CAJ | 학술논문

目的：探讨不同智能触发阈值条件下的肺动脉CTA图像效果，以期获得肺动脉成像的最佳触发阈值。方法60例接受肺动脉CTA患者随机均分成A、B、C3组，分别以肺动脉基础CT值加5HU（A组）、45HU（B组）、85HU（C组）作为监测阈值进行追踪触发扫描，比较肺动脉、肺静脉、主动脉强化CT 值及肺动脉与主动脉强化CT 值差值的组间差异，同时比较不同监测阈值下等级图像差异。结果肺动脉、肺静脉、主动脉强化CT值及肺动脉与主动脉强化CT值差值在3组间有显著性差异，不同监测阈值下等级图像有显著性差异（ P ＜0．001）。A组与其它2组有显著性差异（ P ＜0．001）；B组与C组有显著性差异（ P ＜0．001）。结论以主肺动脉干为监测点，肺动脉基础CT值加5HU为肺动脉成像时的最佳触发阈值。
목적：탐토불동지능촉발역치조건하적폐동맥CTA도상효과，이기획득폐동맥성상적최가촉발역치。방법60례접수폐동맥CTA환자수궤균분성A、B、C3조，분별이폐동맥기출CT치가5HU（A조）、45HU（B조）、85HU（C조）작위감측역치진행추종촉발소묘，비교폐동맥、폐정맥、주동맥강화CT 치급폐동맥여주동맥강화CT 치차치적조간차이，동시비교불동감측역치하등급도상차이。결과폐동맥、폐정맥、주동맥강화CT치급폐동맥여주동맥강화CT치차치재3조간유현저성차이，불동감측역치하등급도상유현저성차이（ P ＜0．001）。A조여기타2조유현저성차이（ P ＜0．001）；B조여C조유현저성차이（ P ＜0．001）。결론이주폐동맥간위감측점，폐동맥기출CT치가5HU위폐동맥성상시적최가촉발역치。
Objective To compare the quality of the images using different thresholds of automatic bolus tracking in 64‐slice spiral CT angiography of pulmonary arteries ,hoping to get the best threshold .Methods Sixty patients were ran‐domly divided into three groups ,and the automatic bolus tracking thresholds of pulmonary CT value plus 5 HU (group A) ,45 HU(group B) ,85 HU(group C) in the pulmonary trunk were used respectively .The CT values of pulmonary ar‐tery ,pulmonary vein and aorta among four groups were compared ,at the same time ,the excellent rates of image under different thresholds were compared .Results The CT values of pulmonary artery ,pulmonary vein and aorta among three groups had statistical difference ,the excellent rate of image under different thresholds had significant difference ( P <0.001) ,there was significant difference between group A and the other two groups ( P <0 .001) ,there was also signifi‐cant difference between group B and group C ( P <0 .001) .Conclusion The bolus tracking thresholds of pulmonary CT value plus 5 HU in the pulmonary trunk is preferable .