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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Elsevier
2016
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| Online Access: | http://psasir.upm.edu.my/id/eprint/54214/ http://psasir.upm.edu.my/id/eprint/54214/1/Evaluation%20of%20organ%20doses%20and%20specific%20k%20effective%20dose%20of%2064-slice%20CT%20thorax%20.pdf |
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| author | Hashim, Suhairul Abdul Karim, Muhammad Khalis Bakar, K. A. Sabarudin, Akmal Chin, A. W. Saripan, M. Iqbal Bradley, David A. |
| author_facet | Hashim, Suhairul Abdul Karim, Muhammad Khalis Bakar, K. A. Sabarudin, Akmal Chin, A. W. Saripan, M. Iqbal Bradley, David A. |
| author_sort | Hashim, Suhairul |
| building | UPM Institutional Repository |
| collection | Online Access |
| description | 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. |
| first_indexed | 2025-11-15T10:38:48Z |
| format | Article |
| id | upm-54214 |
| institution | Universiti Putra Malaysia |
| institution_category | Local University |
| language | English |
| last_indexed | 2025-11-15T10:38:48Z |
| publishDate | 2016 |
| publisher | Elsevier |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | upm-542142018-03-07T00:29:37Z http://psasir.upm.edu.my/id/eprint/54214/ Evaluation of organ doses and specific k effective dose of 64-slice CT thorax examination using an adult anthropomorphic phantom Hashim, Suhairul Abdul Karim, Muhammad Khalis Bakar, K. A. Sabarudin, Akmal Chin, A. W. Saripan, M. Iqbal Bradley, David A. 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 2016-09 Article PeerReviewed text en http://psasir.upm.edu.my/id/eprint/54214/1/Evaluation%20of%20organ%20doses%20and%20specific%20k%20effective%20dose%20of%2064-slice%20CT%20thorax%20.pdf Hashim, Suhairul and Abdul Karim, Muhammad Khalis and Bakar, K. A. and Sabarudin, Akmal and Chin, A. W. and Saripan, M. Iqbal and Bradley, David 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; ESSN: 1879-0895 https://www.sciencedirect.com/science/article/pii/S0969806X16301451 Organ absorbed dose; Organ equivalent dose; CT thorax; Specific k coefficient; Optimization strategies 10.1016/j.radphyschem.2016.05.004 |
| spellingShingle | Organ absorbed dose; Organ equivalent dose; CT thorax; Specific k coefficient; Optimization strategies Hashim, Suhairul Abdul Karim, Muhammad Khalis Bakar, K. A. Sabarudin, Akmal Chin, A. W. Saripan, M. Iqbal Bradley, David A. Evaluation of organ doses and specific k effective dose of 64-slice CT thorax examination using an adult anthropomorphic phantom |
| title | 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_short | 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 |
| topic | Organ absorbed dose; Organ equivalent dose; CT thorax; Specific k coefficient; Optimization strategies |
| url | http://psasir.upm.edu.my/id/eprint/54214/ http://psasir.upm.edu.my/id/eprint/54214/ http://psasir.upm.edu.my/id/eprint/54214/ http://psasir.upm.edu.my/id/eprint/54214/1/Evaluation%20of%20organ%20doses%20and%20specific%20k%20effective%20dose%20of%2064-slice%20CT%20thorax%20.pdf |