A frequency domain photon migration (FDPM) system was developed at the University of California Irvine, and is now part of a multi-center clinical trial having a goal of evaluating performance across different institutions [ 28– 31].
Kuwana et al. [ 16] applied a frequency domain proton migration technique to measure the phase shift and thus the lifetime of a pH-sensing fluorophore, carboxy seminaphthofluorescein-1 immobilized on poly ethylene glycol) microparticles.
In brief, the instrument combines frequency domain photon migration (FDPM) and continuous-wave near-infrared spectroscopy (CW-NIRS) measurements to determine the optical scattering and absorption spectra (650 to 1,000 nm) of the measured tissue.
Traditionally, there are several experimental approaches which can provide information on the optical properties for turbid media, i.e., time-of-flight spectroscopy (TOFS) [ 12], the frequency domain photon migration (FDPM) technique [ 13], and the spatially-resolved diffuse reflectance method [ 14], etc.
There is no doubt that in the domain of migration policy, Europe obtains results only if all countries work together.
Additionally, the experimental results suggest that in [PBI4N(HfO2)x](H3PO4 y membranes the conductivity occurs owing to three conductivity pathways: two mechanisms involving inter-domain proton migration phenomena by "hopping" events; and one mechanism in which proton exchange occurs between delocalization bodies.
Raft-associated proteins have been previously documented to translocate to uropod-like domains upon migration, as well as to the immune synapse during T cell activation [27], [29], [42].
The DOSI technique combines laser-based frequency-domain photon migration with broadband near-infrared spectroscopy to separate optical absorption and scattering over a broad spectral range [ 20].
Briefly, DOSI consists of a combined frequency-domain photon migration (FDPM) component and a broadband steady-state (SS) component integrated together to produce broadband absorption and scattering spectra of tissues from 650 to 1,000 nm.
Although NIR was first applied to breast diaphanography more than 70 years ago, quantitative optical methods employing time- or frequency-domain 'photon migration' technologies have only recently been used for breast imaging.
The laser breast scanner is a bedside-capable system that combines frequency-domain photon migration with steady-state tissue spectroscopy to measure complete (broadband) NIR absorption and reduced scattering spectra of breast tissue in vivo.
