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Ct calcium score

Annemarie M den Harder, Jelmer M Wolterink, Martin J Willemink, Arnold M R Schilham, Pim A de Jong, Ricardo P J Budde, Hendrik M Nathoe, Ivana Išgum, Tim Leiner
PURPOSE: To determine the effect of model-based iterative reconstruction (IR) on coronary calcium quantification using different submillisievert CT acquisition protocols. METHODS: Twenty-eight patients received a clinically indicated non contrast-enhanced cardiac CT. After the routine dose acquisition, low-dose acquisitions were performed with 60%, 40% and 20% of the routine dose mAs. Images were reconstructed with filtered back projection (FBP), hybrid IR (HIR) and model-based IR (MIR) and Agatston scores, calcium volumes and calcium mass scores were determined...
November 2016: European Journal of Radiology
Takayoshi Yamaguchi, Katsuhiro Ichikawa, Daichi Takahashi, Teppei Sugaya, Jungo Furuya, Keiichi Igarashi
RATIONALE AND OBJECTIVES: We have developed a new contrast enhancement protocol for subtraction coronary computed tomography (SCCTA) requiring a short breath-holding time. In the protocol, test and main boluses were sequentially and automatically injected, and correct timings for pre-contrast and contrast-enhanced scans for main bolus were automatically determined only by the test bolus tracking. Combined with a fixed short main bolus injection for 7 seconds, the breath-holding time was shortened as possible...
October 17, 2016: Academic Radiology
Ricardo Ladeiras-Lopes, Francisco Sampaio, Nuno Bettencourt, Ricardo Fontes-Carvalho, Nuno Ferreira, Adelino Leite-Moreira, Vasco Gama
INTRODUCTION AND OBJECTIVES: Obesity is an important cardiovascular risk factor and the location of fat deposits seems to be an important determinant of its metabolic impact. Visceral adipose tissue (VAT) exerts a harmful effect on metabolic homeostasis, but few longitudinal studies have evaluated the prognostic impact of the ratio of VAT to subcutaneous adipose tissue (SAT). This study aimed to evaluate whether the VAT/SAT ratio was associated with all-cause mortality and cardiac events...
October 17, 2016: Revista Española de Cardiología
Lea Azour, Michael A Kadoch, Thomas J Ward, Corey D Eber, Adam H Jacobi
BACKGROUND: Coronary artery calcium (CAC) is often identified on routine chest computed tomography (CT). The purpose of our study was to evaluate whether ordinal scoring of CAC on non-gated, routine chest CT is an accurate predictor of Agatston score ranges in a community-based population, and in particular to determine the accuracy of an ordinal score of zero on routine chest CT. METHODS: Two thoracic radiologists reviewed consecutive same-day ECG-gated and routine non-gated chest CT scans of 222 individuals...
October 5, 2016: Journal of Cardiovascular Computed Tomography
Michael Messerli, Fabian Rengier, Lotus Desbiolles, Niklas F Ehl, Ralf W Bauer, Sebastian Leschka, Hatem Alkadhi, Simon Wildermuth, Claas P Nähle
RATIONALE AND OBJECTIVES: To evaluate the influence of advanced modeled iterative reconstruction (ADMIRE) on the coronary artery calcium (CAC) scores by computed tomography (CT). MATERIALS AND METHODS: Sixty patients underwent CAC imaging with dual-source 192-slice CT. Agatston, volume and mass score were calculated from filtered back projection (FBP) and iterative reconstructions with different levels of ADMIRE. Friedman test and Wilcoxon rank sum test were used for multiple comparisons of CAC values and the difference ratio among different ADMIRE groups using FBP as reference...
October 11, 2016: Academic Radiology
Adam Bernheim, William F Auffermann, Arthur E Stillman
No abstract text is available yet for this article.
October 4, 2016: Journal of the American College of Radiology: JACR
Hwa Seon Shin, Mi Jung Park, Kyung Nyeo Jeon, Jae Min Cho, Kyung Soo Bae, Dae Seob Choi, Jae Boem Na, Ho Cheol Choi, Hye Young Choi, Ji Eun Kim, Soo Bueum Cho, Sung Eun Park
BACKGROUND: Until now, there has been no study on the relationship between the calcification of the lower extremity arteries and significant coronary arterial disease (CAD). OBJECTIVES: To evaluate whether lower extremity calcium scores (LECS) are associated with CAD and whether this can predict multivessel-CAD in patients with peripheral arterial disease (PAD). PATIENTS AND METHODS: We retrospectively enrolled 103 PAD patients without cardiac symptoms or known CAD...
April 2016: Iranian Journal of Radiology: a Quarterly Journal Published By the Iranian Radiological Society
Vidhya Kumar, James K Min, Xin He, Subha V Raman
Dual-energy computed tomography (DECT) improves material and tissue characterization compared with single-energy CT; we sought to validate coronary calcium quantification in advancing cardiovascular DECT. In an anthropomorphic phantom, agreement between measurements was excellent, and Bland-Altman analysis demonstrated minimal bias. Compared with the known calcium mass for each phantom, calcium mass by DECT was highly accurate. Noncontrast DECT yields accurate calcium measures and warrants consideration in cardiac protocols for additional tissue characterizations...
September 27, 2016: Journal of Computer Assisted Tomography
Reza Hanifehpour, Marzieh Motevalli, Hossein Ghanaati, Mona Shahriari, Mounes Aliyari Ghasabeh
BACKGROUND: Coronary artery calcium score (CACS) is a quantitative assessment of calcifications and an established predictor of cardiovascular events. OBJECTIVES: In this study, we evaluated the diagnostic accuracy, negative predictive value (NPV), positive predictive value (PPV), specificity and sensitivity of CACS less than 100 in predicting significant coronary artery stenosis in patients with risk of coronary artery disease (CAD) in a vessel-based analysis. PATIENTS AND METHODS: A cross sectional study was carried out on a study population of 2527 consecutive stable patients with symptoms suggestive of CAD who were referred for coronary computed tomographic angiography (CCTA)...
April 2016: Iranian Journal of Radiology: a Quarterly Journal Published By the Iranian Radiological Society
Edmund K Kerut, Filip To, Michael Turner, James McKinnie, Thomas Giles
Quantification of computed tomography (CT) noise helps in determination of radiation dosage requirements for adequate image quality. Clinical methods used include calculation of the standard deviation (SD) of a selected region of interest (ROI). In industry, wavelet decomposition has been used for image compression while removing high-frequency noise. We evaluated a cohort of 74 consecutive patients referred for coronary artery calcium scoring and quantitated noise within a 16×16 ROI in the ascending aorta using the traditional SD method and also using a two-dimensional dyadic wavelet decomposition method...
September 28, 2016: Echocardiography
Jacobo Kirsch, Felipe Martinez, David Lopez, Gian M Novaro, Craig R Asher
Coronary artery calcification (CAC) is a known risk factor for adverse outcomes in the general population and in patients with coronary artery disease. We performed a survey of United States radiologists to evaluate the trends in reporting the presence or absence of CAC on NCCT examinations. An 11 multiple-choice questionnaire was distributed to members of the American College of Radiology, and 530 members participated in the study. Eighty-seven percent of the analyzed group report the presence of CAC on standard CT scans of the chest, and approximately half them (52 %) use a qualitative modifier...
September 27, 2016: International Journal of Cardiovascular Imaging
Qin Li, Songtao Liu, Kyle J Myers, Marios A Gavrielides, Rongping Zeng, Berkman Sahiner, Nicholas Petrick
RATIONALE AND OBJECTIVES: Different computed tomography imaging protocols and patient characteristics can impact the accuracy and precision of the calcium score and may lead to inconsistent patient treatment recommendations. The aim of this work was to determine the impact of reconstruction algorithm and gender characteristics on coronary artery calcium scoring based on a phantom study using computed tomography. MATERIALS AND METHODS: Four synthetic heart vessels with vessel diameters corresponding to female and male left main and left circumflex arteries containing calcification-mimicking materials (200-1000 HU) were inserted into a thorax phantom and were scanned with and without female breast plates (male and female phantoms, respectively)...
September 22, 2016: Academic Radiology
S Sho, M Yilma, M W Yeh, M Livhits, J X Wu, J K Hoang, A R Sepahdari
BACKGROUND AND PURPOSE: Patients with multigland primary hyperparathyroidism are at higher risk for missed lesions on imaging and failed parathyroidectomy. The purpose of this study was to prospectively validate the ability of previously derived predictive score systems, the composite multigland disease score, and the multiphase multidetector contrast-enhanced CT (4D-CT) composite multigland disease score, to identify patients with a high likelihood of multigland disease. MATERIALS AND METHODS: This was a prospective study of 71 patients with primary hyperparathyroidism who underwent 4D-CT and successful parathyroidectomy...
September 22, 2016: AJNR. American Journal of Neuroradiology
L T Burgers, W K Redekop, M J Al, S K Lhachimi, N Armstrong, S Walker, C Rothery, M Westwood, J L Severens
AIMS: New generation dual-source coronary CT (NGCCT) scanners with more than 64 slices were evaluated for patients with (known) or suspected of coronary artery disease (CAD) who are difficult to image: obese, coronary calcium score > 400, arrhythmias, previous revascularization, heart rate > 65 beats per minute, and intolerance of betablocker. A cost-effectiveness analysis of NGCCT compared with invasive coronary angiography (ICA) was performed for these difficult-to-image patients for England and Wales...
September 20, 2016: European Journal of Health Economics: HEPAC: Health Economics in Prevention and Care
Timothy R G Cartlidge, Tania A Pawade, Marc R Dweck
No abstract text is available yet for this article.
September 19, 2016: Heart: Official Journal of the British Cardiac Society
Michelle S Park, Corrilynn O Hileman, Abdus Sattar, Robert Gilkeson, Grace A McComsey
BACKGROUND: Chest imaging is performed for a variety of reasons in HIV-infected adults. There are limited data on the prevalence of incidental findings, progression of these findings over time and the relationship with inflammation in antiretroviral therapy (ART)-treated HIV-infected adults. METHODS: This study utilized data from a randomized clinical trial of rosuvastatin in HIV-infected adults on ART. Incidental findings were reported from chest computed tomography (CT) scans obtained for coronary artery calcium score at entry, week 48 and 96...
September 20, 2016: Antiviral Therapy
Ci He, Peng Wang, Fei-Zhou Du, Jian-Wen Gu, Zhi-Gang Yang
OBJECTIVE: To evaluate the epidemiological and morphological characteristics of coronary plaque in diabetic patients with symptomatic coronary heart disease (CHD) by dual-source computed tomography (DSCT). MATERIALS AND METHODS: From June 2013 to December 2014, 267 consecutive patients with type 2 diabetes mellitus were examined by DSCT. Plaque type, distribution, as well as extent and obstructive characteristics were determined for each segment. RESULTS: A total of 225 patients were included in the final study...
September 14, 2016: Current Vascular Pharmacology
Damiano Caruso, Carlo N De Cecco, U Joseph Schoepf, Lloyd M Felmly, Akos Varga-Szemes, Stefanie Mangold, Christian Canstein, Thomas Allmendinger, Stephen R Fuller, Andrea Laghi, Julian L Wichmann
RATIONALE AND OBJECTIVES: Iterative reconstruction (IR) computed tomography (CT) techniques allow for radiation dose reduction while maintaining image quality. However, CT coronary artery calcium (CAC) scores may be influenced by certain IR algorithms. The aim of our study is to identify suitable correction factors to ensure consistency between IR and filtered back projection (FBP)-based CAC scoring. MATERIAL AND METHODS: A phantom study was performed to derive suitable correction factors for CAC scores and volume (VOL) values with advanced modeled iterative reconstruction (or ADMIRE) strength level 3 (ADM3) and 5 (ADM5) vs FBP...
September 7, 2016: Academic Radiology
Dong Hyun Sinn, Danbee Kang, Yoosoo Chang, Seungho Ryu, Seonhye Gu, Hyunkyoung Kim, Donghyeong Seong, Soo Jin Cho, Byoung-Kee Yi, Hyung-Doo Park, Seung Woon Paik, Young Bin Song, Mariana Lazo, Joao A C Lima, Eliseo Guallar, Juhee Cho, Geum-Youn Gwak
BACKGROUND AND AIM: Non-alcoholic fatty liver disease (NAFLD), a hepatic manifestation of the metabolic syndrome, was associated with subclinical atherosclerosis in many cross-sectional studies, but the prospective association between NAFLD and the progression of atherosclerosis has not been evaluated. This study was conducted to evaluate the association between NAFLD and the progression of coronary atherosclerosis. METHODS: This retrospective cohort study included 4731 adult men and women with no history of cardiovascular disease (CVD), liver disease or cancer at baseline who participated in a repeated regular health screening examination between 2004 and 2013...
September 6, 2016: Gut
Andrew D Choi, Eric S Leifer, Jeannie Yu, Sujata M Shanbhag, Kathie Bronson, Andrew E Arai, Marcus Y Chen
BACKGROUND: Coronary artery calcium (CAC) predicts coronary heart disease events and is important for individualized cardiac risk assessment. This report assesses the interscan variability of CT for coronary calcium quantification using image acquisition with standard and reduced radiation dose protocols and whether the use of reduced radiation dose acquisition with iterative reconstruction (IR; "reduced-dose/IR ") allows for similar image quality and reproducibility when compared to standard radiation dose acquisition with filtered back projection (FBP; "standard-dose/FBP") on 320-detector row computed tomography (320-CT)...
September 2016: Journal of Cardiovascular Computed Tomography
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