31 results about "Large area detector" patented technology

An imaging system including an integral computed tomography and interventional (CT / I) system that includes a large-area detector configured to acquire projection data corresponding to a field of view of the system from one or more view angles is presented. The system includes a computing device operatively coupled to the CT / I system and configured to process the acquired projection data to generate a 2D projection image in real-time, a 3D cross-sectional image of a region of interest in the subject, a combined image using the 2D projection image and the 3D cross-sectional image and / or control selective generation of the 2D projection image, the 3D cross-sectional image and / or the combined image based on one or more imaging specifications. The system also includes a display operatively coupled to the computing device and configured to display the 2D projection image, the 3D cross-sectional image and / or the combined image based on the imaging specifications.

In exemplary embodiments of the present invention, containers, such as, for example, those used in transportation and shipping, can be inspected by using a CT X-ray scanning system with a large area detector plate. In exemplary embodiments of the present invention the detector plate can directly convert X-rays transmitted through the container into visible light, thus forming light patterns on the outer surface of the plates. The plates can then be analyzed using, for example, CCD or ICCD cameras and a data processor so as to form real-time 2D and / or 3D images of objects in the container. In exemplary embodiments of the present invention each such plate can comprise a coating of X-ray converting material such as, for example, a phosphor on a metallic plate. In exemplary embodiments of the present invention an exemplary scanning system can, for example, rotate a rotor having an X-ray source on one side of an axis of rotation, and a detector including such detector plates on the other side of the axis. In exemplary embodiments of the present invention a container can be moved, through an opening in the rotor and support structure in synchronization with the rotor, such as, for example, by transporting the container on rails.

An efficient, large-area-detector and readout-system for combined sub-mm spatial imaging and time-of-flight spectrometry of fast and slow neutrons, as well as gamma-rays, capable of loss-free operation in mixed neutron-gamma fields of very high intensity.

A Si-based diode (10, 10′, 100) is formed by epitaxially depositing a Si-based diode structure on a silicon substrate. The Si-based diode structure includes a Si-based pn junction (16, 16′, 18, 18′, 30, 32, 160, 161) having a backward diode current-voltage characteristic in which the forward tunneling current is substantially smaller than the backward tunneling current at comparable voltage levels. In some embodiments, the Si-based pn junction includes at least one non-silicon or silicon alloy layer such as at least one SiGe layer (16, 16′, 160, 161). In some embodiments, at least one delta doping (30, 32) is disposed on the silicon substrate in or near the pn junction, that together with the Si-based pn junction define an electrical junction having the backward diode current-voltage characteristic. A large area detector array may include a plurality of such Si-based diodes (10, 10′, 100).

A beta radiation monitor (70,90), comprising a gas flow proportional detector (60) for detecting beta radiation emitted by a beta emitter external to the detector; a fill gas supply (51) configured to supply a fill gas to the detector, wherein the fill gas comprises nitrogen; a temperature sensor (72) for measuring temperature; and a controller (64) in communication with the temperature sensor for adjusting an operational parameter of the monitor in accordance with the measured temperature. The operational parameter may comprise a voltage applied across the fill gas, which may be thermistor controlled, or a beta radiation detection threshold of the detector. The fill gas is supplied by a nitrogen generator. The gas flow proportional detector may be a large-area detector.

Various approaches are discussed for using four-side buttable CMOS tiles to fabricate detector panels, including large-area detector panels. Fabrication may utilize pads and interconnect structures formed on the top or bottom of the CMOS tiles. Electrical connection and readout may utilize readout and digitization circuitry provided on the CMOS tiles themselves such that readout of groups or sub-arrays of pixels occurs at the tile level, while tiles are then readout at the detector level such that readout operations are tiered or multi-level.

An efficient, large-area-detector and readout-system for combined sub-mm spatial imaging and time-of-flight spectrometry of fast and slow neutrons, as well as gamma-rays, capable of loss-free operation in mixed neutron-gamma fields of very high intensity.

Embodiments incorporate a method and apparatus for detection of radiation. Embodiments detect fast and / or thermal neutrons. Embodiments detect neutrons in high backgrounds of gamma rays. Embodiments can have high sensitivity and / or high gamma discrimination. Embodiments include a given single material that detects fast neutrons and simultaneously detect gamma rays with moderate energy resolution. Embodiments utilize liquid, viscous liquid, gel, and / or solid scintillating materials. Embodiments incorporate a scintillating matrix, such as a liquid, having a highly polar matrix, such as a liquid solvent, dissolved dyes, and a high concentration of a dissolved organo metallic compound. The use of a single material for a large area detector of fast neutrons and gamma rays can provide material and cost benefits.

Method and apparatus for detection of radiation, including: a method and apparatus for detection of fast and / or thermal neutrons; a method and apparatus for detection of neutrons in high backgrounds of gamma rays; a method and apparatus having high sensitivity and / or high gamma discrimination; a method and apparatus including a given single material that can detect fast neutrons and simultaneously detect gamma rays with moderate energy resolution. Liquid, viscous liquid, gel, and / or solid scintillating materials. A scintillating matrix, such as a liquid, having a highly polar matrix, such as a liquid solvent, dissolved dyes, and a high concentration of a dissolved organo metallic compound. The use of a single material for a large area detector of fast neutrons and gamma rays can provide material and cost benefits.

A large area position-sensitive single-photon detector and radiation detector is described. Photon detectors are coupled to a large area panel configured with an equipotential feedthrough chamber that operates in combination with a photocathode of a hemispherical window to provide electrostatic focusing for the photoelectrons. The panels can be assembled into an enveloping structure, such as a PET scanner, which is globally and / or locally curved, such as into a sphere, ovoid, elongated cylinder, or similar structure providing significant sensitive surface surrounding an object, such as a patient being scanned in a medical positron emission tomography (PET) scanner. Increased sensitivity is provided in response to registering radiation by surrounding the patient, so that reduced patient radiation dosing levels are required.

The invention provides a microwave-based intelligent traffic behavior perception method and system. The intelligent traffic behavior perception method includes: a traffic parameter setting step, a road traffic background learning step, a road background noise suppression step, a calculation step, a coordinate system establishment step, The vehicle type classification step, the tracking processing step, and the triggering alarm step. The beneficial effects of the present invention are: the present invention proposes a microwave (millimeter wave)-based system that can operate around the clock, has high precision, high reliability, large-area detection, high economic benefit and cost ratio, easy installation, and multi-dimensional A method and system for comprehensive traffic behavior analysis of various vehicles in the detection area. At the same time, background noise suppression is performed through a two-dimensional radar image method for some road barriers such as isolation belts or metal railings that will affect radar performance.

The invention discloses a large-area detector system based on a micro-channel plate, which is used for enlarging the area of a detector by designing the micro-channel plate, so as to shorten the outline recovery time of a pulsar and improve the sensitivity of the detector. A micro-channel plate component, a scintillator detector, a collection and control module and high-voltage modules are arranged in a housing; tantalum pieces are mounted on four side walls of the housing; a sealing door and an open mechanism thereof are arranged on the housing; the micro-channel plate component comprises an input window, a collimator, a first high-voltage electrode, a second high-voltage electrode, a photocathode, an MCP group, a third high-voltage electrode, a charge collection anode and a high-voltage ground plane which are arranged from the top to the bottom in sequence; the scintillator detector is arranged below the charge collection anode; the collection and control module is used for conducting anti-coincidence judgment on received electric signals, and sending photon arrival time of signals subjected to anti-coincidence judgment to a satellite platform for processing; the high-voltage modules are used for providing a high-voltage power supply for the micro-channel plate component and the scintillator detector.

A medical imaging tool is described, capable of providing in real time 2-D images of the prompt gamma fields released during patient treatment. Owing to its millimetre position accuracy, the instrument is particularly suited for applications where a precise determination of the end-of-range (Bragg peak) of the beam is of paramount importance, as in cancerous and non-cancerous targets for treatment with ion beams and for the treatment of atrial fibrillation. With its unique dual-layer conception in coincidence, the instrument has high rejection ability against false neutron-generated counts, the principal source of background noise for in-beam dose monitoring. It can also provide a coarse measurement of the gamma incidence angle, permitting a correction of the parallax error, main source of dispersion for large area detectors employing collimators.

Various approaches are discussed for using four-side buttable CMOS tiles to fabricate detector panels, including large-area detector panels. Fabrication may utilize pads and interconnect structures formed on the top or bottom of the CMOS tiles. Electrical connection and readout may utilize readout and digitization circuitry provided on the CMOS tiles themselves such that readout of groups or sub-arrays of pixels occurs at the tile level, while tiles are then readout at the detector level such that readout operations are tiered or multi-level.