Keywords: Probes & Targets, Preclinical, Resonators, Transmit-Receive Coil
Motivation: High permittivity dielectric resonators for high resolution MRI are fabricated ferroelectric materials and have a large temperature coefficient, which produces a significant frequency variation in a small temperature range.
Goal(s): Reduce the temperature coefficient in dielectric resonators through a composite design.
Approach: Depending on the Curie temperature of BST, single layered dielectric resonators have positive or negative temperature dependance of resonant frequency. Bi-layered resonators combine positive and negative coefficients to create a temperature stable resonant frequency.
Results: Bi-layered resonators show on average a 75% reduction in frequency variation compared to single layers.
Impact: Bi-layered resonators are a first step in overcoming high temperature coefficients present in high permittivity dielectric resonators. With further improvements, this method can be used to significantly increase SNR in preclinical studies.
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