An approach to estimate the characterizations of mmulti-detector CT
10.3969/J.ISSN.1672-8270.2016.07.001
- VernacularTitle:CT剂量指数估算方法研究
- Author:
Jingwen ZHUANG
;
Junzheng ZHENG
;
Mei BAI
- Publication Type:Journal Article
- Keywords:
Multi-detector CT;
CT dose index;
Correction coefficient
- From:
China Medical Equipment
2016;13(7):1-3,4
- CountryChina
- Language:Chinese
-
Abstract:
Objective: The purpose of the current study was to investigate the correction coefficient of the characterizations of multi-detector CT (MDCT). Methods: The dose profile of Siemens SOMATOM Definition Flash CT scanner was measured with CT-SD 16 detector under the conditions of different collimations, pitches and tube voltages in phantoms of different diameters, and the ratio between weighted CTDI∞and weighted CTDI100 was calculated. Results:The ratio between weighted CTDI∞and weighted CTDI100, which is growing for increasing beam collimation, was found to range from 1.123 to 1.162 in head phantom and range from 1.118 to 1.173 in body phantom. Conclusion: For MDCT, the use of CTDI100, which is one of the most commonly used characterizations of CT, has always underestimated the levels of radiation dose. Therefore, CTDI100 should be corrected.
