Semi-empirical model for the generation of dose distributions produced by a scanning electron beam

Journal Article · Tue Jan 01 00:00:00 EST 1980 · Int. J. Radiat. Oncol., Biol. Phys.; (United States)

DOI:https://doi.org/10.1016/0360-3016(80)90205-9· OSTI ID:5255520

Nath, R; Gignac, C E; Agostinelli, A G; Rothberg, S; Schulz, R J

There are linear accelerators (Sagittaire and Saturne accelerators produced by Compagnie Generale de Radiologie (CGR/MeV) Corporation) which produce broad, flat electron fields by magnetically scanning the relatively narrow electron beam as it emerges from the accelerator vacuum system. A semi-empirical model, which mimics the scanning action of this type of accelerator, was developed for the generation of dose distributions in homogeneous media. The model employs the dose distributions of the scanning electron beams. These were measured with photographic film in a polystyrene phantom by turning off the magnetic scanning system. The mean deviation calculated from measured dose distributions is about 0.2%; a few points have deviations as large as 2 to 4% inside of the 50% isodose curve, but less than 8% outside of the 50% isodose curve. The model has been used to generate the electron beam library required by a modified version of a commercially-available computerized treatment-planning system. (The RAD-8 treatment planning system was purchased from the Digital Equipment Corporation. It is currently available from Electronic Music Industries (EMI), Ltd.)

• Research Organization: Yale Univ. School of Medicine, New Haven, CT
• OSTI ID: 5255520
• Journal Information: Int. J. Radiat. Oncol., Biol. Phys.; (United States), Vol. 6:1
• Country of Publication: United States
• Language: English

Related Subjects

61 RADIATION PROTECTION AND DOSIMETRY
62 RADIOLOGY AND NUCLEAR MEDICINE
ELECTRON BEAMS
DEPTH DOSE DISTRIBUTIONS
RADIOTHERAPY
ISODOSE CURVES
COMPUTER CODES
EXPERIMENTAL DATA
GRAPHS
LINEAR ACCELERATORS
MATHEMATICAL MODELS
MEV RANGE 01-10
MEV RANGE 10-100
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RADIOLOGY
SPATIAL DOSE DISTRIBUTIONS
STRUCTURAL MODELS
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655003* - Medical Physics- Dosimetry
550603 - Medicine- External Radiation in Therapy- (1980-)