论文部分内容阅读
【目的】探讨在图像处理器(GPU)提高 SAFIRE 重建速度的基础上,探寻满足诊断需求的颞骨低剂量扫描方案。【方法】选择本院行颞骨 CT 扫描的成年患者80例,随机分为对照组(行常规扫描,管电压120 kV,管电流120 mAs)和观察组(管电压80 kV,管电流120 mAs),每组40例；对照组图像进行常规 FBP 重建,观察组行常规的 FBP、SAFIRE 重建和经过 GPU 处理的 SAFIRE 重建。分别记录两组的剂量长度乘积(DLP)计算出有效辐射剂量 ED,记录两组患者重建方法需要的时间,测量图像的噪声(SD)和 CT 值并计算出信噪比(SNR),用统计学方法对所测的数据进行分析。【结果】观察组的有效辐射剂量较对照组低；经 FBP 重建后,观察组 SD 值较对照组明显升高,SNR 值明显降低,差异均具有统计学意义(均 P <0.05)；观察组经 SAFIRE 重建后图像 SD 较 FBP重建明显降低,SNR 明显升高,且差异具有统计学意义(均 P 0.05)。【结论】颞骨以管电压80 kV,管电流120 mAs 的 CT 扫描后的图像经 SAFIRE 重建后完全能满足诊断需求,且明显降低了辐射剂量,GPU 可明显降低 SAFIRE 重建时间,提高工作效率。“,”Objective]To search the available scanning program of temporal bone to reduce radiation dose and meet the diagnostic requirements upon the Graphic processing unit (GPU)improvement of the speed of SAFIRE reconstruc-tions.[Methods]80 cases of adult patients with temporal bone CT scan in our hospital were selected and randomly as-signed to the control group (routine scanning,120 kV tube voltage,tube current 120 MAS)and the observation group (80 kV tube voltage,tube current 120 MAS),each group of 40 cases.The control group images were reconstructed by conventional FBP,and the observation group was treated with conventional FBP,SAFIRE and SAFIRE reconstructed by GPU.The dose length product (DLP)of the two groups were recorded to calculate the effective radiation dose of ED,and the time of the reconstruction method was recorded,the noise (SD)and CT values of the images were recorded,and the signal to noise ratio (SNR)was calculated.All data were analyzed by statistical methods.[Results]The effective radiation dose in observation group was lower than that in control group,and the SD value in the observation group was significant-ly higher than that in control group,SNR significantly decreased,the difference was statistically significant (P <0.05), and the SD of the observation group was significantly lower than that of FBP reconstruction,SNR was significantly in-creased,and the difference was statistically significant (P <0.05);After SAFIRE reconstruction,the images of the ob-servation group were significantly lower than that of SD reconstruction,and the SNR was significantly higher,and the difference was statistically significant (P 0.05).[Conclusion]The scanning program (80KV,120mAs)of temporal bone reconstructed by SAFIRE can meet the diagnostic requirements and reduce the radiation dose obviously,and GPU can reduce the time of reconstruc-tion and improve the work efficiency.