Markerless PET motion correction: tracking in narrow gantries through optical fibers

Rasmus Ramsbøl Jensen, Oline Vinter Olesen, Claus Benjaminsen, Liselotte Højgaard, Rasmus Larsen

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In a time with increasing resolution and signal-to-noise ratio of medical 3D brain scanners, there is also an increased need for tracking and motion correction of patient movements during acquisition time. To successfully implement a system for motion tracking in the clinic, the system should be accurate while only adding minimal complexity to the workflow. We present: Tracoline 2.0, a surface scanner prototype, which allows for markerless tracking in the clinic. The system uses structured light through optical fibre bundles, which easily fit in narrow gantries. The optical fibres also makes the system compatible with magnetic resonance (MR) imaging since all the electronics are moved away from the scanner. We demonstrate the system in a positron emission tomography (PET) study using the Siemens high resolution research tomography (HRRT). With two Ge/Ga-68 line sources fitted in a mannequin head mounted on a rotating stage we evaluate the system for stepwise motion with periods of rest and for continuous motion. Based on comparison with the ground truth of the rotating stage, we were able to accurately track the movement with a rotational error of -0.073º to 0.098º with a maximal SD of 0.031º for rotations up to ±25º. Based on the tracking results the PET frames were also successfully corrected for motion by aligning 10 s frames without motion for the stepwise experiment and aligning 1 s frames for the experiment with continuous motion. We have demonstrated and evaluated a system for markerless tracking and motion correction. The system is a significant step towards markerless tracking and motion correction seamlessly implemented in the clinic.
Original languageEnglish
Title of host publicationIEEE Nuclear Science Symposium Conference Record (NSS/MIC) 2014
Number of pages3
Publication date2015
Publication statusPublished - 2015
Event2014 61st IEEE Nuclear Science Symposium and Medical Imaging Conference and 21st Symposium on Room-Temperature: Semiconductor X-ray and Gamma-ray Detectors - Washington State Convention Center, Seattle, United States
Duration: 8 Nov 201415 Nov 2014
Conference number: 61/21


Conference2014 61st IEEE Nuclear Science Symposium and Medical Imaging Conference and 21st Symposium on Room-Temperature
LocationWashington State Convention Center
CountryUnited States
Internet address

Bibliographical note

M10 MIC Poster Session I - Data Analysis & Image Generation I. Presentation: M10-24

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