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目的比较肺部体检CT扫描中采用低剂量扫描和常规扫描两种方式对人体主要器官造成的吸收剂量,为低剂量肺部扫描的临床运用提供科学依据。方法采用标准人人体模型,分别用单排CT和16排CT,按设定的保证摄片效果的常规扫描条件和低剂量扫描条件进行肺部体检扫描,分析不同扫描条件下对主投照器官肺部以及邻照器官骨髓、肝脏造成的吸收剂量。结果常规扫描方式在人体主要器官各位点的照射剂量显著高于低剂量扫描方式,16排CT扫描相对于单排CT扫描在获得同等价值的图像效果的基础上对机体的受照剂量显著降低。结论日常体检中采用低剂量扫描方式比常规扫描方式对减少患者的受照剂量具有积极的意义,且多排CT效果更为明显。
OBJECTIVE: To compare the absorbed dose caused by low-dose scanning and conventional scanning on the main organs of human body in lung CT scan, which provides a scientific basis for the clinical application of low-dose lung scan. Methods The standard human body model was used to scan the lungs with single-slice CT and 16-slice CT respectively according to the normal scanning conditions and the low-dose scanning conditions which were set to ensure the radiographic effect. The effects of different scanning conditions on the main projection organs Lung and adjacent organs bone marrow, liver caused by the absorbed dose. Results Compared with the low-dose scanning method, the radiation dose of all the major organs in the routine scanning mode was significantly lower than that of the single-row CT scanning method in obtaining equivalent imaging results. Conclusion The routine examination of low-dose scanning method than conventional scanning method to reduce the patient’s dose has a positive meaning, and multi-row CT effect is more obvious.