摘要
目的观察多层螺旋CT肺动脉造影(MSCTPA)在不同扫描参数及呼吸模式下的肺动脉强化程度,探讨获得最佳图像质量的合理化技术。方法前瞻性选择90例接受MSCTPA检查的PE患者,将其随机均分成Ⅰ、Ⅱ、Ⅲ组,分别设定50、80、120HU作为监测阈值进行追踪触发扫描;将每组再随机均分为A、B两亚组,分别于平静呼吸状态下进行扫描或吸气后屏气进行扫描,比较肺动脉、肺静脉、主动脉强化CT值及不同组别MSCTPA的重建图像质量。结果Ⅰ、Ⅱ、Ⅲ组肺动脉CT值分别为(488.12±17.21)HU、(344.53±10.43)HU、(181.95±24.13)HU(P<0.05);肺静脉CT值分别为(92.26±16.76)HU、(210.57±18.28)HU、(320.82±26.25)HU(P<0.05);主动脉CT值分别为(128.48±20.36)HU、(280.35±25.56)HU、(402.75±32.64)HU(P<0.05)。ⅠA、ⅠB亚组肺动脉干CT值分别为(502.28±9.34)HU、(474.94±11.78)HU(P=0.446);ⅡA、ⅡB组肺动脉干CT值分别为(352.47±8.16)HU、(336.38±6.46)HU(P=0.034);ⅢA、ⅢB组肺动脉干CT值分别为(197.32±7.34)HU、(165.78±24.67)HU(P=0.005)。Ⅰ、Ⅱ、Ⅲ各组图像质量评分均值分别为3.97、3.43、2.60分。结论 MSCTPA中,设定50HU为监测阈值,于平静呼吸下行追踪触发扫描,可获得最佳图像质量。
Objective To compare the enhancement degree of pulmonary artery of multi-slice spiral CT pulmonary angiography（MSCTPA） with different scanning parameters and breathing patterns,in order to obtain the best image quality.Methods Ninety patients of PE who underwent MSCTPA were prospectively selected and randomly divided into group Ⅰ,Ⅱ and Ⅲ,in which 50,80 and 120 HU were taken as the monitoring threshold tracking triggers,respectively.Patients in each group were divided in to two subgroups and receiving calm breathing scanning（subgroup A） or air suction after breath-hold scanning（subgroup B）.Enhancement of pulmonary artery,pulmonary vein and aorta,as well as reconstructed image quality of MSCTPA were compared.Results CT value of the pulmonary artery in group Ⅰ,Ⅱ and Ⅲ was（488.12±17.21）HU,（344.53±10.43）HU and（181.95±24.13）HU,respectively（P〈0.05）,of the pulmonary vein was（92.26±16.76）HU,（210.57±18.28）HU and（320.82±26.25）HU,respectively（P〈0.05）,while of aorta was（128.48±20.36）HU,（280.35±25.56）HU and（402.75±32.64）HU,respectively（P〈0.05）.CT value was（502.28±9.34）HU and（474.94±11.78）HU in ⅠA and ⅠB subgroup（P=0.446）,（352.47±8.16）HU and（336.38±6.46）HU in ⅡA and ⅡB subgroup（P=0.034）,（197.32±7.34）HU and（165.78±24.67）HU in ⅢA and ⅢB subgroup（P=0.005）.The average score of image quality was 3.97,3.43 and 2.60 in groupⅠ,Ⅱ and Ⅲ,respectively.Conclusion Taking 50 HU as the monitor threshold,quiet breathing and down-track triggering scanning enables the best MSCTPA image quality. 更多还原
出处
《中国医学影像技术》
CSCD
北大核心
2012年第10期1914-1917,共4页
Chinese Journal of Medical Imaging Technology
关键词
肺栓塞
体层摄影术
X线计算机
监测阈值
呼吸模式
Pulmonary embolism
Tomography, X-ray computed
Monitor threshold
Respiratory pattern
