In　the　past　decades,　the　requirements　of　non-invasive,　non-radiation　in　medical　imaging　diagnosis　and　treatment　is　much　higher.　Diffusion　optical　tomography　(DOT)　technology　increases　more　widespread　concern.　In　this　paper,　a　system　designed　in　the　frequency　domain　for　diffuse　optical　tomography　(DOT)　imaging　is　described.　The　experimental　platform　utilizes　660nm　laser　modulated　to　100MHZ,　16　parallel　positions　of　detection　at　which　a　photomultiplier-tube　is　placed　to　detect　flux　of　light　on　the　external　periphery　of　the　tissue-simulating　phantom　made　by　gelatin.　The　reconstructed　image　of　the　absorption　and　scattering　coefficients　are　obtained　by　using　the　Levenberg-Marquardt　(L-M)　reconstruction　algorithm　to　solve　for　the　optimal　fitness　between　the　measurement　data　and　calculated　data.　This　paper　puts　forward　a　new　method　that　calculates　the　flux　of　area　on　the　external　periphery　of　the　model　by　the　forward　algorithms　to　reduce　the　measurement　error,　which　is　caused　by　the　mismatching　between　the　flux　of　area　the　photomultiplier　detects　and　the　flux　of　dot　the　forward　algorithms　calculate　in　the　traditional　method.　The　experimental　result　shows　that　the　proposed　method　can　improve　the　reconstructed　image　of　absorption　and　scattering　coefficients.　©　(2014)　Trans　Tech　Publications,　Switzerland.