Repeatability of B1+ inhomogeneity correction of volumetric (3D) glutamate CEST via High‐permittivity dielectric padding at 7T

Ultra‐high field MR imaging lacks B1+ inhomogeneity due to shorter RF wavelengths used at higher field strengths compared to human anatomy. CEST techniques tend to be highly susceptible to B1+ inhomogeneities due to a high and uniform B1+ field being necessary to create the endogenous contrast. High‐permittivity dielectric pads have seen increasing usage in MR imaging due to their ability to tailor the spatial distribution of the B1+ field produced. The purpose of this work is to demonstrate that dielectric materials can be used to improve glutamate weighted CEST (gluCEST) at 7T.