doi.org/10.1007/978-94-009-4283-7_8.

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Ferrara, Katherine, et V. Ralph Algazi. « Comparison of Estimation Strategies for Color Flow Mapping ». Dans Acoustical Imaging, 317–22. Boston, MA : Springer US, 1992. http://dx.doi.org/10.1007/978-1-4615-3370-2_50.

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Yatchenko, Artem, et Andrey Krylov. « Iterative Phase Unwrapping in Color Doppler Flow Mapping ». Dans Intelligent Science and Intelligent Data Engineering, 330–38. Berlin, Heidelberg : Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-36669-7_41.

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Fripp, Raymond R. « UNM Experience with Color Doppler Flow Mapping in Fetal Echocardiography ». Dans Biochemical Monitoring of the Fetus, 72–75. New York, NY : Springer New York, 1993. http://dx.doi.org/10.1007/978-1-4757-2259-8_11.

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Chatterjee, Molly S. « Importance of Pulsed Doppler and Color Flow Mapping in Diabetic Pregnancies ». Dans Biochemical Monitoring of the Fetus, 41–44. New York, NY : Springer New York, 1993. http://dx.doi.org/10.1007/978-1-4757-2259-8_6.

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Actes de conférences sur le sujet "Color Flow Mapping (CFM)"

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Bonnefous, O., P. Pesque et X. Bernard. « A New Velocity Estimator for Color Flow Mapping ». Dans IEEE 1986 Ultrasonics Symposium. IEEE, 1986. http://dx.doi.org/10.1109/ultsym.1986.198856.

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Herment, Demoment, Pellot, Dumee et Peronneau. « An Efficient Algorithm for Real Time Adaptive Color Flow Mapping ». Dans Proceedings of the Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE, 1992. http://dx.doi.org/10.1109/iembs.1992.590491.

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Herment, Alain, Guy Demoment, Claire Pellot, Philippe Dumee et Pierre Peronneau. « An efficient algorithm for real time adaptive color flow mapping ». Dans 1992 14th Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE, 1992. http://dx.doi.org/10.1109/iembs.1992.5762194.

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Li, Ye, Peter Moller Hansen, Martin Christian Hemmsen, Michael Bachmann Nielsen et Jorgen Arendt Jensen. « In vivo color flow mapping using synthetic aperture dual stage beamforming ». Dans 2012 IEEE International Ultrasonics Symposium. IEEE, 2012. http://dx.doi.org/10.1109/ultsym.2012.0398.

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Zhang, Qinghui, Yufeng Zhang, Yi Zhou et Lian Gao. « The effect of the vessel wall motion on color flow mapping images ». Dans 2016 5th International Conference on Measurement, Instrumentation and Automation (ICMIA 2016). Paris, France : Atlantis Press, 2016. http://dx.doi.org/10.2991/icmia-16.2016.64.

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Jamal, Arshad, et K. S. Venkatesh. « A New Color Based Optical Flow Algorithm for Environment Mapping Using a Mobile Robot ». Dans 2007 IEEE 22nd International Symposium on Intelligent Control. IEEE, 2007. http://dx.doi.org/10.1109/isic.2007.4450948.

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Kimura, Masashi, Gakuto Masuyama et Kazunori Umeda. « Three-dimensional mapping by direct estimation of a small motion using range images and optical flow of color images ». Dans 2016 IEEE/SICE International Symposium on System Integration (SII). IEEE, 2016. http://dx.doi.org/10.1109/sii.2016.7844090.

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Menon, Rajan K. « Three Component Velocity Measurements in the Interblade Region of a Fan ». Dans ASME 1987 International Gas Turbine Conference and Exhibition. American Society of Mechanical Engineers, 1987. http://dx.doi.org/10.1115/87-gt-207.

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Optimizing aerodynamics and improving blade designs to make efficient power-generating machinery requires a good understanding of the rotor flow field. Swirl, flow instabilities, and high turbulence highlight the need for understanding the three-dimensional nature of the flow. Dynamic interaction between fluid and structural aspects in fluid machinery, impact of unsteady flows or loads, and enhancement of property transport can be studied through simultaneous measurement of three components of velocity. A three color, three component Laser Velocimeter System is used to simultaneously measure the three orthogonal components of velocity in the interblade region of a fan. The non-invasive nature of the technique combined with the very small measuring volume of the system provides detailed mapping of the flow field in the interblade region. The data acquisition package collects all the data available while the machine is running and sorts the raw data into bins corresponding to the various circumferential positions. Each velocity measurement — all three components — along with the circumferential position information is collected by a DEC PDP 11/23 Computer. The analysis package allows the user to examine a portion of the interblade region, look at alternate interblade gaps, omit data during blade passage, etc. Statistical properties such as mean, turbulence, skewness, flatness, Reynolds stress values, and projections in cross sectional planes are obtained and displayed as a function of circumferential position. Thus, the detailed properties of the three dimensional flow field are obtained from the three component LDV measurements.
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Azwar, Olivia, Dian Permanasari, Nadia Ardikani, Nabilah Adani, Didit Kusuma, Budi Abrar, Taufik Nordin et al. « Integration of High-Definition Karst Mapping and Quantitative Porosity Analysis from Borehole Image to Improve Well Placement in Complex Carbonate Reservoir of East Java Basin ». Dans ADIPEC. SPE, 2022. http://dx.doi.org/10.2118/211708-ms.

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Abstract The CD Carbonate in X-Field, East Java Basin has multiple reservoir targets with varying flow units, predominantly because of secondary porosity development from karst processes. Each of these reservoirs are relatively thin and the continuity of the karst within the reservoir is random. The amount of producible hydrocarbon will rest on the length of the drain section along the reservoir and the amount of karst intersected by the trajectory. Thus, maintaining the trajectory inside the carbonate reservoir while targeting the karst position is important for productivity. To maintain the production in the field, a new platform was built to the southeast of the first platform, aiming for a new development area. Five horizontal wells were planned as part of the second development phase. The first horizontal well is the most challenging one because of the high uncertainty of the structural dips along the lateral length triggered by the low seismic resolution and the limited nearby offset wells for control points. Moreover, the offset wells show inconsistent log properties that complicate the correlation to land into the targeted karst level within the reservoir. Initially, a pilot hole was planned to reduce the landing uncertainties; however, it was being challenged for cost efficiency. Therefore, a well placement strategy was proposed instead, including landing and geosteering using a new logging-while-drilling (LWD) combination of advanced high-definition reservoir mapping technology, high-resolution laterolog borehole imaging technology, and a multifunction LWD tool. In this paper we demonstrate the complete preparation of the well placement project, strategy, and evaluation using this new LWD combination for better interpretation of the reservoir. The deeper reading and higher resolution of the new reservoir mapping technology have permitted continuous mapping of the target reservoir, which typically has 35- to 50-ft thickness, to reduce the structural uncertainties from seismic. For the first time, it successfully revealed the karst network within the reservoir with greater details, identified by a blue-vein color spectrum of the resistivity inversion caused by seawater invasion or clay-filled karst. This high-definition karst mapping has helped to land the well precisely at the target karst sweet spot, improving the understanding of the karst characters along the trajectory, and providing higher confidence in the real-time geosteering decision. The high-resolution borehole image revealed the carbonate rock texture and karst/vugs appearance on a smaller scale, which was used to analyze the secondary porosity distribution and contribution along the trajectory using a quantitative image-based porosity analysis method. By integrating the high-definition reservoir mapping inversion interpretation and porosity analysis from a high-resolution borehole image, we were able to bridge the gap from seismic to reservoir scale, and finally to link the karst scale down to the vug pore sizes, for a better geological understanding and an improved geosteering strategy in the field.
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Jiang, Long, Shikui Chen et Xianfeng David Gu. « Generative Design of Multi-Material Hierarchical Structures via Concurrent Topology Optimization and Conformal Geometry Method ». Dans ASME 2019 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/detc2019-97617.

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Abstract Topology optimization has been proved to be an automatic, efficient and powerful tool for structural designs. In recent years, the focus of structural topology optimization has evolved from mono-scale, single material structural designs to hierarchical multimaterial structural designs. In this research, the multi-material structural design is carried out in a concurrent parametric level set framework so that the structural topologies in the macroscale and the corresponding material properties in mesoscale can be optimized simultaneously. The constructed cardinal basis function (CBF) is utilized to parameterize the level set function. With CBF, the upper and lower bounds of the design variables can be identified explicitly, compared with the trial and error approach when the radial basis function (RBF) is used. In the macroscale, the ‘color’ level set is employed to model the multiple material phases, where different materials are represented using combined level set functions like mixing colors from primary colors. At the end of this optimization, the optimal material properties for different constructing materials will be identified. By using those optimal values as targets, a second structural topology optimization is carried out to determine the exact mesoscale metamaterial structural layout. In both the macroscale and the mesoscale structural topology optimization, an energy functional is utilized to regularize the level set function to be a distance-regularized level set function, where the level set function is maintained as a signed distance function along the design boundary and kept flat elsewhere. The signed distance slopes can ensure a steady and accurate material property interpolation from the level set model to the physical model. The flat surfaces can make it easier for the level set function to penetrate its zero level to create new holes. After obtaining both the macroscale structural layouts and the mesoscale metamaterial layouts, the hierarchical multimaterial structure is finalized via a local-shape-preserving conformal mapping to preserve the designed material properties. Unlike the conventional conformal mapping using the Ricci flow method where only four control points are utilized, in this research, a multi-control-point conformal mapping is utilized to be more flexible and adaptive in handling complex geometries. The conformally mapped multi-material hierarchical structure models can be directly used for additive manufacturing, concluding the entire process of designing, mapping, and manufacturing.
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