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Related Experiment Videos

Low-cost microcomputer-based densitometer.

H K Richards, A H Lovick, J D Pickard

    Journal of Cerebral Blood Flow and Metabolism : Official Journal of the International Society of Cerebral Blood Flow and Metabolism
    |September 1, 1985
    PubMed
    Summary
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    We developed affordable equipment using a video system and microcomputer to measure x-ray film optical density. This system provides a stable, linear response for accurate density readings up to 0.8.

    Area of Science:

    • Medical Imaging
    • Optical Physics
    • Computer Engineering

    Background:

    • Accurate optical density measurement is crucial for interpreting medical x-ray films.
    • Existing equipment for optical density measurement can be expensive and inaccessible.

    Purpose of the Study:

    • To develop and validate a low-cost system for measuring the optical density of x-ray films.
    • To enable accessible and reliable optical density analysis in various settings.

    Main Methods:

    • Construction of custom low-cost equipment integrating a video system and an analog-to-digital converter.
    • Connection to an Apple microcomputer for data acquisition and processing.
    • Utilizing BASIC or machine-code programs for optical density retrieval.

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    Main Results:

    • The developed system successfully measures optical density of x-ray films.
    • A stable, linear response was observed for optical densities up to 0.8.
    • Calibration using a step-wedge film confirmed system accuracy.

    Conclusions:

    • The low-cost video-based system offers a viable alternative for x-ray film optical density measurement.
    • This approach democratizes access to essential diagnostic tools.
    • Further applications in quality control and research are feasible.