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Related Experiment Video

Updated: May 30, 2026

Use of MRI-ultrasound Fusion to Achieve Targeted Prostate Biopsy
09:11

Use of MRI-ultrasound Fusion to Achieve Targeted Prostate Biopsy

Published on: April 9, 2019

Individualized margins for prostate patients using a wireless localization and tracking system.

Prema Rassiah-Szegedi1, Brian Wang, Martin Szegedi

  • 1University of Utah. prema.rassiah-szegedi@hci.utah.edu.

Journal of Applied Clinical Medical Physics
|August 17, 2011
PubMed
Summary
This summary is machine-generated.

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Patient-specific margins for prostate cancer significantly reduce planning target volume (PTV) and critical organ doses. This individualized margin (IM) approach offers dosimetric benefits compared to conventional or uniform margins, improving treatment safety.

Area of Science:

  • Radiation Oncology
  • Medical Physics

Background:

  • Accurate radiation delivery for prostate cancer requires precise target volume definition.
  • Uncertainties in tumor motion necessitate planning margins, which can increase dose to organs at risk.

Purpose of the Study:

  • To investigate the dosimetric advantages of patient-specific, individualized margins (IM) for prostate cancer radiotherapy.
  • To compare IM planning target volumes (PTV) and organ doses against conventional (CM) and uniform margins (5 mm, 7 mm).

Main Methods:

  • Ten prostate cancer patients underwent 4D localization and tracking with radiofrequency transponders over 40 fractions.
  • Retrospective analysis of tracking data informed the design of individualized margins (IM) for each patient.
  • Intensity-modulated radiation therapy (IMRT) plans were generated for CM, 5 mm, 7 mm, and IM strategies with identical constraints.

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Main Results:

  • Individualized margin (IM) plans generally resulted in the smallest PTV volumes.
  • For comparable PTV coverage, IM plans achieved lower mean bladder (rectal) doses by 3.9% (2.5%) vs. 5 mm, 8.5% (5.7%) vs. 7 mm, and 16.2% (9.8%) vs. CM.
  • IM plans demonstrated the lowest bladder generalized Equivalent Uniform Dose (gEUD) and rectum Normal Tissue Complication Probability (NTCP).

Conclusions:

  • Patient-specific individualized margins significantly reduce PTV volumes and critical structure doses in prostate cancer radiotherapy.
  • This approach ensures adequate CTV coverage while enhancing treatment safety by minimizing irradiated healthy tissues.
  • Individualized margins represent a promising strategy for optimizing radiation therapy planning and delivery.