IN VIVO EPR SPECTROMETRY VIA 200 MHZ FIELD SWITCHING

通过 200 MHZ 场切换进行体内 EPR 光谱测定

• 批准号: 3432127
• 负责人: JOSEPH J. H. ACKERMAN
• 金额: $ 5.5万
• 依托单位: WASHINGTON UNIVERSITY
• 依托单位国家: 美国
• 财政年份: 1992
• 资助国家: 美国
• 起止时间: 1992-09-30 至 1994-09-29
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/3432127
• 关键词: biomedical equipment; electron spin resonance spectroscopy; technology /technique development

Because of its non-invasive/non-destructive nature, magnetic resonance techniques represent powerful approaches to a host of basic and clinical biomedical research problems. Nuclear magnetic resonance (NMR) in particular has seen an explosion in applications to in vivo systems ranging from small animal models to man. Nevertheless, NMR applications are severely restricted by extremely poor signal-to-noise sensitivity. For many applications, electron paramagnetic resonance (EPR) offers greatly improved SIN if major technical problems associated with large conductive samples can be solved. For example, in vivo EPR experiments at standard microwave frequencies suffer extreme microwave sample-- penetration limitations and antenna sensitivity damping. Herein we propose an unorthodox EPR spectrometer design utilizing fast field switching (FFS) that if successful will enable routine low field (70 Gauss/200 MHz) EPR experiments in vivo. Operation at radio frequencies greatly reduces conductive sample related technical difficulties. This design, by avoiding microwave interrogation pulses, allows for extremely fast receiver recovery with spectrometer dead times less than 10 ns expected. This will allow a wide range of electron spin labels to be used. The short spin lattice relaxation times of electron spins will allow very efficient time averaging further increasing S/N. The FFS-EPR design makes use of only recently available high current fast switching transistors. We know of no other laboratory currently pursuing this design strategy. If successful this approach to in vivo EPR will make accessible to magnetic resonance techniques an entirely new regime of biomedical research problems.

由于它的非侵入性/非破坏性，磁共振

项目成果

Transient magnetic resonance without RF pulses: fast field switching.

无射频脉冲的瞬态磁共振：快速场切换。

• DOI: 10.1006/jmre.1999.1745
• 发表时间: 1999
• 期刊: Journal of magnetic resonance (San Diego, Calif. : 1997)
• 作者: Sloop,DJ;Lin,TS;Ackerman,JJ
• 通讯作者: Ackerman,JJ