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Investigation of Eye Lens Dose Estimate based on AAPM Report 293 in Head Computed Tomography

BACKGROUND: Estimation of eye lens dose is important in head computed tomography (CT) examination since the eye lens is a sensitive organ to ionizing radiation. OBJECTIVE: The purpose of this study is to compare estimations of eye lens dose in head CT examinations using local size-specific dose esti...

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Autores principales: Anam, Choirul, Kusuma Dewi, Winda, Masdi, Masdi, Haryanto, Freddy, Fujibuchi, Toshioh, Dougherty, Geoff
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Shiraz University of Medical Sciences 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8546161/
https://www.ncbi.nlm.nih.gov/pubmed/34722401
http://dx.doi.org/10.31661/jbpe.v0i0.2104-1304
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author Anam, Choirul
Kusuma Dewi, Winda
Masdi, Masdi
Haryanto, Freddy
Fujibuchi, Toshioh
Dougherty, Geoff
author_facet Anam, Choirul
Kusuma Dewi, Winda
Masdi, Masdi
Haryanto, Freddy
Fujibuchi, Toshioh
Dougherty, Geoff
author_sort Anam, Choirul
collection PubMed
description BACKGROUND: Estimation of eye lens dose is important in head computed tomography (CT) examination since the eye lens is a sensitive organ to ionizing radiation. OBJECTIVE: The purpose of this study is to compare estimations of eye lens dose in head CT examinations using local size-specific dose estimate (SSDE) based on size-conversion factors of the American Association of Physicists in Medicine (AAPM) Report No. 293 with those based on size-conversion factors of the AAPM Report No. 220. MATERIAL AND METHODS: This experimental study is conducted on a group of patients who had undergone nasopharyngeal CT examination. Due to the longitudinal (z-axis) dose fluctuation, the average global SSDE and average local SSDE (i.e. particular slices where the eyes are located) were investigated. All estimates were compared to the measurement results using thermo-luminescent dosimeters (TLDs). The estimated and measured doses were implemented for 14 patients undergoing nasopharyngeal CT examination. RESULTS: It was found that the percentage differences of the volume CT dose index (CTDI(vol)), average global SSDE based on AAPM No. 220 (SSDE(o,g)), average local SSDE based on AAPM No. 220 (SSDE(o,l)), average global SSDE based on AAPM No. 293 (SSDE(n,g)) and average local SSDE based on AAPM No. 293 (SSDE(n,l)) against the measured TLD doses were 22.5, 21.7, 15.0, 9.3, and 2.1%, respectively. All comparisons between dose estimates and TLD measurements gave p-values less than 0.001, except for SSDE(n,l) (p-value = 0.566). CONCLUSION: SSDE based on AAPM Report No. 293 can be used to accurately estimate eye lens radiation doses by performing the calculations on a number of specific slices containing the eyes.
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spelling pubmed-85461612021-10-29 Investigation of Eye Lens Dose Estimate based on AAPM Report 293 in Head Computed Tomography Anam, Choirul Kusuma Dewi, Winda Masdi, Masdi Haryanto, Freddy Fujibuchi, Toshioh Dougherty, Geoff J Biomed Phys Eng Original Article BACKGROUND: Estimation of eye lens dose is important in head computed tomography (CT) examination since the eye lens is a sensitive organ to ionizing radiation. OBJECTIVE: The purpose of this study is to compare estimations of eye lens dose in head CT examinations using local size-specific dose estimate (SSDE) based on size-conversion factors of the American Association of Physicists in Medicine (AAPM) Report No. 293 with those based on size-conversion factors of the AAPM Report No. 220. MATERIAL AND METHODS: This experimental study is conducted on a group of patients who had undergone nasopharyngeal CT examination. Due to the longitudinal (z-axis) dose fluctuation, the average global SSDE and average local SSDE (i.e. particular slices where the eyes are located) were investigated. All estimates were compared to the measurement results using thermo-luminescent dosimeters (TLDs). The estimated and measured doses were implemented for 14 patients undergoing nasopharyngeal CT examination. RESULTS: It was found that the percentage differences of the volume CT dose index (CTDI(vol)), average global SSDE based on AAPM No. 220 (SSDE(o,g)), average local SSDE based on AAPM No. 220 (SSDE(o,l)), average global SSDE based on AAPM No. 293 (SSDE(n,g)) and average local SSDE based on AAPM No. 293 (SSDE(n,l)) against the measured TLD doses were 22.5, 21.7, 15.0, 9.3, and 2.1%, respectively. All comparisons between dose estimates and TLD measurements gave p-values less than 0.001, except for SSDE(n,l) (p-value = 0.566). CONCLUSION: SSDE based on AAPM Report No. 293 can be used to accurately estimate eye lens radiation doses by performing the calculations on a number of specific slices containing the eyes. Shiraz University of Medical Sciences 2021-10-01 /pmc/articles/PMC8546161/ /pubmed/34722401 http://dx.doi.org/10.31661/jbpe.v0i0.2104-1304 Text en Copyright: © Journal of Biomedical Physics and Engineering https://creativecommons.org/licenses/by-nc/4.0/This is an Open Access article distributed under the terms of the Creative Commons Attribution-NonCommercial 4.0 Unported License, ( http://creativecommons.org/licenses/by-nc/4.0/ (https://creativecommons.org/licenses/by-nc/4.0/) ) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
spellingShingle Original Article
Anam, Choirul
Kusuma Dewi, Winda
Masdi, Masdi
Haryanto, Freddy
Fujibuchi, Toshioh
Dougherty, Geoff
Investigation of Eye Lens Dose Estimate based on AAPM Report 293 in Head Computed Tomography
title Investigation of Eye Lens Dose Estimate based on AAPM Report 293 in Head Computed Tomography
title_full Investigation of Eye Lens Dose Estimate based on AAPM Report 293 in Head Computed Tomography
title_fullStr Investigation of Eye Lens Dose Estimate based on AAPM Report 293 in Head Computed Tomography
title_full_unstemmed Investigation of Eye Lens Dose Estimate based on AAPM Report 293 in Head Computed Tomography
title_short Investigation of Eye Lens Dose Estimate based on AAPM Report 293 in Head Computed Tomography
title_sort investigation of eye lens dose estimate based on aapm report 293 in head computed tomography
topic Original Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8546161/
https://www.ncbi.nlm.nih.gov/pubmed/34722401
http://dx.doi.org/10.31661/jbpe.v0i0.2104-1304
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