Research on influencing factors of geometric efficiency on MDCT
- VernacularTitle:多排螺旋CT几何效率影响因素初步研究
- Author:
Jingwen ZHUANG
;
Mei BAI
- Publication Type:Journal Article
- Keywords:
Multi-detector row computed tomography;
Geometric efficiency;
Radiation dose
- From:
China Medical Equipment
2014;(11):4-6
- CountryChina
- Language:Chinese
-
Abstract:
Objective:To investigate the dependence of geometric efficiency (GE) on beam collimation and tube voltage.Methods: The dose profile was measured under the conditions of different collimations and tube voltages and GE was calculated.Results: GE was found to be from 11% to 68%, GE at central position and periphery were found to range from 11% to 49% and 16% to 68% respectively, and weighted GE was found to be from 17% to 58%. GE was increased with beam collimation, while it was less pronounced on tube voltages.Conclusion:The dependence of GE on collimation was significant. Therefore, operators should choose appropriate collimations to reduce the dose burden of patients in CT examinations.
