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Dose rate table for a 32 P intravascular brachytherapy source from Monte Carlo calculations
Author(s) -
Bohm Tim D.,
Mourtada Firas A.,
Das Rupak K.
Publication year - 2001
Publication title -
medical physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.473
H-Index - 180
eISSN - 2473-4209
pISSN - 0094-2405
DOI - 10.1118/1.1384459
Subject(s) - monte carlo method , brachytherapy , imaging phantom , scintillator , materials science , dosimetry , radioactive source , nuclear medicine , computational physics , ionization chamber , detector , physics , biomedical engineering , optics , medicine , mathematics , radiology , radiation therapy , statistics , ion , quantum mechanics , ionization
Studies of intravascular brachytherapy to prevent restenosis following angioplasty have shown many promising results. Accurate dose rate tables based on detailed models of the brachytherapy sources are necessary for treatment planning. This work will present an away and along dose rate table for a 27 mm long catheter based32 P beta source. MD‐55‐2 radiochromic film has been exposed at five different depths (0.5 mm–4 mm) in a polystyrene phantom using a 27 mm long Guidant32 P beta source. The total dose to the active region of the film was determined using the absolute detector response of the MD‐55‐2 radiochromic film. The Monte Carlo code MCNP4B2 was also used to calculate the dose to the active region of the film using a detailed model of the source, encapsulation, and radiochromic film. The dose to film calculations showed good agreement with the measurements presented in this work with an average difference of 7%. The Monte Carlo calculations were also verified against previously published depth dose in water measurements determined using radiochromic film and plastic scintillator. The depth dose calculations in water showed good agreement with the previously published measurements with the calculations being about 2.5% lower than the film measurements and about 2.5% higher than the scintillator measurements. This work then uses the verified Monte Carlo code to present a dose rate table for the32 P intravascular beta source.