X-ray or gamma ray systems or devices – Electronic circuit – With display or signaling
Reexamination Certificate
2008-06-08
2010-06-22
Ho, Allen C. (Department: 2882)
X-ray or gamma ray systems or devices
Electronic circuit
With display or signaling
C378S057000, C378S098900
Reexamination Certificate
active
07742568
ABSTRACT:
A dual-energy x-ray imaging system searches a moving automobile for concealed objects. Dual energy operation is achieved by operating an x-ray source at a constant potential of 100 KV to 150 KV, and alternately switching between two beam filters. The first filter is an atomic element having a high k-edge energy, such as platinum, gold, mercury, thallium, lead, bismuth, and thorium, thereby providing a low-energy spectrum. The second filter provides a high-energy spectrum through beam hardening. The low and high energy beams passing through the automobile are received by an x-ray detector. These detected signals are processed by a digital computer to create a steel suppressed image through logarithmic subtraction. The intensity of the x-ray beam is adjusted as the reciprocal of the measured automobile speed, thereby achieving a consistent radiation level regardless of the automobile motion. Accordingly, this invention provides images of organic objects concealed within moving automobiles without the detritus effects of overlying steel and automobile movement.
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International Search Report and Written Opinion for Application No. PCT/US2009/038903, 10 pp., dated Dec. 1, 2009 (mailing date).
Ho Allen C.
King & Spalding LLP
Spectrum San Diego, Inc.
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