低电压自动管电流调节技术在上腹部增强CT扫描中的应用

发布时间：2018-04-29 05:37

本文选题：腹部 + 辐射剂量　；参考：《中国医学影像技术》2015年06期

【摘要】：目的探讨低电压自动管电流调节(ATCM)技术在上腹部增强CT扫描中的价值。方法将腹围90cm的100例患者随机分为2组,观察组(n=50):管电压100kV,ATCM,动、静脉期参考管电流250、230mAs。对照组:管电压120kV,ATCM,动、静脉期参考管电流为210、190mAs。测量并对比两组图像噪声、肝脏和胰腺SNR、肝脏-竖脊肌和胰腺-竖脊肌CNR、腹主动脉CT值、腹主动脉SNR、腹主动脉-竖脊肌CNR、静脉期容积CT剂量指数(CTDlvol)、剂量长度乘积(DLP)及有效剂量(ED)。结果两组图像噪声、肝脏SNR、胰腺SNR、腹主动脉CT值、CTDIvol、DLP、ED比较,差异均有统计学意义(P均0.05);腹主动脉SNR、腹主动脉-竖脊肌CNR、肝脏-竖脊肌CNR、胰腺-竖脊肌CNR、腹腔干三维分支评分及血管清晰度评分、轴位图像主观评价比较,差异均无统计学意义(P均0.05)。结论低管电压、ATCM上腹部增强CT扫描可降低辐射剂量,提高动脉血管显影程度,可满足诊断要求。
[Abstract]:Objective to evaluate the value of low voltage automatic tube current regulation (ATCM) technique in enhanced CT scan of upper abdomen. Methods one hundred patients with abdominal circumference 90cm were randomly divided into two groups: the observation group (n = 50): the voltage of tube was 100kV, the current of reference tube was 250230mAs. In the control group, the voltage of the tube was 120 kV and the current of the reference tube was 210190 mAs. The image noise, SNR of liver and pancreas, CNRand CT value of abdominal aorta, SNR of abdominal aorta, CNR of abdominal aorta, CTDlvoll index of volume CT in venous phase, DLPs of dose length and effective dose EDD were measured and compared between the two groups. Results the image noise, liver SNR, pancreatic SNR, abdominal aorta CT value were compared between the two groups. The differences were statistically significant (P < 0.05), abdominal aorta SNR, abdominal aorta-erector muscle CNR, hepato-vertical spinal muscle CNR, pancreas and vertical spinal muscle CNR, abdominal trunk three-dimensional branch score and vascular articulation score, subjective evaluation of axial images were compared. The difference was not statistically significant (P = 0.05). Conclusion ATCM enhanced CT scan with low tube voltage can reduce the radiation dose, increase the degree of arterial angiography, and meet the diagnostic requirements.
【作者单位】：福建中医药大学附属厦门中医院影像科;
【基金】：福建中医药大学校管课题(xb2014052)
【分类号】：R816.5

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