PMID: 11318312Apr 25, 2001

Intensity modulated proton therapy: a clinical example

Medical Physics
Antony J LomaxL Wisser

Abstract

In this paper, we report on the clinical application of fully automated three-dimensional intensity modulated proton therapy, as applied to a 34-year-old patient presenting with a thoracic chordoma. Due to the anatomically challenging position of the lesion, a three-field technique was adopted in which fields incident through the lungs and heart, as well as beams directed directly at the spinal cord, could be avoided. A homogeneous target dose and sparing of the spinal cord was achieved through field patching and computer optimization of the 3D fluence of each field. Sensitivity of the resultant plan to delivery and calculational errors was determined through both the assessment of the potential effects of range and patient setup errors, and by the application of Monte Carlo dose calculation methods. Ionization chamber profile measurements and 2D dosimetry using a scintillator/CCD camera arrangement were performed to verify the calculated fields in water. Modeling of a 10% overshoot of proton range showed that the maximum dose to the spinal cord remained unchanged, but setup error analysis showed that dose homogeneity in the target volume could be sensitive to offsets in the AP direction. No significant difference between the M...Continue Reading

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Related Concepts

Chordoma
Dose-Response Relationship, Radiation
Monte Carlo Method
Protons
Nuclear Track Detection
Spinal Cord
Thoracic Neoplasms
Video Recording
Radiotherapy, Conformal

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