[Initial application of coronary images from 320-slice dynamic volume MDCT].

OBJECTIVE:To evaluate initial application of coronary images from 320-slice dynamic volume MDCT (Toshiba Aquilion One dynamic volume MDCT). METHODS:180 consecutive patients with suspected coronary artery disease were studied by ECG-gated 320-slice dynamic volume MDCT with non-helical scanning mode in our hospital from November, 2008 to January, 2009. 14 patients also underwent conventional coronary angiography. Images were retrospectively reconstructed under volume rendering technology, maximum intensity projection, multiplanar reconstruction and curved planar reformation. Image quality was analyzed in axial 320-detector row images through the mid-RCA. Sensitivity, specificity, positive and negative predictive value of > or = 50% stenosis were calculated. RESULTS:145 (80.56%) cases had excellent images at average heart rate of 63 bpm.25 (13.89%) cases had good images at average heart rate of 78 bpm.8 (4.44%) cases had acceptable images at average heart rate of 85 bpm.2 (1.11%) cases had unevaluable images at average heart rate of 96 bpm. No stair-step artifact was found. 40 segments with > or = 50% stenosis were shown in CTA, while 37 segment in CAG. The sensitivity, specificity, positive and negative predictive value of the 320 slice DMCT in detecting coronary artery stenosis > or = 50% were 94.59%, 94.80%, 87.50% and 98.82% respectively. CONCLUSION:Coronary images from 320-slice dynamic volume MDCT with wide area detector and non-helical scanning mode have excellent quality and less artifacts.320-slice coronary CT angiography provides high sensitivity and specificity in detecting coronary artery stenosis.