Pole-To-Pole 3D Radial Trajectory Designs Improve Image Quality and Quantitative Parametric Mapping in the Brain and...

Area of Science:

• Magnetic Resonance Imaging (MRI)
• Medical Imaging Physics
• Biomedical Engineering

Background:

• Phase inconsistencies in 3D radial k-space acquisition can degrade image quality and parametric mapping accuracy.
• Traditional radial trajectories may exhibit variations in k-space center phase, impacting quantitative results.

Purpose of the Study:

• To design novel 3D radial spiral phyllotaxis trajectories for improved MRI.
• Aiming to eliminate phase inconsistencies and enhance parametric mapping accuracy.
• Enhance overall image quality in 3D radial MRI acquisitions.

Main Methods:

• Developed and implemented two 3D radial trajectories: pole-to-pole and continuous spiral phyllotaxis.
• Evaluated image quality and k-space center phase variations in phantoms and human brains.
• Compared T1/T2 quantification accuracy against original and Cartesian trajectories.

Main Results:

• Both new trajectories improved image quality compared to the original radial design.
• New trajectories demonstrated reduced T1/T2 estimation errors.
• Enhanced T1/T2 maps and cardiac image quality were observed with the new designs.

Conclusions:

• Acquiring nearly opposing spokes in 3D radial designs effectively compensates for phase inconsistencies.
• This approach improves quantitative imaging and anatomical visualization without additional correction sequences.
• Novel phyllotaxis trajectories offer significant advantages for MRI applications.