Prospective motion correction using inductively coupled wireless RF coils
Open Access
- 27 June 2013
- journal article
- research article
- Published by Wiley in Magnetic Resonance in Medicine
- Vol. 70 (3), 639-647
- https://doi.org/10.1002/mrm.24845
Abstract
Purpose A novel prospective motion correction technique for brain MRI is presented that uses miniature wireless radio‐frequency coils, or “wireless markers,” for position tracking. Methods Each marker is free of traditional cable connections to the scanner. Instead, its signal is wirelessly linked to the MR receiver via inductive coupling with the head coil. Real‐time tracking of rigid head motion is performed using a pair of glasses integrated with three wireless markers. A tracking pulse‐sequence, combined with knowledge of the markers' unique geometrical arrangement, is used to measure their positions. Tracking data from the glasses is then used to prospectively update the orientation and position of the image‐volume so that it follows the motion of the head. Results Wireless‐marker position measurements were comparable to measurements using traditional wired radio‐frequency tracking coils, with the standard deviation of the difference < 0.01 mm over the range of positions measured inside the head coil. Wireless‐marker safety was verified with B1 maps and temperature measurements. Prospective motion correction was demonstrated in a 2D spin‐echo scan while the subject performed a series of deliberate head rotations. Conclusion Prospective motion correction using wireless markers enables high quality images to be acquired even during bulk motions. Wireless markers are small, avoid radio‐frequency safety risks from electrical cables, are not hampered by mechanical connections to the scanner, and require minimal setup times. These advantages may help to facilitate adoption in the clinic. Magn Reson Med 70:639–647, 2013.Funding Information
- NIH (2R01 EB00271108-A1, 5RO1 EB008706, 5R01 EB01165402-02)
- CAMRT at Stanford (P41 EB015891)
- Lucas Foundation and Oak Foundation
This publication has 25 references indexed in Scilit:
- Adiabatic RF pulse design for Bloch-SiegertB+ mappingMagnetic Resonance in Medicine, 2012
- Prospective optical motion correction for 3D time‐of‐flight angiographyMagnetic Resonance in Medicine, 2012
- Real‐time correction by optical tracking with integrated geometric distortion correction for reducing motion artifacts in functional MRIMagnetic Resonance in Medicine, 2012
- Combined prospective and retrospective correction to reduce motion‐induced image misalignment and geometric distortions in EPIMagnetic Resonance in Medicine, 2012
- Real‐time optical motion correction for diffusion tensor imagingMagnetic Resonance in Medicine, 2011
- Echo‐planar imaging with prospective slice‐by‐slice motion correction using active markersMagnetic Resonance in Medicine, 2011
- PROMO: Real‐time prospective motion correction in MRI using image‐based trackingMagnetic Resonance in Medicine, 2009
- Navigator accuracy requirements for prospective motion correctionMagnetic Resonance in Medicine, 2009
- Prospective head‐movement correction for high‐resolution MRI using an in‐bore optical tracking systemMagnetic Resonance in Medicine, 2009
- Prospective real‐time correction for arbitrary head motion using active markersMagnetic Resonance in Medicine, 2009