biostudies-literatureStockmann JPNIBIB NIH HHSNEI NIH HHSNational Eye InstituteNIMH NIH HHSNational Institute of Mental HealthNational Institute of Biomedical Imaging and BioengineeringNIH HHS1074-1092https://www.ebi.ac.uk/biostudies/studies/S-EPMC9899096biostudies-literatureUnknown87(2)<h4>Purpose</h4>To test an integrated "AC/DC" array approach at 7T, where B₀ inhomogeneity poses an obstacle for functional imaging, diffusion-weighted MRI, MR spectroscopy, and other applications.<h4>Methods</h4>A close-fitting 7T 31-channel (31-ch) brain array was constructed and tested using combined Rx and ΔB₀ shim channels driven by a set of rapidly switchable current amplifiers. The coil was compared to a shape-matched 31-ch reference receive-only array for RF safety, signal-to-noise ratio (SNR), and inter-element noise correlation. We characterize the coil array's ability to provide global and dynamic (slice-optimized) shimming using ΔB₀ field maps and echo planar imaging (EPI) acquisitions.<h4>Results</h4>The SNR and average noise correlation were sMagnetic resonance in medicineA 31-channel integrated "AC/DC" B₀ shim and radiofrequency receive array coil for improved 7T MRI.PMC9899096R21 EB017338R01‐MH111419R00‐EB021349R01 EY030434U01 EB025162K99 EB019482P41‐EB030006R01‐EB006847K99 EB021349U01‐EB025162R01 MH111419R21‐EB017338P41 EB030006R01 EB006847S10 OD023637R00 EB021349R01‐EY030434S10OD023637Mareyam AMilshteyn ENasr SKeil BStockmann JPArango NSSappo CPolimeni JRCraven-Brightman LDavids MHoge WSWhite JKSetsompop KSliwiak MWald LLJenkins LAdalsteinsson EWitzel TZhou JGuerin BfalseA 31-channel integrated "AC/DC" B₀ shim and radiofrequency receive array coil for improved 7T MRI.<h4>Purpose</h4>To test an integrated "AC/DC" array approach at 7T, where B₀ inhomogeneity poses an obstacle for functional imaging, diffusion-weighted MRI, MR spectroscopy, and other applications.<h4>Methods</h4>A close-fitting 7T 31-channel (31-ch) brain array was constructed and tested using combined Rx and ΔB₀ shim channels driven by a set of rapidly switchable current amplifiers. The coil was compared to a shape-matched 31-ch reference receive-only array for RF safety, signal-to-noise ratio (SNR), and inter-element noise correlation. We characterize the coil array's ability to provide global and dynamic (slice-optimized) shimming using ΔB₀ field maps and echo planar imaging (EPI) acquisitions.<h4>Results</h4>The SNR and average noise correlation were s2022-01-01T00:00:00Z2022 Feb2025-04-19T13:28:31.712Z2025-02-19T04:20:50.2ZS-EPMC98990963463262610.1002/mrm.29022