X-care技术在胸部CT扫描中对患者敏感器官保护作用的研究

摘要

ObjectiveTo discuss the protective effect of the X-care technique on the sensitive organs of patients when conducting chest scan with dual source CT.MethodsChest CT scan was conducted by dual source CT set with X-care scan mode and body surface detection method was used to measure the radiation dose of patients. Six detecting points were selected as regions of interest below the xiphoid of each patient, with 3 selected from surface side and 3 from dorsal side. Each detecting point has two detectors. The testing results were divided into two groups of surface side and dorsal side to compare their radiation dose, difference between surface side and dorsal side of single patient and depletion rate, as well as noise difference of anterior and posterior sides of both lungs. Statistics software SPSS13.0 was used to compare the radiation dose difference between two surface side and dorsal side, and result was statistically significant (P<0.05).ResultsThe surface side irradiation dose was 250.30mSv, the radiation dose of the dorsal side was 409.43mSv, and the average radiation dose was (7.82±2.91) mSv and (12.80±5.29) mSv. The surface side radiation dose reduced about 38.9% compared with that of the dorsal side (P<0.05). The anterior image noise was (82.55+3.75) Hu, and the noise was (82.55±3.75) Hu (P>0.05) in the posterior part of the lung. Signal to noise ratio were (12.34±3.43) and (12.45±3.42) (P>0.05) respectively, and the difference between image noise and signal to noise ratio has not statistical significance. ConclusionBy using X-care scan technique of dual source CT, on the premise of maintaining image quality, can significantly reduce radiation dose to the surface side of the subjects and protect the sensitive organs of subjects to some extent.%目的：探讨双源CT在进行胸部扫描时，使用X-care技术对患者敏感器官的保护作用。方法使用双源CT胸部X-care扫描模式进行胸部扫描，采用体表检测法测量患者所受辐射剂量，在每个患者在剑突下层面选取检测点6个检测点作为感兴趣区，其中面侧取3个，背侧取3个检测点作为感兴趣区。每个检测点放置2个探测器。扫描结束后将检测结果按面侧和背侧分成两组，比较两组接受辐照剂量，比较单个人面侧和背侧差异和减少率，以及两肺前后部的噪声差异。使用统计学软件SPSS13.0，采用两相关样本非参数检验比较面侧和背侧辐射剂量的差异，P<0.05为差异具有统计学意义。结果面侧辐照剂量总和250.30 mSv，背侧辐照剂量总和409.43 mSv，平均辐射剂量分别为（7.82±2.91）mSv、（12.80±5.29）mSv，面侧比背侧辐射剂量减少约38.9%（P<0.05）。肺前部图像噪声（82.55±3.75）HU，肺后部噪声（82.55±3.75）HU（P>0.05）。信噪比（Signal to Noise Ratio，SNR）分别为（12.34±3.43）、（12.45±3.42）（P>0.05），图像噪声和SNR的差异均不具有统计学意义。结论双源CT在进行胸部扫描时，使用X-care扫描技术，能够在保持图像质量的条件下，明显的减少受检者面侧接受的辐照剂量，对受检者的敏感器官具有一定的保护作用。