Evaluation of organ doses and specific k effective dose of 64-slice CT thorax examination using an adult anthropomorphic phantom
The magnitude of radiation dose in computed tomography (CT) depends on the scan acquisition parameters, investigated herein using an anthropomorphic phantom (RANDO®) and thermoluminescence dosimeters (TLD). Specific interest was in the organ doses resulting from CT thorax examination, the specific k...
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my.utm.721282017-11-23T01:37:08Z http://eprints.utm.my/id/eprint/72128/ Evaluation of organ doses and specific k effective dose of 64-slice CT thorax examination using an adult anthropomorphic phantom Hashim, S. Karim, M. K. A. Bakar, K. A. Sabarudin, A. Chin, A. W. Saripan, M. I. Bradley, D. A. QC Physics The magnitude of radiation dose in computed tomography (CT) depends on the scan acquisition parameters, investigated herein using an anthropomorphic phantom (RANDO®) and thermoluminescence dosimeters (TLD). Specific interest was in the organ doses resulting from CT thorax examination, the specific k coefficient for effective dose estimation for particular protocols also being determined. For measurement of doses representing five main organs (thyroid, lung, liver, esophagus and skin), TLD-100 (LiF:Mg, Ti) were inserted into selected holes in a phantom slab. Five CT thorax protocols were investigated, one routine (R1) and four that were modified protocols (R2 to R5). Organ doses were ranked from greatest to least, found to lie in the order: thyroid>skin>lung>liver>breast. The greatest dose, for thyroid at 25 mGy, was that in use of R1 while the lowest, at 8.8 mGy, was in breast tissue using R3. Effective dose (E) was estimated using three standard methods: the International Commission on Radiological Protection (ICRP)-103 recommendation (E103), the computational phantom CT-EXPO (E(CTEXPO)) method, and the dose-length product (DLP) based approach. E103 k factors were constant for all protocols, ~8% less than that of the universal k factor. Due to inconsistency in tube potential and pitch factor the k factors from CTEXPO were found to vary between 0.015 and 0.010 for protocols R3 and R5. With considerable variation between scan acquisition parameters and organ doses, optimization of practice is necessary in order to reduce patient organ dose. Elsevier Ltd 2016 Article PeerReviewed Hashim, S. and Karim, M. K. A. and Bakar, K. A. and Sabarudin, A. and Chin, A. W. and Saripan, M. I. and Bradley, D. A. (2016) Evaluation of organ doses and specific k effective dose of 64-slice CT thorax examination using an adult anthropomorphic phantom. Radiation Physics and Chemistry, 126 . pp. 14-20. ISSN 0969-806X https://www.scopus.com/inward/record.uri?eid=2-s2.0-84992268885&doi=10.1016%2fj.radphyschem.2016.05.004&partnerID=40&md5=b037411d7d05986231c5fd7545c55c80 |
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QC Physics Hashim, S. Karim, M. K. A. Bakar, K. A. Sabarudin, A. Chin, A. W. Saripan, M. I. Bradley, D. A. Evaluation of organ doses and specific k effective dose of 64-slice CT thorax examination using an adult anthropomorphic phantom |
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The magnitude of radiation dose in computed tomography (CT) depends on the scan acquisition parameters, investigated herein using an anthropomorphic phantom (RANDO®) and thermoluminescence dosimeters (TLD). Specific interest was in the organ doses resulting from CT thorax examination, the specific k coefficient for effective dose estimation for particular protocols also being determined. For measurement of doses representing five main organs (thyroid, lung, liver, esophagus and skin), TLD-100 (LiF:Mg, Ti) were inserted into selected holes in a phantom slab. Five CT thorax protocols were investigated, one routine (R1) and four that were modified protocols (R2 to R5). Organ doses were ranked from greatest to least, found to lie in the order: thyroid>skin>lung>liver>breast. The greatest dose, for thyroid at 25 mGy, was that in use of R1 while the lowest, at 8.8 mGy, was in breast tissue using R3. Effective dose (E) was estimated using three standard methods: the International Commission on Radiological Protection (ICRP)-103 recommendation (E103), the computational phantom CT-EXPO (E(CTEXPO)) method, and the dose-length product (DLP) based approach. E103 k factors were constant for all protocols, ~8% less than that of the universal k factor. Due to inconsistency in tube potential and pitch factor the k factors from CTEXPO were found to vary between 0.015 and 0.010 for protocols R3 and R5. With considerable variation between scan acquisition parameters and organ doses, optimization of practice is necessary in order to reduce patient organ dose. |
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Article |
author |
Hashim, S. Karim, M. K. A. Bakar, K. A. Sabarudin, A. Chin, A. W. Saripan, M. I. Bradley, D. A. |
author_facet |
Hashim, S. Karim, M. K. A. Bakar, K. A. Sabarudin, A. Chin, A. W. Saripan, M. I. Bradley, D. A. |
author_sort |
Hashim, S. |
title |
Evaluation of organ doses and specific k effective dose of 64-slice CT thorax examination using an adult anthropomorphic phantom |
title_short |
Evaluation of organ doses and specific k effective dose of 64-slice CT thorax examination using an adult anthropomorphic phantom |
title_full |
Evaluation of organ doses and specific k effective dose of 64-slice CT thorax examination using an adult anthropomorphic phantom |
title_fullStr |
Evaluation of organ doses and specific k effective dose of 64-slice CT thorax examination using an adult anthropomorphic phantom |
title_full_unstemmed |
Evaluation of organ doses and specific k effective dose of 64-slice CT thorax examination using an adult anthropomorphic phantom |
title_sort |
evaluation of organ doses and specific k effective dose of 64-slice ct thorax examination using an adult anthropomorphic phantom |
publisher |
Elsevier Ltd |
publishDate |
2016 |
url |
http://eprints.utm.my/id/eprint/72128/ https://www.scopus.com/inward/record.uri?eid=2-s2.0-84992268885&doi=10.1016%2fj.radphyschem.2016.05.004&partnerID=40&md5=b037411d7d05986231c5fd7545c55c80 |
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1643656362639491072 |
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13.18916 |