Abstract：Objective: To study the effect of angiography of the pulmonary arteries using the intelligent technology in the same trigger position, but different threshold value of low dose contrast agent, in order to improve the pulmonary CTA image quality. Methods: Seventy-two patients accepting pulmonary artery CTA were randomly divided into A, B, C group. The superior vena cava in the level of the aortic arch was the monitor position. 50, 80, 110 HU were the monitoring threshold under which the intelligent trigger scan was administered respectively. Both the difference of CT value of main pulmonary artery, segmental pulmonary artery, vein, aorta, and the difference between the subsegmental pulmonary arterial and the pulmonary venous enhancement CT value, and the differences of image quality in different monitoring threshold levels were compared finally. Results: The differences of the enhancement CT value of the main pulmonary artery, segmental pulmonary artery and pulmonary vein, aorta and subsegmental pulmonary artery and pulmonary vein and the image quality in different monitoring threshold level were significant. The 50 HU group had good image quality and superior to the other two groups(P<0.05). There were no significant difference between the 80 HU and the 110 HU groups(P>0.05) in the segmental pulmonary artery and vein. Conclusion: With superior vena cava for monitoring points in the level of the aortic arch, and by using 50 HU as the trigger threshold can obtain more ideal images.
张军晖，何建平，曹文广，呼延佩，张世衡，苏宝珠，韩迎春，张 宇，李 斌，刘吉明. 宝石CT小剂量对比剂肺动脉成像不同阈值的应用研究[J]. 中国临床医学影像杂志, 2015, 26(11): 776-778.
ZHANG Jun-hui, HE Jian-ping, CAO Wen-guang, HU Yan-pei, ZHANG Shi-heng,. Study on the angiography of the pulmonary arteries in different threshold using low dose contrast with gemstone CT. JOURNAL OF CHINA MEDICAL IMAGING, 2015, 26(11): 776-778.
