Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1998-07-14
2000-05-16
Lee, John R.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
382128, 600309, G01N 1506, G06K 900
Patent
active
060640731
ABSTRACT:
The invention relates to a method of localizing an object in a turbid medium, utilizing an exponential function which determines the effect of an attenuation coefficient of a voxel of the turbid medium on an intensity of light transported through the turbid medium. In order to determine the estimated intensity variation on a photodetector, for each voxel the contribution to the intensity variation is determined by means of this exponential function. In order to reduce the required calculation time, this exponential function is approximated by a function which can be split into two orthogonal vectors. Consequently, the number of times that the value of an exponential function must be determined can be substantially reduced, resulting in a substantial reduction of the calculation time required for the reconstruction of an image of the interior of the turbid medium.
REFERENCES:
patent: 5309912 (1994-05-01), Knuttel
"The forward and inverse problems in time resolved infra-red imaging", by S.R. Arridge, as published in Medical Optical Tomography, No. IS11, 1993, pp. 35-64.
"Algorithm for computer control of a digital plotter", by J.E. Bresenham, published in IBM Systems Journal, vol. 4, No. 1965, pp. 28-30.
Lee John R.
Pyo Kevin
Renfrew Dwight H.
U.S. Philips Corporation
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