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Robot-assisted motor activation monitored by time-domain optical brain imaging

: Steinkellner, O.; Wabnitz, H.; Schmid, S.; Steingräber, R.; Schmidt, H.; Krüger, J.; Macdonald, R.


Hielscher, A.H. ; Optical Society of America -OSA-, Washington/D.C.; Society of Photo-Optical Instrumentation Engineers -SPIE-, Bellingham/Wash.:
Diffuse optical imaging III : 22 - 24 May 2011, Munich, Germany; part of SPIE/OSA European Conferences on Biomedical Optics
Bellingham, WA: SPIE, 2011 (Proceedings of SPIE 8088)
ISBN: 978-0-8194-8685-1
ISSN: 1605-7422
Paper 808807
European Conferences on Biomedical Optics <2011, Munich>
Conference "Diffuse Optical Imaging" <3, 2011, Munich>
SPIE/OSA European Conferences on Biomedical Optics <2011, Munich>
Conference Paper
Fraunhofer IPK ()
robot-assisted; optical brain imaging; motor activation

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 representati on 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.