Value of precontrast T1 for dGEMRIC of native articular cartilage |
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Authors: | Wei Li MD Hongyan Du MS Rachel Scheidegger BA Ying Wu MD Pottumarti V Prasad PhD |
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Institution: | 1. Department of Radiology, Evanston Northwestern Healthcare and Northwestern University Feinberg School of Medicine, Evanston, Illinois;2. Center on Outcomes, Research and Education, Evanston Northwestern Healthcare, Evanston, Illinois |
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Abstract: | Purpose To evaluate if the difference between pre‐ and post‐Gd‐DTPA2‐ relaxation rate (ΔR1) provides better differentiation of osteoarthritic patients (OA) from healthy subjects (HS) with dGEMRIC, as compared to post‐Gd‐DTPA2‐ spin‐lattice relaxation time (T1Gd). Materials and Methods Seventeen OA and 14 HS underwent pre‐ and 90 minutes postcontrast (Gd‐DTPA2‐) magnetic resonance imaging (MRI) of the knee, using inversion recovery fast spin‐echo and/or Lock–Locker sequences for T1 mapping. Effect sizes for T1pre, T1Gd, and ΔR1 were calculated, and receiver operating characteristic (ROC) curve and regression analysis were also performed to assess the effectiveness of each parameter in the separation of OA and HS. Results T1Gd and ΔR1 were almost identical in terms of areas under ROC curves (0.903 and 0.914, respectively), and effect sizes (1.34 and 1.31, respectively). These were significantly higher than T1pre. In addition, a high inverse correlation was observed between ΔR1 vs. T1Gd (R = 0.96). Conclusion Either T1Gd or ΔR1 could be used as an index in the evaluation of native cartilage. However, considering the practical logistical cost involved in terms of time and effort to acquire precontrast T1 measurements, our data further support the continued use of T1Gd as the dGEMRIC index in the evaluation of native cartilage. J. Magn. Reson. Imaging 2009;29:494–497. © 2009 Wiley‐Liss, Inc. |
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Keywords: | dGEMRIC articular cartilage T1 mapping relaxation rate osteoarthritis |
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