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.

References

Vañó E, Miller DL, Martin CJ, Rehani MM, Kang K, Rosenstein M, et al. Diagnostic Reference Levels in Medical Imaging. C.H CLEMENT, editor. Ann ICRP. 2017; 46:1-144.

Diagnostic Reference Levels (DRLs) in medical imaging. IAEA. [Internet].2018. [cited 2018 Mar 21]. Available from: URL; http//www.iaea.org/rpop/diagn/eid.htm.

Radiation and your Patient: A guide for medical practitioners – ICRP. [Internet]. [Cited 2013]. Available from: URL; http//www.icrp.org/docs/Rad_for_GP_for_web.pdf.

Department of Medical Sciences. Ministry of Public Health. Diagnostic reference levels in Computed Tomography. [Internet].2019. [Cited 2019 Mar 14]. Available from: URL; http//www.dmsc.moph.go.th/eid.htm.

MDCT DRLs in more detail. [Internet]. [Cited 2017]. Available from: URL; http//www.arpansa.gov.au/eid.htm.

Shrimpton PC, Hillier MC, Lewis MA, Dunn M. National survey of doses from CT in the UK: 2003. Br J Radiol. 2006; 79: 968-980.

Vassileva. Diagnostic Reference Levels (DRLs): The concept and use. SlideShare. [Internet].2019. [Cited 2016 Oct 17]. Available from: URL; http//www.Slideshare.net/medinao/eid.htm.

S.-W. Yoon, J. Kim, S.-K. Lee. Second Korean National CT Diagnostic reference levels in 14 CT Protocols. ESR: ECR 2018; C-2497.

Treier R, Aroua A, Verdun FR, Samara E, Stuessi A, Trueb PR. Patient doses in CT examinations in Switzerland: implementation of national diagnostic reference levels. Radiat Prot Dosimetry. 2010; 142: 244-54.

Schegerer A, Loose R, Heuser LJ, Brix G. Diagnostic Reference Levels for Diagnostic and Interventional X-Ray Procedures in Germany: Update and Handling. Rofo. 2019; 191: 739-751.

Lee KL, Beveridge T, Sanagou M, Thomas P. Updated Australian diagnostic reference levels for adult CT. J Med Radiat Sci. 2020; 67 :5-15.

van der Molen AJ, Schilham A, Stoop P, Prokop M, Geleijns J. A national survey on radiation dose in CT in The Netherlands. Insights Imaging. 2013; 4: 383-90.

Public Health England. National Diagnostic Reference Levels (NDRLs) from 19 August 2019. National DRLs for Computed Tomography (CT). [Internet]. 2019. [Cited 2019 Aug 19]. Available from: URL; http//www.gov.uk.

Kanal KM, Butler PF, Sengupta D, Bhargavan-Chatfield M, Coombs LP, Morin RL. U.S. Diagnostic Reference Levels and Achievable Doses for 10 Adult CT Examinations. Radiology. 2017; 284:120-133.

European Commission. Radiation 2014. Diagnostic Reference Levels in Thirty-six European Countries. [Internet]. 2014. Available from: URL; http//www.europa.eu.

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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 Dec. 21];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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