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(a) A 3D finite element mesh for the object used in the simulation. The mesh is a regular Delaunay tetrahedral with 17966 nodes and 99140 tetrahedrons generated by iso2mesh [36]. The object represents a section of a mouse abdomen which illustrates 5 different tissue regions: (1) adipose, (2) liver and spleen, (3) bowel and intestine, (4) kidneys, and (5) bone. (b) A schematic of the object showing the sources and detectors set up and the coordinate system.
