Silva Nivia Aparecida, Nicolucci Patricia, Baffa Oswaldo
Departamento de Física e Matemática-FFCLRP-Universidade de São Paulo, 14040-901-Ribeirão Preto, SP, Brazil.
Med Phys. 2003 Jan;30(1):17-20. doi: 10.1118/1.1527039.
The spatial accuracy of magnetic resonance imaging (MRI) Fricke-gel dosimetry is limited by diffusion of ferric ions. This paper describes a honeycomb structure to limit diffusion of Fe3+ ions in a three-dimensional phantom. Such a phantom containing the dosimeter gel was irradiated to a known dose distribution. Maps of dose distributions were produced from the MR images acquired at 2 and 24 hours after the dose was given. The dose distribution maps verified that the honeycomb structure precludes ion diffusion from one honeycomb cell to another, thus improving the usefulness of MRI Fricke-gel dosimetry.
磁共振成像（MRI）弗里克凝胶剂量测定法的空间精度受铁离子扩散的限制。本文描述了一种蜂窝结构，以限制Fe3+离子在三维体模中的扩散。将含有剂量计凝胶的这种体模照射至已知剂量分布。在给予剂量后2小时和24小时采集的磁共振图像生成了剂量分布图。剂量分布图证实，蜂窝结构可防止离子从一个蜂窝单元扩散到另一个蜂窝单元，从而提高了MRI弗里克凝胶剂量测定法的实用性。
