Dose characteristics of the 125i seeds for prostate brachytherapy

T. Matsunaga, N. Kataoka, K. Yasui, T. Shimozato, H. Fuse, Y. Oribe, Y. Igarashi, M. Komori, Y. Obata

Research output: Contribution to conferencePaperpeer-review

Abstract

In Japan, two 125I brachytherapy sources, the Amersham Health model 6711 and the SourceTech Medical model STM1251, areused for the treatment of prostate cancer. Because of the differences of the external geometry and the internal material between two sources, the dose characteristics are also different. We calculated the photon energy spectra, the radial dose function, and the anisotropy function of two sources using Monte Carlo (MC) simulation. The photon energy spectra of the 6711 included characteristic X-rays from the internal rod (Ag), but that of the STM1251 didn't include characteristic X-rays from the internal rod (Au). The discrepancies of the radial dose function between two 125I sources ranged from -3.2 to 3.0 %. The discrepancy of the anisotropy function between two 125I sources was -24.6 % (5°), and ranged from -4.0 to 5.3 % (> 10°). It seems that these discrepancies were derived from existence or nonexistence of characteristic X-rays from the internal rod and the differences of the geometry of Ti capsule.

Original languageEnglish
Pages25-32
Number of pages8
Publication statusPublished - 2010
Externally publishedYes
Event17th EGS Users' Meeting in Japan 2010 - Tsukuba, Japan
Duration: 02-08-201004-08-2010

Other

Other17th EGS Users' Meeting in Japan 2010
CountryJapan
CityTsukuba
Period02-08-1004-08-10

All Science Journal Classification (ASJC) codes

  • Software

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