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Relevant bibliographies by topics / CT-sign

Academic literature on the topic 'CT-sign'

Author: Grafiati

Published: 30 May 2022

Last updated: 31 May 2022

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Dissertations / Theses
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Journal articles on the topic "CT-sign"

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Maldonado, Roberto L. "The CT Angiogram Sign." Radiology 210, no. 2 (February 1999): 323–24. http://dx.doi.org/10.1148/radiology.210.2.r99fe14323.

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Rexroad, Jason T. "The CT Arrowhead Sign." Radiology 227, no. 1 (April 2003): 44–45. http://dx.doi.org/10.1148/radiol.2271020086.

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Pinto, Pedro S. "The CT Halo Sign." Radiology 230, no. 1 (January 2004): 109–10. http://dx.doi.org/10.1148/radiol.2301020649.

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Bugnicourt, Jean-Marc, Pauline Monet-Desblache, Hervé Deramond, and Olivier Godefroy. "The “carotid CT crescent” sign." Clinical Neurology and Neurosurgery 114, no. 6 (July 2012): 803–5. http://dx.doi.org/10.1016/j.clineuro.2011.12.047.

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Han, Jason, Hao Xiang, William E. Ridley, and Lloyd J. Ridley. "Atoll sign: High resolution CT." Journal of Medical Imaging and Radiation Oncology 62 (October 2018): 17. http://dx.doi.org/10.1111/1754-9485.05_12785.

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Tack, D., P. Defrance, C. Delcour, and P. A. Gevenois. "The CT fallen-lung sign." European Radiology 10, no. 5 (April 26, 2000): 719–21. http://dx.doi.org/10.1007/s003300050992.

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Fairbairn, K. J., M. E. Mulligan, M. D. Murphey, and C. S. Resnik. "CT bubble sign: A sign of recent hip dislocation." Clinical Radiology 49, no. 10 (October 1994): 752. http://dx.doi.org/10.1016/s0009-9260(05)82761-8.

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Jung, Sung Il, Hee Sun Park, Hae Jeong Jeon, Mi Hye Yu, Young Jun Kim, Jieun Chung, and Kyungah Jeong. "Whirlpool sign of adnexal torsion on CT: where can we find it?" Acta Radiologica 61, no. 5 (September 30, 2019): 714–20. http://dx.doi.org/10.1177/0284185119877336.

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Background Whirlpool sign on computed tomography (CT) is pathognomic of adnexal torsion. Purpose To evaluate the visibility and common location of the whirlpool sign in adnexal torsion on CT. Material and Methods This retrospective study included 143 consecutive patients who underwent preoperative CT imaging and subsequent surgically confirmed as adnexal torsion. Two readers independently recorded the presence and location of whirlpool sign in adnexal torsion on CT. Patients with and without whirlpool sign were compared with regard to the size of the adnexal mass and the degree of torsion. Results Whirlpool sign was detected in 60 (42.0%) patients on the transverse CT plane and 79 (55.2%) patients on the coronal CT plane of 143 patients. The sign was significantly better detected on the coronal CT plane than on the transverse CT plane ( P = 0.03). The most common location of the sign included the posterolateral aspect of the adnexal mass on the transverse CT plane (25/60, 41.7%, P = 0.04) and the upper-lateral aspect of the adnexal mass on the coronal CT plane (45/79, 60.0%, P < 0.001). The size of the adnexal mass with whirlpool sign was significantly larger than the mass without whirlpool sign on the transverse CT plane (median 9.6 vs. 8.6 cm, P = 0.03). No significant difference in the degree of torsion was found between patients with and without whirlpool sign on CT ( P = 0.56–0.62). Conclusion Whirlpool sign of adnexal torsion is well detected at the upper-lateral aspect of adnexal mass on the coronal CT plane.

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Lal, Hira, Priyank Yadav, Anand Chellappan, and Rajeev Singh. "Tennis ball sign: a CT sign of acute aortic dissection." Abdominal Radiology 42, no. 6 (February 10, 2017): 1811–12. http://dx.doi.org/10.1007/s00261-017-1067-x.

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Vargas, M. I., and K. Lovblad. "Dual-Energy CT and Spot Sign." American Journal of Neuroradiology 37, no. 10 (July 21, 2016): E63. http://dx.doi.org/10.3174/ajnr.a4894.

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Dissertations / Theses on the topic "CT-sign"

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Abdelhamid, Ibrahim Younouss, and О. Г. Аврунін. "CT-signs of nasal cavity of different race for dynamic model of the air flow." Thesis, Харків: ХНУРЕ, 2017. http://openarchive.nure.ua/handle/document/10598.

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Meca, Vojtěch. "i-CT Framework a aplikace pro překlad znakového jazyka." Master's thesis, Vysoké učení technické v Brně. Fakulta informačních technologií, 2017. http://www.nusl.cz/ntk/nusl-363817.

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The aim of this thesis was to create two applications for people with learning difficulties. The first, i-CT Framwork, is also an executable application to be used with the target group mentioned above. As an executable application, i-CT Framework operates as a central tool for managing users, applications, and user restrictions. Development of Gesture Translator application presented another aim of the thesis: this application can translate sign language gestures for people with learning difficulties. Both applications are functioning on Android as well as iOS operating systems.

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Schrader, Dorothea. "Die 4D-CT-Angiographie zur Bewertung der Thrombuslast bei Patienten mit akutem ischämischem Schlaganfall." Doctoral thesis, 2015. http://hdl.handle.net/11858/00-1735-0000-0022-5F89-4.

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Books on the topic "CT-sign"

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Cohen, Edmond. Upper airway obstruction in the critically ill. Oxford University Press, 2016. http://dx.doi.org/10.1093/med/9780199600830.003.0079.

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Upper airway obstruction (UAO) from any cause should be considered a life-threatening emergency. In a conscious patient, UAO may present as respiratory distress, stridor, dyspnoea, altered voice, cyanosis, cough, decreased or absent breath sounds, wheezing, the hand-to-the-throat choking sign in the case of a foreign body, facial swelling, and distended neck veins. The cause of UAO should be identified and airway management devices must be immediately available prior to any airway manipulation CT scan, flexible bronchoscopy, and pulmonary function tests should be performed to evaluate the cause and the extent of the obstruction. Obstructive sleep apnoea (OSA) patients are at increased risk of developing UAO. Endotracheal intubation, insertion of a supraglottic device, laser therapy, and endotracheal stents maybe life-saving

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Book chapters on the topic "CT-sign"

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Lee, Kyung Soo, Joungho Han, Man Pyo Chung, and Yeon Joo Jeong. "CT Halo Sign." In Radiology Illustrated, 55–61. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-37096-0_6.

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Hardjasudarma, M., R. Prieto, and B. Willis. "CT of atlanto-occipital dislocation: the “absent atlas” sign." In Proceedings of the XV Symposium Neuroradiologicum, 313–14. Berlin, Heidelberg: Springer Berlin Heidelberg, 1995. http://dx.doi.org/10.1007/978-3-642-79434-6_150.

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Johnson, Dennis L., Charles Fitz, David C. McCullough, and Saul Schwarz. "Perimesencephalic Cistern Obliteration: A CT sign of life-threatening shunt failure." In Annual Review of Hydrocephalus, 95–96. Berlin, Heidelberg: Springer Berlin Heidelberg, 1989. http://dx.doi.org/10.1007/978-3-662-11149-9_63.

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Lisowska, Aneta, Alison O’Neil, Vismantas Dilys, Matthew Daykin, Erin Beveridge, Keith Muir, Stephen Mclaughlin, and Ian Poole. "Context-Aware Convolutional Neural Networks for Stroke Sign Detection in Non-contrast CT Scans." In Communications in Computer and Information Science, 494–505. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-60964-5_43.

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"CT Halo Sign." In High-Yield Imaging: Chest, 40–41. Elsevier, 2010. http://dx.doi.org/10.1016/b978-1-4160-6161-8.00018-7.

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Walker, Christopher M. "Upper and Middle Lobe Atelectasis." In Chest Imaging, 93–97. Oxford University Press, 2019. http://dx.doi.org/10.1093/med/9780199858064.003.0017.

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Upper and middle lobe atelectasis discusses the radiographic and computed tomography (CT) manifestations of upper and middle lobe atelectasis. The most common radiographic signs of right upper lobe atelectasis include upward and medial displacement of the minor fissure, superior displacement of adjacent structures such as the hilum and main bronchus, and ipsilateral shift of the mediastinal structures. The S sign of Golden results from a centrally obstructing lung cancer as the cause of the atelectasis and manifests as a reverse S configuration of the minor fissure outlined by atelectatic lung and central mass. Left upper lobe atelectasis manifests with a veil-like opacity on frontal radiography with leftward shift of upper mediastinal structures such as the trachea and upward shift of the left main bronchus and left hemidiaphragm. The Luftsichel sign or air crescent sign may be seen and represents the hyperexpanded superior segment of the left lower lobe outlining the transverse aortic arch. Lobar atelectasis in the inpatient setting is most commonly secondary to an obstructing mucus plug. Lobar atelectasis in the outpatient setting is often a heralding sign of a centrally obstructing lung cancer and should be further evaluated with contrast-enhanced CT and/or bronchoscopy.

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Benson, Ryo E. C. "Lung Cancer: Atelectasis and Consolidation." In Chest Imaging, 269–73. Oxford University Press, 2019. http://dx.doi.org/10.1093/med/9780199858064.003.0047.

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The chapter titled atelectasis and consolidation discusses these specific manifestations of lung cancer. Patients with lung cancer can present with postobstructive atelectasis and/or pneumonia secondary to centrally obstructive neoplasms. Typical central primary lung cancers are squamous cell and small cell carcinomas. Atelectasis may be sublobar, lobar or may involve the entire lung. Lobar atelectasis may exhibit the S-sign of Golden or the luftsichel sign, which suggest underlying malignancy and require further evaluation with chest CT or bronchoscopy. Central lung cancers may also manifest with postobstructive lipoid pneumonia, typically without active infection. In addition, some adenocarcinomas may manifest with imaging features of consolidation due to replacement of alveolar airspaces by tumor. Therefore, consolidations in adults should be followed to complete radiographic resolution to exclude underlying malignancy.

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Walker, Christopher M. "Subsegmental and Rounded Atelectasis." In Chest Imaging, 105–10. Oxford University Press, 2019. http://dx.doi.org/10.1093/med/9780199858064.003.0019.

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The chapter titled subsegmental and rounded atelectasis discusses the radiographic and computed tomography (CT) appearances of subsegmental and rounded atelectasis. Subsegmental atelectasis is linear or platelike atelectasis confined to a single subsegment or extending across multiple subsegments of lung. It is seen in a variety of pulmonary and abdominal conditions including prolonged shallow breathing, pulmonary thromboembolic disease, diaphragmatic dysfunction, and pneumonia. Rounded atelectasis is folded or collapsed lung that develops adjacent to an area of pleural thickening, fibrosis, or effusion. There are several imaging features that must be present before confidently diagnosing rounded atelectasis including significant contact with adjacent pleural abnormality, signs of volume loss, acute angles with the pleura, and the comet tail sign. If these criteria are met, CT followup is sufficient in most cases.

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Agoston-Coldea, Lucia, Carmen Cionca, and Silvia Lupu. "Coronary CT Angiography and the Napkin-ring Sign Indicates High-Risk Atherosclerotic Lesions." In Coronary Artery Disease - Assessment, Surgery, Prevention. InTech, 2015. http://dx.doi.org/10.5772/61393.

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Walker, Christopher M. "Volume Loss." In Chest Imaging, 85–87. Oxford University Press, 2019. http://dx.doi.org/10.1093/med/9780199858064.003.0015.

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Atelectasis is one of the most frequently encountered imaging abnormalities on chest radiography and CT, with different implications when detected in hospitalized patients as compared to those encountered in the outpatient setting. Bedridden and postoperative patients often have a dependent type of atelectasis, whereas lobar atelectasis detected in an outpatient is often a harbinger of underlying malignancy (e.g. lung cancer). Medical malpractice cases are sometimes based on the missed diagnosis of lung cancer manifesting as atelectasis and misinterpreted by a radiologist. It is imperative that radiologists be familiar with the direct and indirect imaging signs of atelectasis, as well as the classic patterns of lobar atelectasis. Specific signs of lobar atelectasis will be described including the S sign of Golden and the luftsichel sign. A confident knowledge of lung anatomy, particularly with regard to hilar anatomy and the normal appearance of mediastinal contours and the interlobar fissures, will enable the radiologist to confidently diagnose atelectasis and narrow the differential diagnostic considerations.

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Conference papers on the topic "CT-sign"

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Ray, Animesh, Ankit Mittal, and Surabhi Vyas. "CT Halo sign - A systematic review and meta analysis." In ERS International Congress 2019 abstracts. European Respiratory Society, 2019. http://dx.doi.org/10.1183/13993003.congress-2019.pa4819.

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Silva, Bruno Custódio, Vivianne Amanda do Nascimento, Maria Isabelle Nakano Vieira, Guilherme Rocha Spiller, and Celso David Lago. "Medium cerebral artery thrombosis – radiological fing: hyperdense MCA sign – case report." In XIII Congresso Paulista de Neurologia. Zeppelini Editorial e Comunicação, 2021. http://dx.doi.org/10.5327/1516-3180.244.

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Introduction: Vascular diseases are the leading cause of death in the world. Although major advances in neuroimaging and stroke treatment have contributed to a decrease in mortality, strokes occupy second place in the list. Case report: A 75-year-old man is admitted to emergency with an altered neurological examination: right hemiplegia, Broca’s aphasia and dysphagia. Conscience was preserved. Computed tomography (CT) was performed, which showed the radiological finding of hyperdense MCA sign, confirming the diagnosis of ischemic stroke with involvement of the left middle cerebral artery branch. The treatment, in this case, was outside the criteria for thrombolytics. Discussion: Irrigation of the brain is done by Willis polygon. One of the essential branches is the medium cerebral artery (MCA), the most important termination of the internal carotid arteries, responsible for blood supply of the dorsolateral hemifacial of both cerebral hemispheres, irrigating the frontal, parietal and temporal lobes. The imaging exam in suspected cases of stroke focuses on confirming its diagnosis and etiology, location of the lesion, extent of ischemic evolution, therapeutic treatment and prognosis. CT is the main modality of neuroimaging for stroke and an important radiological finding is the hyperdense artery sign, which is more common in MCA and demonstrates an evolving or impending infarction and is secondary to a plunger housed in this vessel. Therefore, it is an important early tomographic sign of ischemic stroke found on non-contrast blood CT. Conclusion: Ischemic stroke is the most common etiology among strokes. The diagnosis must be based mainly on anamnesis and image exam, such as a CT scan. The CT performed helps to guide treatment, prognosis and clinical evolution. Finally, the recognition of the hyperdense MCA sign, found in the first 6 hours, is also extremely helpful for stroke classification.

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Almajthoub, Z., M. AlNabulsi, and E. Alhanoun. "An Unusual Cause of Halo Sign Finding on Chest CT Scan." In American Thoracic Society 2020 International Conference, May 15-20, 2020 - Philadelphia, PA. American Thoracic Society, 2020. http://dx.doi.org/10.1164/ajrccm-conference.2020.201.1_meetingabstracts.a7297.

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Lee, Yongbum, Noriyuki Takahashi, Du-Yih Tsai, and Hiroshi Fujita. "Detectability improvement of early sign of acute stroke on brain CT images using an adaptive partial smoothing filter." In Medical Imaging, edited by Joseph M. Reinhardt and Josien P. W. Pluim. SPIE, 2006. http://dx.doi.org/10.1117/12.654242.

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Zusag, M., S. R. Desai, M. Di Paolo, T. Semple, A. Shah, and E. D. Angelini. "SAPSAM - Sparsely Annotated Pathological Sign Activation Maps - A Novel Approach To Train Convolutional Neural Networks On Lung CT Scans Using Binary Labels Only." In 2019 IEEE 16th International Symposium on Biomedical Imaging (ISBI). IEEE, 2019. http://dx.doi.org/10.1109/isbi.2019.8759590.

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Souza, Felipe Fanine de, Ana Luiza da Silva Wendhausen, Felipe Reinert Avilla Machado, Gustavo Figueiredo da Silva, Maria Eduarda Angelo de Mendonça Fileti, Raddib Eduardo Noleto da Nóbrega de Oliveira, Rafael Pereira Guimarães, et al. "Chorea in a Non-Ketotic Hyperglycemic State: Case Report." In XIII Congresso Paulista de Neurologia. Zeppelini Editorial e Comunicação, 2021. http://dx.doi.org/10.5327/1516-3180.099.

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Context: Non-ketotic hyperglycemia is a rare cause of chorea. Clinical findings are usually unilateral and potentially reversible after treatment for hyperglycemia. Hyperglycemia leads to asymmetric multifocal petechial hemorrhages of the basal ganglia, leading to a dysfunction of neuronal networks that connect the basal ganglia and the motor cortical areas, mainly affecting the subthalamic nucleus and contralateral striatum, which is highlighted by typical hyperdense lesions of the basal ganglia in computed tomography (CT) of the brain. This study aimed to report a case of a patient with choreiform movements due to a rare etiology of hyperglycemia nonketotic in a Hospital Public of Joinville, SC. The study was carried out through the collection and analysis of a patient’s medical record. Case report: Female patient, 54 years old, who presented for 6 days choreiform movements in the face, left upper limb and, discreetly, in the left lower limb. Snake tongue sign and milkmaid’s grip positive, without dysarthria. In the laboratory exam, glucose of 600 mg / dL; without further changes. Cranial tomography showed hyperdensity in the putamen region on the right. The treatment was started to obtain better glycemic control and Risperidone 3 mg / day. Conclusions: It is concluded, then, that non-ketotic hyperglycemia is an uncommon, but reversible cause of chorea, and may manifest itself due to an uncontrolled non-ketotic diabetes mellitus. Its pathogenic mechanism remains to be clarified. In addition, clinical, epidemiological, imaging and laboratory findings, together, corroborate for early diagnosis and proper management.

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Berrich, Emna, Fethi Aloui, and Jack Legrand. "Experimental Study on Oscillatory Couette-Taylor Flows Behaviour." In ASME 2013 Fluids Engineering Division Summer Meeting. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/fedsm2013-16308.

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In the simplest and original case of study of the Taylor–Couette TC problems, the fluid is contained between a fixed outer cylinder and a concentric inner cylinder which rotates at constant angular velocity. Much of the works done has been concerned on steady rotating cylinder(s) i.e. rotating cylinders with constant velocity and the various transitions that take place as the cylinder(s) velocity (ies) is (are) steadily increased. On this work, we concentrated our attention in the case in which the inner cylinder velocity is not constant, but oscillates harmonically (in time) clockwise and counter-clockwise while the outer cylinder is maintained fixed. Our aim is to attempt to answer the question if the modulation makes the flow more or less stable with respect to the vortices apparition than in the steady case. If the modulation amplitude is large enough to destabilise the circular Couette flow, two classes of axisymmetric Taylor vortex flow are possible: reversing Taylor Vortex Flow (RTVF) and Non-Reversing Taylor Vortex Flow (NRTVF) (Youd et al., 2003; Lopez and Marques, 2002). Our work presents an experimental investigation of the effect of oscillatory Couette-Taylor flow, i.e. both the oscillation frequency and amplitude on the apparition of RTVF and NRTVF by analysing the instantaneous and local mass transfer and wall shear rates evolutions, i.e. the impact of vortices at wall. The vortices may manifest themselves by the presence of time-oscillations of mass transfer and wall shear rates, this generally corresponds to an instability apparition even for steady rotating cylinder. On laminar CT flow, the time-evolution of wall shear rate is linear. It may be presented as a linear function of the angular velocity, i.e. the evolution is steady even if the angular velocity is not steady. At a “critical” frequency and amplitude, the laminar CT flow is disturbed and Taylor vortices appear. Comparing to a steady velocity case, oscillatory flow accelerate the instability apparition, i.e. the critical Taylor number corresponds to the transition is smaller than that of the steady case. For high oscillation amplitudes of the inner cylinder rotation, the mass transfer time-evolution has a sinusoidal evolution with non equal oscillation amplitudes. If the oscillation amplitude is large enough, it can destabilize the laminar Couette flow, Taylor vortices appears. The vortices direction can be deduced from the sign of the instantaneous wall shear rate time evolution.

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Arora, Rahul D. "Definition, etiopathogenesis, management and role of flouroquinolone prophylaxis in prevention of spontaneous bacterial peritonitis complicating malignant ascites." In 16th Annual International Conference RGCON. Thieme Medical and Scientific Publishers Private Ltd., 2016. http://dx.doi.org/10.1055/s-0039-1685345.

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Background: Malignancy related ascites encompasses multiple etiologies which include peritoneal carcinomatosis, hepatic synthetic dysfunction due to parenchymal involvement by the tumour, transcoeloemic metastasis and chylous ascites due to lymphatic obstruction. Primary Cancer type, liver metastasis and serum albumin have been listed as independent prognostic markers in malignant ascites. Spontaneous Bacterial Peritonitis is usually seen as a complication of decompensated chronic liver disease due to translocation of bacteria or haematogenous dissemination from a distant focus of infection. The combination of a positive peritoneal fluid culture and an ascitic fluid neutrophil count >250 cells/mm3 and no evidence of intra-abdominal source of infection; or 2) culture negative neutrocytic ascites: the combination of negative peritoneal fluid bacterial culture and neutrophil count >500 cells/mm3, without antibiotics within 7 days with no obvious source of infection are used to define spontaneous bacterialperitonitis. Ciprofloxacin prophylaxis has been proposed as a prophylaxis to reduce the incidence and prevent the recurrence of spontaneous bacterial peritonitis. Materials and Methods: A web search of indexed literature was carried out articles containing information on spontaneous bacterial peritonitis in the setting of malignancy or malignancy related ascites or malignant ascites. Articles that carried relevant information about etiopathogenesis, management and translational research in the context of malignant ascites were also included. Results: A total of 32 articles were analysed and about half of them included in the discussion to answer the research question. Discussion: Inflammatory cytokines released by tumor and immune cells compromise the mesothelial cell layer that lines the peritoneal cavity, exposing the underlying extracellular matrix to which cancer cells readily attach leading to formation of spheroids which imparts resistance to anoikis, apoptosis and chemotherapeutics leading to efficient feed forward progressive cycle of seeding and growth of peritoneal metastasis. Intraperitoneal metastasis can cause peritoneal dysfunction, adhesions and malignant ascites. Epithelial mesenchymal transistion and myofibroblastic transformation occur in the mesothelial cells in response to pathological stimuli. Vascular endothelial growth factor is an important mitogen for endothelial cells and plays an important role in increasing capillary vascular permeability. In preclinical studies systemic administration of VEGF Trap which acts as a decoy receptor for VEGF has shown to decrease the formation of ascites fluid and prevent tumour dissemination. Epithelial ovarian cancer cells have developed various mechanisms to evade immune surveillance like development of surface microvesicles which contain CD 95 ligand leading to apoptosis of immune cells. Higher levels of osteoproteogerin, IL 10 and leptin in the ascitic fluid have been associated with a poor prognosis in malignant ascites. Tethered bowel sign and presence of fluid in the omental bursa on CT have been shown to distinguish between malignant ascites and Cirrhotic ascites with accuracy. Immunological approaches to management of malignant ascites include use of intraperitoneal triamcinolone, interferon, long acting synthetic corticosteroids and the trifoliate antibody catumaxomab. VEGF Inhihibitors like octreotide and long acting depot preparations of lanreotide have also been shown to be feasible therapeutic options. Anti androgenic agents and PARP inhibitors have also been proposed as management options. Spontaneous bacterial peritonitis in the setting of malignancy in the absence of hepatic dysfunction has been reported to have a poorer prognosis than SBP in the setting of decompensated liver disease. Monomicrobial and polymicrobial bacterascites have been proposed in the absence of an elevated neutrophil ascitic fluid count that does not meet the diagnostic criteria. Extensive liver metastasis where the diseased liver can be expected to behave like a cirrhotic liver and gastrointestinal bleeding (on the basis of an isolated case report) have been considered as risk factors for the development of SBP in malignant ascites. In a case series of 8 patients with malignancy related ascites Patients with total ascitic fluid concentration of less than 1 gm per litre were found to be at risk for Spontaneous bacterial peritonitis and warrant flouroquinolone prophylaxis. Conclusion: Spontaneous Bacterial Peritonitis complicating malignant ascites is questionable entity. Good quality Audits and Randomised control trials are warranted to in this domain to enable the definition of incidence, antecedent complications, management and prophylaxis to ensure applicability of translational research to the clinical domain.

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