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• W2266240837 abstract "Rotating frame spin–lattice relaxation, with the characteristic time constant T 1ρ , provides a means to access motion‐restricted (slow) spin dynamics in MRI. As a result of their restricted motion, these spins are sometimes characterized by a short transverse relaxation time constant T 2 and thus can be difficult to detect directly with conventional image acquisition techniques. Here, we introduce an approach for three‐dimensional adiabatic T 1ρ mapping based on a magnetization‐prepared sweep imaging with Fourier transformation (MP‐SWIFT) sequence, which captures signal from almost all water spin populations, including the extremely fast relaxing pool. A semi‐analytical procedure for T 1ρ mapping is described. Experiments on phantoms and musculoskeletal tissue specimens (tendon, articular and epiphyseal cartilages) were performed at 9.4 T for both the MP‐SWIFT and fast spin echo (FSE) read outs. In the phantom with liquids having fast molecular tumbling and a single‐valued T 1ρ time constant, the measured T 1ρ values obtained with MP‐SWIFT and FSE were similar. Conversely, in normal musculoskeletal tissues, T 1ρ values measured with MP‐SWIFT were much shorter than the values obtained with FSE. Studies of biological tissue specimens demonstrated that T 1ρ ‐weighted SWIFT provides higher contrast between normal and diseased tissues relative to conventional acquisitions. Adiabatic T 1ρ mapping with SWIFT readout captures contributions from the otherwise undetected fast relaxing spins, allowing more informative T 1ρ measurements of normal and diseased states. Copyright © 2016 John Wiley & Sons, Ltd." @default.
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• W2266240837 date "2016-01-26" @default.
• W2266240837 modified "2023-10-17" @default.
• W2266240837 title "Capturing fast relaxing spins with SWIFT adiabatic rotating frame spin-lattice relaxation (<i>T</i> _1ρ ) mapping" @default.
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• W2266240837 doi "https://doi.org/10.1002/nbm.3474" @default.
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