Sprectroscopic and time-resolved optical methods and apparatus for imaging objects in turbed media
US6665557B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 20, 2000 |
| Grant date | Dec 16, 2003 |
| Priority date | — |
| Expiry date | Nov 1, 2020 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B5/4312
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
Method and apparatus for imaging objects in turbid media. In one embodiment, the method comprises illuminating at least a portion of the turbid medium with substantially monochromatic light of at least two wavelengths in the 600-1500 nm spectral range. A first of the at least two wavelengths is equal to a resonance wavelength for an optical property of an object in the illuminated portion of the turbid medium but is not equal to a resonance wavelength for the turbid medium. A second of the at least two wavelengths is not equal to a resonance wavelength for either the object or the turbid medium. Light emergent from the turbid medium following each of the foregoing illuminations comprises a ballistic component, a snake component and a diffuse component. A direct shadowgram image may be obtained by preferentially passing from the emergent light, following each illumination. the ballistic and snake components thereof and detecting the preferentially passed light. Alternatively, an inverse reconstruction image may be obtained by determining, following each illumination, the intensity of the diffuse component at a plurality of points in time and then using these pluralities of intensity…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.