| HUA Jian-min,CHEN Gen-song,ZHANG Wei-ming.Studies on the application of low-dose CT in temporal bone scanning[J].Chinese Journal of Radiological Medicine and Protection,2006,26(5):530-532 |
| Studies on the application of low-dose CT in temporal bone scanning |
| Received:October 10, 2005 |
| DOI： |
| KeyWords:Temporal bone Low-dose Radiation Tomography X-ray computed |
| FundProject:浙江省卫生厅资助项目(2002B025) |
| Author Name | Affiliation | E-mail | | HUA Jian-min | Department of Radiology, The Second Affiliated Hospital, Zhejiang University, School of Medicine, Hangzhou 310009, China | zwem@mail.hz.zj.cn | | CHEN Gen-song | Department of Radiology, The Second Affiliated Hospital, Zhejiang University, School of Medicine, Hangzhou 310009, China | | | ZHANG Wei-ming | Department of Radiology, The Second Affiliated Hospital, Zhejiang University, School of Medicine, Hangzhou 310009, China | |
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| Abstract:: |
| Objective To investigate the influence of reducing mA on the diagnostic quality of image and the value of clinical application with high resolution CT (HRCT) in temporal bone. Methods Sixty patients performed with temporal bone coronal HRCT scan were randomly assigned into 100 mA group and 50 mA group. The two group images including coronal direct scan images and the corresponding axial images by multi-planar reconstruction(MPR)with different mA were obtained by using bone mineral density algorithm recombination. Evaluation criterion was as followed: clearly demonstrated (2 points), demonstrated but not visualized (1 points), or not seen (0 points). Points were performed according to left and right sides respectively. Results The CTDIw value with single scan of temporal bone HRCT decreased from 42.00 mGy (100 mA) to 21.00 mGy (50 mA) and the radiation dose to the temporal bone was reduced by 50%. Meanwhile there was no significant difference of image quality between the two mA in coronal direct scan (P>0.05). Furthermore, temporal bone low-dose HRCT could basically reach the isotropy. Axial images by MPR could display the small anatomic structure of temporal bone clearly, which ensured the detectable rate of focus. Conclusions The radiation dose of patients could be obviously decreased by reducing mA and using MPR technology in place of direct scans of temporal bone. Temporal bone HRCT with 50 mA could provide enough image information for the diagnosis. |
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