XRD-based false alarm resolution in megavoltage computed tomography systems
First Claim
1. A threat detection system for identifying the contents of an object, comprising:
- a base defining an axis;
a frame moveably coupled to the base, the frame moveable with respect to the base in a direction parallel to the axis;
a platform configured to support the object, the platform moveably coupled to the frame, the platform moveable with the frame and rotatable with respect to the frame about the axis;
a first radiation source fixedly positioned with respect to the platform, the first radiation source configured to transmit radiation through the object;
a second radiation source positioned with respect to the platform so as to transmit radiation through the object; and
a first detector moveably positioned with respect to the second radiation source, the detector configured to detect radiation transmitted through the object from at least the second radiation source and to generate a signal representative of the detected radiation.
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Accused Products
Abstract
System and method for XRD-based false alarm resolution in computed tomography (“CT”) threat detection systems. Following a scan of an object with a megavoltage CT-based threat detection system, a suspicious area in the object is identified. The three dimensional position of the suspicious area is used to determine a ray path for the XRD-based threat detection system that provides minimal X-ray attenuation. The object is then positioned for XRD scanning of the suspicious area along this determined ray path. The XRD-based threat detection system is configured to detect high density metals (“HDMs) as well as shielded Special Nuclear Materials (“SNMs”) based on cubic or non-cubic diffraction profiles.
30 Citations
20 Claims
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1. A threat detection system for identifying the contents of an object, comprising:
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a base defining an axis; a frame moveably coupled to the base, the frame moveable with respect to the base in a direction parallel to the axis; a platform configured to support the object, the platform moveably coupled to the frame, the platform moveable with the frame and rotatable with respect to the frame about the axis; a first radiation source fixedly positioned with respect to the platform, the first radiation source configured to transmit radiation through the object; a second radiation source positioned with respect to the platform so as to transmit radiation through the object; and a first detector moveably positioned with respect to the second radiation source, the detector configured to detect radiation transmitted through the object from at least the second radiation source and to generate a signal representative of the detected radiation. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A multi-point, multi-angle, detection system, comprising:
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a base; an actuator in communication with the base and having one or more of a vertical movement, a horizontal movement, and a rotational movement; a platform coupled to the actuator; an x-ray diffraction (“
XRD”
) radiation source fixedly positioned with respect to the base, the XRD radiation source transmitting a beam of radiation;an adjustable diaphragm positioned to receive the beam of radiation from the XRD radiation source, the adjustable diaphragm forming a primary beam aperture having a primary beam axis; a secondary collimator positioned to receive the radiation transmitted through the object from the XRD radiation source; and at least one detector configured to detect radiation transmitted through the secondary collimator and to generate a signal representative of the detected radiation. - View Dependent Claims (9, 10, 11, 12, 13)
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14. A method of scanning the contents of an object with a threat detection system, said method comprising:
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performing a computed tomography (“
CT”
) scan of the object;reconstructing an image from data collected from the CT scan; identifying a suspicious area of the object using the image; moving the suspicious area of the object to a measurement plane of a second radiation source; and adjusting the second radiation source to irradiate the suspicious area. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification