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WE-G-BRCD-06: Knowledge-Based Intensity Modulated Radiotherapy (IMRT) Treatment Planning for Prostate Cancer.

D Dick1, S Das1, J Lo1

  • 1Duke University Medical Center, Durham, NC.

Medical Physics
|May 19, 2017
PubMed
Summary
This summary is machine-generated.

Knowledge-based intensity modulated radiotherapy (IMRT) planning creates high-quality prostate cancer treatment plans comparable to existing ones. This approach can semi-automatically generate excellent plans, significantly reducing planning time.

Keywords:
AnatomyCancerDatabasesDosimetryIntensity modulated radiation therapyMedical treatment planning

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Area of Science:

  • Radiation Oncology
  • Medical Physics
  • Computational Biology

Background:

  • Intensity modulated radiotherapy (IMRT) is a complex radiation therapy technique.
  • Treatment planning requires significant expertise and time.
  • Knowledge-based planning (KBP) aims to leverage past treatment data to improve efficiency and quality.

Purpose of the Study:

  • To evaluate a knowledge-based approach for IMRT treatment planning in prostate cancer.
  • To determine if KBP can achieve clinically acceptable plans with superior or equivalent dosimetric quality compared to prior plans.

Main Methods:

  • A database of 140 IMRT prostate plans was used.
  • A case-similarity algorithm identified best match cases based on 2D beam's eye view (BEV) projections and mutual information (MI).
  • Deformation maps and optimization algorithms were used to adapt and refine plans.

Main Results:

  • Post-optimized plans achieved 86% of dose constraints, slightly higher than original plans (84.3%).
  • Original plans showed smaller volumes receiving 65Gy for rectum (4.52%) and bladder (3.44%).
  • Post-optimized plans showed smaller volumes receiving 40Gy for rectum (1.53%) and bladder (3.65%).

Conclusions:

  • Knowledge-based planning produces IMRT plans of comparable or superior dosimetric quality.
  • This approach has the potential for semi-automatic generation of high-quality plans.
  • KBP can significantly reduce treatment planning time.