CCD array for measuring spread functions

James Anthony Seibert; John M. Boone; Steven M. Burns

doi:10.1117/12.59486

1 May 1992 CCD array for measuring spread functions

James Anthony Seibert, John M. Boone, Steven M. Burns

Proceedings Volume 1653, Medical Imaging VI: Image Capture, Formatting, and Display; (1992) https://doi.org/10.1117/12.59486
Event: Medical Imaging VI, 1992, Newport Beach, CA, United States

Abstract

A prototype high resolution charge coupled photodiode device (CCD) array coupled to an analog to digital converter (ADC) personal computer system has been developed to assist in the measurement of line spread functions generated in diagnostic radiology for the purpose of objectively evaluating focal spots and film-screen systems. Presently, this task is accomplished with the use of a microdensitometer and associated hardware in order to achieve small enough sampling to make the measurements accurate. An ADC card in a personal computer system samples the output of the 2048 element CCD array, upon which a film containing the LSF is projected. Conversion of the transmitted light through the film by the CCD array permits digitization of the output video signal for subsequent analysis. The CCD computer system is relatively inexpensive and can be made portable, with the potential of providing in the field assessment of LSFs of similar accuracy to the microdensitometer. In addition, the direct computer interface allows for on-line data manipulation and corrections for the characteristic curve, background biases, and nonuniformities, as well as direct calculation of the corresponding MTFs through Fourier transformation.

Citation Download Citation

James Anthony Seibert, John M. Boone, and Steven M. Burns "CCD array for measuring spread functions", Proc. SPIE 1653, Medical Imaging VI: Image Capture, Formatting, and Display, (1 May 1992); https://doi.org/10.1117/12.59486

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