Chen Yuhuan, Wei Donghong, Li Dou, Liu Zhentang, Hu Zhijun, Li Michelle, Jia Yongjun, Yu Yong, Han Dong, Ren Ranzhi, Yu Nan, He Taiping
Department of Radiology, Chang'an Hospital, Shaanxi, Xi'an, China.
Brookfield East High School, Brookfield WI.
J Comput Assist Tomogr. 2018 Nov/Dec;42(6):906-911. doi: 10.1097/RCT.0000000000000787.
The aim of this study was to investigate radiation dose and image quality of coronary computed tomography (CT) angiography (CCTA) for patients with high heart rate variability (HRv) using 16-cm wide-detector CT scanner.
One hundred sixty-six patients with uncontrolled heart rate underwent CCTA on a 16-cm wide-detector CT system and were divided into 2 groups based on their HRv for analysis: group A (n = 95, HRv ≤10 beats/min [bpm]) and group B (n = 71, HRv >10 bpm). Images in both groups were reconstructed with motion correction algorithm. Subjective and objective image qualities were analyzed.
There were no significant differences in age, body mass index, and heart rate (68.1 ± 11.4 vs 67.6 ± 12.3 bpm) between the 2 groups (P > 0.05). However, group B had significantly higher HRv than group A (33.5 ± 24.4 vs 7.8 ± 1.2 bpm, P < 0.001). All images were acceptable for clinical diagnosis. Compared with group A, image quality scores in group B decreased slightly (4.1 ± 0.5 vs 4.0 ± 0.6). However, the difference was not statistically significant. The mean effective doses were both relatively low at 2.2 ± 1.1 mSv in group A and 2.6 ± 1.4 mSv in group B.
Single-heartbeat free-breathing CCTA can be performed for patients with high HRv using 16-cm wide-detector CT scanner to achieve diagnostic image quality with low radiation dose.
本研究旨在使用16厘米宽探测器CT扫描仪，调查心率变异性（HRv）高的患者的冠状动脉计算机断层扫描（CT）血管造影（CCTA）的辐射剂量和图像质量。
166例心率未得到控制的患者在16厘米宽探测器CT系统上接受了CCTA检查，并根据其HRv分为2组进行分析：A组（n = 95，HRv≤10次/分钟 [bpm]）和B组（n = 71，HRv>10 bpm）。两组图像均采用运动校正算法重建。分析主观和客观图像质量。
两组患者在年龄、体重指数和心率方面（68.1±11.4 vs 67.6±12.3 bpm）无显著差异（P>0.05）。然而，B组的HRv显著高于A组（33.5±24.4 vs 7.8±1.2 bpm，P<0.001）。所有图像均可用于临床诊断。与A组相比，B组的图像质量评分略有下降（4.1±0.5 vs 4.0±0.6）。然而，差异无统计学意义。A组的平均有效剂量相对较低，为2.2±1.1 mSv，B组为2.6±1.4 mSv。
使用16厘米宽探测器CT扫描仪，可为HRv高的患者进行单心跳自由呼吸CCTA，以实现低辐射剂量下的诊断图像质量。
