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MDCT angiography

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https://www.readbyqxmd.com/read/28095022/estimating-effective-dose-of-radiation-from-pediatric-cardiac-ct-angiography-using-a-64-mdct-scanner-new-conversion-factors-relating-dose-length-product-to-effective-dose
#1
Sigal Trattner, Anjali Chelliah, Peter Prinsen, Carrie B Ruzal-Shapiro, Yanping Xu, Sachin Jambawalikar, Maxwell Amurao, Andrew J Einstein
OBJECTIVE: The purpose of this study is to determine the conversion factors that enable accurate estimation of the effective dose (ED) used for cardiac 64-MDCT angiography performed for children. MATERIALS AND METHODS: Anthropomorphic phantoms representative of 1- and 10-year-old children, with 50 metal oxide semiconductor field-effect transistor dosimeters placed in organs, underwent scanning performed using a 64-MDCT scanner with different routine clinical cardiac scan modes and x-ray tube potentials...
January 17, 2017: AJR. American Journal of Roentgenology
https://www.readbyqxmd.com/read/28048867/mo-ab-bra-10-super-high-temporal-resolution-cardiac-ct-imaging-using-smart-recon
#2
Y Li, X Cao, Z Xing, X Sun, J Hsieh, G Chen
PURPOSE: Coronary CT angiography is a challenging task currently limited by the achievable temporal resolution of modern MDCT scanners. In this work, a highly innovative method has been developed and validated to improve temporal resolution of the MDCT by a factor of four with the newly developed SMART-RECON method to enable high quality coronary CTA exams. The primary purpose of this paper is to investigate the relationships between: (1) SMART-RECON and the motion pattern; (2) SMART-RECON and the average speed of moving vessels; (3) SMART-RECON and the position and direction of moving vessels...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047535/su-f-i-38-patient-organ-specific-dose-assessment-in-coronary-ct-angiograph-using-voxellaized-volume-dose-index-in-monte-carlo-simulation
#3
Mohammadi Gh Fallal, Alam N Riyahi, Gh Graily, R Paydar
PURPOSE: Clinical use of multi detector computed tomography(MDCT) in diagnosis of diseases due to high speed in data acquisition and high spatial resolution is significantly increased. Regarding to the high radiation dose in CT and necessity of patient specific radiation risk assessment, the adoption of new method in the calculation of organ dose is completely required and necessary. In this study by introducing a conversion factor, patient organ dose in thorax region based on CT image data using MC system was calculated...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28008705/navigating-the-mesentery-part-ii-vascular-abnormalities-and-a-review-of-the-literature
#4
Jens Marius Nesgaard, Bojan V Stimec, Arne Olav Bakka, Bjorn Edwin, Dejan Ignjatovic
AIM: Vascular abnormalities present benefits and/or disadvantages for the patient undergoing surgery. The aims of this study were to define, classify, and demonstrate the courses and to assess the clinical value of arterial and venous abnormalities in the central mesentery. METHOD: We conducted a review of the anatomy of 340 patients planned for enrolment in the "Safe Radical D3 Right Hemicolectomy for Cancer through Preoperative Biphasic MDCT Angiography" trial, 312 of whom were submitted to surgery...
December 23, 2016: Colorectal Disease: the Official Journal of the Association of Coloproctology of Great Britain and Ireland
https://www.readbyqxmd.com/read/27995807/optimal-scan-timing-for-artery-vein-separation-at-whole-brain-ct-angiography-using-a-320-row-mdct-volume-scanner
#5
Takashi Shirasaka, Akio Hiwatashi, Koji Yamashita, Masatoshi Kondo, Hiroshi Hamasaki, Yamato Shimomiya, Yasuhiko Nakamura, Yoshinori Funama, Hiroshi Honda
OBJECTIVES: A 320-row MDCT is expected for good artery-vein separation in terms of temporal resolution. However, shortened scan duration may lead to insufficient vascular enhancement. We assessed the optimal scan timing for the artery-vein separation at whole-brain CT angiography (CTA) when bolus tracking was used at 320-row MDCT. METHODS: We analyzed 60 patients, who underwent whole-brain four-dimensional CTA. Difference in CT attenuation (Datt) between the internal carotid artery (ICA) and the superior sagittal sinus was calculated in each phase...
December 20, 2016: British Journal of Radiology
https://www.readbyqxmd.com/read/27987537/comparison-of-hepatic-mdct-mri-and-dsa-to-explant-pathology-for-the-detection-and-treatment-planning-of-hepatocellular-carcinoma
#6
Lauren M Ladd, Temel Tirkes, Mark Tann, David M Agarwal, Matthew S Johnson, Bilal Tahir, Kumaresan Sandrasegaran
BACKGROUND/AIMS: The diagnosis and treatment plan for hepatocellular carcinoma (HCC) can be made from radiologic imaging. However, lesion detection may vary depending on the imaging modality. This study aims to evaluate the sensitivities of hepatic multidetector computed tomography (MDCT), magnetic resonance imaging (MRI), and digital subtraction angiography (DSA) in the detection of HCC and the consequent management impact on potential liver transplant patients. METHODS: One hundred and sixteen HCC lesions were analyzed in 41 patients who received an orthotopic liver transplant (OLT)...
December 2016: Clinical and Molecular Hepatology
https://www.readbyqxmd.com/read/27939049/impact-of-methodologic-differences-in-three-dimensional-echocardiographic-measurements-of-the-aortic-annulus-compared-with-computed-tomographic-angiography-before-transcatheter-aortic-valve-replacement
#7
Omar K Khalique, Nadira B Hamid, Jonathon M White, David J Bae, Susheel K Kodali, Tamim M Nazif, Torsten P Vahl, Jean-Michel Paradis, Isaac George, Martin B Leon, Rebecca T Hahn
BACKGROUND: Three-dimensional (3D) echocardiographic (3DE) imaging is an alternative to multi-detector row computed tomography (MDCT) for aortic annular measurement before transcatheter aortic valve replacement (TAVR). A commonly used direct planimetry from a reconstructed short-axis view has not been compared with semiautomated 3DE methods. Typically accepted optimal cutoffs for percent prosthesis-area oversizing of the balloon-expandable SAPIEN or SAPIEN XT valve to native annular size are approximately 5% to 15%...
December 6, 2016: Journal of the American Society of Echocardiography
https://www.readbyqxmd.com/read/27894580/imaging-studies-for-preoperative-planning-of-perforator-flaps-an-overview
#8
REVIEW
Shimpei Ono, Hiromitsu Hayashi, Hiroyuki Ohi, Rei Ogawa
The vascular anatomy of perforators varies between individuals; thus, accurate preoperative assessment of perforators is essential for safely planning perforator flaps. Perforator computed tomographic angiography (P-CTA) with multidetector-row computed tomography (MDCT) is one of the best available methods to precisely reveal the 3-dimensional anatomic details of perforators. The aim of this report is to describe the authors' experience using P-CTA with MDCT for detecting the perforating vessel preoperatively and a step-by-step approach to harvest perforator flaps based on this technique...
January 2017: Clinics in Plastic Surgery
https://www.readbyqxmd.com/read/27891547/severe-pelvic-injury-vascular-lesions-detected-by-ante-and-post-mortem-contrast-medium-enhanced-ct-and-associations-with-pelvic-fractures
#9
Mahmoud Hussami, Silke Grabherr, Reto A Meuli, Sabine Schmidt
OBJECTIVES: The objectives of this study were to compare arterial and venous contrast medium extravasation in severe pelvic injury detected by ante- and post-mortem multi-detector CT (MDCT) and determine whether vascular injury is associated with certain types of pelvic fracture. METHODS: We retrospectively included two different cohorts of blunt pelvic trauma with contrast medium extravasation shown by MDCT. The first group comprised 49 polytrauma patients; the second included 45 dead bodies undergoing multi-phase post-mortem CT-angiography (MPMCTA)...
November 28, 2016: International Journal of Legal Medicine
https://www.readbyqxmd.com/read/27882733/anomalous-origin-of-the-right-coronary-artery-first-familial-cases-in-asia
#10
Hideki Motomura, Mari Yokokawa, Hirofumi Fukunaga, Mari Nakagaki, Tomoyuki Hasuwa, Hiroyuki Moriuchi
Congenital coronary artery abnormalities may cause sudden death, particularly in athletes. Two siblings, aged 10 and 9 years, respectively, were diagnosed with anomalous origin of the right coronary artery on multi-detector computed tomography (MDCT). The right coronary artery arose from the left coronary cusp, and was wedged between the aorta and pulmonary artery. This was also noted on cardiac ultrasonography (UCG), but in general this might not be seen on electrocardiography at rest. Although the surgical indications are unclear in the case of unproven ischemia, early recognition of the condition may reduce risk of the cardiac events during exercise...
November 2016: Pediatrics International: Official Journal of the Japan Pediatric Society
https://www.readbyqxmd.com/read/27865676/bailout-intravenous-esmolol-for-heart-rate-control-in-cardiac-computed-tomography-angiography
#11
Sílvia Aguiar Rosa, Ruben Ramos, Hugo Marques, Rosana Santos, Cecília Leal, Helena Casado, Márcia Saraiva, Luísa Figueiredo, Rui Cruz Ferreira
OBJECTIVE: To evaluate the efficacy and safety of a heart rate (HR) reduction protocol using intravenous esmolol as bailout for failed oral metoprolol regimens in patients undergoing coronary computed tomography angiography (CCTA) with 64-slice multidetector computed tomography (64-MDCT). METHODS: Patients who underwent cardiac 64-MDCT in a single institution between 2011 and 2014 were analyzed. Those with HR above 60 beats per minute (bpm) on presentation received oral metoprolol (50-200 mg) at least one hour before CCTA...
December 2016: Portuguese Journal of Cardiology: An Official Journal of the Portuguese Society of Cardiology
https://www.readbyqxmd.com/read/27806106/voxel-based-sensitivity-of-flat-panel-ct-for-the-detection-of-intracranial-hemorrhage-comparison-to-multi-detector-ct
#12
Andreas M Frölich, Jan-Hendrik Buhk, Jens Fiehler, Andre Kemmling
OBJECTIVES: Flat-panel CT (FPCT) allows cross-sectional parenchymal, vascular and perfusion imaging within the angiography suite, which could greatly facilitate acute stroke management. We hypothesized that FPCT offers equal diagnostic accuracy compared to multi-detector CT (MDCT) as a primary tool to exclude intracranial hemorrhage. METHODS: 22 patients with intracranial hematomas who had both MDCT and FPCT performed within 24 hours were retrospectively identified...
2016: PloS One
https://www.readbyqxmd.com/read/27805446/assessment-of-left-ventricular-volume-and-function-in-healthy-dogs-by-use-of-one-two-and-three-dimensional-echocardiography-versus-multidetector-computed-tomography
#13
Katherine F Scollan, Susanne M Stieger-Vanegas, D David Sisson
OBJECTIVE To compare left ventricle (LV) volume and function variables obtained by use of 1-D, 2-D, and real-time 3-D echocardiography versus ECG-gated multidetector row CT (MDCT) angiography, which was considered the criterion-referenced standard. ANIMALS 6 healthy, purpose-bred dogs. PROCEDURES Dogs were anesthetized and administered a constant rate infusion of esmolol, and 1-D, 2-D, and 3-D echocardiography and ECG-gated, contrast-enhanced MDCT were performed. End-diastolic volume (EDV), end-systolic volume (ESV), stroke volume, and ejection fraction (EF) were calculated by use of the Teichholz method for 1-D echocardiography, single-plane and biplane modified Simpson method of disks (MOD) and area-length method for 2-D echocardiography, and real-time biplane echocardiography (RTBPE) and real-time 3-D echocardiography (RT3DE) for 3-D echocardiography...
November 2016: American Journal of Veterinary Research
https://www.readbyqxmd.com/read/27801658/radiation-exposure-and-contrast-agent-reduction-during-transcatheter-aortic-valve-implantation-an-ongoing-experience
#14
Davide Maccagni, Cosmo Godino, Azeem Latib, Morena Mancin, Alaide Chieffo, Alberto Margonato, Antonio Colombo
OBJECTIVES: To determine the patient radiation exposure and contrast agent variation during transcatheter aortic valve implantation (TAVI) procedures resulting from technological improvements. METHODS: TAVI procedures from January 2008 to July 2015 were analyzed in three different time periods: 1st period, when the angiography was equipped with an image intensifier technology; 2nd period, starting with the installation of a new angiography system with flat-panel detector (FPD) technology; and 3rd period, starting with the systematic use of preprocedural multidetector computed tomography (MDCT) to individualize optimal fluoroscopic projections for the aortic prosthesis implantation...
November 2016: Journal of Invasive Cardiology
https://www.readbyqxmd.com/read/27798447/prediction-of-vascular-invasion-using-a-3-point-scale-computed-tomography-grading-system-in-pancreatic-ductal-adenocarcinoma-correlation-with-surgery
#15
Lei Zhang, Zhui-Yang Zhang, Jian-Ming Ni, Bin Li, Fang-Ming Chen, Chun-Juan Jiang, Chun-Hong Hu
OBJECTIVE: The aim of this study was to evaluate the correlation between a 3-point scale multidetector computed tomography (MDCT) grading system and surgical exploration in predicting vascular invasion and resectability in patients with pancreatic ductal adenocarcinoma (PDA). METHODS: Fifty-five patients with surgical and pathologic confirmation of PDA were retrospectively analyzed by 3 radiologists independently. All patients had MDCT examination with multiplanar reformatted images, computed tomography (CT) angiography, and negative-contrast CT cholangiopancreatography (nCTCP)...
October 29, 2016: Journal of Computer Assisted Tomography
https://www.readbyqxmd.com/read/27796494/the-oblique-occipital-sinus-anatomical-study-using-bone-subtraction-3d-ct-venography
#16
Hwa Seon Shin, Dae Seob Choi, Hye Jin Baek, Ho Cheol Choi, Hye Young Choi, Mi Jung Park, Ji Eun Kim, Jeong Yeol Han, SungEun Park
BACKGROUND AND PURPOSE: An occipital sinus draining into the sigmoid sinus has been termed the oblique occipital sinus (OOS). The frequency, anatomical features, patterns, and relationship with the transverse sinus of the oblique occipital sinus were analyzed in this study. MATERIALS AND METHODS: The study included 1805 patients who underwent brain CT angiography during a 3-year period from 2013 to 2015. CT examinations were performed using a 64-slice MDCT system...
October 31, 2016: Surgical and Radiologic Anatomy: SRA
https://www.readbyqxmd.com/read/27780673/transluminal-attenuation-gradient-coronary-ct-angiography-on-a-320-mdct-volume-scanner-effect-of-scan-timing-coronary-artery-stenosis-and-cardiac-output-using-a-contrast-medium-flow-phantom
#17
Yoshinori Funama, Daisuke Utsunomiya, Seitaro Oda, Toshiaki Shimonobo, Takeshi Nakaura, Toshifumi Mukunoki, Masafumi Kidoh, Hideaki Yuki, Yasuyuki Yamashita
PURPOSE: Transluminal-attenuation-gradient (TAG) may reflect patient characteristics and physiological parameters. Furthermore, TAG may be affected by factors such as the CT scanner speed, scanning method, scan timing after contrast-medium (CM) injection, and the injection methods. The purpose of our study was to investigate quantitative TAG at different scan timing points after CM injection for coronary CT angiography. MATERIALS AND METHODS: Using a CM flow phantom and two types of connecting tube mimicking 0% and 70% coronary artery stenosis, we performed 320-detector volume scanning...
November 2016: Physica Medica: PM
https://www.readbyqxmd.com/read/27754037/os-13-03-high-upstroke-time-of-arterial-pulse-wave-is-an-independent-predictor-for-the-presence-of-coronary-artery-disease
#18
Toshihiro Shoji, Sho Okada, Yuji Ohno, Atsushi Nakagomi, Yoshihide Fujimoto, Yosihio Kobayashi
OBJECTIVE: Pulse wave velocity is a non-invasive method that is useful not only for estimating arterial stiffness but also screening cardiovascular events in the general population. Upstroke time (UT) and % mean artery pressure (% MAP) are novel, adjunctive indices for arterial stiffness that are derived from morphology analysis of the pulse wave during brachial-ankle pulse wave velocity (baPWV) measurement. Several studies have shown the association between UT and coronary artery calcification score as assessed by multi-detector computed tomography (MDCT)...
September 2016: Journal of Hypertension
https://www.readbyqxmd.com/read/27684852/preoperative-evaluation-value-of-aortic-arch-lesions-by-multidetector-computed-tomography-angiography-in-type-a-aortic-dissection
#19
Fang Huang, Qiang Chen, Qing-Quan Lai, Wen-Han Huang, Hong Wu, Wei-Cheng Li
The purpose of this study was to preoperatively evaluate the value of aortic arch lesions by multidetector computed tomography (MDCT) angiography in type A aortic dissection (AD).From January 2013 to December 2015, we enrolled 42 patients with type A AD who underwent MDCT angiography in our hospital. The institutional database of patients was retrospectively reviewed to identify MDCT angiography examinations for type A AD. Surgical corrections were conducted in all patients to confirm diagnostic accuracy.In this study, the diagnostic accuracy of MDCT angiography was 100% in all 42 patients...
September 2016: Medicine (Baltimore)
https://www.readbyqxmd.com/read/27642955/os-13-03-high-upstroke-time-of-arterial-pulse-wave-is-an-independent-predictor-for-the-presence-of-coronary-artery-disease
#20
Toshihiro Shoji, Sho Okada, Yuji Ohno, Atsushi Nakagomi, Yoshihide Fujimoto, Yosihio Kobayashi
OBJECTIVE: Pulse wave velocity is a non-invasive method that is useful not only for estimating arterial stiffness but also screening cardiovascular events in the general population. Upstroke time (UT) and % mean artery pressure (% MAP) are novel, adjunctive indices for arterial stiffness that are derived from morphology analysis of the pulse wave during brachial-ankle pulse wave velocity (baPWV) measurement. Several studies have shown the association between UT and coronary artery calcification score as assessed by multi-detector computed tomography (MDCT)...
September 2016: Journal of Hypertension
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