scholarly journals Quantitative Assessment of Image Quality in 64-slice-computed Tomography of Coronary Arteries in Subjects Undergoing Screening for Coronary Artery Disease

2010 ◽  
Vol 26 (1) ◽  
pp. 21-29
Author(s):  
Li-Hwa Yang ◽  
Ding-Kwo Wu ◽  
Chiao-Yun Chen ◽  
Gin-Chung Liu ◽  
Tsyh-Jyi Hsieh ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Coronary Artery Disease ◽  
Coronary Artery ◽  
Image Quality ◽  
Coronary Arteries ◽  
Quantitative Assessment ◽  
Artery Disease

scholarly journals Prognostic value of normal and non-obstructive coronary artery disease based on CT angiography findings. A 12 month follow up study

2019 ◽  
Vol 11 (4) ◽  
pp. 318-321
Author(s):  
Amirreza Sajjadieh Khajouei ◽  
Atoosa Adibi ◽  
Zahra Maghsodi ◽  
Majid Nejati ◽  
Mohaddeseh Behjati
Keyword(s):  
Computed Tomography ◽  
Coronary Artery Disease ◽  
Coronary Artery ◽  
Coronary Arteries ◽  
Prognostic Value ◽  
Significant Finding ◽  
Cardiac Events ◽  
Luminal Narrowing ◽  
Artery Disease

Introduction: The advent of multi-slice computed tomography (CT) technology has provided a new promising tool for non-invasive assessment of the coronary arteries. However, as the prognostic outcome of patients with normal or non-significant finding on computed tomography coronary angiography (CTCA) is not well-known, this study was aimed to determine the prognostic value of CTCA in patients with either normal or non-significant CTCA findings.|<br /> Methods: This retrospective cohort study was performed on patients who were referred for CTCA to the hospital. 527 patients with known or suspected coronary artery disease (CAD), who had undergone CTCA within one year were enrolled. Among them, data of 465 patients who had normal (no stenosis, n=362) or non-significant CTCA findings (stenosis <50% of luminal narrowing, n=103) were analyzed and prevalence of cardiac risk factors and major adverse cardiac events (MACE) were compared between these groups. In addition, a correlation between these factors and the number of involved coronary arteries was also determined. <br /> Results: After a mean follow-up duration of 13.11±4.63 months, all cases were alive except for three patients who died by non-cardiac events. Prevalence of MACE was 0% and 3% in normal CTCA group and non-significant groups, respectively. There was no correlation found between the number of involved coronary arteries and the prevalence of MACE (P = 0.57). <br /> Conclusion: A normal CTCA could be associated with extremely low risk of MACE over the first year after the initial imaging, whereas non-significant obstruction in coronary arteries may be associated with a slightly higher risk of MACE.

P2719The impact of “diseased only coronary artery” invasive diagnostics strategy on contrast and radiation dose in patients with coronary artery disease following coronary computed tomography angiography

2019 ◽  
Vol 40 (Supplement_1) ◽  
Author(s):  
M A Debski ◽  
M Kruk ◽  
S Bujak ◽  
Z Dzielinska ◽  
M Demkow ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Coronary Artery Disease ◽  
Coronary Artery ◽  
Radiation Dose ◽  
Contrast Media ◽  
Coronary Arteries ◽  
Coronary Computed Tomography Angiography ◽  
Contrast Volume ◽  
Diseased Vessel ◽  
Artery Disease

Abstract Background Coronary computed tomography angiography (CTA) has high diagnostic accuracy in ruling out significant stenosis of coronary arteries in patients with intermediate probability of coronary artery disease. Based on CTA result, some patients are scheduled for invasive coronary angiography (ICA). As no specyfic guidelines exist for such situations, during ICA contrast media is routinely injected into both coronary arteries, irrespectively of CTA result. Conceivably, patients scheduled for ICA with one vessel disease may benefit from invasive interrogation limited to the diseased vessel only, presumably resulting in less contrast, lower radiation dose and less complications related to catheterization. Purpose The aim of this study was to analyse the potential trade-off between the benefits and costs of a “diseased-vessel-only” (>50% DS in CTA) invasive diagnostic approach in patients undergoing ICA following coronary CTA, as compared to the traditional “total ICA” (including both arteries regardless of CTA result) approach. The potential benefits were defined as contrast and radiation doses reduction during ICA and the costs were defined as missing significant coronary stenosis. Methods In 85 patients who underwent CTA and subsequently ICA we precisely measured contrast volume and radiation dose used to visualise each vessel during ICA. Then we proposed excluding a vessel (either left or right coronary artery) without >50% diameter stenosis in CTA from ICA, and studied how it would affect ICA contrast and radiation values. DS in CTA and ICA were assessed quantitatively. Results CTA sensitivity, specificity, positive predictive value and negative predictive value in diagnosing >50%DS as assessed by ICA were 95.2%, 96.2%, 91.6% and 97.9%, respectively. Applying <50% DS in CTA as a threshold not to visualise the artery during ICA would reduce contrast volume by 47% (27ml, Fig. 1) and radiation dose by 51% (3.14mSv, Fig.2, both p<0.0001). No significant (>50%DS in ICA) stenosis would be missed by CTA. Figures 1 and 2 Conclusion These real-world data support the concept that vessels with <50%DS in CTA do not need to be visualised during ICA. Such approach would result in significant reduction in contrast media volume and patient's exposure to radiation during ICA, without underdiagnosing any of the patients.

scholarly journals Low-Dose Radiation Advances in Coronary Computed Tomography Angiography in the Diagnosis of Coronary Artery Disease

2019 ◽  
Vol 15 (4) ◽  
pp. 304-315 ◽  
Author(s):  
Caryl E. Richards ◽  
Daniel R. Obaid
Keyword(s):  
Computed Tomography ◽  
Coronary Artery Disease ◽  
Coronary Artery ◽  
Image Quality ◽  
Computed Tomography Angiography ◽  
Coronary Computed Tomography Angiography ◽  
Radiation Doses ◽  
Coronary Computed Tomography ◽  
Dose Saving ◽  
Artery Disease

Background: Coronary computed tomography angiography (CCTA) is now widely used in the diagnosis of coronary artery disease since it is a rapid, minimally invasive test with a diagnostic accuracy comparable to coronary angiography. However, to meet demands for increasing spatial and temporal resolution, higher x-ray radiation doses are required to circumvent the resulting increase in image noise. Exposure to high doses of ionizing radiation with CT imaging is a major health concern due to the potential risk of radiation-associated malignancy. Given its increasing use, a number of dose saving algorithms have been implemented to CCTA to minimize radiation exposure to “as low as reasonably achievable (ALARA)” without compromising diagnostic image quality. Objective: The purpose of this review is to outline the most recent advances and current status of dose saving techniques in CCTA. Methods: PubMed, Medline, EMBASE and Scholar databases were searched to identify feasibility studies, clinical trials, and technology guidelines on the technical advances in CT scanner hardware and reconstruction software. Results: Sub-millisievert (mSv) radiation doses have been reported for CCTA due to a combination of strategies such as prospective electrocardiogram-gating, high-pitch helical acquisition, tube current modulation, tube voltage reduction, heart rate reduction, and the most recent novel adaptive iterative reconstruction algorithms. Conclusion: Advances in radiation dose reduction without loss of image quality justify the use of CCTA as a non-invasive alternative to coronary catheterization in the diagnosis of coronary artery disease.

scholarly journals Computed tomography angiography of the coronary arteries: major findings in the clinical routine of a general hospital

2021 ◽  
Vol 54 (4) ◽  
pp. 261-264
Author(s):  
Rafael Mansur Souto ◽  
Alair Augusto Sarmet Moreira Damas dos Santos ◽  
Marcelo Souto Nacif
Keyword(s):  
Computed Tomography ◽  
Coronary Artery Disease ◽  
Coronary Artery ◽  
General Hospital ◽  
Coronary Arteries ◽  
Pulmonary Nodules ◽  
Accurate Method ◽  
Coronary Computed Tomography ◽  
Atheromatous Plaques ◽  
Artery Disease

Abstract Almost two decades ago, it became possible to use coronary computed tomography for the noninvasive assessment of the coronary arteries. That is an extremely accurate method for detecting or excluding coronary artery disease, even the subclinical forms. This pictorial essay aims to show the main imaging findings in 47 coronary computed tomography scans acquired at a general hospital between January 2014 and June 2018. The most common findings were atheromatous plaques (in 87%) and stents (in 34%). There were also incidental findings, not directly related to coronary artery disease, such as pulmonary nodules and aortic stenosis.

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