Korean Journal of Radiology

The Korean Society of Radiology (대한영상의학회)
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Comparison of T1rho and T2 Mapping of Knee Articular Cartilage in an Asymptomatic Population

  • Yoon, Min A (Department of Radiology, Korea University Guro Hospital, Korea University College of Medicine) ;
  • Hong, Suk-Joo (Department of Radiology, Korea University Guro Hospital, Korea University College of Medicine) ;
  • Im, A Lan (Department of Radiology, Korea University Guro Hospital, Korea University College of Medicine) ;
  • Kang, Chang Ho (Department of Radiology, Korea University Anam Hospital, Korea University College of Medicine) ;
  • Kim, Baek Hyun (Department of Radiology, Korea University Ansan Hospital, Korea University College of Medicine) ;
  • Kim, In Seong (Siemens Healthcare)
  • Received : 2016.05.26
  • Accepted : 2016.07.14
  • Published : 2016.11.01
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Abstract

Objective: To analyze subregional differences in T1rho ($T1{\rho}$) and T2 values and their correlation in asymptomatic knee cartilage, and to evaluate angular dependence with magic angles. Materials and Methods: Six asymptomatic volunteers underwent knee MRI with $T1{\rho}$ and T2 mapping. $T1{\rho}$ and T2 values were measured by two radiologists independently, at nine subregions in the medial femoral condyle (MFC) cartilage, at angles of ${\pm}0^{\circ}$, $15^{\circ}$, $35^{\circ}$, $55^{\circ}$, $75^{\circ}$ respective to a vertical line (B0) bisecting the width of the distal femur, and at two locations in the patella. Subregional values of $T1{\rho}$ and T2 were analyzed and significant differences in three divided portions of the MFC (anterior, central, and posterior) were statistically evaluated. Correlation between $T1{\rho}$ and T2 and angular dependence with magic angles were also assessed for statistical significance. Results: $T1{\rho}$ values were lowest at $+15^{\circ}$ and highest at $-55^{\circ}$. T2 values were lowest at $+75^{\circ}$ and highest at $+35^{\circ}$. Both $T1{\rho}$ and T2 were higher in superior patella than inferior patella. $T1{\rho}$ showed significant differences in the three divided portions of the MFC, while T2 showed significant differences only between central and posterior portions. There was a weak correlation between $T1{\rho}$ and T2 (r = 0.217, p = 0.127). $T1{\rho}$ showed more angular dependence than T2. Conclusion: $T1{\rho}$ and T2 showed different subregional values and angular dependence in asymptomatic knee cartilage with a weak correlation. Awareness of these differences will aid in assessment of cartilage in a specific subregion of the knee.

Keywords

References

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