Analysis of the photon beam treatment planning data for a scanning beam machine Journal Article
| Authors: | Lovelock, D. M. J.; Chui, C. S.; Kutcher, G. J.; Mohan, R. |
| Article Title: | Analysis of the photon beam treatment planning data for a scanning beam machine |
| Abstract: | The characteristics of photon beams from the Scanditronix MM50 radiation therapy machine that are necessary for treatment planning are described. The MM50 uses a scanning beam instead of a conventional flattening filter to achieve flat dose distributions. At each beam energy, a scan pattern is chosen, depending on the field size; the small scan pattern (S) is used for field sizes up to 10X10 cm, the medium scan pattern (M) is used for field sizes up to 20X20 cm, and the large scan pattern (L) is used for the larger field sizes. The dose distributions of the beams associated with the 10 MV S<sub/>M, and L scan patterns, the 25 MV S, M, and L patterns, and the 50 MV S and M patterns are described. The data reported includes central axis data, beam profiles, and output factors. In addition to the measured data, our dose calculation model requires a pencil beam kernel for each beam. The kernel is constructed using the average photon energy spectrum, which is generated using a Monte Carlo simulation of the MM50. The simulation, based on EGS4, is also used to generate the radial variation of fluence and energy fluence, which is required by a new dose calculation model that does not require the measurement of beam profiles. The Monte Carlo generated data; the photon energy spectrum, the fluence, and the energy fluence are presented. © 1994, American Association of Physicists in Medicine. All rights reserved. |
| Keywords: | nonhuman; treatment planning; radiation dose; analytic method; simulation; dosimetry; dose calculation; electron beam; scanning electron microscopy; pattern recognition; system analysis; monte carlo simulation; priority journal; article; racetrack microtron; x ray dose distribution; scanning photon beam |
| Journal Title: | Medical Physics |
| Volume: | 21 |
| Issue: | 12 |
| ISSN: | 0094-2405 |
| Publisher: | American Association of Physicists in Medicine |
| Date Published: | 1994-12-01 |
| Start Page: | 1969 |
| End Page: | 1977 |
| Language: | English |
| DOI: | 10.1118/1.597229 |
| PROVIDER: | scopus |
| PUBMED: | 7700205 |
| DOI/URL: | |
| Notes: | Export Date: 14 January 2019 -- Article -- Source: Scopus |
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