Abstract
This study examines the enlargement of the field of view (FOV) and the maintenance of a high signal-to-noise ratio (SNR) through the use of two high-temperature superconducting (HTS) resonators in a 3T MRI. Two Bi2Sr2Ca2Cu3Ox (Bi-2223) surface resonators, each of 4-cm diameter, were used in a 3T MRI. Professionally made copper resonators operate at 300 K, but each Bi-2223 resonator, operated at 77 K and demonstrated a 3.75 fold increase in SNR gain. For the same scanning time, the SNR of the images of a rat’s brain and back, obtained using two small Bi-2223 surface resonators, was higher than that obtained using a single 8-cm surface resonator.
Highlights
Magnetic Resonance Imaging (MRI) has become widespread in biomedical research
The MRI image is correlated with the signalto-noise ratio (SNR) of the magnetic resonance (MR) signals induced in the imaging resonators
This paper investigates the enlargement of the field of view (FOV) and maintenance of a high SNR through the use of two 4-cm Bi-2223 surface resonators, instead of a single 8-cm high-temperature superconducting (HTS) surface resonator
Summary
The MRI image is correlated with the signalto-noise ratio (SNR) of the magnetic resonance (MR) signals induced in the imaging resonators. These MR signals are weak, because of the small difference in the proton populations of the parallel and anti-parallel spins (,18 ppm at 3T for protons) that contribute to the signal [1]. Grasso et al [7] measured the quality factor (QF) of HTS tape surface resonators made using Bi-2223 tapes and observed that the QF values were four times higher than those of commercially available MRI resonators, at 8 MHz. Jing et al [8] theoretically measured the QF value of Bi-2223 surface resonators and verified the performance of Bi-2223 surface resonators by experiment. These two studies reported that Bi-2223 surface resonators can yield a higher SNR than copper surface resonators
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