Patient radiation dose from computed tomography angiography and digital subtraction angiography of the brain

13th South-East Asian Congress of Medical Physics 2015

物理学;医药卫生

Netwong, Y.^1 ; Krisanachinda, A.^1

Department of Radiology, Faculty of Medicine, Chulalongkom University, Bangkok, Thailand^1

关键词: 3D rotational angiography;    Cerebral vessels;    Computed tomography angiography;    Digital subtraction angiography;    Effective dose;    Flat panel detectors;    Patient radiation dose;    Standard protocols;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/694/1/012041/pdf
DOI  :  10.1088/1742-6596/694/1/012041

学科分类：卫生学

来源: IOP

【 摘 要 】

The 64-row multidetector computed tomography angiography (64-MDCTA) provides vascular image quality of the brain similar to digital subtraction angiography (DSA), but the effective dose of CTA is lower than DSA studied in phantom. The purpose of this study is to evaluate the effective dose from 64-MDCTA and DSA. Effective dose (according to ICRP 103) from 64-MDCTA and DSA flat panel detector for cerebral vessels examination of the brain using standard protocols as recommended by the manufacturer was calculated for 30 cases of MDCTA (15 male and 15 female).The mean patient age was 49.5 (23-89) yrs. 30 cases of DSA (14 male and 16 female), the mean patient age was 46.8 (21-81) yrs. For CTA, the mean effective dose was 3.7 (2.82- 5.19) mSv. For DSA, the mean effective dose was 5.78 (3.3-10.06) mSv. The effective dose of CTA depends on the scanning protocol and scan length. Low tube current can reduce patient dose whereas the number of exposures and number of series in 3D rotational angiography (3D RA) resulted in increasing effective dose in DSA patients.