Department of Diagnostic and Interventional Radiology, University Hospital of Ulm, Steinhövelstr. 9, 89075, Ulm, Germany.
Eur Radiol. 2010 May;20(5):1124-31. doi: 10.1007/s00330-009-1652-7. Epub 2009 Nov 14.
To compare image quality and effective radiation dose for prospectively gated axial CT coronary angiography on 64- and 256-slice CT.
The patient cohort consisted of 80 consecutive patients undergoing imaging with 256-slice CT and 80 patients with 64-slice CT. The two patient groups were demographically matched according to age, gender, body mass index and heart rate. For both groups, two observers independently assessed image quality for all coronary segments on a five-point ordinal scale. The two groups were compared with regard to image quality and effective radiation dose. Image quality scores less than 3 were considered non-diagnostic.
Mean effective radiation dose did not significantly differ between the two groups (3.4 +/- 0.8 mSv in both groups; p > 0.1). Vessel-based image quality was significantly better in patients undergoing 256-slice CT compared with those undergoing 64-slice CT (p < 0.001). The proportion of assessable coronary segments significantly increased from 95.6% in the 64-slice group to 98.9% in the 256-slice group (p < 0.05).
Prospectively gated axial CT coronary angiography performed on 256-slice CT provides significantly improved and more stable image quality at an equivalent effective radiation dose compared with 64-slice CT.
比较 64 层和 256 层螺旋 CT 前瞻性心电门控轴向 CT 冠状动脉成像的图像质量和有效辐射剂量。
患者队列包括 80 例连续接受 256 层 CT 成像和 80 例 64 层 CT 成像的患者。两组患者根据年龄、性别、体重指数和心率进行人口统计学匹配。对于两组，两名观察者均使用 5 分等级量表独立评估所有冠状动脉节段的图像质量。比较两组的图像质量和有效辐射剂量。图像质量评分小于 3 分被认为是不可诊断的。
两组之间的平均有效辐射剂量无显著差异（两组均为 3.4 +/- 0.8 mSv；p > 0.1）。与 64 层 CT 组相比，256 层 CT 组的血管基图像质量显著改善（p < 0.001）。可评估的冠状动脉节段比例从 64 层组的 95.6%显著增加到 256 层组的 98.9%（p < 0.05）。
与 64 层 CT 相比，256 层螺旋 CT 前瞻性心电门控轴向 CT 冠状动脉成像可在等效有效辐射剂量下提供显著改善和更稳定的图像质量。
