Prospective Motion Correction for Brain MRI Using an External Tracking System

Area of Science:

• Radiology
• Medical Imaging
• Neuroimaging

Background:

• Motion is a significant factor degrading clinical MRI image quality.
• Prospective motion correction (PMC) systems offer a potential solution to mitigate motion artifacts.
• High-resolution 3D magnetization-prepared rapid gradient-echo (MPRAGE) sequences are particularly sensitive to motion.

Purpose of the Study:

• To evaluate the effectiveness of a commercial prospective motion correction (PMC) system.
• To assess the impact of PMC on reducing motion during high-resolution 3D MPRAGE acquisition.
• To determine if PMC improves diagnostic quality in brain MRI.

Main Methods:

• 100 patients undergoing brain MRI on a 3.0T scanner were prospectively imaged.
• 3D MPRAGE sequences were acquired both with and without PMC.
• A camera-based system tracked head motion in real-time, adjusting MRI acquisition accordingly.
• Two neuroradiologists independently assessed image quality using a 5-point Likert scale.

Main Results:

• The rate of nondiagnostic studies decreased significantly from 19.5% without PMC to 5.7% with PMC (P = .001).
• Inter-rater reliability for assessing diagnostic quality was high (Kappa = 0.78-0.84).
• Specific nondiagnostic rates were 17.2-20.7% without correction and 5.7-8% with correction.

Conclusions:

• The evaluated motion tracking system effectively reduces motion artifacts in clinical practice.
• Prospective motion correction significantly improves the image quality of 3D MPRAGE brain MRI.
• This technology enhances the diagnostic utility of high-resolution MRI sequences.