[Joint correction for motion artifacts and off-resonance artifacts in multi-shot diffusion magnetic resonance...

Area of Science:

• Medical Imaging
• Biophysics
• Signal Processing

Background:

• Multi-shot diffusion MRI is prone to motion and off-resonance artifacts, degrading image quality.
• Existing correction methods often require additional data acquisition or are limited in scope.

Purpose of the Study:

• To develop a simultaneous correction method for motion and off-resonance artifacts in multi-shot diffusion MRI.
• To avoid increasing acquisition time or needing navigation data and field maps.

Main Methods:

• A joint correction method was proposed and applied using a multi-shot variable density spiral sequence.
• Auto-focusing for deblurring and direct/iterative methods for motion-induced phase errors were employed.
• The method corrects artifacts without additional navigation data or field map acquisition.

Main Results:

• In vivo experiments demonstrated effective suppression of motion and off-resonance artifacts.
• The method achieved high-resolution images with fine structural details.
• No increase in overall scan time was observed.

Conclusions:

• The proposed joint correction method is efficient for simultaneous artifact removal in multi-shot diffusion MRI.
• It improves image quality and preserves fine structures without compromising scan efficiency.
• This technique offers a valuable advancement for diffusion MRI applications.