To investigate the effect of scan table on CT size-specific dose estimate in children
10.3760/cma.j.issn.0254-5098.2019.07.011
- VernacularTitle:CT扫描床对受检患儿体型特异性辐射剂量估计方法影响的初步研究
- Author:
Wei PENG
1
;
Tiao CHEN
;
Tian LIAO
;
Zhaoxi ZHANG
;
Lili ZHENG
;
Hao CHEN
;
Yaoyao HE
;
Zilong YUAN
Author Information
1. 湖北省肿瘤医院放射科
- Keywords:
Water equivalent diameter;
Size-specific dose estimate;
Children;
Radiation dose;
Computed tomography
- From:
Chinese Journal of Radiological Medicine and Protection
2019;39(7):539-543
- CountryChina
- Language:Chinese
-
Abstract:
Objective To investigate the effect of scan table on size-specific dose estimate ( size-specific dose estimate, SSDE) in children's CT scan. Methods CT imaging data and CTDIvol of 44 children ( 15 heads, 13 chests, 16 abdomen-pelvis) who underwent Siemens SOMATOM Definition AS+ 64 row 128-slice CT scan were retrospectively collected. CTDIvol of each patient was recored, WED ( water equivalent diameter) was calculated by two different methods ( with or without table) , donated as WED-T and WED-NT, then the corresponding SSDEWED ( SSDEWED-T and SSDEWED-NT ) was calculated. And the SSDEWED-NT was used as reference to evaluate the difference between WED and SSDEWED obtained by two different methods. Results Including part of table will lead to the overestimate for WED, with mean differences of 0. 10％, 2. 82％ and 2. 54％ for head, chest and abdomen-pelvis, respectively, while SSDEWED will be underestimated by 0. 06％ ( head ) , 2. 70％ ( chest ) and 1. 59％ ( abdomen-pelvis ) . Conclusions Including par of the patient table has a certain effect on SSDEWED for children, more attention should be paid for the application of SSDEWED.
