摘要
Abstract
Objective To explore effect of parameter changes on radiation dose of head CT scans in children and clinical value of CT scanning parameter optimization. Methods A total of 300 patients of different ages with suspected cranial diseases , who would take CT scaning were divided into 3 groups by the tube voltage, tube current and pitch of scanning parameters: group A with the voltage change (80-120 KV) , changeless pitch and tube current; group B with change of tube current ( 100-300 mA) , changeless tube voltage and pitch; group C with pitch change (0.8-1.5 mm) , changeless tube voltage and tube current. CT dose weighted index numbers ( CTDIw) of the 3 groups were compared. Results The CTDIw were( 10.236 ±0.356) , (21.446±0.815) and (34.512 ±0. 736) mGy respectively in group A, when tube voltages were 80, 100 and 120 KV correspondingly; the CTDIw were(12.293 ±0.226) , (23.446 ±0.915) and (35.842±0.736)mGy respectively in group B, when the tube currents were 100, 200 and 300 mA correspondingly; the CTDIw were(44. 246±0. 126) , (35. 446 ±0. 815) and (23. 842 ±0.736) mGy respectively in group C; when the pitches were 0.8, 1.0 and 1.5 mm correspondingly, the differences of the three groups were statistically significant (P < 0. 05). Conclusion On the premise of ensuring the quality of diagnosis, appropriate reductions of tube voltage and tube current, and increase of pitch in head CT examination for children can significantly reduce radiation dose.关键词
儿童/头部/体层摄影术,螺旋计算机Key words
Child/ Head/ Tomography, spiral computer分类
医药卫生
