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Proceedings Paper

The D-Log E Curve And Its Relationship To Lesion Contrast And Required Photon Count Densities For Medical Images
Author(s): Frank R. Whitehead
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Paper Abstract

Perception of a lesion in a Radiograph or Nuclear Medicine image requires that lesion contrast exceed both a threshold contrast value for the human visual system, and the contrast of any random fluctuations due to quantum mottle in the image. In principle, any lesion contrast value can be raised above visual threshold by choosing a film with sufficiently high gamma, and the quantum mottle reduced to any desired minimum by using a high enough photon count density in the image. In practice, one must compromise these parameters within the constraints of limited dynamic range for the film and the need to minimize discomfort and radiation dose to the patient. This talk will show how quantitative relationships can be developed to calculate the minimum detectable lesion contrast value and maximum useable photon count density for any film. In the development of diagnostic imaging procedures, these relationships offer considerable assistance in optimizing the choice of film with regard to the characteristics of the human visual system and the limitations of present-day instrumentation.

Paper Details

Date Published: 27 December 1977
PDF: 5 pages
Proc. SPIE 0127, Application of Optical Instrumentation in Medicine VI, (27 December 1977); doi: 10.1117/12.955920
Show Author Affiliations
Frank R. Whitehead, Searle Diagnostics Inc. (United States)

Published in SPIE Proceedings Vol. 0127:
Application of Optical Instrumentation in Medicine VI
Joel E. Gray; William R. Hendee, Editor(s)

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