T1ρ relaxation, known as the spin‐lattice relaxation time in the rotating frame, is sensitive to molecular interactions including dipolar interactions, chemical exchange, and diffusion. T1ρ is often measured by mono-exponential relaxation models. Bi-exponential T1ρ relaxation have been previously observed in muscle, cartilage, menisci and brain. We report our observation of bi-exponential T1ρ relaxation in parotid glands.
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