| XIE Na,GAN Yun-gen,SHU Huang,LIN Fei-fei,LI Zhi-yong,SUN Jie.Clinical application of low-dose spiral CT for orthodontics[J].Chinese Journal of Radiological Medicine and Protection,2009,29(4):441-443 |
| Clinical application of low-dose spiral CT for orthodontics |
| Received:January 18, 2009 |
| DOI： |
| KeyWords:Orthodontics Tomography X-ray computed Image processing Radiation dosage |
| FundProject:深圳市科技局科技计划基金(200304193) |
| Author Name | Affiliation | E-mail | | XIE Na | Department of Radiology, Shenzhen Children's Hospital, Shenzhen 518026, China | xiena@139.com | | GAN Yun-gen | Department of Radiology, Shenzhen Children's Hospital, Shenzhen 518026, China | | | SHU Huang | 深圳市儿童医院放射科, 口腔科 | | | LIN Fei-fei | Department of Radiology, Shenzhen Children's Hospital, Shenzhen 518026, China | | | LI Zhi-yong | Department of Radiology, Shenzhen Children's Hospital, Shenzhen 518026, China | | | SUN Jie | Department of Radiology, Shenzhen Children's Hospital, Shenzhen 518026, China | |
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| Abstract:: |
| Objective To determine the effect of reducing the value of mA or kV on the image quality and the radiation dose of the patients undergoing low-dose spiral CT for orthodontics. Methods Thirty patients were divided into three groups, each group has 10 patients. They were group 1(80 kV and 200 mA), group 2 (120 kV and 80 mA), group 3 (120 kV and 200 mA) The volume CT dose index (CTDI) was recorded and the average dose-length produce (DLP) was calculated in three groups, respectively. Image quality of three groups were compared and scored by two radiologists, and the results were statistically analysed. Results The CTDI and DLP of 80 kV group (group 2) were 8.7 mGy and (36.80±3.60)mGy·cm, respectively, those of 80 mA group (group 3) were 19.6 mGy and (82.14±7.18)mGy·cm, respectively, and those of conventional-dose group (group 1) were 19.6 mGy and (82.14±7.18)mGy·cm,respectively. There was no significant difference among three groups in diagnostic image quality. Conclusions Low-dose spiral CT for orthodontics, especially the low-kV scan, may decrease the radiation exposure and guarantee the image quality. |
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