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A Monte Carlo calculation of dosimetric parameters of 90 Sr / 90 Y and 192 Ir SS sources for intravascular brachytherapy
Author(s) -
Wang Ruqing,
Li X. Allen
Publication year - 2000
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 - 10.1118/1.1319374
Subject(s) - monte carlo method , brachytherapy , dosimetry , medical physics , nuclear medicine , radiology , medicine , radiation therapy , statistics , mathematics
The AAPM TG‐60 report has proposed various dose calculation parameters for intravascular brachytherapy (IVBT). These parameters include the dose rate constant (or the dose rate at a reference position for a beta‐particle emitting source), the radial dose function, and the anisotropy function. In this work, we have used a modified EGS4 Monte Carlo system to calculate these parameters for the two most commonly used IVBT sources (the beta‐particle emitting90Sr / 90 Y source and the photon emitting192 Ir SS source). To ensure the calculation accuracy, the present calculation was compared with several measurements and calculations reported by other authors. Excellent agreement was found for the results with the photon source. For beta‐particle source calculation, the present results for a variety of point sources agree very well with a previous work. The presently calculated radial dose functions for the90Sr / 90 Y source are consistent with those of a published work for intermediate radial distances. The dose uniformity in the axial direction was also studied. The contributions of bremsstrahlung photons to total doses for the90Sr / 90 Y beta source, and the influence of ignoring electron transport on calculated doses for the192 Ir SS photon source are discussed.