DEVELOPMENT OF L BAND THREE DIMENSIONAL ESR IMAGING SYSTEM(Ⅴ)——System Configuration and Performance Evaluation

Abstract

Abstract:

The detection sensitivity and the achievable spatial resolution of a newly developed L-band three-dimensional ESR imaging system were evaluated. The detection sensitivity was measured using a group of samples of aqueous Tempo solution. A signal to noise ratio (S/N) of about 4∶1 was obtained on a cylindric al sample with diameter of 10 mm and height of 30 mm, which corresponds to the minimum detectable concentration of 1×10^-4mol/L. To obtain projections with sufficient S/N for imaging, a higher concentration of more than 5×10^-4mol/L and a larger sample size (diameter of φ19 mm and height of 30 mm) was needed. Measured on solid DPPH samples, the spatial resolution of imaging can reach about 1 mm. The general performance features of the ESRI system were also discussed in the paper.

Key words: ESR, 3D-ESRI, sensitivity, resolution, performance feature

CLC Number:

O482.53

WU Ke, CONG Jian-Bo, ZHANG Qing-Jun, XIAN Hong, WANG Chang-Zhen, SUN Cun-Pu, ZHENG Ying-Guang, XU Jing, DONG Feng-Xia, SHEN Er-Zhong, XU Yu-Shu. DEVELOPMENT OF L BAND THREE DIMENSIONAL ESR IMAGING SYSTEM(Ⅴ)——System Configuration and Performance Evaluation[J]. Chinese Journal of Magnetic Resonance, 2004, 21(2): 159-164.

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