|
Abstract 【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 reconstructions. 【Methods】 80 cases of adult patients with temporal bone CT scan in our hospital were selected and randomly assigned 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 significantly 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 increased, and the difference was statistically significant (P<0.05); After SAFIRE reconstruction, the images of the observation group were significantly lower than that of SD reconstruction, and the SNR was significantly higher, and the difference was statistically significant (P< 0.05); The image quality of the observation group was poor, but the image quality was only slightly lower than the A group after SAFIRE reconstruction, it can meet the diagnostic requirements; the SD value was slightly higher, and the SNR value was slightly lower, but the difference does not have statistical significance (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 reconstruction and improve the work efficiency.
|
|
Received: 24 April 2015
|
|
|
|
2015, Vol. 32 
