目的：探讨迭代重建技术在确保图像质量的前提下降低受检者辐射剂量的程度和有效性，确定iCT适宜胸部CT低剂量扫描方案。方法：前瞻性收集我院行胸部CT平扫检查的受检者180例，并将其依次分成6组，分别接受不同剂量的CT扫描。比较各组受检者胸部CT各组织CT值及其标准差的差异，客观评价其图像质量。结果：肺及骨组织标准差A2、B、C三组间均未见显著性差异。A1组与D组间亦未见显著性差异，但两组与E、F间均具有显著性差异。肺组织标准差B、C组与A1组间未见显著性差异，但A1组与A2组间具有显著性差异。肌肉组织标准差A1组和C组间、主动脉标准差A1组和B组间未见显著性差异，其余各组间均具有显著性差异，其标准差按A2、B、A1和C、D、E、F组呈现依次递增的趋势。结论：iCT采用的 iDOSE4迭代重建算法能有效降低受检者的辐射剂量，120 kV/100 mAs是该设备适宜的胸部CT低剂量扫描方案。
Abstract
Objective: To investigate the effectiveness of reducing radiation dose in chest CT without compromising the image quality, by using iterative reconstruction technique(iDOSE4). Methods: Totally 180 subjects who underwent chest CT scanning were divided into 6 dose groups in turn. Different groups represent different scanning conditions. Compared the different tissue CT number between different groups. Results: The differences of standard deviation in lung and bone markings among A2 group, B group and C group were not statistically significant. The differences of standard deviation in lung and bone markings between A1 group and D group were not statistically significant, but this two groups have significant difference with E group and F group. The standard deviation in muscle markings between A1 group and C group, and in the main artery markings between A1 group and B group have no significant differences, but there were significant differences among other groups. And the standard deviation increased in the order of A2, B, A1 and C, D, E, F. Conclusion: Philip iCT can effectively reduce the radiation dose by using iterative reconstruction technique(iDOSE4), and 120 kV/100 mAs can be used as the suitable low-dose chest computed tomography scanning protocol.
关键词
胸部疾病 /
体层摄影术 /
螺旋计算机
Key words
Thoracic diseases /
Tomography, spiral computed
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