Fast Prospective Motion Correction for MRI Based on Electromagnetic Induction Coils with Low Footprint and In-place...

Area of Science:

• Medical Imaging
• Biomedical Engineering
• Magnetic Resonance Imaging

Background:

• Prospective motion correction (PMC) is crucial for maintaining image quality in MRI, especially for fast sequences.
• Existing methods like fat navigator (FatNav) have limitations in temporal resolution and accuracy.
• Developing novel motion tracking systems is essential for improving MRI performance.

Purpose of the Study:

• To develop an electromagnetic induction coil (EMIC)-based motion tracking system for high-temporal-resolution PMC.
• To enable in-place calibration and a low footprint for the EMIC system.
• To improve prospective motion correction (PMC) for short-repetition time (TR) MRI sequences.

Main Methods:

• Designed an MR-visible electromagnetic induction coil (EMIC) with in-place calibration capabilities.
• Implemented flexible coil distribution for adaptable placement.
• Compared EMIC-based PMC with fat navigator (FatNav)-based PMC for 2D phase contrast MRI (PC-MRI) under identical motion conditions.

Main Results:

• EMIC achieved a 10-fold increase in motion tracking temporal resolution compared to FatNav.
• Demonstrated high sensitivity to minor movements, with low random errors (0.06-0.12 mm translation, 0.075-0.078° rotation).
• EMIC-based PMC significantly enhanced PC-MRI image quality compared to no PMC and FatNav-based PMC.

Conclusions:

• The EMIC system provides superior PMC performance in 2D PC-MRI due to its higher temporal resolution motion tracking.
• EMIC-based PMC significantly improves image quality in MRI scans.
• The developed MR-visible EMIC system eliminates the need for pre-calibration, enhancing patient comfort and RF coil compatibility.