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NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences01:17

NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences

A pulse is a short burst of radio waves distributed over a range of frequencies that simultaneously excites all the nuclei in the sample. Upon passing a radio frequency pulse along the x-axis, the nuclei absorb energy corresponding to their Larmor frequencies and achieve resonance. This shifts the net magnetization vector from the z-axis toward the transverse plane. This angle of rotation of the magnetization vector, or the flip angle, is proportional to the duration and intensity of the pulse.
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Simultaneous brain and neck time-of-flight MRA using spiral multiband with localized quadratic encoding.

Xi Peng1,2, Dinghui Wang1, Daniel Borup3

  • 1Department of Radiology, Mayo Clinic, Rochester, Minnesota, USA.

Magnetic Resonance in Medicine
|April 5, 2024
PubMed
Summary
This summary is machine-generated.

This study introduces a fast magnetic resonance angiography (MRA) technique for simultaneous brain and neck imaging. The novel method significantly reduces scan time and venous signal contamination for clearer artery visualization.

Keywords:
localized quadratic RF pulsespartial‐Fourier slice selectionspiral multibandtime‐of‐flight MRA

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Area of Science:

  • Medical Imaging
  • Radiology
  • Neuroimaging

Background:

  • Time-of-flight magnetic resonance angiography (ToF-MRA) is crucial for visualizing blood vessels.
  • Simultaneous brain and neck MRA is challenging due to time constraints and potential signal interferences.

Purpose of the Study:

  • To develop an efficient method for simultaneous brain and neck ToF-MRA.
  • To achieve this within practical scan timeframes.

Main Methods:

  • A spiral multiband (MB) localized quadratic (LQ) encoding method was proposed.
  • Tilt-optimized non-saturated excitation (TONE) and partial-Fourier slice selection (PFSS) were integrated to reduce venous signal contamination.
  • A sequential spiral MB and LQ reconstruction pipeline was utilized.

Main Results:

  • Simultaneous brain and neck ToF-MRA was achieved in 2 minutes and 50 seconds.
  • The MB and LQ acquisitions enhanced SNR-efficiency, allowing for greater spatial coverage without compromising scan time or SNR.
  • TONE and PFSS effectively minimized venous contamination and improved sensitivity to small vessels.

Conclusions:

  • A novel MB spiral LQ approach enables rapid intracranial and carotid ToF-MRA with reduced venous interference.
  • This method shows significant promise for MRA applications requiring extensive spatial coverage.