A　novel　wearable　MRg-NIRST　system　for　breast　cancer　detection　has　been　designed　and　developed.　In　this　prototype,　eight　(8)　flex　circuit　strips,　each　with　six　(6)　photo-detectors　(PDs)　and　six　(6)　source　fibers,　are　attached　to　the　breast　to　collect　diffused　light.　A　6x48　fiber　switch　and　48　side-firing　fibers　deliver　intensity　modulated　laser　light　at　six　(6)　near-infrared　wavelengths.　Light　intensity　at　each　of　2304　source-detector　positions　is　obtained　for　T-2-MRI　guided　3D　NIRST　image　reconstruction.　In　phantom　testing,　reconstructed　images　showed　the　contrast　between　tumor/inclusion　and　normal/background.