&lt;title&gt;Image quality characteristics of a novel film/screen system for mammography&lt;/title&gt;

Beutel, Jacob; Kitts, E. L.

doi:10.1117/12.237786

Cited by 5 publications

(2 citation statements)

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“…However, it may be approximated using experimental data. 58,59 The excess of this distribution function over a Poisson distribution has been expressed 58 by the Poisson excess noise ͑͒ given as follows:…”

Section: Light Productionmentioning

confidence: 99%

Modeling granular phosphor screens by Monte Carlo methods

et al. 2006

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The intrinsic phosphor properties are of significant importance for the performance of phosphor screens used in medical imaging systems. In previous analytical-theoretical and Monte Carlo studies on granular phosphor materials, values of optical properties, and light interaction cross sections were found by fitting to experimental data. These values were then employed for the assessment of phosphor screen imaging performance. However, it was found that, depending on the experimental technique and fitting methodology, the optical parameters of a specific phosphor material varied within a wide range of values, i.e., variations of light scattering with respect to light absorption coefficients were often observed for the same phosphor material. In this study, x-ray and light transport within granular phosphor materials was studied by developing a computational model using Monte Carlo methods. The model was based on the intrinsic physical characteristics of the phosphor. Input values required to feed the model can be easily obtained from tabulated data. The complex refractive index was introduced and microscopic probabilities for light interactions were produced, using Mie scattering theory. Model validation was carried out by comparing model results on x-ray and light parameters (x-ray absorption, statistical fluctuations in the x-ray to light conversion process, number of emitted light photons, output light spatial distribution) with previous published experimental data on Gd2O2S: Tb phosphor material (Kodak Min-R screen). Results showed the dependence of the modulation transfer function (MTF) on phosphor grain size and material packing density. It was predicted that granular Gd2O2S: Tb screens of high packing density and small grain size may exhibit considerably better resolution and light emission properties than the conventional Gd2O2S: Tb screens, under similar conditions (x-ray incident energy, screen thickness).

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Section: Light Productionmentioning

confidence: 99%

Modeling granular phosphor screens by Monte Carlo methods

et al. 2006

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“…It has been previously shown that the statistical fluctuations of the x-ray to light conversion process follow a probability distribution, which has not been expressedanalytically. However, it may be approximated using experimental data(Beutel et al 1993, Beutel andKittis 1996). The excess of this distribution function over a Poisson distribution has been expressed(Beutel et al 1993, Beutel andKittis 1996) by the Poisson excess noise ( ε ) given as follows:…”

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confidence: 99%