Article

The morphological changes of muscle can be accurately detected by sonography, a
process we have termed sonomyography (SMG).
This article investigates the
feasibility of using muscle thickness deformation SMG as a new signal source to
control a prosthetic hand in real time. Thickness deformation SMG of the extensor
muscle was measured by a block-matching algorithm during wrist extension-flexion;
the amplitude of the deformation was used to control the prosthetic hand. We
compared various fast-search algorithms to select the best one for real-time
prosthetic control. The two-dimensional logarithmic search (TDL) algorithm, with
and without streaming single-instruction multiple-data extensions, showed
excellent execution efficiency, with an overall mean correlation coefficient of
about 0.99, a mean standard root-mean-square error <0.75, and a mean relative
root-mean-square error <8.0% referenced to the cross-correlation algorithm
baseline. The mean frame rates were greater than the ultrasound sampling rate (12
Hz), indicating that TDL could be implemented in real-time control. These results
demonstrate that only one muscle position is needed to control a prosthetic hand,
allowing for proprioception of muscle tension, and that the SMG provides good
control of the prosthetic hand, allowing it to proportionally open and close with
a fast-search algorithm.

Langue : ANGLAIS