Dr. David M. Beylin Profile

Dr. David M. Beylin

Chief Executive Officer

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Proceedings Article | 18 March 2015 Paper

Evaluation of a video-based head motion tracking system for dedicated brain PET

S. Anishchenko, D. Beylin, P. Stepanov, A. Stepanov, I. Weinberg, S. Schaeffer, V. Zavarzin, D. Shaposhnikov, M. Smith

Proceedings Volume 9412, 94121P (2015) https://doi.org/10.1117/12.2082137

KEYWORDS: Head, Positron emission tomography, Magnetic tracking, Brain, Scanners, Cameras, Video, Computing systems, Data acquisition, Image resolution

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Unintentional head motion during Positron Emission Tomography (PET) data acquisition can degrade PET image quality and lead to artifacts. Poor patient compliance, head tremor, and coughing are examples of movement sources. Head motion due to patient non-compliance can be an issue with the rise of amyloid brain PET in dementia patients. To preserve PET image resolution and quantitative accuracy, head motion can be tracked and corrected in the image reconstruction algorithm. While fiducial markers can be used, a contactless approach is preferable. A video-based head motion tracking system for a dedicated portable brain PET scanner was developed. Four wide-angle cameras organized in two stereo pairs are used for capturing video of the patient’s head during the PET data acquisition. Facial points are automatically tracked and used to determine the six degree of freedom head pose as a function of time. The presented work evaluated the newly designed tracking system using a head phantom and a moving American College of Radiology (ACR) phantom. The mean video-tracking error was 0.99±0.90 mm relative to the magnetic tracking device used as ground truth. Qualitative evaluation with the ACR phantom shows the advantage of the motion tracking application. The developed system is able to perform tracking with accuracy close to millimeter and can help to preserve resolution of brain PET images in presence of movements.

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