| LU Na,FENG Lin-chun,WANG Yun-lai,LIAO Xiong-fei,GE Rui-gang.Effective dose evaluation for linac-integrated kV cone beam CT[J].Chinese Journal of Radiological Medicine and Protection,2010,30(3):339-342 |
| Effective dose evaluation for linac-integrated kV cone beam CT |
| Received:June 09, 2009 |
| DOI：10.3760/cma.j.issn.0254-5098.2010.03.030 |
| KeyWords:Cone beam CT CT dose index Dose length product Effective dose |
| FundProject: |
| Author Name | Affiliation | E-mail | | LU Na | Department of Radiation Oncology, Chinese PLA General Hospital, Beijing 100853, China | | | FENG Lin-chun | Department of Radiation Oncology, Chinese PLA General Hospital, Beijing 100853, China | 301flc@163.com | | WANG Yun-lai | Department of Radiation Oncology, Chinese PLA General Hospital, Beijing 100853, China | | | LIAO Xiong-fei | Department of Radiation Oncology, Chinese PLA General Hospital, Beijing 100853, China | | | GE Rui-gang | Department of Radiation Oncology, Chinese PLA General Hospital, Beijing 100853, China | |
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| Abstract:: |
| Objective To evaluate the variations of effective doses with the preset scanning parameters from linac-integrated kV cone beam CT (CBCT).Methods Weighted CT dose index (CTDIW) were measured with PTW TM30009 CT ion chamber in head phantom and body phantom, respectively, for different combinations of tube voltage, mAs, collimator and gantry rotation range. Dose length products (DLP) were derived from CTDIW and effective doses (E) were calculated by the DLP and EDLP.Results CTDIW and effective dose had the quadratical relationship with tube voltage, depending linearly on product of tube current and exposure time. Effective dose had close relationship with the collimator and the gantry rotation range. Both the DLP and ED for CBCT were lower than the reference dose level recommended for conventional CT.Conclusions Effective dose from CBCT has a close relationship with the scanning parameters. Optimal imaging parameters should be chosen according to the patient's anatomy to reduce patient dose. |
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