| Yang Dewu,Sui Yan,Liu Kang,Niu Yantao.Effects of organ dose modulation technique on image quality and radiation dose in sinus CT scanning[J].Chinese Journal of Radiological Medicine and Protection,2022,42(3):230-234 |
| Effects of organ dose modulation technique on image quality and radiation dose in sinus CT scanning |
| Received:October 10, 2021 |
| DOI：10.3760/cma.j.cn112271-20211010-00407 |
| KeyWords:Organ dose modulation Sinus Eye lens Radiation protection Image quality |
| FundProject: |
| Author Name | Affiliation | E-mail | | Yang Dewu | Department of Medical Technique, Beijing Health Vocational College, Beijing 102433, China | | | Sui Yan | Department of Radiology, Fuxing Hospital, Capital Medical University, Beijing 100038, China | | | Liu Kang | Department of Radiology, Fuxing Hospital, Capital Medical University, Beijing 100038, China | | | Niu Yantao | Department of Radiology, Beijing Tongren Hospital, Capital Medical University, Beijing 100730, China | ytniu163@163.com |
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| Abstract:: |
| Objective To investigate the effects of organ dose modulation (ODM) on image quality and radiation dose to lens during sinus CT scanning. Methods The GE Revolution EVO CT was used to scan the anthropomorphic head with ODM turned off as the control group and ODM turned on as the observation group. With different parameter combinations of tube voltage (140, 120, 100 kV), noise index (N17, N18), pitch (0.531, 0.969 at 20 cm collimation width, 0.516, 0.984 at 40 mm collination width), 24 series of images were acquired respectively. The tube current (mA) valuesat the anterior (A), left (L), posterior (P) and right (R) positions, volume CT dose index (CTDIvol) and dose length product (DLP) were recorded. Average CT values (AV), standard deviation (SD), signal-to-noise ratio (SNR), contrast to noise ratio (CNR) and image quality factor (FOM) of ROI were calculated. Double blind method was used to evaluate the edge sharpness, soft tissue level, noise and artifact on a subjective scale of 3 points. Results For the combinations of different scanning parameters, the radiation dose of the observation group was lower than that of the control group. The tube current attheposition A for the observation group was lower than that of the control group, and the difference was statistically significant (t=2.28, P<0.05). The differences oftube currentsatposotions of L, P and R,CTDIvol and DLP values in twogroupswere not statistically significant (P>0.05). There were no significant differences in SD, SNR, CNR and FOM between the two groups of images (P>0.05). There were no significant differences in the subjective scores of edge sharpness, soft tissue gradation, noise and artifacts between the two groups (P>0.05). ODM technique can effectively reduce the radiation dose of eye lens without decompromising the image quality, which could meet the requirements of diagnosis, and accord with the principle of radiological protection optimization. |
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