X-ray or gamma ray systems or devices – Specific application – Computerized tomography
Patent
1998-07-06
2000-05-23
Bruce, David V.
X-ray or gamma ray systems or devices
Specific application
Computerized tomography
378901, G01N 2304
Patent
active
060673400
ABSTRACT:
Apparatus and methods for estimating the internal structure of a physical domain (16), such as a volume of earth or of a human body, based on tomographic signals (18) having passed there through. Measurements of signals are inverted using an approximate extended Kalman filter to condition estimates of first and second spatial moments of stochastic random variables representing discrete estimates of one or more parameters describing the domain's internal structure. Measurement conditioning is alternated with upscaling in order to reduce the number of random variables used and also for the purpose of determining the geometry of the spatial regions of the domain represented by each of the random variables. Upscaling includes the use of cluster analysis for identification of random variables to merge, followed by random variable merging using random field union. Upscaling improves computational properties of the invention and can be used to identify discrete structural features in the domain. Various domain decomposition strategies can be employed to make the invention computationally feasible on even very large domains.
REFERENCES:
patent: 3778614 (1973-12-01), Hounsfield
patent: 4511219 (1985-04-01), Giles et al.
patent: 4751643 (1988-06-01), Lorensen et al.
patent: 4783744 (1988-11-01), Yueh
patent: 5068788 (1991-11-01), Goodenough et al.
"3-D Maximum a Posteriori Estimation for Single Photon Emission Computed Tomography on Massively-parallel Computers," by Miller, et. al., IEEE trans. on Med. Imaging, 12(3):560-565, 1993.
"Three-Dimensional Massively Parallel Electromagnetic Inversion--Ii. Analysis of a Crosswell Electromagnetic Experiment," by Alumbaugh, et. al., Geophys. J. Int., 128:355-363, 1997.
Applied Optimal Estimation, by Gelb, et al., The M.I.T. Press, Cambridge, MA., 1974.
Algorithms for Clustering Data, by Jain, et al., Prentice-Hall, Englewood Cliffs, N.J., 1988.
Random Fields: Analysis and Synthesis, by Erik Vanmarcke, The M.I.T. Press, Cambridge, MA, 1983.
"Computerized Geophysical Tomography," by Dines, et al. Proc. of the IEEE, 67(7):1065-1073, 1979.
"Traveltime Inversion for the Geometry of Aquifer Lithologies," Geophysics, 61(6):1728-1737, 1996.
"An Interative Stochastic Inverse Method: Conditional Effective Transmissivity and Hydraulic Head Fields," by Yeh, et al. Water Resources Research, 32(1):85-92, 1996.
"Mapping Hydraulic Conductivity: Sequential Conditioning with Measurements of Solute Arrival Time, Hydraulic Head, and Local Conductivity," by Harvey, et. al., Water Resources Research, 31(7):1615-1626, 1995.
"Simultaneous Estimation of Transmissivity Values and Zonation," by Eppstein, et al., Water Resources Research, 32(11):3321-3336, 1996.
"Optimal 3-D Traveltime Tomography," by Eppstein, et al., Geophysics 63(3): 1053-106, 1998.
"Efficient 3-d Data Inversion: Soil Characterization and Moisture Monitoring from Crosswell Gpr at a Vermont Test Site," by Eppstein, et al., Water Resources Research 34(8):1889-1900, 1998.
Dougherty David E.
Eppstein Margaret J.
LandOfFree
Three-dimensional stochastic tomography with upscaling does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Three-dimensional stochastic tomography with upscaling, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Three-dimensional stochastic tomography with upscaling will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1842208