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Ghost artifact cancellation using phased array processing.

P Kellman¹, E R McVeigh

¹Laboratory of Cardiac Energetics, National Institutes of Health, National Heart, Lung and Blood Institute, Bethesda, Maryland 20892-1061, USA. kellman@nih.gov

Magnetic Resonance in Medicine

|July 31, 2001

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This study introduces a new phased array combining method to eliminate ghosting artifacts in MRI scans. The technique optimizes signal-to-noise ratio while canceling distortions for clearer imaging, particularly in cardiac applications.

Area of Science:

Magnetic Resonance Imaging (MRI)
Signal Processing
Medical Imaging Technology

Background:

Ghosting artifacts in MRI, caused by distortions like local flow and off-resonance, degrade image quality.
Conventional methods for artifact reduction in echo-planar imaging (EPI) have limitations.

Purpose of the Study:

To develop and validate a novel phased array combining method for ghost artifact cancellation in full field-of-view (FOV) MRI.
To improve image quality by optimizing signal-to-noise ratio (SNR) under ghosting constraints.

Main Methods:

Formulation of a constrained optimization technique for phased array combining.
Application of the method to multishot EPI with non-interleaved phase encode acquisition.
Comparison with sensitivity encoding (SENSE) principles for accelerated imaging.

Related Experiment Videos

Main Results:

Successful cancellation of ghost artifacts caused by space-variant distortions (local flow, off-resonance).
Demonstrated reduction in distortion compared to conventional interleaved EPI acquisition.
Elimination of the need for echo-shifting, simplifying acquisition.

Conclusions:

The proposed phased array combining method effectively cancels ghost artifacts in MRI.
The technique offers significant advantages for multishot EPI, including reduced distortion and improved SNR.
Validated through phantom and cardiac imaging experiments.