Self-encoded marker for optical prospective head motion correction in MRI

Forman C, Aksoy M, Hornegger J, Bammer R (2011)

Publication Type: Journal article, Original article

Publication year: 2011

Journal

Medical Image Analysis Elsevier

Original Authors: Forman C., Aksoy M., Hornegger J., Bammer R.

Publisher: Elsevier

Book Volume: 15

Pages Range: 708-719

Journal Issue: 5

DOI: 10.1016/j.media.2011.05.018

Abstract

The tracking and compensation of patient motion during a magnetic resonance imaging (MRI) acquisition is an unsolved problem. For brain MRI, a promising approach recently suggested is to track the patient using an in-bore camera and a checkerboard marker attached to the patient's forehead. However, the possible tracking range of the head pose is limited by the fact that the locally attached marker must be entirely visible inside the camera's narrow field of view (FOV). To overcome this shortcoming, we developed a novel self-encoded marker where each feature on the pattern is augmented with a 2-D barcode. Hence, the marker can be tracked even if it is not completely visible in the camera image. Furthermore, it offers considerable advantages over the checkerboard marker in terms of processing speed, since it makes the correspondence search of feature points and marker-model coordinates, which are required for the pose estimation, redundant. The motion correction with the novel self-encoded marker recovered a rotation of 18° around the principal axis of the cylindrical phantom in-between two scans. After rigid registration of the resulting volumes, we measured a maximal error of 0.39 mm and 0.15° in translation and rotation, respectively. In in vivo experiments, the motion compensated images in scans with large motion during data acquisition indicate a correlation of 0.982 compared to a corresponding motion-free reference. © 2011 Elsevier B.V.

Authors with CRIS profile

Christoph Forman Lehrstuhl für Informatik 14 (Bild- und Sprachverarbeitung) Joachim Hornegger Lehrstuhl für Informatik 14 (Bild- und Sprachverarbeitung)

Involved external institutions

Stanford University US United States (USA) (US)

How to cite

APA:

Forman, C., Aksoy, M., Hornegger, J., & Bammer, R. (2011). Self-encoded marker for optical prospective head motion correction in MRI. Medical Image Analysis, 15(5), 708-719. https://dx.doi.org/10.1016/j.media.2011.05.018

MLA:

Forman, Christoph, et al. "Self-encoded marker for optical prospective head motion correction in MRI." Medical Image Analysis 15.5 (2011): 708-719.

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