螺旋CT低剂量扫描在育龄男女骨盆病变中的应用研究

Clinical application of low-dose spiral CT screening in pelvis diseases of male/femal at child-bearing age

目的:探讨育龄男女骨盆在做低剂量扫描时合理剂量选择及其应用价值。方法:选择96例患者,每个研究对象均用常规剂量(210mA)扫描,在征得患者同意后,用低剂量(50mA,25mA)再加扫一层或几层,两种扫描模式除了后者用低剂量技术,前者不用外,其余扫描参数相同,比较权重CT剂量学指数及CT图像质量的差别。结果:25mA时CTDIvol最小,为常规剂量扫描的11%,但图像质量与常规剂量相比差异有高度显著性(P<0.01);50mA时,CTDIvol为常规剂量扫描的22%,图像质量与常规剂量相比差异无显著性(P>0.05)。结论:育龄男女骨盆低剂量(50mA)扫描既可保证骨盆部病变的影像质量,又可降低患者的辐射剂量。

Objective：To explore the value of low-dose CT screening and the reasonable dose in the pelvis diseases of male/female at child-bearing age.Methods：96 patients were recruited in this study.Each patient was scanned in routine dose（210 mA） and,additionally,the low dose（50 mA,25 mA） scan was performed under the permission of the patients.Except the tube current（mA）,the other scan parameters were all the same.The differences of CTDI vol（CT dose index） and image quality in different dose were compared.Results：Compared to routine scanning,CTDI vol of 25 mA was 11%,but the differences of the image quality was statistically significant（P〈0.01）;While,CTDI vol of 50mA was 22%,but the difference of the image quality had no statistical significance（P〉0.05）.Conclusion：Low dose CT scanning（50 mA） can decrease the radiation dose and,also,assure the image quality.