Half-value layer determination using thermoluminescent dosimeters for digital mammography

C. J. Tung; M. T. Lin; F. Y. Hsu; J. H. Lee; C. H. Chu; H. Y. Tsai

doi:10.1016/j.radmeas.2010.02.015

Half-value layer determination using thermoluminescent dosimeters for digital mammography

C. J. Tung, M. T. Lin, F. Y. Hsu, J. H. Lee, C. H. Chu, H. Y. Tsai

Research output: Contribution to journal › Article › peer-review

6 Scopus citations

Abstract

The quality assurance of digital mammogram has been included in the Standards of Medical Exposure Quality Assurance in Taiwan since July, 2008. According to the Standards, determination of the half-value layer (HVL) is an integral part of mammographic dosimetry which requires the evaluation of patient's glandular dose. The purpose of this study was to develop a simple method to help hospitals determine the HVL. A compact device, accommodating Harshaw TLD-100H (LiF:Mg,Cu,P) chips and aluminum sheets in a small holder, was designed to determine the HVL under clinical exposure conditions (tube voltage, target/filter) of a digital mammographic unit. This device was used to determine the HVL ranging from 0.3- to 0.5-mm Al. Air KERMA measured by the TLDs were corrected for scatter radiation and energy dependence caused by the aluminum sheets. Once scatter and energy dependence were corrected, the agreement of determined HVLs was within ±7% with measured data using the ionization chamber. This device provides a simple, inexpensive and remote means to reliably audit the HVL of a mammography unit on a periodic basis.

Original language	English (US)
Pages (from-to)	729-732
Number of pages	4
Journal	Radiation Measurements
Volume	45
Issue number	3-6
DOIs	https://doi.org/10.1016/j.radmeas.2010.02.015
State	Published - Mar 2010

Keywords

Half-value layer (HVL)
Mammography
TLD-100H

ASJC Scopus subject areas

Radiation
Instrumentation

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10.1016/j.radmeas.2010.02.015

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title = "Half-value layer determination using thermoluminescent dosimeters for digital mammography",

abstract = "The quality assurance of digital mammogram has been included in the Standards of Medical Exposure Quality Assurance in Taiwan since July, 2008. According to the Standards, determination of the half-value layer (HVL) is an integral part of mammographic dosimetry which requires the evaluation of patient's glandular dose. The purpose of this study was to develop a simple method to help hospitals determine the HVL. A compact device, accommodating Harshaw TLD-100H (LiF:Mg,Cu,P) chips and aluminum sheets in a small holder, was designed to determine the HVL under clinical exposure conditions (tube voltage, target/filter) of a digital mammographic unit. This device was used to determine the HVL ranging from 0.3- to 0.5-mm Al. Air KERMA measured by the TLDs were corrected for scatter radiation and energy dependence caused by the aluminum sheets. Once scatter and energy dependence were corrected, the agreement of determined HVLs was within ±7% with measured data using the ionization chamber. This device provides a simple, inexpensive and remote means to reliably audit the HVL of a mammography unit on a periodic basis.",

keywords = "Half-value layer (HVL), Mammography, TLD-100H",

author = "Tung, {C. J.} and Lin, {M. T.} and Hsu, {F. Y.} and Lee, {J. H.} and Chu, {C. H.} and Tsai, {H. Y.}",

note = "Funding Information: This work was supported by grant No. 972001INER008 from the Atomic Energy Council of the Republic of China . The authors wish to thank Ming-Che Lee, supervisor of Department of Radiology of Chang Hua Christian Hospital, for the permission to use the mammographic X-ray unit. Copyright: Copyright 2011 Elsevier B.V., All rights reserved.",

year = "2010",

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doi = "10.1016/j.radmeas.2010.02.015",

language = "English (US)",

volume = "45",

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AU - Lin, M. T.

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AU - Lee, J. H.

AU - Chu, C. H.

AU - Tsai, H. Y.

N1 - Funding Information: This work was supported by grant No. 972001INER008 from the Atomic Energy Council of the Republic of China . The authors wish to thank Ming-Che Lee, supervisor of Department of Radiology of Chang Hua Christian Hospital, for the permission to use the mammographic X-ray unit. Copyright: Copyright 2011 Elsevier B.V., All rights reserved.

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N2 - The quality assurance of digital mammogram has been included in the Standards of Medical Exposure Quality Assurance in Taiwan since July, 2008. According to the Standards, determination of the half-value layer (HVL) is an integral part of mammographic dosimetry which requires the evaluation of patient's glandular dose. The purpose of this study was to develop a simple method to help hospitals determine the HVL. A compact device, accommodating Harshaw TLD-100H (LiF:Mg,Cu,P) chips and aluminum sheets in a small holder, was designed to determine the HVL under clinical exposure conditions (tube voltage, target/filter) of a digital mammographic unit. This device was used to determine the HVL ranging from 0.3- to 0.5-mm Al. Air KERMA measured by the TLDs were corrected for scatter radiation and energy dependence caused by the aluminum sheets. Once scatter and energy dependence were corrected, the agreement of determined HVLs was within ±7% with measured data using the ionization chamber. This device provides a simple, inexpensive and remote means to reliably audit the HVL of a mammography unit on a periodic basis.

AB - The quality assurance of digital mammogram has been included in the Standards of Medical Exposure Quality Assurance in Taiwan since July, 2008. According to the Standards, determination of the half-value layer (HVL) is an integral part of mammographic dosimetry which requires the evaluation of patient's glandular dose. The purpose of this study was to develop a simple method to help hospitals determine the HVL. A compact device, accommodating Harshaw TLD-100H (LiF:Mg,Cu,P) chips and aluminum sheets in a small holder, was designed to determine the HVL under clinical exposure conditions (tube voltage, target/filter) of a digital mammographic unit. This device was used to determine the HVL ranging from 0.3- to 0.5-mm Al. Air KERMA measured by the TLDs were corrected for scatter radiation and energy dependence caused by the aluminum sheets. Once scatter and energy dependence were corrected, the agreement of determined HVLs was within ±7% with measured data using the ionization chamber. This device provides a simple, inexpensive and remote means to reliably audit the HVL of a mammography unit on a periodic basis.

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Half-value layer determination using thermoluminescent dosimeters for digital mammography

Abstract

Keywords

ASJC Scopus subject areas

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