Clinical example of a stage I breast cancer. (A) Co-registered US showed a suspicious 1 cm mass on the left breast of a 61-years-old woman. (B)-(D) computed tHb, oxyHb and deoxyHb maps. The absorption maps of 740 nm, 780 nm and 808 nm are quite homogeneous, however, the map at 830 nm shows more periphery distribution (not shown). As a result, the computed oxyHb shows more periphery distribution.