Abstract:Objective To compare the radiation dose of coronary CT angiography (CCTA) with free-breathing and breath-holding.
Methods A total of 102 patients underwent coronary CTA. Heart rate (HR) test was performed under free-breathing and breathholding.
Radiation dose was estimated and compared. The scan was performed either during breath-holding or free-breathing with
the lower estimate radiation dose length product (DLP). Results For the patients with high HR (>75 bpm, n=16), 4 patients (25%)
had their DLP increased to 156.26±1.97% after breath holding. For the patients with intermediate HR (65~75 bpm, n=35), more
than half (n=19) received reductions on explosure interval and radiation dose (DLP reduced to 42.48%±2.46% and 54.35%±1.66%
of that with free-breathing). For the moderate-HR patients, more than half (n=19, 54.3%) had their DLP reduced to 74.02%±6.82%
while a minority (n=4, 11.4%) had their DLP greatly increased to 177.31%±16.06%. The low-HR patiends neither had their
explosure phase nor DLP changed after breath-holding. Conclusion Breath-holding or free-breathing CCTA should be preformed
selectively to optimize the scan phase and reduce the radiation dose.
原媛,钟朝辉,王振常,张婷婷,张景东. 冠脉CTA自由呼吸扫描与屏息扫描的辐射剂量对比研究[J]. 中国医疗设备, 2018, 33(10): 74-78.
YUAN Yuan, ZHONG Zhaohui, WANG Zhenchang, ZHANG Tingting, ZHANG Jingdong. Comparative Study on the Radiation Dose of Coronary CT Angiography
with Free-Breathing and Breath-Holding. China Medical Devices, 2018, 33(10): 74-78.