A portable near infrared scanning polarization imaging unit with an optical fiber-based rectal probe, namely Photonic
Finger, was designed and developed o locate the 3D position of abnormal prostate site inside normal prostate tissue. An
inverse algorithm, Optical Tomography using Independent Component Analysis (OPTICA) was improved particularly
to unmix the signal from targets (cancerous tissue) embedded in a turbid medium (normal tissue) in the backscattering
imaging geometry. Photonic Finger combined with OPTICA was tested to characterize different target(s) inside different
tissue medium, including cancerous prostate tissue embedded by large piece of normal tissue.
It was shown that broadband near infrared fluorescence in recently discovered in Bi-doped glasses is not specific to Biions.
Germanate glasses doped with different <i>6p</i> (Bi, Pb) and <i>5p</i> (Sn, Sb) ions (co-doped with Al) exhibit similar behavior. The centers can be characterized by 4 peaks in the excitation-emission plots. The decay of fluorescence (excited with short laser pulse at 800 nm and 532 nm) has complex behavior. The components of the decay are in the nsto ms- range and they have different temperature dependences. To our opinion, existing models of optical center suggested earlier should be revised to agree with new data.