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Quantitative Magnetic Resonance Imaging of Skeletal Muscle Disease
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Rapid slice excitation without B0 gradients using large array coils.

Ke Feng1, Steven M Wright1

  • 11 Department of Electrical and Computer Engineering, 2 Department of Biomedical Engineering, Texas A&M University, College Station, TX 77843, USA ; 3 Department of Radiology, Texas A&M Health Science Center, Bryan, TX 77807, USA.

Quantitative Imaging in Medicine and Surgery
|May 17, 2014
PubMed
Summary
This summary is machine-generated.

Controlling phase and power in transmit phased arrays allows flexible slice thickness and positioning for MRI. This technique enables curved slice excitation without complex radiofrequency pulses, improving imaging efficiency.

Keywords:
MRIcurved slicesingle echo acquisitionslice excitationtransmit array

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Area of Science:

  • Magnetic Resonance Imaging (MRI)
  • Radiofrequency (RF) Engineering
  • Medical Physics

Background:

  • Transmit phased arrays are crucial for advanced MRI techniques.
  • Precise control over RF excitation patterns is essential for optimizing image quality and speed.
  • Current methods for complex slice excitation often involve intricate RF pulse sequences.

Purpose of the Study:

  • To investigate a novel method for controlling transmit slice thickness and position in MRI.
  • To demonstrate the capability of generating curved slice excitations using simple adjustments to phased array parameters.
  • To validate simulation predictions with experimental MRI data.

Main Methods:

  • Simulations utilizing the Biot-Savart law to model the effects of phase shifts and power variations in a planar pair phased array.
  • Design and construction of planar and cylindrical planar pair coil arrays.
  • Experimental testing of the fabricated arrays on an MRI scanner.

Main Results:

  • Phase shift control effectively alters transmit slice thickness.
  • Power level variation influences slice positioning (depth into the subject).
  • Curved slice excitation patterns were successfully achieved and validated against simulations and MRI images.

Conclusions:

  • Simple adjustments to phase and power in transmit phased arrays offer a versatile method for slice excitation control.
  • This technique eliminates the need for complex multi-dimensional RF pulses, simplifying sequence design.
  • The method shows promise for applications in rapid or ultra-short echo time MRI sequences.