X-ray or gamma ray systems or devices – Specific application – Computerized tomography
Reexamination Certificate
2006-12-04
2010-10-12
Glick, Edward J (Department: 2882)
X-ray or gamma ray systems or devices
Specific application
Computerized tomography
C378S057000
Reexamination Certificate
active
07813470
ABSTRACT:
An X-ray that has passed through a target object13is detected by a two-dimensional X-ray detector14capable of energy discrimination, to determine an actual X-ray strength at a specific energy level. The target object13is rotationally scanned in predetermined angular steps around an axis perpendicular to the X-ray. The target object13is imaginarily divided into a large number of micro-sized unitary cubic cells, and each detection element14ais considered to be receiving an X-ray that has passed through a plurality of unitary cubic cells. A data processor6creates a system of equations including a measured intensity ratio between the transmitted and direct X-rays and a theoretical X-ray intensity ratio calculated from the mass absorption coefficients, unknown weight ratios and density of the elements contained in each unitary cubic cell. The number of equations is equal to or larger than the total number of the elements having unknown weight ratios and the density. In this manner, one can measure the three-dimensional distribution of the weight ratio of each element and/or compound and the density in the target object containing a plurality of known kinds of elements and/or compounds.
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Glick Edward J
Shimadzu Corporation
Sughrue & Mion, PLLC
Taningco Alexander H
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