DLP technology application: 3D head tracking and motion correction in medical brain imaging
Proceedings of SPIE(2014)
摘要
We demonstrate a tracking prototype system based on DLP Technology for medical brain imaging. The system referred to as Tracoline has been tested for motion correction in position emission tomography (PET) on phantom and human studies. This work summaries the complete system from the technical design to the used calibration and pose estimation methods, and finally the clinical demonstration. The Tracoline system is based on the Pico DLP light projector reengineered to project at near infrared wavelengths to maintain patient comfort. The system uses the principle of a structured light surface scanner to track the subject. Partial 3D surface representations of the forehead are computed from projection of a set of phase-shifted cosine patterns. The system returns the relative head poses used for motion compensation in the post processed medical image reconstruction or can potentially be used to feed the medical scanner on the fly for prospective motion compensation. The major advantage of the presented system for this particular application is; it does not rely on markers compared to other demonstrated systems. This makes the Tracoline system attractive for clinical use since time consuming and error prone marker attachment is avoided. In-situ dynamic PET data of a healthy subject shows significant reduction of acquisition artifacts.
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关键词
Structured light,computer vision system,head tracking,motion correction,phase shift interferometry,infrared DLP projection,positron emission tomography
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