Influence of different exposure modes on image quality and radiation dose after knee replacement surgery X-ray photography
10.3760/cma.j.issn.0254-5098.2016.07.015
- VernacularTitle:膝关节置换术后X射线摄影中不同曝光模式对影像质量和辐射剂量的影响
- Author:
Qitong LIU
;
Weiguo ZHANG
;
Tong CHEN
;
Tao JIANG
- Publication Type:Journal Article
- Keywords:
Total knee arthroplasty (TKA);
Radiation dose;
Exposure mode
- From:
Chinese Journal of Radiological Medicine and Protection
2016;36(7):548-552
- CountryChina
- Language:Chinese
-
Abstract:
Objective To study the optimal radiographic conditions for patients with knee arthroplasty (TKA) and the feasibility of clinical application.Methods According to the different exposure modes,including automatic exposure control (AEC) or manual exposure mode (FIXED),the human body specimen was exposed at a certain kV and different mA or mAs.The entrance surface dose (ESD) and dose exposure index(DEI) were recorded,and the subjective image quality was assessed.The test group with optimum parameters obtained with statistical analysis were compared with control group in radiation dose and subjective evaluation.Results In AEC group,ESD and kV showed a negative correlation (r =-0.973,P ＜ 0.05).At the same mA,DEI was firstly decreased and then increased with kV increasing.The subjective image quality score was (1.96 ± 0.56).DEI and physician ratings showed negative correlation (r =-0.840,P ＜ 0.05).In FIXED group,ESD increased with the increasing mAs (r=0.845,P＜0.05).DEI and kV,mAs indicated a positive correlation(r=0.845,P＜0.05).The subjective image quality scores was(4.33 ±0.79) without correlation with DEI.Compared with the control group,the subjective image quality scores of test group increased,and the radiation dose decreased significantly.Conclusion It is optimal using manual exposure mode with 80 kV/l.25-1 mAs,75 kV/2-1 mAs,70 kV/2.5-1.25 mAs,65 kV/3.2-1.6 mAs and 60 kV/3.2-2 mAs for patients with TKA.
