Time-resolved diffusion tomographic 2D and 3D imaging in highly scattering turbid media
US6108576A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 10, 1997 |
| Grant date | Aug 22, 2000 |
| Priority date | — |
| Expiry date | Feb 10, 2017 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B5/0091
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method for imaging objects in highly scattering turbid media. According to one embodiment of the invention, the method involves using a plurality of intersecting source/detectors sets and time-resolving equipment to generate a plurality of time-resolved intensity curves for the diffusive component of light emergent from the medium. For each of the curves, the intensities at a plurality of times are then inputted into the following inverse reconstruction algorithm to form an image of the medium: wherein W is a matrix relating output at source and detector positions r.sub.s and r.sub.d, at time t, to position r, .LAMBDA. is a regularization matrix, chosen for convenience to be diagonal, but selected in a way related to the ratio of the noise, <nn>to fluctuations in the absorption (or diffusion) X.sub.j that we are trying to determine: EQU .LAMBDA..sub.ij =.lambda..sub.j .delta..sub.ij with .lambda..sub.j =<nn>/<.DELTA.Xj.DELTA.Xj> Y is the data collected at the detectors, and X.sup.k is the kth iterate toward the desired absorption information. An algorithm, which combines a two dimensional (2D) matrix inversion with a one-dimensional (1D) Fourier transform inversion is used to obt…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.