CCD array for measuring spread functions

Research output: Chapter in Book/Report/Conference proceedingConference contribution


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 potentialof 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.

Original languageEnglish (US)
Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
Place of PublicationBellingham, WA, United States
PublisherPubl by Int Soc for Optical Engineering
Number of pages10
ISBN (Print)0819408050
StatePublished - 1992
EventMedical Imaging VI: Image Capture, Formatting, and Display - Newport Beach, CA, USA
Duration: Feb 23 1992Feb 24 1992


OtherMedical Imaging VI: Image Capture, Formatting, and Display
CityNewport Beach, CA, USA

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Condensed Matter Physics


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