| Zhang Yongxian,Niu Yantao,Guo Senlin,Liu Dandan,Yu Binbin,Kang Tianliang,Xian Junfang.Influence of CT scanning mode on the variability of radiation dose measurements of superficial organs[J].Chinese Journal of Radiological Medicine and Protection,2021,41(12):956-960 |
| Influence of CT scanning mode on the variability of radiation dose measurements of superficial organs |
| Received:May 05, 2021 |
| DOI：10.3760/cma.j.issn.0254-5098.2021.12.014 |
| KeyWords:Radiation dose Image quality Superficial organ dose |
| FundProject: |
| Author Name | Affiliation | E-mail | | Zhang Yongxian | Department of Radiology, Beijing Tongren Hospital, Capital Medical University, Beijing 100730, China | | | Niu Yantao | Department of Radiology, Beijing Tongren Hospital, Capital Medical University, Beijing 100730, China | ytniu163@163.com | | Guo Senlin | Department of Radiology, Beijing Tongren Hospital, Capital Medical University, Beijing 100730, China | | | Liu Dandan | Department of Radiology, Beijing Tongren Hospital, Capital Medical University, Beijing 100730, China | | | Yu Binbin | Department of Radiology, Beijing Tongren Hospital, Capital Medical University, Beijing 100730, China | | | Kang Tianliang | Department of Radiology, Beijing Tongren Hospital, Capital Medical University, Beijing 100730, China | | | Xian Junfang | Department of Radiology, Beijing Tongren Hospital, Capital Medical University, Beijing 100730, China | |
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| Abstract:: |
| Objective To investigate the uncertainty of the dose measurements of superficial organs and the image noise in CT scanning. Methods GE Revolution CT was used to perform 20 repeated scans on the isolated skull specimen in sequential and helical mode. The chest phantom was scanned for 45 times with the pitch 1.0 and the collimation 80 mm for two scanners (GE Revolution CT, Philips Brilliance iCT) and 40 mm for the Siemens Somatom Definition Flash CT. The volume CT dose index (CTDIvol) was maintained during the above scannings. A dosimeter was used to measure the dose at the position of the right eye lens of the specimen and the center of right breast of the chest phantom. The position of dosimeter sensor remained unchanged. The standard deviation of CT values (image noise) in the air region of cross-sectional images at the center of the sensor reconstructed with lung/soft tissue algorithms were measured. The mean values (Av), standard deviations (SD), coefficients of variation (CV) and relative ranges (RR) of the dosimetric values and the standard deviations of CT values of 3, 5, 10, 20, 30 and 45 scans were calculated. Pearson and Spearman correlation analysis were used to evaluate the correlation between the dosimetric values and the standard deviations of CT values. Results The measured dosimetric values of the skull specimen were almost unchanged in the sequential scannings. The relative range of dose in helical mode was 10.67%. The relative ranges of the measured values of the three CT scanners for 45 scans reached 43.83%, 25.31%, and 14.32%. The standard deviations of CT values of the lung/soft tissue images varied greatly and the differences were not completely related to the dosimetric values. Conclusions The dosimetric values of superficial organs were stable in the sequential scanning mode. The dose measurements of superficial organs and the image noise changed greatly in helical scanning mode. |
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