Wang Tian, Li Boyu, Han Qiuli, Liao Li, Mo Renbin, Miao Yufeng, Xu Rulin, Zhang Wei
Department of Radiology, Liuzhou People's Hospital, Affiliated to Guangxi Medical University, Liuzhou, Guangxi, China.
Guangxi Key Clinical Specialties of Medical Imaging, Liuzhou, Guangxi, China.
Jpn J Radiol. 2025 May 14. doi: 10.1007/s11604-025-01796-4.
This study aims to evaluate the impact of different breath-holding techniques on the scanning length and radiation dose during coronary CT angiography (CCTA).
A total of 210 patients with suspected coronary artery disease, who were scheduled for CCTA, were prospectively enrolled and randomly assigned to one of three breath-holding groups: Group A (end-inspiratory breath-hold), Group B (breath-holding during calm respiration), and Group C (end-expiratory breath-hold), with 70 patients in each group. The parameters recorded and analyzed included resting heart rate (during calm respiration), scanning heart rate (during breath-holding), scan length, heart rate variability, radiation dose metrics, and patient comfort levels.
Four patients in the end-expiratory breath-hold group (Group C) were unable to maintain breath-hold during scanning, resulting in non-diagnostic images. The remaining 206 patients successfully completed the CCTA. Across all groups, the scanning heart rate was significantly lower than the resting heart rate (P < 0.05). Follow-up assessments revealed that breath-holding during calm respiration provided the highest comfort level. Both the volume scan length and radiation dose were significantly lower in Groups B and C compared to Group A (P < 0.05), with no significant differences observed between Groups B and C (P > 0.05). The image quality in Group C was significantly lower compared to Group A and Group B (P < 0.01).
Breath-holding during calm respiration in CCTA not only maintains the image quality, but also significantly lowers heart rate, scan length, and radiation dose, while simultaneously enhancing patient comfort and cooperation during the scan.
本研究旨在评估不同屏气技术对冠状动脉CT血管造影（CCTA）扫描长度和辐射剂量的影响。
前瞻性纳入210例计划行CCTA的疑似冠心病患者，并随机分为三个屏气组之一：A组（吸气末屏气）、B组（平静呼吸时屏气）和C组（呼气末屏气），每组70例。记录并分析的参数包括静息心率（平静呼吸时）、扫描心率（屏气时）、扫描长度、心率变异性、辐射剂量指标和患者舒适度。
呼气末屏气组（C组）有4例患者在扫描过程中无法保持屏气，导致图像无法诊断。其余206例患者成功完成CCTA。在所有组中，扫描心率均显著低于静息心率（P < 0.05）。随访评估显示，平静呼吸时屏气的舒适度最高。B组和C组的容积扫描长度和辐射剂量均显著低于A组（P < 0.05），B组和C组之间无显著差异（P > 0.05）。C组的图像质量显著低于A组和B组（P < 0.01）。
CCTA中平静呼吸时屏气不仅能保持图像质量，还能显著降低心率、扫描长度和辐射剂量，同时提高患者在扫描过程中的舒适度和配合度。
