3D-T quantitation of patellar cartilage at 3.0T

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PurposeTo demonstrate the feasibility of three-dimensional (3D) T-weighted imaging of human knee joint at 3.0T without exceeding the specific absorption rate (SAR) limits and the measurement of the baseline T values of patellar cartilage and several muscles at the knee joint.Materials and Methods3D gradient-echo sequence with a self-compensating spin-lock pulse cluster of 250 Hz power was used to acquire 3D-T-weighted images of the knee joint of five healthy subjects. Global and regional analysis of patellar cartilage T were performed. Furthermore, T of several periarticular muscles were analyzed.ResultsThe global average T value of the patellar cartilage varied from 39 to 43 msec. The regional average T values varied from 38 to 42 msec, and from 42 to 44 msec for medial and lateral facets, respectively. In vivo reproducibility of average T of patellar cartilage was found to be 5% (coefficient of variation). Similarly, the global average T values for biceps femoris, lateral gastrocnemius, medial gastrocnemius, and sartorius varied between 31–46, 29–49, 35–48, and 32–50 msec, respectively.ConclusionWe demonstrated the feasibility of 3D-T-weighted imaging of the knee joint at 3.0T without exceeding SAR limits.

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