| 摘要: |
| 【】目的 比较320排CT 容积扫描法(volume法)与螺旋扫描法(helical法)在低心率患者冠状动脉成像中的应用优势。方法128 例患者分成两组行前瞻性冠状动脉扫描,组1：volume法(n=72)；组2：helical法(n=56)。冠状动脉分为9段,采用4分法评估图像质量。对两组的图像质量和辐射剂量进行统计学分析。结果 组1与组2升主动脉根部CT值分别为(492.08±58.51) HU、(522.72±56.91)HU,噪声分别为(19.64±3.51) HU、(22.66±5.33)HU,差异均无统计学意义(p均>0.05)；冠状动脉图像质量评分：组1与组2均满足诊断需要。冠状动脉节段的优秀率分别达到 97.5%(632/648)、96.8%(488/504)；合格率分别达到99.7%(646/648)、99.2%(500/504)；两组间图像质量差异无统计学意义(p>0.05)。组1与组2 有效辐射剂量分别为 (3.21±0.23) mSv、(13.27±2.39) mSv,两组的差异有统计学意义(p<0.05)。组1对比剂用量为50～60ml,组2对比剂用量为80～90ml。结论 心率患者320排CT前瞻性心电门控扫描volume法与helical法均可获得满足临床诊断需要的冠状动脉图像质量,其中volume法辐射剂量更低,所用造影剂剂量更少,具有良好的应用前景。 |
| 关键词: 320排容积CT 冠状动脉成像 低心率 辐射剂量 |
| DOI：10.3724/SP.J.1008.2014.00796 |
| 投稿时间：2014-03-11修订日期：2014-05-13 |
| 基金项目: |
|
| Comparison of volume scan and helical scan in low heart rate coronary CT angiography at 320-row CT |
| XU Bing,LU He-qing,TIAN Bing,CHEN Chao,WANG Min-jie |
| (Changhai Hospital, Second Military Medical University;Radioactive medicine Research Institute of Fudan University/Shanghai First Maternal and infant Health-Care Hospital) |
| Abstract: |
| Objective To investigate the image quality and radiation dose of low heart rate for coronary CT angiography obtained with a prospectively-gated technique volume scan versus a prospectively-gated technique helical scan. Methods Coronary CT angiography obtained with 320-row CT were evaluated in 128 patients. These patients were assigned into two groups: Group 1(n=72), patients undergoing prospectively gated technique volume scan; Group 2(n=56), patients undergoing helical scan. The main branches of coronary arteries were divided into 9 segments. Meanwhile, the image quality was evaluated with a four-point grading scale. The student t test was performed to evaluate the difference between the two groups, which include image noise, excellent rate and pass rate of image, and effective radiation dose. Results The ascending aorta root CT value of group 1 and group 2 were respectively (492.08 ± 58.51) HU and (522.72 ±56.91) HU, and the image noise of the two groups were respectively (19.64 ± 3.51)HU and (22.66 ± 5.33)HU. Coronary artery image quality of group 1 and group 2 both satisfy the diagnosis. Excellent rate were respectively 97.5% (632/648), and 96.8% (488/504), and pass rate were respectively 99.7% (646/648), and 99.2% (500/504), There was no significant difference (p > 0.05)in image noise, excellent rate of image, and pass rate of image between group1 and group2. Effective radiation dose of group 1 and group 2 were respectively (3.21 ± 0.23) mSv, and (13.27 ± 2.39) mSv, The difference in effective radiation dose between the two groups was significant (p = 0.000).Conclusion Image quality of coronary CT angiography obtained with a prospectively-gated technique volume scan and a prospectively-gated technique helical scan can meet clinical diagnosis. As compared with helical scan, radiation dose was much lower when the patient underwent the volume scan. Conclusively, it is a kind of good method of assessment of coronary artery. |
| Key words: 320-low volume CT Coronary angiography Low heart rate Radiation dose |
