Duan Yuting, Zhang Menglong, Wang Gang, Du Liqing
Liaocheng People's Hospital, Liaocheng, China.
Australas Phys Eng Sci Med. 2012 Sep;35(3):291-6. doi: 10.1007/s13246-012-0152-2. Epub 2012 Jul 6.
Successful treatment for permanent implant brachytherapy is based on accurate measurement of dosimetry parameters for the seed sources. Literature describes the application of various types of phantom to determine the AAPM TG-43 dosimetry parameters for permanent implant seeds. Previously we created a new type of phantom used to measure the dosimetry parameters of a high dose-rate (192)Ir source. In this study, we modified the phantom to suit to a common type of (125)I seed source (Sinko BT-125-1). The dose-rate constant, radial dose function and anisotropy function of this source were measured in detail and compared with the published values of other similar in-design (125)I seed sources. The experimental results exhibit fairly small measurement uncertainties and good self-consistency. The modified phantom is demonstrated on the measurement of dosimetry parameters for the Sinko BT-125-1 (125)I seed, however, it could easily be used for similar measurements of other permanent implantation seed sources.
永久性植入近距离放射治疗的成功治疗基于对籽源剂量学参数的精确测量。文献描述了各种类型模体在确定永久性植入籽源的AAPM TG - 43剂量学参数方面的应用。此前我们制作了一种新型模体，用于测量高剂量率（192）铱源的剂量学参数。在本研究中，我们对该模体进行了改进，使其适用于一种常见类型的（125）碘籽源（Sinko BT - 125 - 1）。详细测量了该源的剂量率常数、径向剂量函数和各向异性函数，并与其他设计类似的（125）碘籽源的已发表值进行了比较。实验结果显示测量不确定度相当小且自洽性良好。改进后的模体用于测量Sinko BT - 125 - 1（125）碘籽源的剂量学参数，然而，它也可轻松用于其他永久性植入籽源的类似测量。
