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This study was retrospectively to compare the exposure dose and the imaging quality in coronary CT angiography by using the 64 channel multidetector computed tomography and the 128 channel DSCT. Effective dose was calculated dose length product (DLP) by multiplied the convention factor of chest (0.017). Imaging quality was assessed by radiologists using the 5-point Likert scale. The DLP was ranged from 851 to (mean: 17.23 mSv) in the 64 channel MDCT and from 82 to (mean: 1.58 mSv) in the of 128 channel DSCT, respectively. The score of imaging quality was respectively in 64 channel MDCT and in the 128 channel DSCT. The exposure dose of 128 channel DSCT has decreased 1ess 1/10. The score of imaging quality was significant difference between two modalities and the frequency (>4 good) in the 128 channel DSCT is about three times than that of the 64 channel MDCT. Therefore, the 128 channel DSCT in coronary CT angiography is clinically more effective modality for both investigators and patients.

The clinical usefulness of 64 channel MDCT and 128 channel DSCT in coronary CT angiography