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Regional renal function measured by videodensitometry

U Erikson, L E Lörelius, G Ruhn

    Scandinavian Journal of Urology and Nephrology
    |January 1, 1981
    PubMed
    Summary
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    This study shows videodensitometry can measure kidney blood flow and filtration fraction. This method provides functional insights alongside anatomical information from angiography.

    Area of Science:

    • Nephrology
    • Radiology
    • Medical Imaging

    Background:

    • Accurate assessment of renal hemodynamics is crucial for diagnosing and managing kidney diseases.
    • Conventional angiography provides anatomical detail but limited functional information.
    • Developing non-invasive methods to evaluate renal blood flow and filtration is an ongoing area of research.

    Purpose of the Study:

    • To evaluate the videodensitometric method for determining regional renal blood flow and filtration fraction.
    • To compare videodensitometry with conventional clearance techniques for functional assessment.
    • To explore the utility of videodensitometry in providing functional kidney insights.

    Main Methods:

    • Videodensitometry was employed using two contrast agents: Thorotrast (intravascular) and Angiografin (intravascular, interstitial, and freely filtrable).

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  • Contrast density was monitored via TV-screen light intensity, with regions of interest selected using a light pen.
  • Passage times and plateau fractions were analyzed from videodensitometric curves and compared with 125I-labelled Angiografin and conventional clearance techniques.

    • Main Results:

    • Videodensitometry yielded regional renal blood flow values comparable to those obtained with both contrast agents.
    • The filtration fraction determined by videodensitometry showed similar values to those from conventional clearance techniques.
    • The method demonstrated distinct curve patterns for intravascular (Thorotrast) and freely filtrable (Angiografin) agents, allowing for functional parameter calculation.

    Conclusions:

    • Videodensitometry is a viable method for assessing regional renal blood flow and filtration fraction.
    • This technique offers valuable functional information of the kidney, complementing anatomical data from conventional angiography.
    • The videodensitometric approach enhances the diagnostic capabilities in renal imaging.