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Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator

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Parallel imaging with phase scrambling.

Maxim Zaitsev¹, Gerrit Schultz, Juergen Hennig

¹Medical Physics, Department of Radiology, University Medical Center Freiburg, Freiburg, Germany.

Magnetic Resonance in Medicine

|April 23, 2014

Summary

This summary is machine-generated.

This study introduces phase scrambling for faster MRI scans, eliminating the need for extra calibration data. This method enables parallel imaging acceleration for improved efficiency in Magnetic Resonance Imaging (MRI).

Keywords:

Fresnel transform parallel imaging phase scrambling quadratic phase

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Area of Science:

Magnetic Resonance Imaging (MRI)
Medical Imaging Physics

Background:

Accelerated parallel imaging in MRI typically requires separate radiofrequency (RF) channel sensitivity profile calibration data.
This data acquisition step increases scan time and complexity.

Purpose of the Study:

To present a novel method for accelerated parallel imaging in MRI that eliminates the need for separate coil calibration data.
To enable faster Magnetic Resonance Imaging (MRI) acquisition using Cartesian trajectories.

Main Methods:

Imparting quadratic phase to the image to spread signals in k-space (phase scrambling).
Reconstructing a low-resolution image from phase-scrambled data using a windowed convolution approach.
Utilizing reconstructed images to derive coil sensitivities for parallel imaging algorithms like SENSE and GRAPPA.

Main Results:

Demonstrated successful phantom imaging with 1x2, 1x3, and 2x2 accelerations.
Validated the method in vivo with 2x2 acceleration using 3D gradient echo acquisition.
Showcased the feasibility of parallel imaging acceleration without dedicated calibration scans.

Conclusions:

Phase scrambling is a viable technique for parallel imaging acceleration in MRI, specifically for 3D Cartesian trajectories.
Further investigation is needed to confirm its applicability across diverse 2D and 3D sampling schemes.