A fiber-optic array for breast cancer detection by way of<unk><unk>  tomography.<unk>  (DOI) is a method of<unk>  using near-infrared spectroscopy (NIRS) or fluorescence-based methods. When used to create 3D volumetric models of the imaged material DOI is referred to as<unk><unk>  tomography, whereas 2D<unk>  methods are classified as<unk> . The technique has many applications to neuroscience, sports medicine, wound monitoring, and cancer detection. Typically DOI techniques monitor changes in concentrations of oxygenated and deoxygenated hemoglobin and may additionally measure redox states of cytochromes. The technique may also be referred to as<unk><unk>  tomography (DOT), near infrared<unk>  tomography (NIROT) or fluorescence<unk><unk>  tomography (FDOT), depending on the usage. In neuroscience, functional measurements made using NIR wavelengths, DOI techniques may classify as functional near infrared spectroscopy fNIRS.
Diffuse optical imaging
Iatrochemistry
Multiple scattering low coherence interferometry
Spectral imaging 
Scanning laser polarimetry
Laser speckle contrast imaging
Optical coherence tomography angiography
Retinal vessel analysis