T2 star relaxation times for assessment of articular cartilage at 3 T: A feasibility study

Tallal Charles Mamisch, Timothy Hughes, Timothy Mosher, Christoph Mueller, Siegfried Trattnig, Chris Boesch, Goetz Hannes Welsch

Research output: Contribution to journalArticlepeer-review

98 Scopus citations

Abstract

Purpose T2 mapping techniques use the relaxation constant as an indirect marker of cartilage structure, and the relaxation constant has also been shown to be a sensitive parameter for cartilage evaluation. As a possible additional robust biomarker, T2* relaxation time is a potential, clinically feasible parameter for the biochemical evaluation of articular cartilage. Materials and methods The knees of 15 healthy volunteers and 15 patients after microfracture therapy (MFX) were evaluated with a multi-echo spin-echo T2 mapping technique and a multi-echo gradient-echo T2* mapping sequence at 3.0 TeslaMRI. Inline maps, using a log-linear least squares fitting method, were assessed with respect to the zonal dependency of T2 and T2* relaxation for the deep and superficial regions of healthy articular cartilage and cartilage repair tissue. Results There was a statistically significant correlation between T2 and T2* values. Both parameters demonstrated similar spatial dependency, with longer values measured toward the articular surface for healthy articular cartilage. No spatial variation was observed for cartilage repair tissue after MFX. Conclusions Within this feasibility study, both T2 and T2* relaxation parameters demonstrated a similar response in the assessment of articular cartilage and cartilage repair tissue. The potential advantages of T2*-mapping of cartilage include faster imaging times and the opportunity for 3D acquisitions, thereby providing greater spatial resolution and complete coverage of the articular surface.

Original languageEnglish (US)
Pages (from-to)287-292
Number of pages6
JournalSkeletal Radiology
Volume41
Issue number3
DOIs
StatePublished - Jan 1 2012

All Science Journal Classification (ASJC) codes

  • Radiology Nuclear Medicine and imaging

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