{"doi":"10.1002/mrm.28771","title":"Dual polarity encoded MRI using high bandwidth radiofrequency pulses for robust imaging with large field inhomogeneity","abstract":"Purpose The ability to use dual polarity encoded MRI with the missing pulse steady‐state free precession (MP‐SSFP) sequence is demonstrated to perform robust MRI with low radiofrequency (RF) amplitude, where the field is distorted by embedding metallic screws in an agar phantom. Image‐based estimation of the 3D ΔB 0 map and image distortion correction is shown to require ~1 minute to perform. Theory and methods Dual polarity encoded MP‐SSFP was implemented at 1.5T and used to image agar phantoms with one stainless steel and one titanium screw embedded inside. A multispectral fast spin‐echo acquisition was performed for comparison. Self‐consistent ΔB 0 estimation is performed iteratively using a 3D B‐spline basis, which is compared to the ΔB 0 estimate generated by the multispectral sequence. Results Dual polarity encoded MP‐SSFP yields image quality similar to the multispectral sequence used with substantially less imaging time, provided the MP‐SSFP experimental parameters are chosen well. The multispectral sequence appears to visualize modestly closer in proximity to the metallic screws used, despite the spectral bins covering the same bandwidth as the pulses used in MP‐SSFP. However, MP‐SSFP avoids ripple artifacts characteristic of the multispectral sequence. The ΔB 0 estimate generated by MP‐SSFP is qualitatively similar to that generated by the multispectral sequence but larger in magnitude. Conclusion Despite longer processing time compared to multispectral imaging, MP‐SSFP yields similar image quality with significantly lower acquisition times in the absence of parallel imaging. The work herein demonstrates the ability to perform 3D ΔB 0 estimation and image correction within a reasonable amount of time, ~1 minute.","journal":"Magnetic Resonance in Medicine","year":2021,"id":207379,"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":4,"citer_count":0,"citers_with_citation_signal":0,"citers_with_endowment":0,"datacite_reuse_total":0,"is_dataset":false,"is_dataset_confidence":0.9536,"is_data_producer":false,"deposit_databanks":null,"is_oa":false,"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":281629,"name":"Michael Garwood","orcid":"0000-0003-1578-9166","position":1,"is_corresponding":false},{"id":385459,"name":"Michael Mullen","orcid":"0000-0002-7071-6413","position":0,"is_corresponding":true}],"reference_count":62,"raw_metadata":null,"created_at":"2026-07-18T23:51:49.715594Z","pmid":"33780035","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":[]}