| Zugriffsnummer | 40467 |
| Dokumenttyp | Zeitschriftenartikel |
| Peer Review | mit Peer Review |
| Sprache | Englisch |
| Titel | Diffuse near-infrared imaging of tissue with picosecond time resolution |
| Autor(in); Institution |
Grosenick, Dirk; 8.3, Biomedizinische Optik, PTB-Berlin
Wabnitz, Heidrun; 8.3, Biomedizinische Optik, PTB-Berlin
Macdonald, Rainer; 8.3, Biomedizinische Optik, PTB-Berlin
|
| Quelle/Jahr | Biomedical Engineering - Biomedizinische Technik: 63 (2018), 5, 511 - 518 |
| ISSN | 0013-5585 (PRINT) ; 1862-278X (ONLINE) |
| DOI | |
| Verlag | Berlin: De Gruyter |
| Freie Schlagworte | diffuse optical imaging ; fNIRS ; near-infrared spectroscopy ; optical mammography ; time-resolved optical imaging (USPIO) |
| Zusammenfassung | Optical imaging of biological tissue in vivo at multiple wavelengths in the near-infrared spectral range can be achieved with picosecond time resolution at highest sensitivity by time-correlated single photon counting (TCSPC). Measuring and analyzing the distribution of times of flight of photons randomly propagating through tissue has been applied for diffuse optical imaging and spectroscopy, e.g. of human breast tissue and of the brain. In this article, we review the main features and the potential of near-infrared multispectral imaging with picosecond time resolution and illustrate them by exemplar applications in these fields. In particular, we discuss the experimental methods developed at the Physikalisch-Technische Bundesanstalt (PTB) to record optical mammograms and to quantify absorption and scattering properties from which hemoglobin concentration and oxygen saturation of healthy and diseased breast tissue have been derived by combining picosecond time-domain and spectral information. Furthermore, optical images of functional brain activation were obtained by a non-contact scanning device exploiting the null source-detector separation approach which takes advantage of picosecond time resolution as well. The recorded time traces of changes in the oxy- and deoxyhemoglobin concentration during a motor stimulation investigation show a localized response from the brain. |
