Evaluation of the Patient Radiation Doses from Computed Tomography (CT) in Neurological Institute of Thailand

Authors

  • Sarayut Wonglao Neurological institute of Thailand

Keywords:

Diagnostic Reference Levels (DRLs), Volume Computed Tomography dose index (CTDIvol), Dose Length Product (DLP), Effective dose (E)

Abstract

Background: Neurological Institute of Thailand does not yet have the data collection of patients’ radiation doses from a computed tomography (CT) in adults. For comparison to Diagnostic Reference Levels (DRLs) from other countries. Objective: To evaluate the patient’s radiation doses received from a CT scan in adults. Method: The retrospective study of the patient’s radiation doses reported from PACS that we evaluate between October 2019 to March 2020. The data of 213 adult patients (100 males and 113 females) had standard body size (45-75 kg) in Thai people. The single phase studies were CT brain non contrast media (CT brain NC), CT brain with contrast media (CT brain CM), CT C-Spine, CT L-Spine, CT Angiogram (CTA) brain, and CTA carotid. The multi-phase studies were CT brain CM, CTA brain, and CTA carotid. We recorded and calculated data of the CTDIvol, DLP and effective dose (E) to show mean (SD), P50, P75 and range. Then P50 of each study was compared to other DRLs. Results: The P50 of the CTDIvol, DLP, and E for single phase CT brain NC was 47.52 mGy, 990 mGy-cm, and 2.08 mSv. CT brain CM was 45.37 mGy, 906.50 mGy-cm, and 1.90 mSv. CT C-Spine was 24.53 mGy, 560.50 mGy-cm, and 3.31 mSv. CT L-Spine was 14.94 mGy, 379 mGy-cm, and 5.69 mSv. CTA brain was 24.14 mGy, 279 mGy-cm, and 0.59 mSv. CTA carotid was 8.75 mGy, 327 mGy-cm, and 1.01 mSv, respectively. For multi-phase CT brain CM was 45.37 mGy, 1848 mGy-cm, and 3.88 mSv, respectively. CTA brain was 27.40 mGy, 1956 mGy-cm, and 4.11 mSv. CTA carotid was 17.71 mGy, 2150.50 mGy-cm, and 6.67 mSv, respectively. Conclusion: The study found that most of the CTDIvol were lower than standard international DRLs of other countries, but the DLP was higher in some CT protocols due to scan length. Furthermore the results of DRLs in this study should be practical tools to promote optimization and monitoring of patient radiation dose in Neurological Institute of Thailand.

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Published

27-09-2022

How to Cite

1.
Wonglao S. Evaluation of the Patient Radiation Doses from Computed Tomography (CT) in Neurological Institute of Thailand. J DMS [Internet]. 2022 Sep. 27 [cited 2024 Apr. 19];47(3):51-9. Available from: https://he02.tci-thaijo.org/index.php/JDMS/article/view/255788

Issue

Vol. 47 No. 3 (2022): July-September 2022

Section

Original Article

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Copyright (c) 2022 Department of Medical Services, Ministry of Public Health

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