“…In this case, all sources and detectors are located on two circles defined by 1 = {(x, y, z) : x 2 + y 2 = 1.5 2 , z 1 = 2.2} and 2 = {(x, y, z) : x 2 + y 2 = 1.5 2 , z 2 = 3.5}. Similar measurement configurations are commonly used in our and other laboratories [38,44,47,69], for example, for optical measurements in finger joints, or small animal studies. For the discrete ordinate method, we use the level symmetric discrete ordinate arrangement and the corresponding weight set from [46].…”