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Quick water-selective excitation of fast relaxing tissues with 3D UTE sequences

Authors

  • Fabian Springer,

    Corresponding author
    1. Section on Experimental Radiology, Department of Diagnostic and Interventional Radiology, University Hospital Tübingen, Germany
    2. Department of Diagnostic and Interventional Radiology, University Hospital Tübingen, Germany
    • Correspondence to: Fabian Springer, M.D., Section on Experimental Radiology, Department of Diagnostic and Interventional Radiology, Hoppe-Seyler-Str. 3, Tübingen 72076, Germany. E-mail: Fabian.Springer@med.uni-tuebingen.de

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  • Günter Steidle,

    1. Section on Experimental Radiology, Department of Diagnostic and Interventional Radiology, University Hospital Tübingen, Germany
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  • Petros Martirosian,

    1. Section on Experimental Radiology, Department of Diagnostic and Interventional Radiology, University Hospital Tübingen, Germany
    2. Department of Diagnostic and Interventional Radiology, University Hospital Tübingen, Germany
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  • Ulrich Grosse,

    1. Section on Experimental Radiology, Department of Diagnostic and Interventional Radiology, University Hospital Tübingen, Germany
    2. Department of Diagnostic and Interventional Radiology, University Hospital Tübingen, Germany
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  • Roland Syha,

    1. Section on Experimental Radiology, Department of Diagnostic and Interventional Radiology, University Hospital Tübingen, Germany
    2. Department of Diagnostic and Interventional Radiology, University Hospital Tübingen, Germany
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  • Christoph Schabel,

    1. Section on Experimental Radiology, Department of Diagnostic and Interventional Radiology, University Hospital Tübingen, Germany
    2. Department of Diagnostic and Interventional Radiology, University Hospital Tübingen, Germany
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  • Claus D. Claussen,

    1. Department of Diagnostic and Interventional Radiology, University Hospital Tübingen, Germany
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  • Fritz Schick

    1. Section on Experimental Radiology, Department of Diagnostic and Interventional Radiology, University Hospital Tübingen, Germany
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Abstract

Purpose

The aim of this study was to implement a time effective 1-1 double pulse water-selective excitation (WE) into a three-dimensional ultrashort echo time (UTE) sequence (WE-UTE) for visualization of short-T2 tissues with positive contrast and sufficient suppression of surrounding fat.

Methods

First, an analytical description of magnetization components in the steady state applying WE-UTE was derived and results were compared with numerical simulations based on Bloch's equations. Parameters were optimized for best positive contrast between short-T2 tissues and fat under consideration of variable relaxation properties over a broad range. Maximal signal yield and signal efficiency of on-resonant protons were compared with UTE sequences with and without off-resonance fat saturation (FatSat). WE-UTE was exemplarily applied for in-vivo musculoskeletal imaging on a 3T whole-body MR unit.

Results

Steady state magnetization of WE-UTE could be described analytically and showed excellent accordance with numerical simulations. Even for tissues with T2 = 1 ms WE-UTE resulted in 79% of maximal signal yield of UTE without FatSat and was more efficient regarding signal yield if compared with UTE with FatSat. Using WE-UTE in-vivo tendons and ligaments could be well delineated with positive contrast to surrounding fat.

Conclusion

WE-UTE provides a quick method for visualizing short-T2 tissues with positive contrast. Magn Reson Med 71:534–543, 2014. © 2013 Wiley Periodicals, Inc.

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