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 journalArticle

5 Citations (Scopus)

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 languageEnglish (US)
Pages (from-to)729-732
Number of pages4
JournalRadiation Measurements
Volume45
Issue number3-6
DOIs
StatePublished - Mar 1 2010

Fingerprint

Aluminum sheet
Mammography
Dosimeters
Quality assurance
Dosimetry
dosimeters
Ionization chambers
assurance
Radiation
Electric potential
aluminum
Air
Taiwan
ionization chambers
holders
chips
tubes
filters
dosage
energy

Keywords

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

ASJC Scopus subject areas

  • Radiation
  • Instrumentation

Cite this

Half-value layer determination using thermoluminescent dosimeters for digital mammography. / Tung, C. J.; Lin, M. T.; Hsu, F. Y.; Lee, J. H.; Chu, C. H.; Tsai, H. Y.

In: Radiation Measurements, Vol. 45, No. 3-6, 01.03.2010, p. 729-732.

Research output: Contribution to journalArticle

Tung, C. J. ; Lin, M. T. ; Hsu, F. Y. ; Lee, J. H. ; Chu, C. H. ; Tsai, H. Y. / Half-value layer determination using thermoluminescent dosimeters for digital mammography. In: Radiation Measurements. 2010 ; Vol. 45, No. 3-6. pp. 729-732.
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