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Half-value layer measurement: simple process method using radiochromic film.

T Gotanda1, T Katsuda, R Gotanda

  • 1Okayama University, Graduate School of Health Sciences, Okayama, Japan. tat151826@yahoo.co.jp

Australasian Physical & Engineering Sciences in Medicine
|October 31, 2009
PubMed
Summary
This summary is machine-generated.

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A new simple process method using radiochromic film (GAF-R) allows for quick half-value layer (HVL) measurements. This method offers a viable alternative to traditional ionization chamber (IC) measurements for quality assurance (QA) and quality control (QC).

Area of Science:

  • Medical Physics
  • Radiological Imaging
  • Quality Assurance

Background:

  • The half-value layer (HVL) is crucial for radiological quality assurance (QA) and quality control (QC).
  • Traditional HVL measurements using ionization chambers (IC) are complex and time-consuming, hindering routine monitoring.

Purpose of the Study:

  • To develop and evaluate a simplified method for measuring the half-value layer (HVL).
  • To assess the feasibility of using radiochromic film (GAFCHROMIC XR TYPE R: GAF-R) for routine HVL measurements.

Main Methods:

  • A novel 'simple process method' utilizing GAF-R film with step-shaped aluminum (Al) filters was developed.
  • HVL measurements were performed at X-ray tube voltages of 120 kV, 100 kV, and 80 kV.
  • HVL was calculated using the density attenuation ratio from the GAF-R film, and results were compared against an IC dosimeter.

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Main Results:

  • HVL values obtained with GAF-R at 120 kV, 100 kV, and 80 kV were 4.10 mm, 3.55 mm, and 2.97 mm, respectively.
  • Comparison with IC measurements showed difference ratios of 1.2% (120 kV), 7.6% (100 kV), and 10.0% (80 kV).
  • The simple process method demonstrated high accuracy at 120 kV, with potential for routine use.

Conclusions:

  • The GAF-R based simple process method enables rapid and routine HVL measurements, particularly at 120 kV, potentially replacing the need for IC dosimeters in QA/QC.
  • While effective for higher energies, careful consideration is advised for HVL measurements at lower energies (100 kV and 80 kV) using this method.