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Spatial phase encoding exploiting the Bloch-Siegert shift effect.

Ralf Kartäusch1, Toni Driessle, Thomas Kampf

  • 1Department of Experimental Physics 5, University of Würzburg, Am Hubland, 97074, Würzburg, Germany, ralf.kartaeusch@physik.uni-wuerzburg.de.

Magma (New York, N.Y.)
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Summary
This summary is machine-generated.

This study introduces Bloch-Siegert spatial encoding (BS-SET) using radiofrequency gradients as an alternative to conventional MRI phase encoding. Adapted reconstruction methods enable undistorted 2D spin echo imaging with BS-SET.

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Area of Science:

  • Magnetic Resonance Imaging (MRI)
  • Pulse Sequence Design
  • Image Reconstruction

Background:

  • Conventional MRI relies on B0-gradient spatial phase encoding.
  • Bloch-Siegert (BS) phase shifts, induced by off-resonant RF pulses, are typically used for B1(+) mapping.
  • This work explores BS phase shifts for spatial encoding.

Purpose of the Study:

  • To introduce and theoretically describe the Bloch-Siegert spatial encoding technique (BS-SET) using RF-gradients.
  • To develop an adapted image reconstruction method for BS-SET due to its nonlinear encoding.
  • To demonstrate the feasibility of BS-SET as an alternative to conventional spatial phase encoding.

Main Methods:

  • Developed BS-SET utilizing far off-resonant radiofrequency (RF) pulses to induce spatially dependent phase shifts.
  • Implemented BS-SET in a 2D spin echo (SE) sequence on a 0.5 T portable MR scanner.
  • Created an adapted reconstruction algorithm to address the nonlinear encoding inherent in BS-gradients.

Main Results:

  • A 2D SE measurement using BS-SET was performed and compared to conventional 2D SE.
  • The adapted reconstruction method successfully yielded undistorted images.
  • BS-gradients proved effective for spatial phase encoding in the tested configuration.

Conclusions:

  • Bloch-Siegert gradients are a viable alternative for spatial phase encoding in MRI.
  • Undistorted 2D images can be acquired using the BS-SET with the proposed reconstruction method.
  • This technique offers a novel approach to spatial encoding in MRI systems.