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Related Experiment Videos

Gastrointestinal fluoroscopy: patient dose and methods for its reduction.

S J Leibovic, W J Caldicott

    The British Journal of Radiology
    |October 1, 1983
    PubMed
    Summary

    This study introduces a method to measure patient radiation exposure during gastro-intestinal fluoroscopy. Findings show contrast media significantly increases exposure, necessitating equipment modifications for dose reduction.

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    Area of Science:

    • Medical Physics
    • Radiology
    • Pediatric Imaging

    Background:

    • Fluoroscopy is essential for gastro-intestinal contrast examinations.
    • Accurate measurement of patient radiation dose during these procedures is crucial.
    • Limited data exists on patient radiation exposure during pediatric fluoroscopic examinations.

    Purpose of the Study:

    • To present a method for identifying factors contributing to patient radiation exposure during gastro-intestinal fluoroscopy.
    • To quantify patient radiation dose across various pediatric gastro-intestinal contrast examinations.
    • To evaluate the impact of contrast media and equipment settings on radiation dose.

    Main Methods:

    • Measurements of X-ray exposure at the collimator level were extrapolated to estimate patient entrance surface dose.

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  • A cohort of 65 pediatric patients (1 month to 21 years) undergoing barium swallow, meal, small bowel, and enema examinations were studied.
  • Gonadal doses were measured in male patients.

    • Main Results:

    • Median entrance surface doses varied by examination type, with barium enemas showing a wide range (0.93-7.7 mC/kg).
    • Contrast media presence increased spot film exposure by up to 16 times and fluoroscopic rates by over 2 times.
    • Gonadal doses in males ranged from undetectable to 0.71 mGy.

    Conclusions:

    • A reliable method for assessing patient radiation exposure during pediatric gastro-intestinal fluoroscopy has been demonstrated.
    • Contrast media significantly elevates radiation dose, highlighting the need for careful technique.
    • Modifications to fluoroscopic equipment, such as high/low dose switches and variable aperture diaphragms, can effectively reduce patient exposure.