14 June 2011 Robot-assisted motor activation monitored by time-domain optical brain imaging
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Abstract
Robot-assisted motor rehabilitation proved to be an effective supplement to conventional hand-to-hand therapy in stroke patients. In order to analyze and understand motor learning and performance during rehabilitation it is desirable to develop a monitor to provide objective measures of the corresponding brain activity at the rehabilitation progress. We used a portable time-domain near-infrared reflectometer to monitor the hemodynamic brain response to distal upper extremity activities. Four healthy volunteers performed two different robot-assisted wrist/forearm movements, flexion-extension and pronation-supination in comparison with an unassisted squeeze ball exercise. A special headgear with four optical measurement positions to include parts of the pre- and postcentral gyrus provided a good overlap with the expected activation areas. Data analysis based on variance of time-of-flight distributions of photons through tissue was chosen to provide a suitable representation of intracerebral signals. In all subjects several of the four detection channels showed a response. In some cases indications were found of differences in localization of the activated areas for the various tasks.
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O. Steinkellner, O. Steinkellner, H. Wabnitz, H. Wabnitz, S. Schmid, S. Schmid, R. Steingräber, R. Steingräber, H. Schmidt, H. Schmidt, J. Krüger, J. Krüger, R. Macdonald, R. Macdonald, } "Robot-assisted motor activation monitored by time-domain optical brain imaging", Proc. SPIE 8088, Diffuse Optical Imaging III, 808807 (14 June 2011); doi: 10.1117/12.889505; https://doi.org/10.1117/12.889505
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