Fast Cross-Calibration Between MR Scanner and Optical System for Prospective Motion Correction

INTRODUCTION – Utilization of stereovision [1,2] or monovision [3] systems have been suggested as a way to perform rigid head motion correction for MRI. Since no additional MR-based navigator acquisition is required, these systems can be used with any scanning protocol with only minimal changes to the sequence. However, the usability of optical systems in clinical practice has so far been limited. One of the most important reasons for this is the long and tedious cross calibration times that might take minutes required to find the geometric relationship between the optical and the scanner frame-of-reference. This step usually requires the acquisition of calibration data at the beginning of each patient study. Here, we propose a way to perform cross-calibration that is acceptable for clinical use. By using a fast scan with a small field-of-view, we were able to run the cross calibration within ~10 seconds.