A fully automated calculation of size-specific dose estimates (SSDE) in thoracic and head CT examinations

13th South-East Asian Congress of Medical Physics 2015

物理学;医药卫生

Anam, C.^1,2 ; Haryanto, F.^2 ; Widita, R.^2 ; Arif, I.^2 ; Dougherty, G.^3

Department of Physics, Faculty of Mathematics and Sciences, Diponegoro University, Indonesia^1

Department of Physics, Faculty of Mathematics and Natural Science, Institut Teknologi Bandung, Indonesia^2

California State University (CSU) Channel Islands, CA, United States^3

关键词: Adult patients;    Dose estimates;    Effective diameter;    Fully automated;    Imaging protocol;    Patient images;    Tube current modulations;    Water equivalent;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/694/1/012030/pdf
DOI  :  10.1088/1742-6596/694/1/012030

学科分类：卫生学

来源: IOP

【 摘 要 】

The purpose of this study is to automatically calculate and then investigate the size- specific dose estimate (SSDE) in thoracic and head CT examinations undertaken using standard imaging protocols. The effective diameter (Deff), the water equivalent diameter (Dw), and the SSDE were calculated automatically from patient images. We investigated sixteen adult patients who underwent a CT head examination and thirty adult patients who underwent a CT thorax examination. Our results showed that the Dwvalue in the thoracic region was 4.5% lower than the value of Deff, while the Dwvalue in the head region was 8.6% higher than the value of Deff. The relationships between diameter (Deffand Dw) and CTDIvolwere distinctive. In the head region, decreasing the patient diameter resulted in a constant CTDIvoldue to the tube current modulation (TCM) being off, while in the thoracic region decreasing the patient diameter resulted in a decrease in value of CTDIvoldue to TCM being on. In the head region, decreasing the patient diameter resulted in an increase in the value of SSDE, while in the thoracic region decreasing the patient diameter resulted in a decrease in the value of SSDE.