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Proton Therapy Delivery and Its Clinical Application in Select Solid Tumor Malignancies
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Dosimetric consequences of intrafraction prostate motion.

Haisen S Li1, Indrin J Chetty, Charles A Enke

  • 1Department of Radiation Oncology, University of Nebraska Medical Center, Omaha, NE, USA. haisenli@unmc.edu

International Journal of Radiation Oncology, Biology, Physics
|February 1, 2008
PubMed
Summary

Intrafraction prostate motion during radiotherapy has minimal dosimetric impact with clinical target volume (CTV) to planning target volume (PTV) margins of 2 mm or greater when using the Calypso system. Reduced margins improve organ sparing.

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Area of Science:

  • Radiation Oncology
  • Medical Physics
  • Prostate Cancer Treatment

Background:

  • Intrafraction motion during radiotherapy can affect treatment accuracy.
  • Accurate monitoring of prostate motion is crucial for dose delivery.
  • Understanding dosimetric consequences of motion is essential for optimizing treatment margins.

Purpose of the Study:

  • To analyze intrafraction prostate motion using the Calypso system.
  • To investigate the dosimetric impact of this motion on different clinical target volume (CTV) to planning target volume (PTV) margins.
  • To evaluate effects on prostate dose coverage and organ-at-risk sparing.

Main Methods:

  • Analysis of 1,267 tracking sessions from 35 patients.
  • Evaluation of dose metrics for prostate, bladder, and rectum with CTV-PTV margins of 0, 1, 2, 3, and 5 mm.
  • Calculation of composite dose distributions incorporating motion blurring using probability functions.

Main Results:

  • Prostate dose coverage was not compromised with margins of 2 mm or greater.
  • Even in the highest motion scenarios, prostate equivalent uniform dose reduction was minimal (<0.51%).
  • Reduced margins significantly improved sparing of the bladder and rectum.

Conclusions:

  • Intrafraction prostate motion has insignificant dosimetric consequences with 2 mm or greater CTV-PTV margins and Calypso system use.
  • Further margin reduction is feasible with intrafraction realignment.
  • This supports adaptive radiotherapy strategies for prostate cancer.