新生儿颅脑低剂量螺旋CT扫描技术研究

发布时间：2018-03-23 13:45

本文选题：新生儿　切入点：多层螺旋CT　出处：《成都医学院学报》2016年04期

【摘要】：目的探讨64排128层螺旋CT检查新生儿颅脑低剂量扫描方案的可行性。方法采用数字表法,将连续受检的123例新生儿(77例足月新生儿和46例早产儿)随机分为3组,分别行颅脑常规剂量及低剂量扫描,扫描管电压均为120kv,管电流分别为150mAs、40mAs及30mAs。比较3组CT吸收剂量指数(CTDIw)、剂量长度乘积(DLP)及图像质量差异。结果低剂量组X线吸收剂量明显减低。随管电流降低,3组被试图像质量逐渐降低(P0.001),不合格图像逐渐增加,但40mAs组与常规组可满足诊断要求的图像数量比较,差异无统计学意义(P0.05);30mAs组的足月新生儿不合格图像较多,而30mAs组和40mAs组可满足诊断要求的早产儿图像数量比较,差异无统计学意义(P0.05)。结论 128层螺旋CT 40mAs及30mAs新生儿颅脑扫描可满足临床诊断需求,能有效降低新生儿的辐射剂量,40mAs及30mAs扫描法可分别作为足月儿及早产儿颅脑CT检查的首选方案。
[Abstract]:Objective to investigate the feasibility of 64-slice 128-slice spiral CT in brain low-dose scanning of neonates. Methods 123 newborns (77 full-term and 46 preterm) were randomly divided into 3 groups by digital table method. Routine and low-dose craniocerebral scans were performed respectively. The voltage of scanning tube was 120kv, the current of the tube was 150mAs-40mAs and 30mAs respectively. The CT absorptive dose index (CTDIWN), dose length product (DLPP) and image quality were compared among the three groups. Results the amount of X-ray absorbent in the low dose group was significantly lower than that in the control group, and with the decrease of the tube current, there was a significant decrease in the amount of X-ray absorbent in the three groups. The quality of the image decreased gradually, and the substandard image increased gradually. However, there was no significant difference between the 40mAs group and the routine group in the number of images that could meet the diagnostic requirements. There was no significant difference in the number of images of the term newborns in the P0.05mAs group, while the number of images of the premature infants in the 30mAs group and the 40mAs group could meet the diagnostic requirements. Conclusion 128-slice spiral CT 40mAs and 30mAs can meet the needs of clinical diagnosis. The method of 40 Mas and 30mAs scan can be used as the first choice for brain CT examination of term infants and premature infants respectively.
【作者单位】：成都医学院第一附属医院放射科;解放军第37医院放射科;
【分类号】：R816.92

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