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The purpose of this study is to compare the radiation exposure of a variety of chest CT examinations performed on the current state of the art CT scanners (64 slice, dual source CT scanner) with the radiation exposure for identical chest CT examinations performed on the Siemens Flash CT scanner (high pitch dual source spiral technique).
Computed tomography has emerged as the "gold standard" for the diagnosis of a broad range of medical diagnoses. For cardiac imaging alone, the installation of CT scanners in US cardiology practices alone has tripled over the past 2 years. Patients who undergo cardiac CTA (computed tomography angiography) may be subjected to relatively high doses of ionizing radiation (ie. 4 times annual background radiation) during the diagnosis and management of coronary artery disease. Current radiation doses for cardiac CT examinations are comparable to the effective doses for patients undergoing nuclear stress tests or cardiac catheterization (ie. approx 10-15 milliSieverts). In addition, non cardiac CT protocols, such as chest CT examinations for the evaluation of pulmonary arteries, thoracic and abdominal aorta, and lung nodules, are associated with significant radiation exposure. Many patients undergo repeated CT examinations over several years for such pathology. There is a growing public concern regarding the cancer risk associated with such radiation.
Recent major technological advances have been made with the advent of newer generation CT scanners which allow significant radiation dose reduction. One such scanner, the dual source CT, is a new high pitch dual source spiral technique that offers the ability to image a patient's chest with ECG gated imaging protocols within a single second. These technological advances allow significant radiation dose savings, often resulting in effective radiation doses of less than one millisievert (mSv).
Observational Model: Case-Only
William Beaumont Hospital-Royal Oak
Not yet recruiting
William Beaumont Hospitals
Published on BioPortfolio: 2014-07-23T21:09:25-0400
Patients planned for elective conventional coronary angiography will undergo CT coronary angiography (Dual Source CT) in order to assess the correlation of stenosis detection and therapeut...
The purpose of this study is to test the ability of a new X-ray technique called CT angiography to identify significant narrowing of the coronary arteries compared to traditional coronary ...
The purpose of this study is to evaluate the radiation exposure in patients undergoing coronary angiography, and to identify reference values for the main radiation doses parameters.
The purpose of this study is to evaluate whether 64-slice CT coronary angiography is useful for rapid diagnosis or exclusion of significant coronary artery disease in patients who present ...
To detect and evaluate the predictors of graft patency after coronary artery bypass graft surgery as assessed by multi-slice CT coronary angiography validated by coronary angiography
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Radiography of the vascular system of the heart muscle after injection of a contrast medium.
Abnormal balloon- or sac-like dilatation in the wall of CORONARY VESSELS. Most coronary aneurysms are due to CORONARY ATHEROSCLEROSIS, and the rest are due to inflammatory diseases, such as KAWASAKI DISEASE.
Malformations of CORONARY VESSELS, either arteries or veins. Included are anomalous origins of coronary arteries; ARTERIOVENOUS FISTULA; CORONARY ANEURYSM; MYOCARDIAL BRIDGING; and others.
Complete blockage of blood flow through one of the CORONARY ARTERIES, usually from CORONARY ATHEROSCLEROSIS.
Non-invasive method of vascular imaging and determination of internal anatomy without injection of contrast media or radiation exposure. The technique is used especially in CEREBRAL ANGIOGRAPHY as well as for studies of other vascular structures.
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