Wave imaging
![wave imaging wave imaging](https://www.researchgate.net/profile/Mickael-Tanter/publication/224026237/figure/fig3/AS:668933094903819@1536497486522/Supersonic-shear-wave-imaging-a-These-four-frames-are-from-an-ultrasound-movie-of.png)
Both sources and detectors can be coupled with the tissue by means of optical fibers. Among the detectors there are photomultiplier tubes, avalanche photodiodes, and CCD cameras. PDWI instruments employ lasers, light-emitting diodes and gas-discharge tubes as sources of light. PDWI is an especially promising tool for neonatology, because the infant tissues have low absorption. Optics Express 6(3), 49–57 ( Figures 1 and 4).īecause of its low cost, noninvasiveness, and compact size of the optical sensors, PDWI is also considered to be a promising tool for mammography and structural imaging of anomalies in the brain. Adapted with permission from Franceschini MA, Toronov V, Filiaci M, Gratton E, Fantini S (2000) On-line optical imaging of the human brain with 160-ms temporal resolution. The measurement protocol involved hand-tapping with the right hand (contralateral to the imaged brain area). (b) Maps of oxyhemoglobin (, left panels) and deoxyhemoglobin ( right panels) concentration changes at rest (top) and at the time of maximum response during the third tapping period (bottom). The rectangle inside the head outline is the 4×9 cm 2 imaged area. Two larger green circles represent detector fiber bundles. Each one of the eight small red circles (numbered 1–8) represents one pair of source fibers at 758 and 830 nm. (a) Geometrical arrangement of the 16 sources and two detectors on the head of a human subject.