Computation of the torsion subgroup of Whitehead group of a semiramified division algebra

Let D be a division algebra finite-dimensional over its center F. Let K1(D) be its Whitehead group and T(D) be the torsion subgroup of K1(D). We establish a connection between T(D), data over the residue algebra, and relative value group when F admits a Henselian valuation. In the case that D is a nicely semiramified division algebra we give an explicit formula for T(D).