Publications [#268997] of G. Allan Johnson

Papers Published

1. Hurlston, SE; Brey, WW; Suddarth, SA; Johnson, GA, A high-temperature superconducting Helmholtz probe for microscopy at 9.4 T., Magn Reson Med, vol. 41 no. 5 (May, 1999), pp. 1032-1038, ISSN 0740-3194 [10332887], [doi]
   (last updated on 2025/07/06)

   Abstract:
   The design and operation of a high-temperature superconducting (HTS) probe for magnetic resonance microscopy (MRM) at 400 MHz are presented. The design of the probe includes a Helmholtz coil configuration and a stable open-cycle cooling mechanism. Characterization of coil operating parameters is presented to demonstrate the suitability of cryo-cooled coils for MRM. Specifically, the performance of the probe is evaluated by comparison of signal-to-noise (SNR) performance with that of a copper Helmholtz pair, analysis of B1 field homogeneity, and quantification of thermal stability. Images are presented to demonstrate the SNR advantage of the probe for typical MRM applications.