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首页> 外文期刊>Applied radiation and isotopes: including data, instrumentation and methods for use in agriculture, industry and medicine >A High Resolution EPR-CT Microscope Using Cavity-resonators Equipped with Small Field Gradient Coils
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A High Resolution EPR-CT Microscope Using Cavity-resonators Equipped with Small Field Gradient Coils

机译:使用配备小场梯度线圈的腔谐振器的高分辨率EPR-CT显微镜

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Cylindrical cavity resonators equipped with field gradient coils were developed for two-dimensional EPR-CT microscope systems. The field gradient coils He in four (or six) thin metal tubes placed along the direction of the microwave magnetic field inthe cavity to minimize impact on the resonator's quality factor. Two pairs of the tubes cany a 100 kHz current for magnetic field modulation. This cavity has high spin-detection sensitivity and can provide EPR images with submillimeter resolution. In order to reconstruct better images from fewer projections, we used an algebraic reconstruction technique (ART) for the two-dimensional image reconstruction. The ART method may be suitable for not only spectral-spatial two-dimensional EPR imaging, but also spatio-temporal EPR imaging in dynamic spin systems.
机译:为二维EPR-CT显微镜系统开发了配备场梯度线圈的圆柱腔谐振器。场梯度线圈He沿着空腔中微波磁场的方向放置在四个(或六个)细金属管中,以最大程度地减小对谐振器品质因数的影响。两对电子管产生100 kHz的电流以进行磁场调制。该腔具有很高的自旋检测灵敏度,可以提供亚毫米分辨率的EPR图像。为了从较少的投影中重建更好的图像,我们使用了代数重建技术(ART)进行了二维图像重建。 ART方法不仅适用于光谱空间二维EPR成像,而且适用于动态自旋系统中的时空EPR成像。

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