Radiation Dose from Computed Tomography Scanning of the Brain in Patients at Sakaeo Crown Prince Hospital.
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Abstract
Background: Over recent years, using computerized tomography (CT scan) is increased because of its short study time with high quality images. Disadvantage of CT scan is radiation delivered during procedure, and concern with biological effect, cancer risk. Therefore, monitoring radiation dose is important to promote optimization in CT scan.
Objective: To obtain radiation dose values of CT scan of the brain using CT dose index volume (CTDIvol) and dose length product (DLP).
Methods: Retrospective descriptive study of stratified randomly selected CT scans of 327 patients performed CT brain without contrast and 146 patients performed CT brain with contrast enrolled between 1st July 2022 to 31st December 2022. CTDIvol and DLP values were collected and analyzed using mean, standard deviation, median, interquartile range. The third quartile was analyzed to yield diagnostic reference levels (DRLs) of CTDIvol and DLP. The DRLs were compared to Thai national DRLs and international DRLs.
Results: The mean (standard deviation), median, interquartile range of patients performed CT brain without contrast were 93.8(46.6), 69.7, 52.3 for CTDIvol and 1968.1(1143.1), 1489.1, 1019.2 for DLP. The mean (standard deviation), median, interquartile range of patients performed CT brain with contrast were 91.6(44.4), 69.7, 63.4 for CTDIvol and 1909.7(832), 1475.1, 1208.1 for DLP. The DRLs of CT brain without contrast were 122 mGy(CTDIvol) and 2508.3 mGy.cm(DPL) and The DRLs of CT brain with contrast were 126.8 mGy(CTDIvol) and 2584.6 mGy.cm(DLP).
Conclusions: The DRLs of both CT brain without contrast and CT brain with contrast were higher than Thai national DRLs and international DRLs.
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