本文選題：輻射劑量 + 容積�。� 參考：《臨床放射學(xué)雜志》2017年12期

【摘要】：目的比較常規(guī)輻射劑量評估參數(shù)與體型特異性劑量評估(SSDE)在估算先天性心臟病(CHD)患兒CT掃描時所受輻射劑量的差異。方法將161例CHD患兒按年齡分為A組(4個月)、B組(4個月~1歲)、C組(1~6歲)、D組(6歲),采用Philips 128螺旋CT掃描儀對CHD患兒進(jìn)行心臟CT增強(qiáng)掃描,在氣管隆突層面測量每例患兒的左右徑(LAT)、前后徑(AP),測算患兒有效直徑(ED),同時記錄每例患兒的容積CT劑量指數(shù)(CTDIvol)值、劑量長度乘積(DLP)值、有效輻射劑量(ED*)值,計算SSDE。分析CTDIvol、DLP、ED*及SSDE之間的差異性。結(jié)果 A組CTDIvol和SSDE分別為(2.705±0.110)m Gy和(6.688±0.352)m Gy(t=-65.780,P0.001),B組CTDIvol和SSDE分別為(2.699±0.166)m Gy和(6.394±0.429)m Gy(t=-66.191,P0.001),C組CTDIvol和SSDE分別為(2.516±0.232)m Gy和(5.727±0.640)m Gy(t=-32.653,P0.001),D組CTDIvol和SSDE分別為(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,且隨著年齡增長差值越大,SSDE之間差值較CTDIvol之間差值更大。另采用Pearson相關(guān)分析對體重及CTDIvol、DLP、ED*、SSDE進(jìn)行相關(guān)性分析,結(jié)果顯示體重與CTDIvol之間無相關(guān)性(r=-0.138,P0.05),而與DLP、ED*、SSDE存在相關(guān)性(r分別為0.232、0.232、-0.422,P0.01)。結(jié)論 CTDIvol明顯低估了患兒所受的輻射劑量,SSDE能夠更準(zhǔn)確地反映不同體型患兒進(jìn)行心臟CT掃描時實際接受的輻射劑量。
[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. 緇撴灉 A緇凜TDIvol鍜孲SDE鍒嗗埆涓，

本文編號：1940276