Department of Radiology, Yamaguchi University Graduate School of Medicine, 1-1-1 Minamikogushi, Ube, 755-8505, Japan.
Jpn J Radiol. 2011 Jun;29(5):316-23. doi: 10.1007/s11604-011-0560-3. Epub 2011 Jun 30.
The purpose of this study was to evaluate the image quality (IQ) of dual-source CT (DSCT) versus single-source CT (SSCT).
A total of 100 patients underwent 64-section CT coronary angiography (50 DSCT, 50 SSCT). Three observers evaluated the IQ of each coronary segment using a four-point scale (1, excellent; 2, good; 3, fair; 4, no assessment). The IQ of DSCT coronary angiography was compared with SSCT coronary angiography on a per-patient, per-vessel, and per-segment basis using the chi-squared test.
The DSCT image quality score (IQS) was significantly lower on a per-patient basis and per-vessel basis for all vessels and on a per-segment basis for some segments (1, 2, 4PD, 4AV, 7, 9, 11, 12, 13) compared with SSCT. The DSCT IQS was significantly lower for certain segments (2, 4PD, 11, 13) with high heart rates (≥70 beats/min). The DSCT IQS was significantly lower for certain segments (1, 2, 3, 4PD, 4AV, 7, 8, 9, 10, 12, 13) with low heart rates (<70 beats/min).
DSCT showed a significantly better IQ than SSCT, especially in patients with low heart rates.
本研究旨在评估双源 CT（DSCT）与单源 CT（SSCT）的图像质量（IQ）。
共 100 例患者行 64 层 CT 冠状动脉成像（50 例 DSCT，50 例 SSCT）。3 位观察者采用 4 分制评估每段冠状动脉的 IQ（1 分，极好；2 分，好；3 分，中等；4 分，无法评估）。采用卡方检验比较 DSCT 和 SSCT 冠状动脉成像的患者、血管和节段 IQ。
DSCT 图像质量评分（IQS）在患者、血管和节段基础上均显著低于 SSCT（1 分、2 分、4PD、4AV、7、9、11、12、13）。对于某些心率较高（≥70 次/分）的节段（2、4PD、11、13），DSCT 的 IQS 也显著降低。对于某些心率较低（<70 次/分）的节段（1、2、3、4PD、4AV、7、8、9、10、12、13），DSCT 的 IQS 也显著降低。
DSCT 的 IQ 明显优于 SSCT，尤其是在心率较低的患者中。
