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首页> 外文期刊>Journal of magnetic resonance >A Tunable Reentrant Resonator with Transverse Orientation of Electric Field for in Vivo EPR Spectroscopy
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A Tunable Reentrant Resonator with Transverse Orientation of Electric Field for in Vivo EPR Spectroscopy

机译：体内EPR光谱的可调横电场谐振器。

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摘要

There has been a need for development of microwave responator designs optimized to provide high sensitivity and high stability for EPR spectroscopy and imaging measurements of in vivo systems. The design and construction of a novel reentrant resonator with transversely oriented electric field (TERR) and rectangular sample opening cross section for EPR spectroscopy and imaging of in vivo biological samples, such as the whole body of mice and rats, is described. This design with its transversely oriented capacitive element enables wide and simple setting of the center frequency by trimming the dimensions of the capacitive plate over the range 100-900 MHz with unloaded Q values of approximately 1100 at 750 MHz, while the mechanical adjustment mechanism allows smooth continuous frequency tuning in the range +-50 MHZ. This orientation of the capacitive element limits the electric field based loss of resonator Q observed with large lossy samples, and it facilitates the use of capacitive coupling. Both microwave performance data and EPR measurements of aqueous samples demonstrate high sensitivity and stability of the design, which make it well suited for in vivo applications.
机译：需要开发微波响应器设计，其被优化以为EPR光谱和体内系统的成像测量提供高灵敏度和高稳定性。描述了一种新型的具有横向电场（TERR）和矩形样品开口横截面的折返谐振器的设计和构造，该谐振器用于EPR光谱和体内生物样品（例如小鼠和大鼠的全身）成像。这种带有横向电容元件的设计可通过在100-900 MHz范围内修整电容板的尺寸，并在750 MHz处的空载Q值约为1100的情况下，实现宽而简单的中心频率设置，连续频率调谐范围为+ -50 MHZ。电容性元件的这种取向限制了在大损耗样本中观察到的基于谐振器Q的电场损耗，并且它促进了电容性耦合的使用。微波性能数据和水性样品的EPR测量均显示出设计的高灵敏度和稳定性，使其非常适合于体内应用。

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