Physical and dosimetric aspects of a multileaf collimation system used in the dynamic mode for implementing intensity modulated radiotherapy Journal Article


Authors: LoSasso, T.; Chui, C. S.; Ling, C. C.
Article Title: Physical and dosimetric aspects of a multileaf collimation system used in the dynamic mode for implementing intensity modulated radiotherapy
Abstract: The use of a multileaf collimator in the dynamic mode to perform intensity modulated radiotherapy became a reality at our institution in 1995. Unlike treatment with static fields using a multileaf collimator, there are significant dosimetric issues which must be assessed before dynamic therapy can be implemented. We have performed a series of calculations and measurements to quantify head scatter for small fields, collimator transmission, and the transmission through rounded leaf ends. If not accounted for, these factors affect the delivered dose to the prostate by 5%- 20% for a typical plan. Data obtained with ion chambers and radiographic film are presented for both 6 and 15 MV x-ray beams. The impact on the delivered dose of the mechanical accuracy of the multileaf collimator, achieved during leaf position calibration and maintained during dose delivery, is also discussed.
Keywords: cancer radiotherapy; neoplasms; reproducibility; accuracy; quality control; calibration; prostatic neoplasms; prostate; dosimetry; quality assurance; quality assurance, health care; intensity modulation; collimator; radiometry; radiotherapy planning, computer-assisted; ionization chamber; polystyrene; phantom; phantoms, imaging; radiotherapy, high-energy; x-ray film; maxilla; mandible; x ray; biophysics; multileaf collimator; x ray film; scattering, radiation; humans; male; priority journal; article
Journal Title: Medical Physics
Volume: 25
Issue: 10
ISSN: 0094-2405
Publisher: American Association of Physicists in Medicine  
Date Published: 1998-10-01
Start Page: 1919
End Page: 1927
Language: English
DOI: 10.1118/1.598381
PUBMED: 9800699
PROVIDER: scopus
DOI/URL:
Notes: Article -- Export Date: 12 December 2016 -- Source: Scopus
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MSK Authors
  1. C Clifton Ling
    322 Ling
  2. Thomas J LoSasso
    89 LoSasso
  3. Chen Chui
    116 Chui