The Finite-Length Line-Spread Function: An Extension To Asymmetric Point Spread Functions

W. J. Dallas

doi:10.1117/12.968632

27 June 1988 The Finite-Length Line-Spread Function: An Extension To Asymmetric Point Spread Functions

W. J. Dallas

Proceedings Volume 0914, Medical Imaging II; (1988) https://doi.org/10.1117/12.968632
Event: Medical Imaging II, 1988, Newport Beach, CA, United States

Abstract

The point spread function (PSF) is used to characterize imaging systems. The PSF is usually not measured directly but rather the line spread function (LSF) is measured by scanning across the image of an input slit. One of the well known LSF-PSF conversion formulas is then applied.1 These formulas make the assumption that the length of the input-slit image is great compared to the PSF extent. This assumption is unfortunately unwarranted for one of the most important medical imaging devices: the x-ray image intensifier. The large extent image intensifier's PSF and the limited size of the intensifier's isoplanatic patches combine to make consideration of the finite length of the input slit important. For-mulas for calculating the PSF from a measurement of the finite-length line spread function (FLSF) have been developed for the case of a rotationally symmetric PSF.3 In this presentation we generalize the conversion formulas to cover non-symmetric PSF's.

Citation Download Citation

W. J. Dallas "The Finite-Length Line-Spread Function: An Extension To Asymmetric Point Spread Functions", Proc. SPIE 0914, Medical Imaging II, (27 June 1988); https://doi.org/10.1117/12.968632

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