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Description Simulated shimming performance is compared for six shim array geometries and spherical harmonics up to sixth order using a reference ΔB0 brain field map acquired at 3T (50 slices, 2 mm thickness)....
Article Title: A 32‐channel combined RF and B0 shim array for 3T brain imaging
Publication Title: Magnetic Resonance in Medicine -
Description Schematic for in‐house, low‐cost, digitally programmable shim supply circuit boards. The boards use paired OPA549 high‐current op amps controlled by current feedback from a 0.1 Ω current sense...
Article Title: A 32‐channel combined RF and B0 shim array for 3T brain imaging
Publication Title: Magnetic Resonance in Medicine -
Description ΔB0 field maps measured in balloon phantom (a) generated by 300 mA current in eight representative coils encircling the midplane of the brain. The independent spatial profiles of the coils are well...
Article Title: A 32‐channel combined RF and B0 shim array for 3T brain imaging
Publication Title: Magnetic Resonance in Medicine -
Description Synergies Between RF Receive Arrays and Multi‐Coil Shim Arrays
Article Title: A 32‐channel combined RF and B0 shim array for 3T brain imaging
Publication Title: Magnetic Resonance in Medicine -
Description SNR and interelement coil coupling are compared for the 32‐channel RF‐shim array before and after conversion, as well as for a size‐matched 32‐channel commercial receive coil (see Supporting Figure...
Article Title: A 32‐channel combined RF and B0 shim array for 3T brain imaging
Publication Title: Magnetic Resonance in Medicine -
Description The cumulative sum of coil array eigenvalues is plotted against the number of principal components in each array's ΔB0 field maps over 50 slices. Plots are normalized to 100% of the total...
Article Title: A 32‐channel combined RF and B0 shim array for 3T brain imaging
Publication Title: Magnetic Resonance in Medicine -
Description Five brain slices in two volunteers are shimmed by optimizing shim currents for a 1‐cm slab around the slice of interest. Slice‐optimized shimming reduces the standard deviation of ΔB0 within each...
Article Title: A 32‐channel combined RF and B0 shim array for 3T brain imaging
Publication Title: Magnetic Resonance in Medicine -
Description Top and bottom halves of coil before and after conversion to a combined RF‐shim array. Four toroidal inductive chokes are used on each element to block RF from the shim current path and/or to...
Article Title: A 32‐channel combined RF and B0 shim array for 3T brain imaging
Publication Title: Magnetic Resonance in Medicine -
Description Diagram of RF‐shim coil element (9.5‐cm diameter) with conventional RF components shown in black. The components in red add shimming functionality to the coil. Toroidal chokes (inset photo at...
Article Title: A 32‐channel combined RF and B0 shim array for 3T brain imaging
Publication Title: Magnetic Resonance in Medicine