Initial evaluation of coronary images from 320-detector row computed tomography View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

2008-06

AUTHORS

Frank J. Rybicki, Hansel J. Otero, Michael L. Steigner, Gabriel Vorobiof, Leelakrishna Nallamshetty, Dimitrios Mitsouras, Hale Ersoy, Richard T. Mather, Philip F. Judy, Tianxi Cai, Karl Coyner, Kurt Schultz, Amanda G. Whitmore, Marcelo F. Di Carli

ABSTRACT

PURPOSE: To evaluate image quality and contrast opacification from coronary images acquired from 320-detector row computed tomography (CT). Patient dose is estimated for prospective and retrospective ECG-gating; initial correlation between 320-slice CT and coronary catheterization is illustrated. METHODS: Retrospective image evaluation from forty consecutive patients included subjective assessment of image quality and contrast opacification (80 ml iopamidol 370 mg I/ml followed by 40 ml saline). Region of interest opacification measurements at the ostium and at 2.5 mm diameter were used to determine the gradient of contrast opacification (defined as the proximal minus distal HU measurements) in coronary arteries imaged in a single heartbeat. Estimated effective dose was compared for prospective versus retrospective ECG-gating, two body mass index categories (30 kg/m(2) cutoff), and single versus two heartbeat acquisition. When available, CT findings were correlated with those from coronary catheterization. RESULTS: Over 89% of arterial segments (15 segment model) had excellent image quality. The most common reason for image degradation was cardiac motion. One segment in one patient was considered unevaluable. Contrast opacification was almost universally considered excellent. The mean Hounsfield units (HU) was greater than 350; the coronary contrast opacification gradient was 30-50 HU. Patient doses were greater for retrospective ECG-gating, larger patients, and those imaged with two heartbeats. For the most common (n=25) protocol (120 kV, 400 mA, prospective ECG-gating, 60-100% phase window, 16 cm craniocaudal coverage, single heartbeat), the mean dose was 6.8+/-1.4 mSv. All CT findings were confirmed in the four patients who underwent coronary catheterization. CONCLUSION: Initial 320-detector row coronary CT images have consistently excellent quality and iodinated contrast opacification. These patients were scanned with conservative protocols with respect to iodine load, prospective ECG-gating phase window, and craniocaudal coverage. Future work will focus on lowering contrast and radiation dose while maintaining image quality. More... »

PAGES

535-546

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  • Identifiers

    URI

    http://scigraph.springernature.com/pub.10.1007/s10554-008-9308-2

    DOI

    http://dx.doi.org/10.1007/s10554-008-9308-2

    DIMENSIONS

    https://app.dimensions.ai/details/publication/pub.1026084106

    PUBMED

    https://www.ncbi.nlm.nih.gov/pubmed/18368512


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