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Radiation Dose of Head and Abdomen-Pelvis Computed Tomography Examinations Using Size-Specific Dose Estimate Publisher



Ahmadifard M1 ; Bakhshandeh M2 ; Mohammadbeigi A3, 4 ; Khoshgard K5
Authors
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Authors Affiliations
  1. 1. Radiobiology and Radiation Protection Dept., School of Allied Medical Sciences, Shahid Beheshti University of Medical Sciences, Tehran, Iran
  2. 2. Department of Radiology Technology, Allied Medical Faculty, Shahid Beheshti University of Medical Sciences, Tehran, Iran
  3. 3. Students Research Committee, Kermanshah University of Medical Sciences, Kermanshah, Iran
  4. 4. Department of Radiology, Sina Hospital, Tehran University of Medical Sciences, Tehran, Iran
  5. 5. Department of Medical Physics, School of Medicine, Kermanshah University of Medical Sciences, Kermanshah, Iran

Source: International Journal of Radiation Research Published:2022


Abstract

Background: Concern about radiation risk of computed tomography (CT) scan as a diagnostic modality has increased in recent years. Diagnostic reference levels (DRLs) is one of the tools to optimizing radiation dose of patients. CTDIv (Volume Computed tomography dose index) and DLP (Dose Length product) are used for assessment of DRLs. The CTDIv under/overestimate the patient dose. AAPM has introduced SSDE (Size-specific dose estimates) for estimation of patient. In this study, the DRLs of head and abdomen-pelvis CT examinations of adults is determined using CTDIv, DLP and SSDE. Materials and Methods: 680 CT examinations of head and abdomen-pelvis were collected from PACS (Picture archiving and communication system) in Imam Khomeini and Mostafa Khomeini hospitals. The Deff, CF and SSDE calculated using AAPM TG-204 and TG-220. Statistics analysis calculated using SPSS version 18. Results: For abdomen-pelvis third quartile of CTDIV, SSDE and DLP was 9.96, 13.58 and 527 and values of 27.62, 26.79 and 402.90 are determined for head, respectively that are lower than national DRLs. Also, calculated conversion factor (CF) for head and abdomen-pelvis was 0.97 ± 0.75and 1.45 ± 0.17, respectively. Conclusion: DRLs were lower than other studies in this study. Using the AEC (Auto Exposure Control) and different kVp in this hospitals can help optimization of patient dose. The SSDE must be calculable by radiographers to more accurate estimation of patient dose using CFs. © 2022 Novin Medical Radiation Institute. All rights reserved.
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