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

Half-value layer measurement: simple process method using radiochromic film
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Determination of Half-Value Layer

Radiology, 1959
In the determination of half-value layer, the geometry involved is usually described as “good” geometry or “poor” geometry. In general, these terms have reference to measurements made under narrow-beam and broad-beam conditions. Such conditions have not been too well explored.
E D, TROUT, J P, KELLEY, A C, LUCAS
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Uncertainties in half value layer determination in mammography

AIP Conference Proceedings, 2016
A critical analysis of the methodologies for evaluating the x-ray half value layer was conducted. Experimental data were fitted by using MATLAB curve fitting toolbox, to an exponential function. Half value layer and its uncertainties were determined directly from the parameter of the fitted function.
S. Mijović, S. Ivanović, F. Bemelmans, H. Bosmans   +3 more
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On the measurement of half‐value layer in film–screen mammography

Medical Physics, 1990
Sources of variations in the measurement of half‐value layer (HVL) in film–screen mammography are evaluated. Two principal sources are the energy responses of ionization chambers and the elemental compositions of the 1100 aluminum‐alloy attenuation materials.
L K, Wagner, B R, Archer, F, Cerra
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Half-value layer determination using thermoluminescent dosimeters for digital mammography

Radiation Measurements, 2010
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.
C.J. Tung, M.T. Lin, F.Y. Hsu, J.H. Lee, C.H. Chu, H.Y. Tsai   +5 more
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Rapid Determination of the Half-Value Layer of Radiographic X-Ray Machines

Radiology, 1973
Many governmental agencies require verification of the collimator alignment and the half-value layer (HVL). The authors propose a method by which the widely used film technique may be extended to measurement of the HVL. The method is validated and its accuracy verified by measurements of 25 radiographic units.
L, Stanton, J L, Day, R E, Stanton, D A, Lightfoot   +3 more
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A Note on the Determination of Half-value Layers of Soft X rays

The British Journal of Radiology, 1952
A method is described of deriving a reliable half-value layer of X radiation from measurements made with a dose-meter whose readings require to be corrected for quality. The magnitude of the corrections to the observed half-value layer is considered and the effect this has on the dosemeter quality factor is discussed.
M T, MORRISON, G W, REED
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A simple method for evaluation of half-value layer variation in CT equipment

Physics in Medicine and Biology, 2006
Tandem systems, each formed by a pencil ionization chamber with and without a specific covering, were developed and tested in standard radiation beams. These systems were designed to be used in computed tomography radiation beams, where the half-value layer (HVL) determination is not an easy task.
Ana F, Maia, Linda V E, Caldas
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