自动触发技术在头颈部双能量成像的应用

目的:探讨双源CT自动触发技术在头颈部CTA双能量成像的应用价值。方法:35例患者随机分成3组(自动触发阈值分别为20、50、70HU),自肘静脉注射造影剂,测量各组大脑中动脉近端,上矢状窦,C4水平左侧颈总动脉和静内静脉CT值,并进行对比分析。结果:各组颈总动脉和大脑中动脉强化无差异性。阈值20HU组和50HU组颈内静脉和上矢状窦强化有差异性;阈值50HU组和70HU组上矢状窦强化有差异性,余部位强化无差异性。结论:双源CT头颈部CTA双能量成像时,20HU触发阈值可得到较好的图像质量。

Clinical Application of Auto Trigger Technique with Dual-source CT in CT-Angiography of Cerebral and Carotid Arteries

Objective To evaluate the clinical application of the auto trigger technique with dual-source CT in cerebral and cervical vessel. Methods 35 patients were randomly divided into three groups, taking triggered threshold as 20HU,50HU and 70HU respectively, CT-values in segments of left middle cerebral artery, superior sagittal sinus, left common carotid artery adjacent to the fourth cervical vertebrate and internal jugular vein by injection at antecubital vein were all measured. Results The discrepancy of peak in artery among groups was not statistically different. It was statistically different in the same segments of vein. Conclusion CTA of cerebral and carotid arteries with the dual-source CT triggered technique can be clearly showed with 20HU as triggered threshold.