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: 2015
• 资助国家: 加拿大
• 起止时间: 2015-01-01 至 2016-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=571122
• 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）系统的重要组件。由于在高磁场（>= 3 T）下人体内的RF场/组织相互作用，头部大小的体积线圈的发射曲线显示出独特的模式，其中大脑中心具有相对较强的RF磁场B（1+）。该中心增亮效应可以影响图像或频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，在整个感兴趣体积中发现了更令人不安的建设性和破坏性B（1+）模式。我们研究计划的目的是设计RF线圈组件，使人体受试者在7 T下的发射（B1+）和接收（B1-）场RF不均匀性最小化。 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，这使我们能够继续进行新一代RF阵列线圈的科学和工程研究。几家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出现的均匀性中的RF，这是一个激烈发展的领域，全球有超过50种用于7 T及更高温度下人类MRI的仪器，每年增长5-10台。RF不均匀性和功率沉积是更广泛地采用这些系统的重要障碍，我们的研究具有很强的学术和工业潜力来缓解这些问题。