PHANTOM DESIGN, METHOD FOR HIGH-FIELD MRI HUMAN SYSTEMS

该子项目是利用该技术的众多研究子项目之一 资源由 NIH/NCRR 资助的中心拨款提供。子项目及 研究者 (PI) 可能已从 NIH 的另一个来源获得主要资金， 因此可以在其他 CRISP 条目中表示。列出的机构是 对于中心来说，它不一定是研究者的机构。 提出了一种基于样本射频场波特性的适用于高场MRI的体模设计方法，并在7.0 T和3.0 T下进行了实验验证。具有给定 RF 线圈系统的体模中的 RF 场分布主要由相对于样本内部波长的样本大小以及位移电流和传导电流之间的比率决定。实验结果表明，一旦尺寸和穿透常数按样本介质中的相应波长缩放，在给定场强下与人体样本中的波行为相关的 MR 图像强度图案可以在相同或不同场强下用体模再现。

This subproject is one of many research subprojects utilizing the resources provided by a Center grant funded by NIH/NCRR. The subproject and investigator (PI) may have received primary funding from another NIH source, and thus could be represented in other CRISP entries. The institution listed is for the Center, which is not necessarily the institution for the investigator. A phantom design method suitable for high-field MRI based on the RF field wave characteristics of sample and experimental validations at 7.0 T and 3.0 T are presented. The RF field distribution in a phantom with a given RF coil system is primarily determined by the sample size relative to the wavelength inside the sample, and the ratio between the displacement and conduction currents. Experimental results demonstrate that the MR image intensity patterns associated with wave behavior in human samples at a given field strength can be reproduced with a phantom at the same or different field strengths once the dimension and penetration constant are scaled by the corresponding wavelength in the sample medium.