螺旋CT低剂量扫描在新生儿腹部检查中的应用研究

目的:评价新生儿腹部单排螺旋CT低剂量与常规剂量扫描图像质量,探讨低剂量扫描在新生儿应用的可行性。方法:对高度怀疑腹部病变的足月新生儿150例和早产儿90例,随机各分3组行常规(150mAs)及低剂量(40mAs、30mAs)腹部CT扫描,观察比较其对腹部正常结构的显示差异。结果:图像质量评价结果:足月新生儿150mAs,40mAs扫描获得的可诊断图像,χ2检验,P>0.05,提示图像无显著性差异;30mAs的可诊断图像,χ2检验,P<0.05,提示图像质量有显著性差异。早产儿150mAs,40mAs,30mAs可诊断图像,χ2检验,P>0.05,提示上述剂量图像质量差异无显著性意义。结论:单排螺旋CT低剂量扫描适用于新生儿腹部检查,在保证图像质量的前提下,足月新生儿采用40mAs、早产儿采用30mAs左右的扫描条件较为适宜且有利于患儿的辐射防护。

Application of low-dose single-slice spiral CT scanning in abdomen examination of newborn

Objective： To evaluate the neonate abdominal images quality by single-slice spiral CT （SSCT） with low-dose and conventional parameters,and to study the feasibility of low-dose scan in the abdomen examination of newborn. Methods： One hundred and fifty cases mature neonates and 90 cases premature infants with suspected abdominal disease were selected and randomly divided into 3 groups ,then perform routine dose（150 mAs） and low dose（40 mAs,30 mAs）CT examination of newborn abdomen respectively, evaluated the presentation of the normal structure of each group. Results： Image quality evaluation： the percentage of the diagnostic image of mature neonate had no significant different between 150 mAs,40 mAs （ P 〉0.05） with x^2 test,and there was no significant different between 150 mAs, 40 mAs and 30 mAs images of premature infant. Conclusion： Low-dose SSCT scanning is suitable for abdomen examination of newborn. And it＇s suitable to choose tube current 40-30mAs in examination by SSCT for image quality assurance. And low-dose scanning also plays an important role in radioprotection.