Enhanced local tomography

Patent · Mon Jan 01 00:00:00 EST 1996

OSTI ID:870586

Katsevich, Alexander J ^[1]; Ramm, Alexander G ^[2]

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1. Los Alamos, NM
2. Manhattan, KS

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.

• Research Organization: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
• Assignee: Regents of University of California (Alameda, CA)
• Patent Number(s): US 5550892
• OSTI ID: 870586
• Country of Publication: United States
• Language: English

Related Subjects

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
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