Kalman Filter-Based Head Tracking for Cranial Radiation Therapy with Low-Cost Range-Imaging Cameras


To allow for highly accurate localisation in stereotactic radiation therapy, patients are typically immobilised, equipped with optical markers or observed by stereoscopic X-ray imaging cameras. These methods decrease patient comfort and cause additional exposition to ionizing radiation. Consequently, there is a growing demand for contact-free approaches to compensate for patient motion. In this paper we present a first prototype for tracking head motion during radiation therapy using 3D range cameras. We propose a combination of global and local registration methods. We apply a Kalman movement model to observe head motions. The system's capabilities are analysed using a conventional Kinect-like camera which is mainly known as a low-cost consumer electronics device. Our tests show that the proposed setup has the potential of determining head positions with submillimeter accuracy in real-time. However, the use of low-cost cameras turns out to be problematic as they consistently cause substantial systematic errors in measuring depths.
Original languageEnglish
Title of host publicationBildverarbeitung für die Medizin 2014: Algorithmen - Systeme - Anwendungen Proceedings des Workshops vom 16. bis 18. März 2014 in Aachen
EditorsThomas Martin Deserno, Heinz Handels, Hans-Peter Meinzer, Thomas Tolxdorff
Number of pages6
Place of PublicationBerlin, Heidelberg
PublisherSpringer Berlin Heidelberg
Publication date04.03.2014
ISBN (Print)978-3-642-54110-0
ISBN (Electronic)978-3-642-54111-7
Publication statusPublished - 04.03.2014
EventWorkshop on Bildverarbeitung fur die Medizin 2014 - Aachen, Germany
Duration: 16.03.201418.03.2014


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