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https://www.readbyqxmd.com/read/28214228/coronary-artery-stent-evaluation-with-model-based-iterative-reconstruction-at-coronary-ct-angiography
#1
Fuminari Tatsugami, Toru Higaki, Hiroaki Sakane, Wataru Fukumoto, Yoko Kaichi, Makoto Iida, Yasutaka Baba, Masao Kiguchi, Yasuki Kihara, So Tsushima, Kazuo Awai
RATIONALE AND OBJECTIVES: This study aims to compare the image quality of coronary artery stent scans on computed tomography images reconstructed with forward projected model-based iterative reconstruction solution (FIRST) and adaptive iterative dose reduction 3D (AIDR 3D). MATERIALS AND METHODS: Coronary computed tomography angiography scans of 23 patients with 32 coronary stents were used. The images were reconstructed with AIDR 3D and FIRST. We generated computed tomography attenuation profiles across the stents and measured the width of the edge rise distance and the edge rise slope (ERS)...
February 14, 2017: Academic Radiology
https://www.readbyqxmd.com/read/28214139/accuracy-of-computed-tomography-angiography-to-identify-thin-cap-fibroatheroma-detected-by-optical-coherence-tomography
#2
Nobuo Tomizawa, Kodai Yamamoto, Shinichi Inoh, Takeshi Nojo, Sunao Nakamura
BACKGROUND: Thin-cap fibroatheroma (TCFA) is assumed to cause acute coronary syndromes. OBJECTIVE: To compare the accuracy of different models for diagnosing TCFA using parameters derived by CT, validated against optical coherence tomography (OCT). METHODS: One hundred twenty-nine plaques in 106 patients were analyzed using data acquired by 64-row CT with a reconstruction thickness of 0.67 mm and an increment of 0.33 mm. TCFA was defined by OCT as a plaque with lipid content in ≥2 quadrants and the thinnest part of the fibrous cap measuring ≤65 μm...
February 9, 2017: Journal of Cardiovascular Computed Tomography
https://www.readbyqxmd.com/read/28210769/preprocedural-risk-assessment-prior-to-ppvi-with-cmr-and-cardiac-ct
#3
Ladonna Malone, Brian Fonseca, Thomas Fagan, Jane Gralla, Neil Wilson, Micheal DiMaria, Uyen Truong, Lorna P Browne
Percutaneous pulmonary valve intervention (PPVI) is a less invasive and less costly approach to pulmonary valve replacement compared with the surgical alternative. Potential complications of PPVI include coronary compression and pulmonary arterial injury/rupture. The purpose of this study was to characterize the morphological risk factors for PPVI complication with cardiac MRI and cardiac CTA. A retrospective review of 88 PPVI procedures was performed. 44 patients had preprocedural cardiac MRIs or CTAs available for review...
February 16, 2017: Pediatric Cardiology
https://www.readbyqxmd.com/read/28210637/anomalous-origin-of-the-left-coronary-artery-from-the-pulmonary-artery-an-uncommon-coronary-anomaly-with-serious-implications-in-adulthood
#4
Venkat Gangadharan, Kamesh Sivagnanam, Ghulam Murtaza, Michael Ponders, Otto Teixeira, Timir Paul
A 36-year-old woman was seen with complaints of exertional chest pain and shortness of breath. Her medical history included atrial fibrillation and diabetes. Physical examination was unremarkable except for an irregular cardiac rhythm. Myocardial perfusion imaging revealed the presence of a large area of infarction involving the entire anterior and apical walls and part of the anteroseptal wall with minimal periinfarct ischemia. Computed tomography coronary angiogram revealed an anomalous left main coronary artery arising from the main pulmonary artery...
January 2017: Journal of Investigative Medicine High Impact Case Reports
https://www.readbyqxmd.com/read/28209366/quantifying-aortic-valve-calcification-using-coronary-computed-tomography-angiography
#5
Abdulrahman M Alqahtani, Kevin E Boczar, Vinay Kansal, Kwan Chan, Girish Dwivedi, Benjamin J W Chow
INTRODUCTION: Aortic valve calcification (AVC) has been associated with major adverse cardiovascular events and all-cause mortality. We sought to develop and validate a method to quantify AVC using coronary CT angiography (CTA). METHODS: Of 59 patients who underwent both non-contrast and contrast enhanced coronary CTA, 25 patients served as the derivation cohort and 34 patients served as the validation cohort. For non-contrast enhanced CT, quantification of AVC was performed using the Agatston method for coronary artery calcification (CAC)...
January 30, 2017: Journal of Cardiovascular Computed Tomography
https://www.readbyqxmd.com/read/28208116/factors-determining-left-main-coronary-artery-luminal-area
#6
Konstantinos Dean Boudoulas, Peter M Bittenbender, Haikady N Nagaraja, Omar Kahaly, Jennifer A Dickerson, Subha V Raman, Ernest L Mazzaferri, Charles A Bush
BACKGROUND: A certain minimal luminal cross-sectional area has been traditionally used in clinical practice as a cut-off value to determine severity of left main coronary artery (LMCA) stenosis. The severity of stenosis, however, depends on the baseline luminal area (ie, area prior to stenosis), which may vary among individuals. The present study was undertaken to define normal LMCA luminal area using current technology in vivo. METHODS: LMCA luminal area was determined using multislice computed tomography coronary angiography...
February 15, 2017: Journal of Invasive Cardiology
https://www.readbyqxmd.com/read/28207527/zhibitai-and-low-dose-atorvastatin-reduce-blood-lipids-and-inflammation-in-patients-with-coronary-artery-disease
#7
Yuhong Zhao, Ran Peng, Wang Zhao, Qiong Liu, Yuan Guo, Shuiping Zhao, Danyan Xu
BACKGROUND: Atorvastatin decreases blood lipids but is associated with side effects. Zhibitai is a traditional Chinese medicine used to treat blood lipid disorders. The objective of this study is to evaluate the lipid-lowering effect, antiinflammatory effect, and adverse events of zhibitai combined to atorvastatin in patients with coronary heart diseases (CHDs). METHODS: Patients with CHD (n = 150) were randomized to: zhibitai 480 mg + atorvastatin 10 mg (ZA10 group), atorvastatin 20 mg (A20 group), and atorvastatin 40 mg (A40 group)...
February 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/28205113/cardiac-pet-ct-with-rb-82-optimization-of-image-acquisition-and-reconstruction-parameters
#8
P Chilra, S Gnesin, G Allenbach, M Monteiro, J O Prior, L Vieira, J A Pires Jorge
BACKGROUND: Our aim was to characterize the influence of time-of-flight (TOF) and point spread function (PSF) recovery corrections, as well as ordered subset expectation maximization (OSEM) reconstruction parameters, in (82)Rb PET/CT quantification of myocardial blood flow (MBF) and myocardial flow reserve (MFR). Rest and stress list-mode dynamic (82)Rb PET acquisition data from 10 patients without myocardial flow defects and 10 patients with myocardial blood flow defects were reconstructed retrospectively...
December 2017: EJNMMI Physics
https://www.readbyqxmd.com/read/28205072/negative-predictive-value-of-stress-myocardial-perfusion-imaging-and-coronary-computed-tomography-angiography-a-meta-analysis
#9
Roberta Green, Valeria Cantoni, Mario Petretta, Wanda Acampa, Mariarosaria Panico, Pietro Buongiorno, Giorgio Punzo, Marco Salvatore, Alberto Cuocolo
BACKGROUND: Comparing the prognostic value of a negative finding by stress single-photon emission computed tomography myocardial perfusion imaging (MPI) and coronary computed tomography angiography (CCTA) may be useful to evaluate how better identify low-risk patients. We performed a meta-analysis to compare the long-term negative predictive value (NPV) of normal stress MPI and normal CCTA in subjects with suspected coronary artery disease (CAD). METHODS AND RESULTS: Studies published between January 2000 and November 2016 were identified by database search...
February 15, 2017: Journal of Nuclear Cardiology: Official Publication of the American Society of Nuclear Cardiology
https://www.readbyqxmd.com/read/28203068/ectopic-fat-accumulation-in-patients-with-copd-an-eclipse-substudy
#10
Mickaël Martin, Natalie Almeras, Jean-Pierre Després, Harvey O Coxson, George R Washko, Isabelle Vivodtzev, Emiel Fm Wouters, Erica Rutten, Michelle C Williams, John T Murchison, William MacNee, Don D Sin, François Maltais
BACKGROUND: Obesity is increasingly associated with COPD, but little is known about the prevalence of ectopic fat accumulation in COPD and whether this can possibly be associated with poor clinical outcomes and comorbidities. The Evaluation of COPD Longitudinally to Identify Predictive Surrogate Endpoints (ECLIPSE) substudy tested the hypothesis that COPD is associated with increased ectopic fat accumulation and that this would be associated with COPD-related outcomes and comorbidities...
2017: International Journal of Chronic Obstructive Pulmonary Disease
https://www.readbyqxmd.com/read/28202259/coronary-artery-calcium-score-as-a-predictor-for-incident-stroke-systematic-review-and-meta-analysis
#11
Kongkiat Chaikriangkrai, Hye Yeon Jhun, Ghanshyam Palamaner Subash Shantha, Aref Bin Abdulhak, Gardar Sigurdsson, Faisal Nabi, John J Mahmarian, Su Min Chang
BACKGROUND: Coronary artery calcium score (CACS) is a well-established test for risk stratifying asymptomatic patients for overall cardiovascular or coronary events. However; the prognostic value for incident stroke remains controversial. The objective of this study was to investigate the predictive value of CACS obtained by non-contrast electrocardiogram-gated computed tomography for incident stroke. METHODS: We searched PubMed, EMBASE, Cochrane databases for prospective longitudinal studies of CACS which reported the incidence of stroke...
February 8, 2017: International Journal of Cardiology
https://www.readbyqxmd.com/read/28202247/radiological-characteristics-of-atrial-myxoma-in-cardiac-computed-tomography
#12
Kawa Haji, Arthur Nasis
BACKGROUND: Although the primary role of Cardiac Computed Tomography (CCT) is assessment of the coronary arteries, the technique also allows detailed examination of cardiac structures and other cardiac pathologies including cardiac myxoma. However, limited data exists regarding the CCT characteristics of cardiac myxoma. OBJECTIVE: To describe the radiological characteristics of a series of cardiac myxomas in CCT. METHODS: We retrospectively identified all patients at our tertiary urban referral centre with cardiac myxoma on CCT over a seven-year period between July 2008 and July 2015...
February 7, 2017: Journal of Cardiovascular Computed Tomography
https://www.readbyqxmd.com/read/28202246/analysis-of-myocardial-perfusion-parameters-in-an-ex-vivo-porcine-heart-model-using-third-generation-dual-source-ct
#13
Gert Jan Pelgrim, Taylor M Duguay, J Marco A Stijnen, Akos Varga-Szemes, Sjoerd Van Tuijl, U Joseph Schoepf, Matthijs Oudkerk, Rozemarijn Vliegenthart
PURPOSE: To evaluate the relationship between fractional flow reserve (FFR)-determined coronary artery stenosis severity and myocardial perfusion parameters derived from dynamic myocardial CT perfusion imaging (CTP) in an ex-vivo porcine heart model. METHODS: Six porcine hearts were perfused according to Langendorff. Circulatory parameters such as arterial blood flow (ABF) (L/min), mean arterial pressure (MAP) (mmHg) and heart rate (bpm) were monitored. Using an inflatable cuff and monitored via a pressure wire, coronary artery stenoses of different FFR grades were created (no stenosis, FFR = 0...
February 3, 2017: Journal of Cardiovascular Computed Tomography
https://www.readbyqxmd.com/read/28202051/variability-of-radiation-doses-of-cardiac-diagnostic-imaging-tests-the-radio-evinci-study-radiationdose-subproject-of-the-evinci-study
#14
Clara Carpeggiani, Eugenio Picano, Marco Brambilla, Claudio Michelassi, Juhani Knuuti, Philipp Kauffman, S Richard Underwood, Danilo Neglia
BACKGROUND: Patients with coronary artery disease can accumulate significant radiation dose through repeated exposures to coronary computed tomographic angiography, myocardial perfusion imaging with single photon emission computed tomography or positron emission tomography, and to invasive coronary angiography. Aim of the study was to audit radiation doses of coronary computed tomographic angiography, single photon emission computed tomography, positron emission tomography and invasive coronary angiography in patients enrolled in the prospective, randomized, multi-centre European study-EVINCI (Evaluation of Integrated Cardiac Imaging for the Detection and Characterization of Ischemic Heart Disease)...
February 16, 2017: BMC Cardiovascular Disorders
https://www.readbyqxmd.com/read/28200212/head-to-head-comparison-of-adaptive-statistical-and-model-based-iterative-reconstruction-algorithms-for-submillisievert-coronary-ct-angiography
#15
Dominik C Benz, Tobias A Fuchs, Christoph Gräni, Annina A Studer Bruengger, Olivier F Clerc, Fran Mikulicic, Michael Messerli, Julia Stehli, Mathias Possner, Aju P Pazhenkottil, Oliver Gaemperli, Philipp A Kaufmann, Ronny R Buechel
No abstract text is available yet for this article.
February 15, 2017: European Heart Journal Cardiovascular Imaging
https://www.readbyqxmd.com/read/28199464/identification-of-patients-with-stable-chest-pain-deriving-minimal-value-from-noninvasive-testing-the-promise-minimal-risk-tool-a-secondary-analysis-of-a-randomized-clinical-trial
#16
Christopher B Fordyce, Pamela S Douglas, Rhonda S Roberts, Udo Hoffmann, Hussein R Al-Khalidi, Manesh R Patel, Christopher B Granger, John Kostis, Daniel B Mark, Kerry L Lee, James E Udelson
Importance: Guidelines recommend noninvasive testing for patients with stable chest pain, although many subsequently have normal test results and no adverse clinical events. Objective: To describe a risk tool developed to use only pretest clinical data to identify patients with chest pain with normal coronary arteries and no clinical events during follow-up (minimal-risk cohort). Design, Setting, and Participants: This secondary analysis of a randomized, pragmatic comparative effectiveness trial (Prospective Multicenter Imaging Study for Evaluation of Chest Pain [PROMISE]) includes stable, symptomatic outpatients without known coronary artery disease referred for noninvasive testing at 193 sites in North America...
February 15, 2017: JAMA Cardiology
https://www.readbyqxmd.com/read/28199411/cortical-porosity-not-superior-to-conventional-densitometry-in-identifying-hemodialysis-patients-with-fragility-fracture
#17
Bernhard Bielesz, Janina M Patsch, Lukas Fischer, Marija Bojic, Wolfgang Winnicki, Michael Weber, Daniel Cejka
Hemodialysis (HD) patients face increased fracture risk, which is further associated with elevated risk of hospitalization and mortality. High-resolution peripheral computed tomography (HR-pQCT) has advanced our understanding of bone disease in chronic kidney disease by characterizing distinct changes in both the cortical and trabecular compartments. Increased cortical porosity (Ct.Po) has been shown to be associated with fracture in patients with osteopenia or in postmenopausal diabetic women. We tested whether the degree of Ct...
2017: PloS One
https://www.readbyqxmd.com/read/28198536/prevalence-of-risk-factors-and-asymptomatic-carotid-atherosclerosis-in-diabetic-patients-screened-for-silent-myocardial-ischemia-by-spect-myocardial-imaging
#18
Irena Peovska Mitevska, Natalija Baneva, Marijan Bosevski, Elizabeta Srbinovska Kostovska
BACKGROUND: The aim of the study was to evaluate whether there is any association between myocardial ischemia, common risk factors and carotid artery ultrasound parameters in asymptomatic type 2 diabetic (DMT2) patients. MATERIAL AND METHODS: 60 asymptomatic DMT2 patients (pts) without known coronary artery disease (CAD) underwent one day rest Dypiridamole stress Tc-99m sestamibi single photon emission computed tomography myocardial perfusion scintigraphy (MPS)...
2017: Nuclear Medicine Review. Central & Eastern Europe
https://www.readbyqxmd.com/read/28196817/comparison-of-carotid-plaque-score-and-coronary-artery-calcium-score-for-predicting-cardiovascular-disease-events-the-multi-ethnic-study-of-atherosclerosis
#19
Adam D Gepner, Rebekah Young, Joseph A Delaney, Matthew J Budoff, Joseph F Polak, Michael J Blaha, Wendy S Post, Erin D Michos, Joel Kaufman, James H Stein
BACKGROUND: Coronary artery calcium (CAC) predicts coronary heart disease (CHD) events better than carotid wall plaque presence; however, differences in the utility of CAC burden and carotid plaque burden across the spectrum of cardiovascular disease (CVD) events is unknown. METHODS AND RESULTS: CVD, CHD and stroke/transient ischemic attack (TIA) events were evaluated prospectively in a multiethnic cohort without CVD at baseline. Carotid plaque score was determined by the number of ultrasound-detected plaques in the common, bifurcation, and internal carotid artery segments...
February 14, 2017: Journal of the American Heart Association
https://www.readbyqxmd.com/read/28196758/evaluation-of-image-quality-of-coronary-artery-plaque-with-rapid-kvp-switching-dual-energy-ct
#20
Yasutoshi Ohta, Shinichiro Kitao, Tomomi Watanabe, Junichi Kishimoto, Kazuhiro Yamamoto, Toshihide Ogawa
We evaluated the virtual monochromatic imaging (VMI) energy levels that maximize image quality of each coronary plaque component in dual-energy computed tomography angiography in 495 coronary segments (45 for each energy level). Maximal signal-to-noise ratios were different for plaque, lumen, fat, and surrounding tissue (p<0.05). Maximal contrast-to-noise ratios were observed at 70keV for calcified plaque (CP), non-calcified plaque (NCP), and fat in comparison with the lumen (p<0.05), and 70keV and 120keV for NCP in comparison with fat (p=0...
February 1, 2017: Clinical Imaging
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