{"doi":"10.1002/mrm.28935","title":"Dual flip‐angle IR‐FLASH with spin history mapping for B1+ corrected T1 mapping: Application to T1 cardiovascular magnetic resonance multitasking","abstract":"Purpose To develop a single‐scan method for ‐corrected T 1 mapping and apply it for free‐breathing (FB) cardiac MR multitasking without electrocardiogram (ECG) triggering. Methods One dual flip‐angle (2FA) inversion recovery (IR)‐FLASH scan provides two observations of (apparent T 1 ) corresponding to two distinct combinations of the nominal FA α and . Spatiotemporally coregistered T 1 and spin history maps are obtained by fitting the 2FA signal model. T 1 estimate accuracy and repeatability for single flip‐angle (1FA) and 2FA IR‐FLASH sequence MR multitasking were evaluated at 3T. A T 1 phantom was first imaged on the scanner table, then on two human subjects’ thoraxes in both breath‐hold (BH) and FB conditions. IR‐turbo spin echo (IR‐TSE) static phantom T 1 measurements served as reference. In 10 healthy subjects, myocardial T 1 was evaluated with ECG‐free, FB multitasking sequences alongside ECG‐triggered BH MOLLI. Results For phantom‐on‐table T 1 estimates, 2FA agreed better with IR‐TSE (intraclass correlation coefficient [ICC] = 0.996, mean error ± SD = −1.6% ± 1.9%) than did 1FA (ICC = 0.922; mean error ± SD = −4.3% ± 12%). For phantom‐on‐thorax, 2FA was more repeatable and robust to respiration than 1FA (coefficient of variation [CoV] = 1.2% 2FA, = 11.3% 1FA). In vivo, in intrasession T 1 repeatability, 2FA (septal CoV = 2.4%, six‐segment CoV = 4.4%) outperformed 1FA (septal CoV = 3.1%, six‐segment CoV = 5.5%). In six‐segment T 1 homogeneity, 2FA (CoV = 7.9%) also outperformed 1FA (CoV = 11.1%). Conclusion The 2FA IR‐FLASH improves T 1 estimate accuracy and repeatability over 1FA IR‐FLASH, and enables single‐scan ‐corrected T 1 mapping without BHs or ECG when used with MR multitasking.","journal":"Magnetic Resonance in Medicine","year":2021,"id":197188,"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":16,"citer_count":0,"citers_with_citation_signal":0,"citers_with_endowment":0,"datacite_reuse_total":0,"is_dataset":false,"is_dataset_confidence":0.9491,"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":481588,"name":"Sen Ma","orcid":"0000-0001-9715-7706","position":1,"is_corresponding":false},{"id":770528,"name":"Xianglun Mao","orcid":"0000-0002-2745-7444","position":2,"is_corresponding":false},{"id":383640,"name":"Fei Han","orcid":"0000-0002-1598-9048","position":3,"is_corresponding":false},{"id":463629,"name":"Yibin Xie","orcid":"0000-0002-0333-567X","position":4,"is_corresponding":false},{"id":604766,"name":"Hui Han","orcid":"0000-0002-8890-4295","position":5,"is_corresponding":false},{"id":289229,"name":"Debiao Li","orcid":"0000-0001-8560-8231","position":6,"is_corresponding":false},{"id":383636,"name":"Anthony Christodoulou","orcid":"0000-0002-9334-8684","position":7,"is_corresponding":false},{"id":770527,"name":"Fardad Michael Serry","orcid":"0000-0002-9168-8765","position":0,"is_corresponding":true}],"reference_count":32,"raw_metadata":null,"created_at":"2026-07-18T23:50:19.568641Z","pmid":"34309072","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":[]}