Application study of CARE Dose 4D technology and SAFIRE in tuberculosis by low dose CT examination
LIU Jun-zhong1, GENG Hai2
1.Weifang Medical University, Department of Radiology, Weifang No.2 People’s Hospital, Weifang Shandong 261041, China;
2.Weifang Medical University, Department of Radiology, Weifang People's Hospital, Weifang Shandong 261041, China
Abstract Objective: By studying the CARE Dose 4D technology combined use of SAFIRE technology in tuberculosis with low dose CT scan, to evaluate the value and significance of these two kinds of new technologies. Methods: All of 300 patients with secondary pulmonary tuberculosis were distributed into three groups, each group of tube voltage was 120 kV. All groups underwent SOMATOM Definition Flash CT scanning with the same series thorax routine(adult). Group A was enabled CARE Dose 4D mode with the reference tube current of 150 mAs, by using SAFIRE grade 3 for image reconstruction. Group B and group C were not enabled CARE dosed 4D mode, fixed mAs instead, respectively 150 mAs and 80 mAs. SAFIRE is not used but the FBP in image reconstruction. The qualities of the images were evaluated by two imaging physicians with double blind method. Record relevant parameters and dose indexes. All data were recorded and analyzed by using Statistics SPSS 19 statistical software. Results: In the subjective evaluation of image, consistency of the image quality evaluation of two physicians was very good(Kappa=0.819). In radiation dose contrast, compared with group B, The CTDIvol, DLP and ED of group A were low about 58.81%(t=20.383, P<0.05), 61.64%(t=7.894, P<0.05), 59.20(t=15.673, P<0.05). Compared with group C, The CTDIvol, DLP and ED of group A were low about 28.76%(t=12.981, P<0.05), 42.65%(t=4.762, P<0.05), 45.15%(t=11.764, P<0.05). The CTDIvol, DLP and ED values in group A were lower than group B and C, and the difference was significant statistically, The image quality of group C was obviously different from group A and group B. Compared the CT image noise level of group A and group B, there was no significant statistical difference(t=1.207, P>1.207). group A and group C(t=3.349, P<3.349), group B and group C(t=2.213, P<2.213) were statistically significant either. The signal to noise ratio of group A was substantially higher than that of group B and group C, and the contrast noise ratio was remarkably higher than the other two groups, higher than group B and group C were about 18.4% and 30.88%. The three groups were statistically significant. Conclusion: Combined use of CARE Dose 4D technology and Sinogram Affirmed iterative reconstruction technology, it can not only reduce the dose of CT radiation, but also ensure and improve the quality of imaging.
LIU Jun-zhong1,GENG Hai2. Application study of CARE Dose 4D technology and SAFIRE in tuberculosis by low dose CT examination[J]. JOURNAL OF CHINA MEDICAL IMAGING, 2017, 28(9): 660-664.
2017, Vol. 28 
