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Radiofrequency phase encoded half-pulses in simultaneous multislice ultrashort echo time imaging.

Christoph Rettenmeier1, V Andrew Stenger1

  • 1Department of Medicine, John A. Burns School of Medicine, University of Hawaii, Honolulu, Hawaii.

Magnetic Resonance in Medicine
|February 14, 2019
PubMed
Summary

This study introduces a fast simultaneous multislice (SMS) ultrashort echo time (UTE) imaging method. The technique achieves nearly eightfold acceleration, enabling rapid acquisition of multiple UTE images with excellent T2* contrast.

Keywords:
CAIPIPINSSMSUTEhalf-pulsesimultaneous multislice excitationultrashort echo time imaging

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Area of Science:

  • Magnetic Resonance Imaging
  • Medical Physics
  • Radiology

Background:

  • Ultrashort echo time (UTE) imaging is crucial for visualizing tissues with short T2* relaxation times, such as cortical bone.
  • Simultaneous multislice (SMS) imaging accelerates data acquisition by exciting and acquiring multiple slices concurrently.
  • Traditional 2D UTE methods are time-consuming, limiting their clinical applicability.

Purpose of the Study:

  • To develop and validate a novel simultaneous multislice (SMS) ultrashort echo time (UTE) imaging technique.
  • To achieve significant acceleration in UTE imaging, reducing scan times considerably.
  • To generate high-quality, multi-slice UTE images with short T2* contrasts rapidly.

Main Methods:

  • Implementation of radiofrequency phase-encoded half-pulses for SMS excitation (N SMS = 4).
  • Integration of Power Independent of Number of Slices (PINS) inversion recovery (IR) pulses for contrast enhancement.
  • Utilization of coil sensitivity encoding (SENSE) and controlled aliasing in parallel imaging (CAIPI) with a 2D spiral readout.
  • Application of a model-based reconstruction method for image processing.

Main Results:

  • Successful development of an SMS UTE sequence with an undersampling factor of 4.
  • Acquisition of 8 slices with 0.86 mm² resolution in under 3 minutes.
  • Demonstration of highlighted cortical bone signal in head UTE images.
  • Comparable image quality and T2* contrast to single-slice acquisitions, with minor deviations.

Conclusions:

  • The combined radiofrequency phase-encoded SMS half-pulses and PINS IR pulses offer a robust approach for SMS UTE imaging.
  • The method achieves a scan time reduction factor close to 8 through coil sensitivity information and interleaved slice acquisitions.
  • This technique presents a suitable and efficient method for rapid, multi-slice UTE imaging.