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CT scan imaging

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https://www.readbyqxmd.com/read/28544826/preoperative-computed-tomography-scan-analysis-of-interleaflets-triangles-to-guide-aortic-root-repair-procedures
#1
Claudia Romagnoni, Andrea Mangini, Monica Contino, Rubina Rosa, Sonia Ippolito, Guido Gelpi, Carlo Antona
BACKGROUND: Stabilization of the ventriculo-aortic junction (VAJ) is gaining increasing interest in the context of aortic valve repair, since its dilation is a well-recognized risk factor for long-term repair failure. Interleaflets triangles are key elements of the VAJ, but cannot be completely visualized using echocardiography. A three-dimensional (3D) reconstruction of electrocardiogram-triggered computed tomography (CT) scan images allows an analysis of the real dimensions and anatomic characteristics of the subcommissural triangles...
January 2017: Journal of Heart Valve Disease
https://www.readbyqxmd.com/read/28544620/phenotyping-cardiac-and-structural-birth-defects-in-fetal-and-newborn-mice
#2
REVIEW
Xiaoqin Liu, Andrew J Kim, William Reynolds, Yijen Wu, Cecilia W Lo
Mouse models are invaluable for investigating the developmental etiology and molecular pathogenesis of structural birth defects. While this has been deployed for studying a wide spectrum of birth defects, mice are particularly valuable for modeling congenital heart disease, given they have the same four-chamber cardiac anatomy as in humans. We have developed the use of noninvasive fetal ultrasound together with micro-computed tomography (micro-CT) imaging for high throughput phenotyping of mice for congenital heart defects (CHD) and other developmental anomalies...
May 22, 2017: Birth Defects Res
https://www.readbyqxmd.com/read/28544269/a-novel-approach-for-early-evaluation-of-orthodontic-process-by-a-numerical-thermo-mechanical-analysis
#3
Z Heidary, A Mojra, M Shirazi, M Bazargan
The main objective of this paper is to propose a novel method that provides an opportunity to evaluate an orthodontic process at early phase of the treatment. This was accomplished by finding out a correlation between the applied orthodontic force and thermal variations in the tooth structure. To this end, geometry of the human tooth surrounded by the connective soft tissue called the periodontal ligament and the bone was constructed by employing dental CT scan images of a specific case. The periodontal ligament was modeled by finite strain viscoelastic model through a nonlinear stress-strain relation (hyperelasticity) and nonlinear stress-time relation (viscoelasticity)...
May 21, 2017: International Journal for Numerical Methods in Biomedical Engineering
https://www.readbyqxmd.com/read/28543774/spectral-signal-density-of-carotid-plaque-using-dual-energy-computed-tomography
#4
Exequiel Reynoso, Gastón A Rodriguez-Granillo, Carlos Capunay, Alejandro Deviggiano, Francisco Meli, Patricia Carrascosa
BACKGROUND AND PURPOSE: Plaque characterization using virtual monochromatic imaging derived from dual-energy computed tomography (CT) angiography requires the determination of normal signal density values of each plaque component. We sought to explore the signal density values of carotid plaque components using dual-energy compared to conventional single-energy CT angiography (CTA), and to establish the energy level with the largest differences between plaque components. METHODS: The present prospective study involved consecutive patients referred for carotid artery evaluation by CTA...
May 25, 2017: Journal of Neuroimaging: Official Journal of the American Society of Neuroimaging
https://www.readbyqxmd.com/read/28543704/comparison-of-2-vs-3-dimensional-fracture-mapping-strategies-for-3-dimensional-computerized-tomography-reconstructions-of-scapula-neck-body-fractures
#5
Anthony J Dugarte, Luisa Tkany, Lisa K Schroder, Andreas Petersik, Peter A Cole
Fracture mapping has been used in the understanding of injury patterns in different bones. To our knowledge, there are no applications of this technique using three-dimensional (3D) morphologic fracture characteristics. Previously, scapula fractures were mapped by transferring information from 3D computed tomography to a two-dimensional (2D) template. Cole et al. determined that 3D Computerized Tomography (CT) scans were more reliable compared to plain radiographs in terms of scapular angulation, translation, and glenopolar angle measurements...
May 19, 2017: Journal of Orthopaedic Research: Official Publication of the Orthopaedic Research Society
https://www.readbyqxmd.com/read/28543682/residual-thymic-tissue-and-lymph-node-involvement-by-acute-myeloid-leukaemia-presenting-as-mediastinal-strongly-18-fdg-pet-positive-masses
#6
Georg Maschmeyer, Ingo Brink, Doris Jähne, Renate Arnold, Olaf Schega
We report on a multidisciplinary management of a 68-year old AML patient presenting with a PET-positive mediastinal tumour typical for lymph node metastasis. It was removed via minimally invasive thoracoscopic intervention and was identified as a thymus residual infiltrated by AML. Follow-up PET-CT scan after resection and remission induction chemotherapy was completely normal. To our knowledge, this is the first documented case report of AML presenting with PET-positive infiltrates of thymic and lymph node tissue along the aortic bow mimicking a second intrathoracic malignancy...
May 22, 2017: European Journal of Haematology
https://www.readbyqxmd.com/read/28542331/the-feasibility-of-endoscopy-ct-image-registration-in-the-head-and-neck-without-prospective-endoscope-tracking
#7
W Scott Ingram, Jinzhong Yang, Beth M Beadle, Richard Wendt, Arvind Rao, Xin A Wang, Laurence E Court
PURPOSE: Endoscopic examinations are frequently-used procedures for patients with head and neck cancer undergoing radiotherapy, but radiation treatment plans are created on computed tomography (CT) scans. Image registration between endoscopic video and CT could be used to improve treatment planning and analysis of radiation-related normal tissue toxicity. The purpose of this study was to explore the feasibility of endoscopy-CT image registration without prospective physical tracking of the endoscope during the examination...
2017: PloS One
https://www.readbyqxmd.com/read/28542311/18f-fdg-pet-ct-based-early-treatment-response-evaluation-of-nanoparticle-assisted-photothermal-cancer-therapy
#8
Kamilla Norregaard, Jesper T Jørgensen, Marina Simón, Fredrik Melander, Lotte K Kristensen, Pól M Bendix, Thomas L Andresen, Lene B Oddershede, Andreas Kjaer
Within the field of nanoparticle-assisted photothermal cancer therapy, focus has mostly been on developing novel heat-generating nanoparticles with the right optical and dimensional properties. Comparison and evaluation of their performance in tumor-bearing animals are commonly assessed by changes in tumor volume; however, this is usually a late-occurring event. This study implements 2-deoxy-2-[F-18]fluoro-D-glucose positron emission tomography imaging to perform early evaluation of the treatment outcome of photothermal therapy...
2017: PloS One
https://www.readbyqxmd.com/read/28542116/prevalence-and-clinical-characteristics-of-spontaneous-splenorenal-shunt-in-liver-cirrhosis-a-retrospective-observational-study-based-on-contrast-enhanced-computed-tomography-ct-and-magnetic-resonance-imaging-mri-scans
#9
Xingshun Qi, Xiaolong Qi, Yongguo Zhang, Xiaodong Shao, Chunyan Wu, Yongji Wang, Ran Wang, Xintong Zhang, Han Deng, Feifei Hou, Jing Li, Xiaozhong Guo
BACKGROUND This is a retrospective observational study evaluating the prevalence and clinical characteristics of spontaneous splenorenal shunt in liver cirrhosis. MATERIAL AND METHODS We included a total of 105 cirrhotic patients who were admitted to our hospital between June 2012 and December 2013 and underwent contrast-enhanced CT and/or MRI scans at admissions. Spontaneous splenorenal shunt was identified. Clinical and laboratory data were compared between cirrhotic patients with and without spontaneous splenorenal shunt...
May 25, 2017: Medical Science Monitor: International Medical Journal of Experimental and Clinical Research
https://www.readbyqxmd.com/read/28541855/rate-and-reasons-for-repeat-ct-scanning-in-transferred-trauma-patients
#10
James F Holmes, Blake G Siglock, Michael T Corwin, Michael A Johnson, Edgardo S Salcedo, Gabriel S Espinoza, Ramit Lamba
To describe the reasons and additional radiation for CT scans repeated after transfer to a trauma center. Retrospective study of patients transferred to a trauma center. Patients had repeat CT if a CT of the same region was repeated at the trauma center's emergency department. Indications for repeat CT scanning were abstracted. Radiation dosage was calculated in millisieverts. A total of 370 had CT scans and were transferred. Mean age was 39.1 ± 28.0 years. Seventy-four [20.0%, 95% confidence interval (CI) 16...
May 1, 2017: American Surgeon
https://www.readbyqxmd.com/read/28540798/pathological-effects-of-lung-radiofrequency-ablation-that-contribute-to-pneumothorax-using-a-porcine-model
#11
Jean Izaaryene, Frederic Cohen, Philippe Souteyrand, Pierre-Henri Rolland, Vincent Vidal, Jean-Michel Bartoli, Veronique Secq, Jean-Yves Gaubert
OBJECTIVES: The incidence of pneumothorax is 7 times higher after lung radiofrequency ablation (RFA) than after lung biopsy. The reasons for such a difference have never been objectified. The histopathologic changes in lung tissue are well-studied and established for RF in the ablation zone. However, it has not been previously described what the nature of thermal injury might be along the shaft of the RF electrode as it traverses through normal lung tissue to reach the ablation zone. The purpose of this study was to determine the changes occurring around the RF needle along the pathway between the ablated zone and the pleura...
April 17, 2017: International Journal of Hyperthermia
https://www.readbyqxmd.com/read/28540776/computed-tomography-guided-radiofrequency-ablation-of-intra-articular-osteoid-osteoma-a-single-centre-s-experience
#12
D K Filippiadis, G Velonakis, C Kostantos, V Kouloulias, E Brountzos, N Kelekis, A Kelekis
OBJECTIVE: To evaluate safety and efficacy of radiofrequency ablation (RFA) in the treatment of painful intra-articular osteoid osteoma. MATERIALS AND METHODS: During the last 3 years, 15 patients underwent computed tomography (CT)-guided biopsy and RFA of symptomatic intra-articular osteoid osteoma. In order to assess and sample the nidus, a coaxial bone biopsy system was used. Biopsy was performed and followed by ablation session with osteoid osteoma protocol in all cases...
March 1, 2017: International Journal of Hyperthermia
https://www.readbyqxmd.com/read/28540524/changes-in-tumor-biology-during-chemoradiation-of-cervix-cancer-assessed-by-multiparametric-mri-and-hypoxia-pet
#13
Petra Georg, Piotr Andrzejewski, Pascal Baltzer, Michaela Daniel, Wolfgang Wadsak, Markus Mitterhauser, Alina Sturdza, Katarina Majercakova, Georgios Karanikas, Richard Pötter, Marcus Hacker, Thomas Helbich, Dietmar Georg, Katja Pinker
PURPOSE: Imaging biomarkers assessed with magnetic resonance imaging (MRI) and/or positron emission tomography (PET) enable non-invasive tumor characterization in cervix cancer patients. We investigated the spatio-temporal stability of hypoxia, perfusion, and the cell density of tumors over time by repetitive imaging prior to, during, and after radio-chemotherapy. PROCEDURES: Thirteen patients were included in this prospective study. The imaging protocol included the following: [(18)F]fluoromisonidazole ([(18)F]FMISO)-PET/x-ray computed tomography (CT) and multiparametric (mp)-MRI at four time-points (TP): baseline (BL); and weeks 2 (TP1), 5 (TP2), and 19 after treatment start (follow-up FU)...
May 24, 2017: Molecular Imaging and Biology: MIB: the Official Publication of the Academy of Molecular Imaging
https://www.readbyqxmd.com/read/28540211/delayed-enhancement-cardiac-computed-tomography-for-the-assessment-of-myocardial-infarction-from-bench-to-bedside
#14
REVIEW
Gaston A Rodriguez-Granillo
A large number of studies support the increasingly relevant prognostic value of the presence and extent of delayed enhancement (DE), a surrogate marker of fibrosis, in diverse etiologies. Gadolinium and iodinated based contrast agents share similar kinetics, thus leading to comparable myocardial characterization with cardiac magnetic resonance (CMR) and cardiac computed tomography (CT) at both first-pass perfusion and DE imaging. We review the available evidence of DE imaging for the assessment of myocardial infarction (MI) using cardiac CT (CTDE), from animal to clinical studies, and from 16-slice CT to dual-energy CT systems (DECT)...
April 2017: Cardiovascular Diagnosis and Therapy
https://www.readbyqxmd.com/read/28540209/myocardial-blood-flow-quantification-for-evaluation-of-coronary-artery-disease-by-computed-tomography
#15
REVIEW
Filippo Cademartiri, Sara Seitun, Alberto Clemente, Ludovico La Grutta, Patrizia Toia, Giuseppe Runza, Massimo Midiri, Erica Maffei
During the last decade coronary computed tomography angiography (CTA) has become the preeminent non-invasive imaging modality to detect coronary artery disease (CAD) with high accuracy. However, CTA has a limited value in assessing the hemodynamic significance of a given stenosis due to a modest specificity and positive predictive value. In recent years, different CT techniques for detecting myocardial ischemia have emerged, such as CT-derived fractional flow reserve (FFR-CT), transluminal attenuation gradient (TAG), and myocardial CT perfusion (CTP) imaging...
April 2017: Cardiovascular Diagnosis and Therapy
https://www.readbyqxmd.com/read/28540199/role-of-different-imaging-modalities-of-vascular-calcification-in-predicting-outcomes-in-chronic-kidney-disease
#16
REVIEW
Sinee Disthabanchong, Sarinya Boongird
Vascular calcification (VC) is common among patients with chronic kidney disease (CKD). The severity of VC is associated with increased risk of cardiovascular events and mortality. Risk factors for VC include traditional cardiovascular risk factors as well as CKD-related risk factors such as increased calcium and phosphate load. VC is observed in arteries of all sizes from small arterioles to aorta, both in the intima and the media of arterial wall. Several imaging techniques have been utilized in the evaluation of the extent and the severity of VC...
May 6, 2017: World Journal of Nephrology
https://www.readbyqxmd.com/read/28540078/use-of-multidetector-row-computed-tomography-scan-to-detect-pannus-formation-in-prosthetic-mechanical-aortic-valves
#17
REVIEW
Mohamed A Aladmawi, Claudio Pragliola, Olga Vriz, Domenico Galzerano
Obstruction of a mechanical aortic valve by pannus formation at the subvalvular level is a major long-term complication of aortic valve replacement (AVR). In fact, pannus is sometime difficult to differentiate from patient-prosthesis mismatch or valve thrombosis. In most cases cine-angiography and echocardiography, either transthoracic or transesophageal, cannot correctly visualize the complication when the leaflets show a normal mobility. Recent technological refinements made this difficult diagnosis possible by ECG-gated computed tomography (CT) scan which shows adequate images in 90% of the cases and can differentiate pannus from fresh and organized thrombus...
April 2017: Journal of Thoracic Disease
https://www.readbyqxmd.com/read/28538630/the-evolution-of-care-improves-outcome-in-blunt-thoracic-aortic-injury-a-western-trauma-association-multicenter-study
#18
Steven R Shackford, Casey E Dunne, Riyad Karmy-Jones, William Long, Desarom Teso, Martin A Schreiber, Justin Watson, Cheri Watson, Robert C McIntyre, Lisa Ferrigno, Mark L Shapiro, Kevin Southerland, Julie A Dunn, Paul Reckard, Thomas M Scalea, Megan Brenner, William A Teeter
BACKGROUND: The management of blunt thoracic aortic injury (BTAI) has evolved radically in the last decade with changes in the processes of care and the introduction of thoracic endovascular repair (TEVAR). These changes have wrought improved outcome, but the direct effect of TEVAR on outcome remains in question as previous studies have lacked vigorous risk adjustment and long-term follow-up. To address these knowledge gaps, we compared the outcomes of TEVAR, open surgical repair, and nonoperative management for BTAI...
May 22, 2017: Journal of Trauma and Acute Care Surgery
https://www.readbyqxmd.com/read/28538408/precision-of-quantitative-computed-tomography-texture-analysis-using-image-filtering-a-phantom-study-for-scanner-variability
#19
Koichiro Yasaka, Hiroyuki Akai, Dennis Mackin, Laurence Court, Eduardo Moros, Kuni Ohtomo, Shigeru Kiryu
Quantitative computed tomography (CT) texture analyses for images with and without filtration are gaining attention to capture the heterogeneity of tumors. The aim of this study was to investigate how quantitative texture parameters using image filtering vary among different computed tomography (CT) scanners using a phantom developed for radiomics studies.A phantom, consisting of 10 different cartridges with various textures, was scanned under 6 different scanning protocols using four CT scanners from four different vendors...
May 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/28537695/robotic-assisted-laparoscopic-excision-of-a-retroperitoneal-ganglioneuroma
#20
Lucas Medeiros Burttet, Fernando Jahn da Silva Abreu, Gabrielle Aguiar Varaschin, Brasil Silva, Milton Berger
INTRODUCTION: Ganglioneuromas are rare benign neoplasms of the sympathetic nervous system. We describe the case of an incidentally found ganglioneuroma in a woman. To our knowledge this is the first described case of robotic excision of a retroperitoneal ganglioneuroma. CASE: A 41-year-old female had an incidental retroperitoneal mass found during a routine US. CT scan and MRI showed an 8.3cm homogeneous mass, adjacent to left kidney upper pole, with peripheral contrast enhancement...
May 23, 2017: International Braz J Urol: Official Journal of the Brazilian Society of Urology
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