{"doi":"10.1002/nbm.4322","title":"Magic angle effect on adiabatic T<sub>1ρ</sub> imaging of the Achilles tendon using 3D ultrashort echo time cones trajectory","abstract":"The protons in collagen‐rich musculoskeletal (MSK) tissues such as the Achilles tendon are subject to strong dipolar interactions which are modulated by the term (3cos 2 θ‐1) where θ is the angle between the fiber orientation and the static magnetic field B 0 . The purpose of this study was to investigate the magic angle effect in three‐dimensional ultrashort echo time Cones Adiabatic T 1ρ (3D UTE Cones‐AdiabT 1ρ ) imaging of the Achilles tendon using a clinical 3 T scanner. The magic angle effect was investigated by Cones‐AdiabT 1ρ imaging of five cadaveric human Achilles tendon samples at five angular orientations ranging from 0° to 90° relative to the B 0 field. Conventional Cones continuous wave T 1ρ (Cones‐CW‐T 1ρ ) and Cones T 2 * (Cones‐T 2 *) sequences were also applied for comparison. On average, Cones‐AdiabT 1ρ increased 3.6‐fold from 13.6 ± 1.5 ms at 0° to 48.4 ± 5.4 ms at 55°, Cones‐CW‐T 1ρ increased 6.1‐fold from 7.0 ± 1.1 ms at 0° to 42.6 ± 5.2 ms at 55°, and Cones‐T2* increased 12.3‐fold from 2.9 ± 0.5 ms at 0° to 35.8 ± 6.4 ms at 55°. Although Cones‐AdiabT 1ρ is still subject to significant angular dependence, it shows a much‐reduced magic angle effect compared to Cones‐CW‐T 1ρ and Cones‐T 2 *, and may be used as a novel and potentially more effective approach for quantitative evaluation of the Achilles tendon and other MSK tissues.","journal":"NMR in Biomedicine","year":2020,"id":100708,"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":28,"citer_count":0,"citers_with_citation_signal":0,"citers_with_endowment":0,"datacite_reuse_total":0,"is_dataset":false,"is_dataset_confidence":0.9526,"is_data_producer":false,"deposit_databanks":null,"is_oa":true,"file_count":0,"downloads":0,"has_version_chain":false,"published_date":"2020-01-01","fair_score":null,"fair_percentile":null,"algorithm_id":"datarank_citation_only_1hop_v6","ranking_scope":"data_only","authors":[{"id":310553,"name":"Yajun Ma","orcid":"0000-0003-0830-9232","position":1,"is_corresponding":false},{"id":426030,"name":"Lidi Wan","orcid":"0000-0001-6851-4583","position":2,"is_corresponding":false},{"id":310555,"name":"Saeed Jerban","orcid":"0000-0001-6450-2892","position":3,"is_corresponding":false},{"id":315308,"name":"Hyungseok Jang","orcid":"0000-0002-3597-9525","position":4,"is_corresponding":false},{"id":310559,"name":"Eric Y. Chang","orcid":"0000-0003-3633-5630","position":5,"is_corresponding":false},{"id":310558,"name":"Jiang Du","orcid":"0000-0002-9203-2450","position":6,"is_corresponding":false},{"id":371572,"name":"Mei Wu","orcid":"0000-0003-0952-5973","position":0,"is_corresponding":true}],"reference_count":41,"raw_metadata":null,"created_at":"2026-07-18T22:39:01.863288Z","pmid":"32431025","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":[]}