Abstract #5053

Accelerated T1ρ Dispersion Data Acquisition for Correlation Time Mapping of Cartilage at 3T

Stefan Zbyn^1,2,3, Mikko J. Nissi⁴, Hassaan Elsayed^1,2,3, Victor Casula^1,2,3, Matti Hanni^1,2,3, Timo Liimatainen⁵, and Miika T. Nieminen^1,2,3

¹Research Unit of Medical Imaging, Physics and Technology, University of Oulu, Oulu, Finland, ²Medical Research Center, University of Oulu and Oulu University Hospital, Oulu, Finland, ³Department of Diagnostic Radiology, Oulu University Hospital, Oulu, Finland, ⁴Department of Applied Physics, University of Eastern Finland, Kuopio, Finland, ⁵Clinical Imaging Center, Kuopio University Hospital, Kuopio, Finland

Correlation time (τ_c) is novel MRI parameter that can be calculated from time demanding dispersion measurements of longitudinal relaxation times in the rotating frame (T₁ρ). Therefore methods able to accelerate data acquisition are needed for τ_c mapping of cartilage in vivo. Present results demonstrate that partial k-space acquisition and Parallel Imaging can reduce imaging time while having small influence on τ_c values. Although long TurboGRE readout train significantly decreases τ_c values, it allows the τ_c mapping of cartilage in clinically acceptable measurement times. The τ_c mapping may therefore serve for the noninvasive in vivo evaluation of cartilage at 3T.

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