{"doi":"10.1002/mrm.29022","title":"A 31‐channel integrated “AC/DC” B<sub>0</sub> shim and radiofrequency receive array coil for improved 7T MRI","abstract":"Purpose To test an integrated “AC/DC” array approach at 7T, where B 0 inhomogeneity poses an obstacle for functional imaging, diffusion‐weighted MRI, MR spectroscopy, and other applications. Methods A close‐fitting 7T 31‐channel (31‐ch) brain array was constructed and tested using combined Rx and ΔB 0 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 ΔB 0 field maps and echo planar imaging (EPI) acquisitions. Results The SNR and average noise correlation were similar to the 31‐ch reference array. Global and slice‐optimized shimming provide 11% and 40% improvements respectively compared to baseline second‐order spherical harmonic shimming. Birdcage transmit coil efficiency was similar for the reference and AC/DC array setups. Conclusion Adding ΔB 0 shim capability to a 31‐ch 7T receive array can significantly boost 7T brain B 0 homogeneity without sacrificing the array’s rdiofrequency performance, potentially improving ultra‐high field neuroimaging applications that are vulnerable to off‐resonance effects.","journal":"Magnetic Resonance in Medicine","year":2021,"id":171196,"datarank":0.0,"base_score":0.0,"endowment":0.0,"self_citation_contribution":0.0,"citation_network_contribution":0.0,"self_endowment_contribution":0.0,"citer_contribution":0.0,"corpus_percentile":null,"corpus_rank":null,"citation_count":27,"citer_count":0,"citers_with_citation_signal":0,"citers_with_endowment":0,"datacite_reuse_total":0,"is_dataset":false,"is_dataset_confidence":0.9553,"is_data_producer":false,"deposit_databanks":null,"is_oa":true,"file_count":0,"downloads":0,"has_version_chain":false,"published_date":"2021-01-01","fair_score":null,"fair_percentile":null,"algorithm_id":"datarank_citation_only_1hop_v6","ranking_scope":"data_only","authors":[{"id":410064,"name":"Nicolas Arango","orcid":"0000-0001-9877-3092","position":1,"is_corresponding":false},{"id":263268,"name":"Thomas Witzel","orcid":"0000-0002-5806-4897","position":2,"is_corresponding":false},{"id":597570,"name":"Azma Mareyam","orcid":"0000-0002-2893-7386","position":3,"is_corresponding":false},{"id":241414,"name":"Charlotte R. Sappo","orcid":"0000-0002-7030-278X","position":4,"is_corresponding":false},{"id":705147,"name":"Jiazheng Zhou","orcid":"0000-0002-7114-5181","position":5,"is_corresponding":false},{"id":705765,"name":"Lucas J. Jenkins","orcid":null,"position":6,"is_corresponding":false},{"id":705766,"name":"Lincoln Craven‐Brightman","orcid":null,"position":7,"is_corresponding":false},{"id":422374,"name":"Eugene Milshteyn","orcid":"0000-0003-0213-7003","position":8,"is_corresponding":false},{"id":624235,"name":"Mathias Davids","orcid":"0000-0003-0217-9123","position":9,"is_corresponding":false},{"id":388280,"name":"W. Scott Hoge","orcid":"0000-0003-0944-2350","position":10,"is_corresponding":false},{"id":241413,"name":"Monika Śliwiak","orcid":"0000-0001-9358-9632","position":11,"is_corresponding":false},{"id":424582,"name":"Shahin Nasr","orcid":"0000-0002-7546-9976","position":12,"is_corresponding":false},{"id":492626,"name":"Boris Keil","orcid":"0000-0003-0805-8330","position":13,"is_corresponding":false},{"id":344037,"name":"Elfar Adalsteinsson","orcid":"0000-0002-7637-2914","position":14,"is_corresponding":false},{"id":241415,"name":"Bastien Guérin","orcid":"0000-0002-4746-0886","position":15,"is_corresponding":false},{"id":580870,"name":"Jacob K. White","orcid":null,"position":16,"is_corresponding":false},{"id":263269,"name":"Kawin Setsompop","orcid":"0000-0003-0455-7634","position":17,"is_corresponding":false},{"id":30837,"name":"Jon̈athan R. Polimeni","orcid":"0000-0002-1348-1179","position":18,"is_corresponding":false},{"id":241418,"name":"Lawrence L. Wald","orcid":"0000-0001-8278-6307","position":19,"is_corresponding":false},{"id":241410,"name":"Jason Stockmann","orcid":"0000-0001-8454-5347","position":0,"is_corresponding":true}],"reference_count":49,"raw_metadata":null,"created_at":"2026-07-18T23:46:28.747384Z","pmid":"34632626","pmcid":null,"fwci":null,"citation_percentile":null,"influential_citations":0,"oa_status":null,"license":null,"views":0,"total_file_size_bytes":0,"version_count":0,"fair_f":null,"fair_a":null,"fair_i":null,"fair_r":null,"fair_zscore":null,"fair_rationale":null,"fair_model":null,"fair_agent_version":null,"fair_fulltext_source":null,"fair_has_llm":null,"fair_computed_at":null,"clinical_trials":[],"software_tools":[],"db_accessions":[],"linked_datasets":[],"topics":[]}