Prospective Motion Correction for 3D Pseudo-Continuous Arterial Spin Labeling Using an External Optical Tracking System
- Head motion is an unsolved problem in magnetic resonance imaging (MRI) studies of the brain. Real-time tracking using an optical camera has recently been proposed as a way to remove head motion artifacts. As compared to navigator-based approaches that use MRI data to detect and correct motion, optical motion correction works independent of the MRI scanner, thus providing low-latency real-time motion updates without requiring any modifications to the pulse sequence. The purpose of this study was two fold: 1) to demonstrate that prospective optical motion correction using an optical camera mitigates artifacts from head motion in three dimensional pseudo-continuous arterial spin labeling (3D PCASL) acquisitions and 2) to assess the effect of latency differences between real-time optical motion tracking and a navigator-style approach. An optical motion correction system comprising a single camera and a marker attached to the patient’s forehead was used to track motion at a rate of 30fps. In the presence of motion, continuous tracking data from the optical system was used to update the scan plane in real-time during the 3D-PCASL acquisition. Navigator-style correction was simulated using the tracking data from the optical system, but performing updates once per repetition time. Three normal volunteers and a patient were instructed to perform continuous head motion throughout the scan. Optical motion correction yielded superior image quality compared to uncorrected images or images using navigator-style correction, as evidenced by increased resemblance to reference data. Data obtained from the patient revealed that motion can obscure pathology and that application of optical prospective correction can successfully reveal the underlying pathology in the presence of head motion.
|Type of resource
|March 2014 - June 2015
|Magnetic Resonance Imaging
|Arterial Spin Labeling
|Aksoy, M, Maclaren, J, and Bammer, R. (2017). "Prospective motion correction for 3D pseudo-continuous arterial spin labeling using an external optical tracking system." Magnetic Resonance Imaging, 39:44-52. https://doi.org/10.1016/j.mri.2017.01.018
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