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

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

doi:10.1117/12.889505

14 June 2011 Robot-assisted motor activation monitored by time-domain optical brain imaging

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

Proceedings Volume 8088, Diffuse Optical Imaging III; 808807 (2011) https://doi.org/10.1117/12.889505
Event: European Conferences on Biomedical Optics, 2011, Munich, Germany

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.

Citation Download Citation

O. Steinkellner, H. Wabnitz, S. Schmid, R. Steingräber, H. Schmidt, J. Krüger, and R. Macdonald "Robot-assisted motor activation monitored by time-domain optical brain imaging", Proc. SPIE 8088, Diffuse Optical Imaging III, 808807 (14 June 2011); https://doi.org/10.1117/12.889505

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KEYWORDS

Brain

Near infrared spectroscopy

Photons

Tissue optics

Brain imaging

Data analysis

Hemodynamics

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