A UWB system design for high precision surface reconstruction in radiation therapy

Abstract In this article, we present an ultra-wideband (UWB) system design and an algorithmic scheme for tracking a human torso in radiation therapy. The hardware consists of three multiple input multiple output (MIMO) modules operating in the frequency range from 6.5 to 10.5 GHz. The algorithm combines a Fourier-based unwrapping technique for spatial surface reconstruction with an additional temporal unwrapping for surface tracking. Simulations on male and female torso models yielded sub-millimeter errors for the male model and slightly above 1 mm for the female model. For further validation purposes, a torso phantom was designed and measurements conducted. The comparison to a reference system showed a relative error in the sub-millimeter range again.