American Journal of Roentgenology, Vol 170, 895-899, Copyright © 1998 by American Roentgen Ray Society

ARTICLES

Curved multiplanar reconstructions for the evaluation of contrast- enhanced electron beam CT of the coronary arteries

S Achenbach, W Moshage, D Ropers and K Bachmann
Department of Internal Medicine II (Medizinische Klinik II), University of Erlangen-Nurnberg, Germany.

OBJECTIVE: We investigated the applicability of curved multiplanar reconstructions for the evaluation of contrast-enhanced electron beam CT scans of the coronary arteries. SUBJECTS AND METHODS: Thirty-two patients (43-72 years old; mean age, 58 years old) underwent electron beam CT. After injection of i.v. contrast medium, 40 axial cross sections of the heart were acquired, triggered to the ECG during breath- hold (3-mm slice thickness, 1-mm overlap). Curved multiplanar reconstructions were obtained separately for each coronary artery. The reconstructions were independently evaluated by two investigators for the presence of high-grade stenoses and occlusions. The results were then compared with coronary angiography results, of which the two investigators had been unaware. RESULTS: Because of degraded image quality, 15 (12%) of the 128 vessels (left main, left anterior descending, left circumflex, and right coronary arteries in 32 patients) were excluded from evaluation. In the remaining 113 vessels, 16 (89%) of 18 high-grade stenoses and occlusions were correctly detected (89% sensitivity). Absence of significant stenosis was correctly detected in 87 (92%) of 95 vessels (92% specificity). The negative and positive predictive values were 98% and 67%, respectively. CONCLUSION: Curved multiplanar reconstructions are useful in the evaluation of contrast-enhanced electron beam CT scans of coronary arteries.
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