Performance analysis of medical x-ray film digitizers

Kwok Leung Yip; Anthony Richard Lubinsky; Bruce R. Whiting; Edward Muka; Thomas E. Kocher

doi:10.1117/12.18832

1 July 1990 Performance analysis of medical x-ray film digitizers

Kwok Leung Yip, Anthony Richard Lubinsky, Bruce R. Whiting, Edward Muka, Thomas E. Kocher

Proceedings Volume 1231, Medical Imaging IV: Image Formation; (1990) https://doi.org/10.1117/12.18832
Event: Medical Imaging '90, 1990, Newport Beach, CA, United States

Abstract

A system model for analyzing degradation in the image quality of a radiograph introduced by a film digitizer is presented. The analysis is an extension of the screen-film model of Shaw and VanMetter (SPIE 454, 128-141(1984)). By combining the screen-film characteristics for specific exam types with the properties (e.g., MTF and NPS) of a particular scanner design, the information transfer of the whole digital system can be determined. As an example, the performance of two typical film digitizers, a CCD-based scanner and a laser-based scanner, are evaluated and compared. Image quality descriptors, such as DQE and NEQ as well as equivalent bandwidth and system aperture, are used for the evaluation. By incorporating the human observer's threshold response to changes in noise levels (just noticeable differences), a criterion for negligible loss of image information can be established. This can be very useful for system optimization and determination of design tradeoffs.

Citation Download Citation

Kwok Leung Yip, Anthony Richard Lubinsky, Bruce R. Whiting, Edward Muka, and Thomas E. Kocher "Performance analysis of medical x-ray film digitizers", Proc. SPIE 1231, Medical Imaging IV: Image Formation, (1 July 1990); https://doi.org/10.1117/12.18832

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