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Edge contrast in ionography

D Plewes, H E Johns

Physics in Medicine and Biology

|November 1, 1978

Summary

This summary is machine-generated.

Mylar foil thickness impacts ionography image appearance. Varying foil thickness offers a simple method to adjust image edge contrast, as demonstrated with phantom images.

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Area of Science:

Medical Imaging
Physics

Background:

Ionography is an imaging technique.
Image quality in ionography can be influenced by various physical parameters.

Purpose of the Study:

To investigate the effect of Mylar foil thickness on ionography image appearance.
To explore Mylar foil thickness as a method for altering image contrast.

Main Methods:

Experimental measurements of charge depletion width for strips and halfplanes.
Microdensitometer traces of charged strips and halfplanes.
Analysis of the relationship between density and vertical electric field profile.
Imaging of a hand phantom using different Mylar foil thicknesses.

Main Results:

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Approximate expressions for depletion width were derived.

Image density was found to be proportional to the vertical electric field profile near the Mylar.

Different Mylar thicknesses demonstrably altered edge contrast in ionography images.

Conclusions:

Mylar foil thickness is a significant factor affecting ionography image appearance.
Adjusting Mylar foil thickness provides a straightforward method to control edge contrast in ionography.
This finding has practical implications for optimizing ionography image quality.