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Related Experiment Videos

Prostate immobilization using a rectal balloon.

John E McGary1, Bin S Teh, E Brian Butler

  • 1Department of Radiology, Baylor College of Medicine, Houston, Texas, USA. jmcgary@earthlink.net

Journal of Applied Clinical Medical Physics
|January 31, 2002
PubMed
Summary
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A rectal balloon effectively immobilizes the prostate during intensity modulated radiotherapy (IMRT). Studies show minimal prostate displacement, ensuring accurate treatment targeting with this method.

Area of Science:

  • Radiation Oncology
  • Medical Physics
  • Urology

Background:

  • Prostate immobilization is crucial for accurate intensity modulated radiotherapy (IMRT).
  • Rectal balloons are used to improve prostate positioning during treatment.
  • Assessing prostate displacement is key to refining treatment planning target volumes.

Purpose of the Study:

  • To quantify prostate displacements during IMRT using a rectal balloon.
  • To evaluate the accuracy of prostate planning target volumes with this immobilization technique.
  • To assess the impact of breathing on prostate motion during treatment.

Main Methods:

  • Utilized computed tomography (CT)-CT fusion for prostate displacement measurement.
  • Included ten patients undergoing IMRT with prior gold seed implants.

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  • Performed biweekly CT scans and breathing studies to monitor organ motion.

    • Main Results:

    • Prostate displacement in anterior-posterior and lateral directions was minimal, within measurement uncertainty (~1 mm).
    • The standard deviation for superior-inferior (SI) prostate displacements was 1.78 mm.
    • Breathing studies detected no significant organ displacement under normal breathing conditions with a rectal balloon.

    Conclusions:

    • Rectal balloon use demonstrates effective prostate immobilization during IMRT.
    • The technique contributes to accurate prostate planning target volumes.
    • Minimal organ motion observed suggests reliable treatment delivery with this method.