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Knowledge-based IMRT treatment planning for prostate cancer.

Publication ,  Journal Article
Chanyavanich, V; Das, SK; Lee, WR; Lo, JY
Published in: Med Phys
May 2011

PURPOSE: To demonstrate the feasibility of using a knowledge base of prior treatment plans to generate new prostate intensity modulated radiation therapy (IMRT) plans. Each new case would be matched against others in the knowledge base. Once the best match is identified, that clinically approved plan is used to generate the new plan. METHODS: A database of 100 prostate IMRT treatment plans was assembled into an information-theoretic system. An algorithm based on mutual information was implemented to identify similar patient cases by matching 2D beam's eye view projections of contours. Ten randomly selected query cases were each matched with the most similar case from the database of prior clinically approved plans. Treatment parameters from the matched case were used to develop new treatment plans. A comparison of the differences in the dose-volume histograms between the new and the original treatment plans were analyzed. RESULTS: On average, the new knowledge-based plan is capable of achieving very comparable planning target volume coverage as the original plan, to within 2% as evaluated for D98, D95, and D1. Similarly, the dose to the rectum and dose to the bladder are also comparable to the original plan. For the rectum, the mean and standard deviation of the dose percentage differences for D20, D30, and D50 are 1.8% +/- 8.5%, -2.5% +/- 13.9%, and -13.9% +/- 23.6%, respectively. For the bladder, the mean and standard deviation of the dose percentage differences for D20, D30, and D50 are -5.9% +/- 10.8%, -12.2% +/- 14.6%, and -24.9% +/- 21.2%, respectively. A negative percentage difference indicates that the new plan has greater dose sparing as compared to the original plan. CONCLUSIONS: The authors demonstrate a knowledge-based approach of using prior clinically approved treatment plans to generate clinically acceptable treatment plans of high quality. This semiautomated approach has the potential to improve the efficiency of the treatment planning process while ensuring that high quality plans are developed.

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Published In

Med Phys

DOI

ISSN

0094-2405

Publication Date

May 2011

Volume

38

Issue

5

Start / End Page

2515 / 2522

Location

United States

Related Subject Headings

  • Treatment Outcome
  • Therapy, Computer-Assisted
  • Retrospective Studies
  • Radiotherapy, Conformal
  • Radiotherapy Planning, Computer-Assisted
  • Prostatic Neoplasms
  • Nuclear Medicine & Medical Imaging
  • Male
  • Knowledge Bases
  • Humans
 

Citation

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Chanyavanich, V., Das, S. K., Lee, W. R., & Lo, J. Y. (2011). Knowledge-based IMRT treatment planning for prostate cancer. Med Phys, 38(5), 2515–2522. https://doi.org/10.1118/1.3574874
Chanyavanich, Vorakarn, Shiva K. Das, William R. Lee, and Joseph Y. Lo. “Knowledge-based IMRT treatment planning for prostate cancer.Med Phys 38, no. 5 (May 2011): 2515–22. https://doi.org/10.1118/1.3574874.
Chanyavanich V, Das SK, Lee WR, Lo JY. Knowledge-based IMRT treatment planning for prostate cancer. Med Phys. 2011 May;38(5):2515–22.
Chanyavanich, Vorakarn, et al. “Knowledge-based IMRT treatment planning for prostate cancer.Med Phys, vol. 38, no. 5, May 2011, pp. 2515–22. Pubmed, doi:10.1118/1.3574874.
Chanyavanich V, Das SK, Lee WR, Lo JY. Knowledge-based IMRT treatment planning for prostate cancer. Med Phys. 2011 May;38(5):2515–2522.

Published In

Med Phys

DOI

ISSN

0094-2405

Publication Date

May 2011

Volume

38

Issue

5

Start / End Page

2515 / 2522

Location

United States

Related Subject Headings

  • Treatment Outcome
  • Therapy, Computer-Assisted
  • Retrospective Studies
  • Radiotherapy, Conformal
  • Radiotherapy Planning, Computer-Assisted
  • Prostatic Neoplasms
  • Nuclear Medicine & Medical Imaging
  • Male
  • Knowledge Bases
  • Humans