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目的比较4处不同智能触发监测位置对多层螺旋CT(MSCT)颈动脉成像的影响,以期获得颈动脉多层螺旋CT血管成像(MSCTA)合理的智能触发监测点。方法通过排列区分组法随机将120例分入颈总动脉、主动脉弓升部、主动脉弓降部、肺动脉主干4个监测组内,根据120条颈动脉、颈静脉的3段感兴趣区(ROI)强化情况综合评价,由2位有经验的放射科医生盲法评价,对比4组不同智能触发监测点对成像的影响。结果30例颈总动脉智能触发组中,11例触发失败,19例成功;30例主动脉弓升部智能触发组中,触发失败7例,23例成功;30例主动脉弓降部智能触发和30例肺动脉主干智能触发组全部触发成功。颈总动脉、主动脉弓升部、主动脉弓降部和肺动脉主干各组触发成功时分叉水平颈动脉强化值分别为318.1、275.8、301.2、293.9HU,邻近颈静脉的强化值分别为88.7、147.4、257.5、91.7HU;触发失败时,颈总动脉、主动脉弓升部强化值分别为279.6、247.4HU;邻近颈静脉的强化值分别为285.4、74.1HU。结论4组比较,肺动脉主干智能触发不仅成功率高,且静脉回流程度最轻,是颈动脉MSCTA的理想触发点。
Objective To compare the effects of four different locations of intelligent triggering on MSCT imaging in order to obtain a reasonable intelligent triggering point of multislice spiral CT angiography (MSCTA). Methods 120 cases were randomly divided into four groups: common carotid artery, ascending aorta, aortic arch, and pulmonary artery trunk. The ROI of 120 carotid arteries and jugular veins were intensified Comprehensive evaluation of the situation, the blind evaluation by two experienced radiologists, compared with four different sets of intelligent trigger monitoring point on imaging. Results Among the 30 cases of common carotid artery triggering, 11 cases failed to trigger and 19 cases succeeded. In 30 cases of aortic arch ascending trigger, 7 cases failed to trigger and 23 cases succeeded. Thirty cases of aortic arch lower part were triggered intelligently and 30 cases of pulmonary artery The main smart trigger group all triggered successfully. Carotid artery, aortic arch ascending aorta and descending aorta and pulmonary artery trunk group were successfully mobilized when the bifurcation level of carotid artery enhancement values were 318.1,275.8,301.2,293.9 HU, adjacent to the jugular vein enhancement values were 88.7, 147.4, 257.5 , 91.7HU. When the trigger failed, the intensified values of the common carotid artery and the ascending aorta were 279.6 and 247.4HU, respectively. The enhancement values of adjacent jugular vein were 285.4 and 74.1HU respectively. Conclusion Compared with the 4 groups, the intelligent trigger of pulmonary artery trunk not only has a high success rate but also the lightest venous return, which is the ideal trigger point of carotid MSCTA.