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Title: Enhanced local tomography

Local tomography is enhanced to determine the location and value of a discontinuity between a first internal density of an object and a second density of a region within the object. A beam of radiation is directed in a predetermined pattern through the region of the object containing the discontinuity. Relative attenuation data of the beam is determined within the predetermined pattern having a first data component that includes attenuation data through the region. In a first method for evaluating the value of the discontinuity, the relative attenuation data is inputted to a local tomography function .function..sub..LAMBDA. to define the location S of the density discontinuity. The asymptotic behavior of .function..sub..LAMBDA. is determined in a neighborhood of S, and the value for the discontinuity is estimated from the asymptotic behavior of .function..sub..LAMBDA.. In a second method for evaluating the value of the discontinuity, a gradient value for a mollified local tomography function .gradient..function..sub..LAMBDA..epsilon. (x.sub.ij) is determined along the discontinuity; and the value of the jump of the density across the discontinuity curve (or surface) S is estimated from the gradient values.
Inventors:
 [1];  [2]
  1. (Los Alamos, NM)
  2. (Manhattan, KS)
Issue Date:
OSTI Identifier:
870586
Assignee:
Regents of University of California (Alameda, CA) LANL
Patent Number(s):
US 5550892
Research Org:
Los Alamos National Laboratory (LANL), Los Alamos, NM
Country of Publication:
United States
Language:
English
Subject:
enhanced; local; tomography; determine; location; value; discontinuity; internal; density; region; beam; radiation; directed; predetermined; pattern; containing; relative; attenuation; data; determined; component; method; evaluating; inputted; function; lambda; define; asymptotic; behavior; neighborhood; estimated; gradient; mollified; epsilon; ij; jump; curve; surface; values; tomography function; local tomography; predetermined pattern; internal density; /378/

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