Hybrid Prospective & Retrospective Head Motion Correction System to Mitigate Cross-Calibration Errors

INTRODUCTION – Correction of head motion artifacts is essential for clinically acceptable image quality. This is especially important for long scans, such as DTI, fMRI, and high-resolution structural scans. Prospective motion-correction using stereovision systems [1,2] have been suggested to perform real-time head motion-correction without necessitating the acquisition of additional MR-based navigators. This enables real-time tracking of head motion with little or no changes to the pulse sequence. However, the accuracy requirements on the motion tracking of such systems necessitate long and meticulous scanner-camera cross-calibration times [1,2], which may not be available during clinical routines. In this study, we combine monovision-based, MR-compatible prospective motion-correction system [3] with retrospective motion-correction to mitigate residual artifacts that remain in the image after prospective motion-correction.