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To investigate the effect of scan table on CT size-specific dose estimate in children / 中华放射医学与防护杂志
Article in Zh | WPRIM | ID: wpr-755005
Responsible library: WPRO
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.
Key words
Full text: 1 Index: WPRIM Language: Zh Journal: Chinese Journal of Radiological Medicine and Protection Year: 2019 Type: Article
Full text: 1 Index: WPRIM Language: Zh Journal: Chinese Journal of Radiological Medicine and Protection Year: 2019 Type: Article