Models of the Point Spread Function of Photographic Emulsions Based on a Simplified Diffusion Calculation*

Gilmore, H. F.

doi:10.1364/josa.57.000075

Cited by 13 publications

(4 citation statements)

References 11 publications

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“…This finding is perhaps empirical evidence that the theory used to generate the PSF of Eq. (1), which originally stemmed from a model of light scatter in a thin film 16 and was later adapted to apply to light scatter in an image intensifier, 17 may not be ideal for low-energy x rays [24-36 kV]. Although this biexponential has not been noted before in mammography, it is of interest that recent work by Dixon and Boone has found that scatter in CT can be described by a biexponential line-spread function.…”

Section: B Mrementioning

confidence: 99%

Characterization of scatter in digital mammography from use of Monte Carlo simulations and comparison to physical measurements

Leon¹,

Brateman

Wagner³

2014

Medical Physics

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The findings show agreement between the physical measurements published previously and the Monte Carlo simulations presented here; the resulting data can therefore be used more confidently for an application such as image processing-based scatter correction. The findings also suggest that breast composition does not have a major impact on the scatter characteristics of breast tissue. Application of the scatter data to the development of a scatter-correction software program can be simplified by ignoring the variations in density among breast tissues.

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Section: B Mrementioning

confidence: 99%

Characterization of scatter in digital mammography from use of Monte Carlo simulations and comparison to physical measurements

Leon¹,

Brateman

Wagner³

2014

Medical Physics

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“…The theoretical basis of the method for measuring veiling glare is an energy diffusion model which describes the veiling glare point spread function (Gilmore 1967, Siebert et al 1984. The model is based on the assumption that the output phosphor of the image intensifier is the main source of light scattering within the imaging system.…”

Section: Veiling Glarementioning

confidence: 99%

An approach to iodine quantitation using digital fluorography

Kotre¹,

Harrison²,

Faulkner³

et al. 1989

Phys. Med. Biol.

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A technique is suggested for quantitative estimation of contrast medium in human organs using digital subtraction fluorography.A reference wedge of tin is placed in the x-ray field for one of two mask images. The subtracted sequence then contains a set of reference pixel values which can be used as calibration data for the administered contrast medium.The factors affecting quantitative measurement are discussed and experimental estimates of errors made. The characteristics of veiling glare in the system were measured and the effectiveness of a deconvolution algorithm demonstrated.Pixel values corresponding to various thicknesses of a tin reference wedge were compared with those corresponding to thicknesses of tin in a test wedge positioned within a phantom to simulate the patient. Differences between pixel values were measured for variations in several radiographic parameters. Frame-to-frame changes in x-ray output were minimised by using the modal pixel value in the image as a background reference.An estimation of mass thickness of known iodine solutions was made using the technique. In the range 0.5-20.0 mg cm" iodine, the mean estimated value was 0.8 mg cm-2 lower than nominal, with an uncertainty of 1.1 mgcm".

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“…the modulation transfer function and the Wiener spectrum. Models of spread functions and MTF are due to Eyer (1958), Jones (1958c), Paris (1961), Frieser (1960), Haase and Muller (1960), Gilmore (1967) and Johnson (1970,1972). Models relative specifically to the factors governing adjacency effects are due to Simonds (1965), Nelson (1971), Barrows and Wolfe (1971), Kriss et aZ (1974), Ehn and Silevitch (1974) and Silevitch et aZ(l977).…”

Section: Spatial Frequency Characteristicsmentioning

confidence: 99%

Evaluating the efficient of imaging processes

Shaw

1978

Rep. Prog. Phys.

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This review describes the techniques which are used to evaluate the properties of the recorded image. These techniques are described from the viewpoints of Fourier analysis, quantum efficiency, and information theory. An analysis is made of the mechanisms of conventional silver halide processes which control their imaging efficiency and image quality. Some examples of the methods of image evaluation are given for practical problems involving x-ray images, electronographic cameras and image intensifiers in astronomy, and for the electrophotographic process.

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Models of the Point Spread Function of Photographic Emulsions Based on a Simplified Diffusion Calculation*

Cited by 13 publications

References 11 publications

Characterization of scatter in digital mammography from use of Monte Carlo simulations and comparison to physical measurements

Characterization of scatter in digital mammography from use of Monte Carlo simulations and comparison to physical measurements

An approach to iodine quantitation using digital fluorography

Evaluating the efficient of imaging processes

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