Handbook of Biomedical Optics

352 Handbook of Biomedical Optics

80 × 80 = 6400 source–detector combinations. Measurements

consisted of the logarithmic amplitude and phase shi at each

detector position, given an amplitude-modulated input signal

of 100 MHz.

e forward data were generated with a nite element model,

using an unstructured mesh consisting of 83,142 nodes and

444,278 four-noded tetrahedral elements, using piecewise linear

basis functions.

For the reconstructions, a coarser mesh consisting of 27,084

nodes and 141,702 four-noded tetrahedral elements was used to

compute the forward data. e reconstruction was performed

on a regular grid of trilinear basis ...