Mr. Assessment of Patient Dose Undergoing CT-Brain Examination at Sunpasitthiprasong Hospital
Keywords:
CTDIvol, DLP, Effective Dose, Diagnostic reference levels, computed tomographyAbstract
Background: CT Brain examination is the predominant diagnostic radiology procedure used to identify abnormally about brain parenchyma. Its utilization is increasing in various medical settings. This examination can be performed with precision to determine about brain hemorrhages and location of the brain tumor. Currently, Sunpasitthiprasong Hospital does not have established local DRLs for CT Brain exams. Hence, the aim of this study was to conduct a survey and establish the local DRLs for the CT Brain exams. Additionally, it aimed to assess the radiation dose received by patients from CT brain exams and compare the obtained DRLs with the Thai national DRLs and those of other countries.
Materials and Method: The following data represents the retrospective survey of CT Brain exams data included 210 patients (94 females and 116 males) in 1 to 31 December 2022. The 75th percentiles of the volumetric computed tomography dose index; CTDIvol, dose length product; DLP and scan mode were obtained from the MDCT 128 slices (GE Optima 660 and MDCT 32 slices (Cannon Aquilion Lightning). The effective dose (Deff) was then determined for each CT study
Results: 210 patients were included. Mean age of the patients were 55.29 ± 18.38 years. The DRLs for CTDIvol, DLP and Deff from CT Brain NC (1 phase) were 37.6 mGy, 700.9mGy.cm and 1.61 mSv, respectively. The radiation doses from CT Brain CE (2 phase) (NC, V) were CTDIvol (58.8, 58.8) mGy, DLP (total) 1948.2 mGy-cm and Deff 4.48 mSv.
Conclusions: The radiation dose from CT Brain NC below the Thai national DRLs and those of other countries, but the CT Brain CE indicates that it is greater compared to the standards set by the Thai National and other nations. Hence, it is necessary to modify the local DRLs for CTDIvol of CT Brain CE in future. Consequently, it is necessary to review and adjust the parameters (kVp, mAs, Pitch) of the CT Brain CE protocol in order to reduce the radiation dose experienced by patients.
