Figure 3.

Reconstructed absorption map of a homogenous phantom of 2 cm diam with the center located at depth of 2 cm. (a, b) High-contrast phantom without and with depth correction, respectively; (c, d) low-contrast phantom without and with depth correction, respectively. Each image consists of six subimages. Each subimage is the spatial x-y image of 8×8 cm reconstructed at the depth marked on its title. The increment in depth is 0.5 cm. For the absorption maps reported in this paper, the spatial dimensions of the subimage were kept the same and the reconstruction depth might be different based on the target location.