Intensity modulated irradiation of a thorax phantom: Comparisons between measurements, Monte Carlo calculations and pencil beam calculations

Wolfram Laub, Annemarie Bakai, Fridtjof Nüsslin

Research output: Contribution to journalArticle

28 Citations (Scopus)

Abstract

The present study investigates the application of compensators for the intensity modulated irradiation of a thorax phantom. Measurements are compared with Monte Carlo and standard pencil beam algorithm dose calculations. Compensators were manufactured to produce the intensity profiles that were generated from the scientific version of the KonRad IMRT treatment-planning system for a given treatment plan. The comparison of dose distributions calculated with a pencil beam algorithm, with the Monte Carlo code EGS4 and with measurements is presented. By measurements in a water phantom it is demonstrated that the method used to manufacture the compensators reproduces the intensity profiles in a suitable manner. Monte Carlo simulations in a water phantom show that the accelerator head model used for simulations is sufficient. No significant overestimations of dose values inside the target volume by the pencil beam algorithm are found in the thorax phantom. An overestimation of dose values in lung by the pencil beam algorithm is also not found. Expected dose calculation errors of the pencil beam algorithm are suppressed, because the dose to the low density region lung is reduced by the use of a non-coplanar beam arrangement and by intensity modulation.

Original languageEnglish (US)
Pages (from-to)1695-1706
Number of pages12
JournalPhysics in Medicine and Biology
Volume46
Issue number6
DOIs
StatePublished - 2001
Externally publishedYes

Fingerprint

pencil beams
thorax
Thorax
Irradiation
dosage
irradiation
compensators
lungs
Lung
Water
Particle accelerators
profiles
water
Head
planning
Modulation
accelerators
Planning
simulation
modulation

ASJC Scopus subject areas

  • Biomedical Engineering
  • Physics and Astronomy (miscellaneous)
  • Radiology Nuclear Medicine and imaging
  • Radiological and Ultrasound Technology

Cite this

Intensity modulated irradiation of a thorax phantom : Comparisons between measurements, Monte Carlo calculations and pencil beam calculations. / Laub, Wolfram; Bakai, Annemarie; Nüsslin, Fridtjof.

In: Physics in Medicine and Biology, Vol. 46, No. 6, 2001, p. 1695-1706.

Research output: Contribution to journalArticle

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