常规辐射剂量评估参数与体型特异性剂量评估在估算儿童心脏CT扫描辐射剂量的差异

发布时间：2018-05-27 03:39

  本文选题：辐射剂量 + 容积　； 参考：《临床放射学杂志》2017年12期

【摘要】：目的比较常规辐射剂量评估参数与体型特异性剂量评估(SSDE)在估算先天性心脏病(CHD)患儿CT扫描时所受辐射剂量的差异。方法将161例CHD患儿按年龄分为A组(4个月)、B组(4个月~1岁)、C组(1~6岁)、D组(6岁),采用Philips 128螺旋CT扫描仪对CHD患儿进行心脏CT增强扫描,在气管隆突层面测量每例患儿的左右径(LAT)、前后径(AP),测算患儿有效直径(ED),同时记录每例患儿的容积CT剂量指数(CTDIvol)值、剂量长度乘积(DLP)值、有效辐射剂量(ED*)值,计算SSDE。分析CTDIvol、DLP、ED*及SSDE之间的差异性。结果 A组CTDIvol和SSDE分别为(2.705±0.110)m Gy和(6.688±0.352)m Gy(t=-65.780,P0.001),B组CTDIvol和SSDE分别为(2.699±0.166)m Gy和(6.394±0.429)m Gy(t=-66.191,P0.001),C组CTDIvol和SSDE分别为(2.516±0.232)m Gy和(5.727±0.640)m Gy(t=-32.653,P0.001),D组CTDIvol和SSDE分别为(2.580±0.147)m Gy和(5.098±0.289)m Gy(t=-15.540,P0.001),SSDE值均大于CTDIvol值,且随着年龄增长差值越大,SSDE之间差值较CTDIvol之间差值更大。另采用Pearson相关分析对体重及CTDIvol、DLP、ED*、SSDE进行相关性分析,结果显示体重与CTDIvol之间无相关性(r=-0.138,P0.05),而与DLP、ED*、SSDE存在相关性(r分别为0.232、0.232、-0.422,P0.01)。结论 CTDIvol明显低估了患儿所受的辐射剂量,SSDE能够更准确地反映不同体型患儿进行心脏CT扫描时实际接受的辐射剂量。
[Abstract]:Objective to compare the difference of radiation dose between conventional radiation dose evaluation parameters and somatotype specific dose evaluation (SSDE) in estimating CT scan dose in children with congenital heart disease (CHD). Methods 161 children with CHD were divided into group A (4 months old) and group B (4 months old) and group D (6 years old) were divided into group A (4 months old) and group D (6 years old). Philips 128 spiral CT scanner was used to scan the heart of children with CHD. The right and left diameters of each child were measured at the trachea protuberance level, the anterior and posterior diameters were measured, and the effective diameter EDV was calculated. The volume CT dose index (CTDIvoll), the dose length product (DLPV) and the effective radiation dose (EDN) were recorded at the same time, and the SSDE was calculated. To analyze the difference between DLP ED* and SSDE. 缁撴灉 A缁凜TDIvol鍜孲SDE鍒嗗埆涓，

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