ANALYSIS OF ALL POSSIBLE COMBINATIONS OF 4 MEASUREMENTS DETERMINING TRUE PROPAGATION IN ARTERIES

All possible combinations of four measurements of blood pressure, bloo d flow and vascular diameter are examined by transmission-line theory. It is found that only nine measurement combinations can give the atte nuation coefficient gamma, reflection coefficient R and characteristic impedance Z0 simultaneously. At least one pressure measurement must b e included. Their general expressions with arbitrary measuring locatio ns are presented, together with some simplified forms which cover all the previous methods. A greater choice of method is thereby made avail able for use in practice. The results show that, regardless of the mea surement locations, all combinations can be solved in the order gamma first, R second and Z0 last.