High-resolution ultrashort echo time (UTE) imaging on human knee with AWSOS sequence at 3.0 T

Authors

  • Yongxian Qian PhD,

    Corresponding author
    1. MR Research Center, Department of Radiology, University of Pittsburgh, Pittsburgh, Pennsylvania, USA
    • 200 Lothrop Street, B804 PUH, Pittsburgh, PA 15213
    Search for more papers by this author
  • Ashley A. Williams MS,

    1. Cartilage Restoration Center, Department of Orthopaedic Surgery, University of Pittsburgh, Pittsburgh, Pennsylvania, USA
    Search for more papers by this author
  • Constance R. Chu MD,

    1. Cartilage Restoration Center, Department of Orthopaedic Surgery, University of Pittsburgh, Pittsburgh, Pennsylvania, USA
    2. Department of Orthopaedic Surgery, University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania, USA
    Search for more papers by this author
  • Fernando E. Boada PhD

    1. MR Research Center, Department of Radiology, University of Pittsburgh, Pittsburgh, Pennsylvania, USA
    2. Department of Bioengineering, University of Pittsburgh, Pittsburgh, Pennsylvania, USA
    Search for more papers by this author

Abstract

Purpose:

To demonstrate the technical feasibility of high-resolution (0.28–0.14 mm) ultrashort echo time (UTE) imaging on human knee at 3T with the acquisition-weighted stack of spirals (AWSOS) sequence.

Materials and Methods:

Nine human subjects were scanned on a 3T MRI scanner with an 8-channel knee coil using the AWSOS sequence and isocenter positioning plus manual shimming.

Results:

High-resolution UTE images were obtained on the subject knees at TE = 0.6 msec with total acquisition time of 5.12 minutes for 60 slices at an in-plane resolution of 0.28 mm and 10.24 minutes for 40 slices at an in-plane resolution of 0.14 mm. Isocenter positioning, manual shimming, and the 8-channel array coil helped minimize image distortion and achieve high signal-to-noise ratio (SNR).

Conclusion:

It is technically feasible on a clinical 3T MRI scanner to perform UTE imaging on human knee at very high spatial resolutions (0.28–0.14 mm) within reasonable scan time (5–10 min) using the AWSOS sequence. J. Magn. Reson. Imaging 2012;35:204-210. © 2011 Wiley Periodicals, Inc.

Ancillary