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Related Experiment Videos

Noninvasive x-ray tube current measurement.

J V Atherton, E L Nickoloff

    Medical Physics
    |March 1, 1987
    PubMed
    Summary

    A Hall effect current probe accurately measures x-ray tube current, identifying miscalibrations missed by other methods. This noninvasive technique is valuable for routine diagnostic x-ray quality control.

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    Area of Science:

    • Medical Physics
    • Diagnostic Imaging
    • Radiologic Technology

    Background:

    • Accurate measurement of x-ray tube current (mA) is critical for diagnostic imaging quality and patient safety.
    • Traditional mA measurement methods may have limitations in accuracy or sensitivity to miscalibration.

    Purpose of the Study:

    • To evaluate the efficacy of a clamp-on Hall effect current probe for measuring x-ray tube current.
    • To compare the Hall effect probe's performance against established mA measurement techniques.

    Main Methods:

    • A Hall effect clamp-on current probe was employed to measure x-ray tube current.
    • Measurements were compared with a Machlett Dynalyzer and the mR/mAs linearity method.
    • Three diagnostic x-ray units (two modern three-phase, one older single-phase) were tested.

    Main Results:

    • The Hall effect current probe and Dynalyzer measurements agreed within +/- 3%.
    • Both methods identified mA miscalibrations at various technique settings.
    • The mR/mAs linearity method failed to detect these miscalibrations.

    Conclusions:

    • The Hall effect current probe is a reliable, noninvasive tool for routine diagnostic x-ray quality control.
    • It offers improved detection of mA miscalibration compared to the mR/mAs linearity method.
    • Potential susceptibility to electronic noise below 100 mA requires consideration.

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