PHANTOM DESIGN, METHOD FOR HIGH-FIELD MRI HUMAN SYSTEMS

该子项目是利用 由NIH/NCRR资助的中心赠款提供的资源。子项目和 研究者（PI）可能从另一个NIH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 中心，不一定是研究者的机构。 提出了一种基于样品射频场波形特征的适用于高场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品内波长的样品尺寸以及位移电流和传导电流之间的比率确定。实验结果表明，在给定的场强下，与人体样本中的波行为相关的MR图像强度模式可以用相同或不同场强下的体模再现，一旦尺寸和穿透常数由样本介质中的相应波长缩放。

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.