R1ρ dispersion over a range of weak locking fields has the potential to reveal information on microvascular geometry and density based on diffusion effects. Using an efficient protocol for data acquisition and theoretical fits to a simple model we present estimates of novel parameters derived from R1ρ dispersion measurements that are in the range expected for microvasculature structure. Our in vivo results support the application of R1ρ dispersion at low locking fields in human studies. However, further validation such as ex vivo studies need to be performed.
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