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目的选择儿童(学龄期和青春期)CT最佳扫描剂量,既要避免剂量过高也要避免出现扫描失败而重复扫描。方法采用尸体实验和成人198例大样本病例对照,最后,参照动物试验结果以成人最低剂量为起点逐步降低剂量值,应用于必需进行CT检查的儿童,以不选用儿童志愿者的方法进行研究。结果儿童普通多层螺旋颈椎扫描在满足诊断要求的前提下扫描剂量降低的最低限度是120kV;70mAs。结论在达到与成人一致的图像质量时,儿童所需的X射线剂量比成人低,在一定范围内降低管电流和管电压即可以减低辐射剂量又不影响图像质量。儿童CT检查不可再沿用成人的剂量标准。
Objective To select the optimal CT scan dose for children (school age and adolescence) to avoid overdosaging and to avoid repeated scans with failed scanning. Methods A total of 198 cases of adult patients were included in the study. Finally, according to the results of the animal experiment, the dose was gradually reduced from the lowest adult dose, and used in children who had to undergo CT examination. Results The lowest scan dose was 120kV and 70mAs in children with common multi-slice spiral cervical spine scanning under the premise of meeting the diagnostic requirements. Conclusions Children achieve lower X-ray doses than adults when achieving image quality that is consistent with adults. Reducing tube current and tube voltage over a range can reduce radiation dose without affecting image quality. Children’s CT examination can no longer follow the adult dosage standards.