Radio Frequency Coil Design for Ultra High Field MRI

超高场 MRI 射频线圈设计

• 批准号: 261701-2012
• 负责人: Menon, Ravi
• 金额: $ 4.44万
• 依托单位: University of Western Ontario
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2017
• 资助国家: 加拿大
• 起止时间: 2017-01-01 至 2018-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=632924
• 关键词: Radio; Frequency; Coil; Design; Ultra

Radio Frequency (RF) coils are an essential component of magnetic resonance imaging (MRI) systems. Due to RF field/tissue interactions in the human body at high magnetic fields (>= 3 T) the transmit profile from head-sized volume coils shows a distinctive pattern with a relatively strong RF magnetic field B(1+) in the center of the brain, This centre brightening effect can affect both quantitative and qualitative aspects of the image or spectrum. Even more troubling, constructive and destructive B(1+) patterns are found throughout the volume of interest due to the in homogeneities brought about by tissue-B(1+) field interaction The objective of our research program is to design RF coil assemblies that minimize the transmit (B1+) and receive (B1-) field RF in homogeneities at 7 T in human subjects.Our MRI system is probably the most advanced configuration of transmit and receive channels in the world which makes us we well positioned to continue the science and engineering for a new generation of RF array coils. Several MRI manufacturers are developing multiple-transmit RF capabilities on their systems to help overcome the RF in homogeneities that occur in human subjects in ultra-high field MRI scanners, and this is an area of intense development with over 50 instruments for MRI of humans at 7 T and higher worldwide and a growth rate of 5-10 units a year. RF inhomogeneity and power deposition are significant barriers for the adoption of these systems more broadly and our research has strong academic and industrial potential to alleviate these problems.

射频 (RF) 线圈是磁共振成像 (MRI) 系统的重要组成部分。由于人体在高磁场 (>= 3 T) 下的射频场/组织相互作用，头部大小的体积线圈的发射曲线显示出一种独特的模式，其中中心有相对较强的射频磁场 B(1+)。在大脑中，这种中心增亮效应可以影响图像或光谱的定量和定性方面。由于组织-B(1+) 场相互作用带来的不均匀性，在整个感兴趣的体积中发现了更令人不安的、建设性和破坏性的 B(1+) 模式。我们研究计划的目标是设计射频线圈组件，最大限度地减少人类受试者中 7 T 均匀性的发射 (B1+) 和接收 (B1-) 场射频。我们的 MRI 系统可能是世界上最先进的发射和接收通道配置，这使我们处于继续科学研究的有利位置和新一代射频阵列线圈的工程。一些 MRI 制造商正在其系统上开发多发射 RF 功能，以帮助克服超高场 MRI 扫描仪中人类受试者中出现的同质性 RF，这是一个正在大力发展的领域，目前有超过 50 种用于人体 MRI 的仪器。全球 7 T 及以上，每年增长 5-10 台。射频不均匀性和功率沉积是更广泛地采用这些系统的重大障碍，我们的研究具有缓解这些问题的强大学术和工业潜力。