Spinal cord gray‐matter imaging is valuable for a number of applications, but remains challenging. The purpose of this work was to compare various MRI protocols at 1.5 T, 3 T, and 7 T for visualizing the gray matter.
In vivo data of the cervical spinal cord were collected from nine different imaging centers. Data processing consisted of automatically segmenting the spinal cord and...
Slice‐wise shimming can improve field homogeneity, but suffers from large noise propagation in the shim calculation. Here, we propose a robust shim current optimization for higher‐order dynamic shim updating, based on Tikhonov regularization with a variable regularization parameter, .
Theory and Methods
was selected for each slice separately in a fully automatic procedure based on a...
To calibrate a pre‐emphasis to sufficiently compensate eddy currents for application of dynamic shim updating to fMRI without extension of scan times.
Eddy current effects induced into all shim terms up to third‐order were characterized by spatiotemporal field monitoring, using a third‐order field camera. Pre‐emphasis settings were derived from the measurements and iteratively evaluated...
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