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@antjehellwich.bsky.social Sep 8, 2026, 6:10 AM

🦴🧲 Radial UTE #MRI in Musculoskeletal Diseases by Dr. Yun Sun Choi, et al. (Nowon Eulji Medical Center, Eulji University, Seoul, Korea)

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#RadSky #MSK #BoneImaging

$MRI is the modality of choice for evaluating most soft-tissue structures in the musculoskeletal system because of its excellent soft-tissue contrast and lack of ionizing radiation. However, conventional MRI sequences typically use echo times longer than one millisecond and therefore fail to capture signal from tissues with ultrashort transverse relaxation times, such as cortical bone, calcified cartilage, fibrocartilage, the deep or enthesial portions of tendons and ligaments, and cartilaginous endplate at the discovertebral junction. Because these short-T2 tissues are frequently involved in musculoskeletal disease, conventional MRI leaves a diagnostic gap that has traditionally been addressed by radiography or CT. 3D radial ultrashort echo time (UTE)* MRI helps bridge this gap by sampling the free induction decay within tens of microseconds after nonselective excitation, using a center-out radial k-space trajectory. This technique enables visualization of tissues that are normally signal-void on conventional MRI, and can provide CT-like contrast for cortical bone and mineralized tissue while preserving the soft-tissue advantages of MRI. UTE MRI can complement standard MRI in the evaluation of bone morphology, fractures, focal bone lesions, joint disease, soft-tissue calcification or ossification, and postoperative changes. At present, radial UTE MRI is best regarded as a powerful adjunct to, rather than a replacement for, CT or conventional MRI. Its clinical role is partially limited by longer acquisition times, sequence-specific artifacts, the magic-angle effect, and lower spatial resolution compared with CT. Nevertheless, continuing advances in acquisition and reconstruction are likely to expand the role of radial UTE MRI in comprehensive, radiation-free musculoskeletal imaging. Shoutout to the co-authors: Stefan Sommer, Ph.D. and Jaekon Sung (Siemens Healthineers)$

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