摘要
目的分析儿童先天性心脏病接受双源cT扫描时辐射剂量。方法70例患儿，年龄1个月至8岁，均接受双源CT胸部增强扫描。将患儿按年龄分为〈1岁组（44例）、1—5岁组（14例）、〉5岁组（12例），使用方差分析比较3个年龄组的双源CT检查辐射剂量，再使用SNK检验两两组间差异；使用多元线性回归分析剂量长度乘积（DLP）与年龄、体重、管电压、管电流、螺距、扫描层数间的关系。结果70例患儿双源cT辐射剂量为DLP=（144．46±74．07）mGy·cm，有效剂量（ED）=（4．68±2．34）mSy。3个年龄组DLP均不完全相同[〈1岁组（104．00±56．26）mGy·cm，1～5岁组（199．00±76．22）mGy·cm，〉5岁组（208．00±73．87）mGy·cm，F=8．26，P=0．0009I，〈1岁组与1～5岁组，〈1岁组与〉5岁组差异均有统计学意义（q值分别为5．21、6．52，P值分别为0．009、0．004），1—5岁组与〉5岁组间差异无统计学意义（q=0．28，P=0．48）。3个年龄组ED[≤1岁组中位数为3．20mSv，1～5岁组为（5．17±1．98）mSv，〉5岁组为（3．74±1．33）mSv，F=0．54，P=0．59]，差异没有统计学意义。DLP与年龄（中位数为4．3岁，r=0．54186，P=0．0008）、体重（中位数为12．1kg，r=0．56371，P：0．0004）、管电压[（95．48±6．99）kV，r=0．63269，P〈0．01]、管电流[（138．55±40．67）mA，r=0．79608，P〈0．01]、扫描层数[（236．10±46．51）层，r=0．72192，P〈0．01]均呈正相关，与螺距（0．48±0．03，r=-0．46693，P=0．0047）呈负相关。结论1岁以上先天性心脏病患儿接受双源CT检查的DLP显著高于1岁以下患儿，但由于1岁以下患儿的ED系数高于其他各组，各年龄组ED差异无统计学意义。
Objective To evaluate the radiation dose from enhanced dual-source computed Tomography（DSCT） scan on children with congenital heart disease（CHD）. Methods Seventy children with CHD, age from 1 month to 8 years old, were scanned with enhanced DSCT. Children were divided by age into 〈 1 year old group, 1--5 years old group, 〉 5 years old group. The differences among three groups were tested by F test. Then, the SNK test was used to compare the difference between each group. Multiple linear regression analysis was used to test the relationship of dose length product （DLP） with the age, weight, voltage, current, pitch and scan sheet. Results The average value of DLP was （144. 46 ± 74. 07） mGy · cm for all theT0 cases, and that of effective does（ED） was （4. 68 ±2. 34） mSv. There were significant differences of DLP among the 3 groups [ 〈 1 year （ 104. 00 ± 56. 26 ） mGy ·cm, 1--5 years （199.00±76.22） mGy. cm, 〉5 years （208.00±73.87） mGy-cm, F=8.26, P=0.0009]. TheSNK test showed statistical differences of DLP between 〈 1 year old group and 1-5 years old group, and between 〈 1 year old group and 〉 5 years old group （ q = 5.21,6. 52, P = 0. 009,0. 004 ）. The difference of DLP between 1-5 years old group and 〉 5 years old group did not reach significant （ q = 0. 28, P = 0. 48 ）. The differences of ED was not statistically significant among the three groups [ 〈 1 year 3.20 mSv, 1-5 years （5. 17 ±1. 98） mSv, 〉5 years（3.74 ±1.33） mSv,F =0. 54,P =0. 591. DLP was positively correlatedwith age （4.3 years,r=0.541 86, P= 0.0008）, weight （12. 1 kg,r =0.563 71, P= 0. 000d）,vohage [（95.48±6.99） kV,r=0.632 69, P〈0.01], current [（138.55 ±40.67） mA,r=0.796 08, P〈 0. 0001 ] and scan sheet （236. 10 ±46. 51, r = 0. 721 92, P 〈 0.01 ）. DI,P was negative correlated with pitch （0.48±0.03,r= - 0.46693, P= 0.0047）. Conclusion Higher DLP was observed in children over 1 year old under enhanced DSCT scan, but ED was not statistically significant among the three groups due to the higher K value in the children under 1 year old.
出处
《中华放射学杂志》
CAS
CSCD
北大核心
2011年第1期18-21,共4页
Chinese Journal of Radiology
