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Proton Therapy Delivery and Its Clinical Application in Select Solid Tumor Malignancies
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Electromagnetic transponders indicate prostate size increase followed by decrease during the course of external beam

Benjamin L King1, Wayne M Butler, Gregory S Merrick

  • 1Radiation Oncology Department, University of Washington, Seattle, WA, USA.

International Journal of Radiation Oncology, Biology, Physics
|July 8, 2010
PubMed
Summary
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Prostate cancer radiation therapy using electromagnetic transponders showed initial prostate volume increase followed by significant, asymmetric shrinkage. Tracking these changes improves accuracy in real-time image-guided treatments.

Area of Science:

  • Radiation Oncology
  • Medical Physics
  • Oncology

Background:

  • Real-time image guidance is crucial for accurate radiation therapy.
  • Prostate movement and volume changes can lead to dosimetric inaccuracies.
  • Electromagnetic transponders offer a method for monitoring target position and volume.

Purpose of the Study:

  • To monitor prostate volume changes during radiation therapy using implanted transponders.
  • To assess the impact of volume fluctuations on treatment accuracy.
  • To correlate transponder data with prostate cancer radiation therapy outcomes.

Main Methods:

  • Three electromagnetic transponders were implanted in 24 prostate cancer patients.
  • The Calypso system tracked transponder coordinates to calculate prostate volume.

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  • Volume was monitored throughout radiation therapy to 81 Gy.

    • Main Results:

    • Mean prostate volume decreased by 10.9% during treatment.
    • Volume initially increased (mean 6.1%) before decreasing significantly (mean max 18.4%).
    • Shrinkage was asymmetric, with greater variation in the apex-to-base dimension.

    Conclusions:

    • Prostate volume increases initially, then significantly shrinks asymmetrically during radiation therapy.
    • Real-time tracking of prostate volume fluctuations is essential for optimizing image-guided radiation therapy.
    • Understanding these dynamic changes can enhance the efficacy of radiation oncology treatments.