Herr Felix L, Hohmann Natascha, Dascalescu Christian, Hoppe Boj, Gildein Hannah, Schäfer Verena, Ricke Jens, Holzapfel Boris M, Schröder Lennart, Hesse Nina, Arnholdt Jörg, Reidler Paul
Department of Radiology, University Hospital, LMU Munich, Munich, Germany.
Department of Orthopaedics and Trauma Surgery, Orthopaedic Oncology, Musculoskeletal University Center Munich (MUM), University Hospital, LMU Munich, Munich, Germany.
Eur Radiol Exp. 2025 Sep 9;9(1):87. doi: 10.1186/s41747-025-00631-9.
Computed tomography (CT) and magnetic resonance imaging (MRI) are commonly used to assess femoral and tibial torsion. While CT offers high spatial resolution, it involves ionizing radiation. MRI avoids radiation but requires multiple sequences and extended acquisition time. We retrospectively evaluated whether a three-dimensional isotropic MRI localizer (FastView) could serve as a reliable and faster alternative. In this retrospective single-center study, 60 lower limbs from 30 patients, aged 27.1 ± 11.5 years (mean ± standard deviation), 19 females and 11 males, were assessed using both FastView and a dedicated MRI protocol. FastView (5 × 5 × 5 mm voxels) imaged the entire lower limb in 17.4 s compared to nearly 7 min for the dedicated protocol. Torsion angles were measured independently by two readers. Agreement between methods was evaluated using intraclass correlation coefficients (ICCs), Bland-Altman plots, and Pearson R². No significant differences in torsion values were found (all p > 0.305). Femoral (ICC: 0.91-0.96) and tibial (ICC: 0.91-0.94) torsion showed excellent inter-modality agreement. Inter-reader reliability was also high (ICC: 0.95-0.99). Correlation values confirmed strong agreement (R²: 0.891-0.963). FastView demonstrated accuracy comparable to the dedicated protocol, offering a fast, efficient, and radiation-free option for routine torsion assessment. RELEVANCE STATEMENT: FastView MRI localizer offers a fast and resource-efficient method for assessing lower limb torsion, potentially replacing standard multisequence protocols in routine clinical practice. KEY POINTS: FastView MRI enables lower limb torsion measurements with full-limb coverage in under 20 s. Torsion angles from FastView and dedicated MRI showed no significant differences. Femoral and tibial ICCs between 0.91 and 0.96 confirm excellent inter-protocol agreement. Inter-reader agreement was consistently high across both protocols. FastView may replace multisequence MRI protocols in routine clinical torsion assessment.
计算机断层扫描（CT）和磁共振成像（MRI）常用于评估股骨和胫骨扭转。虽然CT具有高空间分辨率，但它涉及电离辐射。MRI避免了辐射，但需要多个序列和较长的采集时间。我们回顾性评估了三维各向同性MRI定位器（FastView）是否可以作为一种可靠且更快的替代方法。在这项回顾性单中心研究中，对30例患者的60条下肢进行了评估，患者年龄为27.1±11.5岁（均值±标准差），其中女性19例，男性11例，同时使用FastView和专门的MRI方案进行检查。FastView（体素大小为5×5×5毫米）对整个下肢成像用时17.4秒，而专门方案用时近7分钟。由两名阅片者独立测量扭转角度。使用组内相关系数（ICC）、Bland-Altman图和Pearson R²评估两种方法之间的一致性。未发现扭转值有显著差异（所有p>0.305）。股骨（ICC：0.91 - 0.96）和胫骨（ICC：0.91 - 0.94）扭转显示出极好的模态间一致性。阅片者间的可靠性也很高（ICC：0.95 - 0.99）。相关值证实了高度一致性（R²：0.891 - 0.963）。FastView显示出与专门方案相当的准确性，为常规扭转评估提供了一种快速、高效且无辐射的选择。相关声明：FastView MRI定位器为评估下肢扭转提供了一种快速且资源高效的方法，有可能在常规临床实践中取代标准的多序列方案。关键点：FastView MRI能够在20秒内对下肢进行全肢覆盖的扭转测量。FastView和专门MRI测量的扭转角度无显著差异。股骨和胫骨的ICC在0.91至0.96之间，证实了方案间的极好一致性。两种方案的阅片者间一致性始终很高。FastView可能在常规临床扭转评估中取代多序列MRI方案。
