Department of Diagnostic and Interventional Radiology, Johann Wolfgang Goethe-University, Theodor Stern Kai 7, 60590, Frankfurt, Germany.
Eur Radiol. 2011 Mar;21(3):530-7. doi: 10.1007/s00330-010-1954-9. Epub 2010 Sep 23.
To compare the dose estimates and image quality of Dual Energy CT (DECT), Dual Source CT (DSCT) and 16-slice CT for coronary CT angiography (cCTA).
Sixty-eight patients were examined with 16 - slice MDCT (group 1), 68 patients with DSCT (group 2) and 68 patients using DSCT in dual energy mode (DECT group 3). CT dose index volume, dose length product, effective dose, signal-to-noise, and contrast-to-noise ratio were compared. Subjective image quality was rated by two observers, blinded to technique.
The mean estimated radiation dose of all patients investigated on a 16 - slice MDCT was 12 ± 3.59 mSv, for DSCT in single energy 9.8 ± 4.77 mSv and for DECT 4.54 ± 1.87 mSv. Dose for CTA was significantly lower in group 3 compared to group 1 and 2. The image noise was significantly lower in Group 2 in comparison to group 1 and group 3. There was no significant difference in diagnostic image quality comparing DECT and DSCT.
cCTA shows better dose levels at both DECT and DSCT compared to 16-slice CT. Further, DECT delivers significantly less dose than regular DSCT or single source single energy cCTA while maintaining diagnostic image quality.
比较双能 CT（DECT）、双源 CT（DSCT）和 16 层 CT 用于冠状动脉 CT 血管造影（cCTA）的剂量估算和图像质量。
68 例患者接受 16 层 MDCT（组 1）、68 例患者接受 DSCT（组 2）和 68 例患者采用 DSCT 双能量模式（DECT 组 3）检查。比较 CT 剂量指数容积、剂量长度乘积、有效剂量、信噪比和对比噪声比。两名观察者对图像质量进行主观评价，观察者对技术不了解。
16 层 MDCT 上所有患者的平均估计辐射剂量为 12±3.59 mSv，单能量 DSCT 为 9.8±4.77 mSv，DECT 为 4.54±1.87 mSv。与组 1 和组 2 相比，组 3 的 CTA 剂量明显较低。与组 1 和组 3 相比，组 2 的图像噪声明显较低。DECT 和 DSCT 的诊断图像质量无显著差异。
与 16 层 CT 相比，cCTA 在 DECT 和 DSCT 上的剂量水平都更好。此外，DECT 在保持诊断图像质量的同时，比常规 DSCT 或单源单能 cCTA 辐射剂量显著降低。
