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    Technical Developments

    Human Knee: In Vivo T1ρ-weighted MR Imaging at 1.5 T—Preliminary Experience

    Published Online:Sep 1 2001https://doi.org/10.1148/radiol.2203001662

    Abstract

    A fast spin-echo sequence weighted with a time constant that defines the magnetic relaxation of spins under the influence of a radio-frequency field (T1ρ) was used in six subjects to measure magnetic resonance (MR) relaxation times in the knee joint with a 1.5-T MR imager. A quantitative comparison of T2- and T1ρ-weighted MR images was also performed. Substantial T1ρ dispersion was demonstrated in human articular cartilage, but muscle did not demonstrate much dispersion. T1ρ-weighted images depicted a chondral lesion with 25% better signal-difference-to-noise ratios than comparable T2-weighted images. This technique may depict cartilage and muscular abnormalities.

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    Article History

    Published in print: Sept 2001