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Journal of the Optical Society of America A

Journal of the Optical Society of America A

| OPTICS, IMAGE SCIENCE, AND VISION

  • Vol. 22, Iss. 1 — Jan. 1, 2005
  • pp: 148–167

Task-based lens design with application to digital mammography

Liying Chen and Harrison H. Barrett  »View Author Affiliations


JOSA A, Vol. 22, Issue 1, pp. 148-167 (2005)
http://dx.doi.org/10.1364/JOSAA.22.000148


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Abstract

Recent advances in model observers that predict human perceptual performance now make it possible to optimize medical imaging systems for human task performance. We illustrate the procedure by considering the design of a lens for use in an optically coupled digital mammography system. The channelized Hotelling observer is used to model human performance, and the channels chosen are differences of Gaussians. The task performed by the model observer is detection of a lesion at a random but known location in a clustered lumpy background mimicking breast tissue. The entire system is simulated with a Monte Carlo application according to physics principles, and the main system component under study is the imaging lens that couples a fluorescent screen to a CCD detector. The signal-to-noise ratio (SNR) of the channelized Hotelling observer is used to quantify this detectability of the simulated lesion (signal) on the simulated mammographic background. Plots of channelized Hotelling SNR versus signal location for various lens apertures, various working distances, and various focusing places are presented. These plots thus illustrate the trade-off between coupling efficiency and blur in a task-based manner. In this way, the channelized Hotelling SNR is used as a merit function for lens design.

© 2005 Optical Society of America

OCIS Codes
(110.3000) Imaging systems : Image quality assessment
(170.0110) Medical optics and biotechnology : Imaging systems
(170.3880) Medical optics and biotechnology : Medical and biological imaging
(220.3620) Optical design and fabrication : Lens system design
(220.4830) Optical design and fabrication : Systems design

History
Original Manuscript: March 22, 2004
Revised Manuscript: July 7, 2004
Published: January 1, 2005

Citation
Liying Chen and Harrison H. Barrett, "Task-based lens design with application to digital mammography," J. Opt. Soc. Am. A 22, 148-167 (2005)
http://www.opticsinfobase.org/josaa/abstract.cfm?URI=josaa-22-1-148


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