37 results about "Czt detector" patented technology

A method for simultaneous transmission x-ray computed tomography (CT) and single photon emission tomography (SPECT) comprises the steps of: injecting a subject with a tracer compound tagged with a gamma-ray emitting nuclide; directing an x-ray source toward the subject; rotating the x-ray source around the subject; emitting x-rays during the rotating step; rotating a cadmium zinc telluride (CZT) two-sided detector on an opposite side of the subject from the source; simultaneously detecting the position and energy of each pulsed x-ray and each emitted gamma-ray captured by the CZT detector; recording data for each position and each energy of each the captured x-ray and gamma-ray; and, creating CT and SPECT images from the recorded data. The transmitted energy levels of the x-rays lower are biased lower than energy levels of the gamma-rays. The x-ray source is operated in a continuous mode. The method can be implemented at ambient temperatures.

A method of examining a patient is provided. The method includes aligning a patient table in an opening of a gantry unit that includes a CZT photon detector and an x-ray source, imaging a patient utilizing a first imaging modality during a first portion of a scan using the CZT detector, and imaging a patient utilizing a second imaging modality during a second portion of the scan using the CZT detector wherein the second imaging modality is different than the first imaging modality.

A semiconductor radiation detector is provided for improved performance of pixels at the outer region of the crystal tile. The detector includes a semiconductor single crystal substrate with two major planar opposing surfaces separated by a substrate thickness. A cathode electrode covers one of the major surfaces extending around the sides of the substrate a fraction of the substrate thickness and insulated on the side portions by an insulating encapsulant. An exemplary example is given using Cadmium Zinc Telluride semiconductor, gold electrodes, and Humiseal encapsulant, with the side portions of the cathode extending approximately 40-60 percent of the substrate thickness. The example with CZT allows use of monolithic CZT detectors in X-ray and Gamma-ray applications at high bias voltage. The shielding electrode design is demonstrated to significantly improve gamma radiation detection of outer pixels of the array, including energy resolution and photopeak counting efficiency. The detector has performance of detector leakage current density less than 6 nA / mm2 at a bias potential of substantially 1400V, and responsive to gamma radiation such that the energy resolution full width half maximum of more than 90% of the pixels is less than 6%.

The invention belongs to the technical field of radioactive detection instruments, and specifically provides a portable gamma spectroradiometer. The portable gamma spectroradiometer comprises a power supply system (4), a detector system (5) and a signal processing system (6), wherein the detector system (5) comprises two single-layer CZT detectors (1) which are laminated together up and down; the electric signals of the two single-layer CZT detectors (1) are connected into the signal processing system (6) after being connected in parallel; the power supply system (4) is connected with the detector system (5) and is used for supplying power for a laminated CZT detector consisting of the two single-layer CZT detectors (1). The portable gamma spectroradiometer overcomes the problems that the efficiency of a single detector is not high and the precision of a final dosage value is not high caused by the fact that a portable gamma spectroradiometer in the prior art uses the single CZT detector in a single energy spectrum analysis manner.

The invention discloses a gamma-spectrum detection system consisting of an antimony zinc cadmium detector and used for measuring burn-up of a spent fuel assembly. The system comprises a CZT detector, a digital multi-channel analyzer, a shielding aligner, a shield, a pressure-resistant sealing container and the like, wherein the shielding aligner is a cylinder; a conical groove is formed on an upper part of the shielding aligner; a movable slider is arranged in the conical groove; the movable slider is dragged by a step motor through a screw to move up and down; and the width of an alignment hole is controlled to be 0-5 mm. The system controls the width of the alignment hole by adjusting the movable slider so as to control a full-spectrum counting rate of a detected energy spectrum within a proper range and obtain relatively high measurement precision. Meanwhile, the measuring system is relatively compact and is favorable to be freely moved in a spent fuel assembly storage pool for in situ measurement.

A method of examining a patient is provided. The method includes aligning a patient table in an opening of a gantry unit that includes a CZT photon detector and an x-ray source, imaging a patient utilizing a first imaging modality during a first portion of a scan using the CZT detector, and imaging a patient utilizing a second imaging modality during a second portion of the scan using the CZT detector wherein the second imaging modality is different than the first imaging modality.

The invention relates to a device and method for a radioactive surface source to automatically imitate and mark gas source detection efficiency. The device comprises a radioactive source tray, at least two supporting columns, at least two sleeve pipes, a base, air leakage holes, a surface source and a CZT detector. The middle of the radioactive source tray is hollow, the lower bottom face of the radioactive source tray is fixedly connected with the at least two supporting columns, the middle of the base is hollow, the upper top face of the base is fixedly connected with the sleeve pipes, the supporting columns and the sleeve pipes are equal in number and corresponding in position in a one-to-one mode, and the external diameter of each supporting column is precisely equal to the internal diameter of each sleeve pipe. According to the device and method for the radioactive surface source to automatically imitate and mark the gas source detection efficiency, the gravity of the radioactive source tray and the gravity of the supporting columns are simply used as a power source without the help of other external forces, the surface source can automatically mark a gas source, a closed space formed by the supporting columns and the sleeve pipes is used, one air leakage hole is formed in the space to be used for air exhaust, and meanwhile, the influence of the air leakage hole to the decline of the tray and the supporting columns is eliminated due to the fact that the air leakage hole is formed in the base.

The invention belongs to a radiation detection device, in particular relates to a current type cadmium zinc telluride (CZT) detector with a compression joint structure and solves the technical problems of poor packaging structure of the CZT detector under the limited process and technical conditions, increase of leakage current, infirmness of electrodes, high preparation difficulty, instable performance, low customized product processing rate and the like of the packaged CZT detector. The current type CZT detector comprises a shielding shell, two cable adapters which are arranged outside the shielding shell, a through hole which is formed in the shielding shell, and a CZT crystal, conductive gasket rings, the electrodes and pressing covers, which are arranged in the through hole, wherein conductive layers are coated on the surface of two sides of the CZT crystal; the conductive gasket rings, the electrodes and the pressing covers are divided into two groups and symmetrically distributed on the two sides of the CZT crystal; the conductive gasket rings are respectively contacted with the two sides of the CZT crystal; the electrodes are contacted with the corresponding conductive gasket rings; and the pressing covers are used for fixing the electrodes and the conductive gasket rings into the shielding shell and pressed against the CZT crystal. The current type CZT detector is high in detection efficiency and detection sensitivity, and stable and reliable in performance.

The invention relates to a position energy time testing device based on a CZT detector. The testing device at least comprises a scintillation crystal array, one or more pixel detectors, a dedicated readout ASIC. The dedicated readout ASIC is capable of determining relative time information of ray action detectors corresponding to a plurality of scintillation cases detected by each pixel detector respectively by utilizing a determined corresponding relation between electronic pulses provided by the pixel detectors and the luminous intensity of scintillation light generated by the scintillationcrystal array under the incidence of radiation particles at a multi-pixel energy spectrum detector module level, focusing the plurality of scintillation cases from a single gamma photon, performing time coincidence logic processing to discriminate effective scintillation cases from Compton scattering, and outputting scintillation case information that includes relative time information, pixel energy spectrum information, and position information of the ray action detectors and are treated by time coincidence logic processing.

A system and method for a molecular breast imaging (MBI) are provided. One MBI system includes at least one cadmium zinc telluride (CZT) detector having a plurality of pixels and a registered parallel hole collimator coupled to a face of the CZT detector. The registered parallel hole collimator includes a plurality of collimator holes, wherein the plurality of collimator holes are aligned with the plurality of pixels, and the spatial dimensions of the plurality of holes are configured based on characteristics of the CZT detector and the registered parallel hole collimator.

The invention relates to a high-sensitivity splicing CZT detector and a sensitivity calibration method. The invention provides a high-sensitivity cadmium-zinc-telluride (CZT) semiconductor detector comprising a housing, an output signal circuit, and a CZT semiconductor assembly; and the housing is formed by successive and fixed connection of a front cover, a middle cylinder, and a rear cover. Therefore, the restriction on the CZT crystal dimension by the crystal growth technology can be eliminated; the sensitive volume of the pulse radiation detector can be increased; and the sensitivity range upper limit of the detector can be extended. In addition, a method for calibrating the sensitivity of the CZT detector is also provided by the invention.

A system and method for a molecular breast imaging (MBI) are provided. One MBI system includes at least one cadmium zinc telluride (CZT) detector having a plurality of pixels and a registered parallel hole collimator coupled to a face of the CZT detector. The registered parallel hole collimator includes a plurality of collimator holes, wherein the plurality of collimator holes are aligned with the plurality of pixels, and the spatial dimensions of the plurality of holes are configured based on characteristics of the CZT detector and the registered parallel hole collimator.

The invention relates to the technical field of radiation dose measurement, in particular to an energy spectrum acquisition-based portable radiation dose measuring device, which comprises a CZT detector module, a signal shaping amplifying circuit, a high-speed AD conversion circuit and a digital signal processing module, wherein the CZT detector module is used for converting particle energy information of a to-be-measured radiation field to corresponding electrical signals; the signal shaping amplifying circuit is used for amplifying the amplitude of the electrical signals outputted by the CZTdetector; the high-speed AD conversion circuit is used for continuously sampling pulse signals outputted by the signal shaping amplifying circuit and converting the pulse signals to a digital quantity for being outputted; and the digital signal processing module is used for performing amplitude information extraction and energy spectrum accumulation on the digital signal waveform outputted by thehigh-speed AD conversion circuit, and after energy spectrum accumulation is completed, based on an energy spectrum dose conversion function, the incident particle type and the radiation dose information of the to-be-measured radiation field are calculated and obtained. In comparison with the prior art, the detailed information of the particle type, the energy and the radiation dose of the to-be-measured radiation field can be provided, the circuit structure is simple and reliable, and popularization is convenient.

The invention provides a radiation residue scanning device and system and relates to the technical field of nuclear medical imaging; the device comprises a plurality of CZT (CdZnTe) detectors, a plurality of data processing units, a plurality of window acquisition circuits, a plurality of counting units and a processor; the CZT detectors are in one-to-one corresponding connection with the data processing units; the data processing units are in one-to-one corresponding connection with the window acquisition circuits; the window acquisition circuits are in one-to-one corresponding connection with the counting units, wherein each window acquisition circuit includes a plurality of acquisition modules connected in parallel, each counting unit includes a plurality of counting subunits in one-to-one corresponding connection with acquisition window modules, and the processor is connected with the counting units. Subsequent circuitry is modified for the CZT detectors, more acquisition windows are added at the premise of reducing the width of acquisition windows, and the problems of low detection efficiency and low spatial resolution is solved.

The invention discloses a gamma camera special for mammary glands based on CZT. The gamma camera comprises a main case, an overhauling cabinet door, a working table, casters, an electric pushing rod, a CZT detector, a cantilever structure, a display support and a display. The overhauling cabinet door is arranged outside the main case, the working table is arranged on one side of the upper portion of the main case, and the cantilever structure is arranged on the other side of the upper portion of the main case; the display support is arranged on the working table, the display is arranged above the display support, and the casters are arranged below the main case; the gamma camera also comprises a lifting guiding rail, the lifting guiding rail is installed above the cantilever structure, a supporting plane is installed at the bottom of the lifting guiding rail, and the CZT detector is installed above the supporting plane and is capable of being installed on the lifting guiding rail in a sliding mode. According to the gamma camera special for the mammary glands based on the CZT, a supporting face plate is arranged below the CZT detector and used for fixing and slightly extruding a breast, artificial moving of the mammary glands is prevented, the thickness of the breast is reduced, and lesion points are more easily detected through the detector.

The invention relates to a radiation detection device, particularly to a fast-time-response semiconductor radiation detector based on shortwave light injection and a method of manufacturing the same. The semiconductor radiation detector comprises a detector body including a detector front cover and a semiconductor crystal. And the semiconductor radiation detector also includes a shortwave light source arranged at the inner side wall of the detector front cover; the shortwave light source points to the center of the semiconductor crystal; and the emission angle of the shortwave light source covers the whole semiconductor crystal space region and the central wavelength of the shortwave light source is shorter than that corresponding to a semiconductor crystal energy gap. Therefore, the influence on the time response characteristic of the detector by the crystal quality can be eliminated; and a noel CZT detector having a fast time response characteristic is provided for pulse radiation field measurement.

The invention relates to a light quantum detection system, a calculation method thereof and a light quantum multi-phase bidirectional flowmeter employing the system. The light quantum detection systemcomprises an emitter and a detection module, wherein the emitter and the detection module are arranged at two sides of a throttling element, the emitter is a light quantum source and is used for emitting light quantum, the throttling element is used for a fluid to pass through, the emitter and the detection module are arranged at two sides of a throat segment of the throttling element, the detection module is a detector array and comprises a plurality of detection units arranged in a matrix form, each detection unit is used for receiving light quantum penetrating through the throttling element, and the detection units are CZT detectors. The light quantum sub-source is used as the emitter, light quantum particle with different energy is emitted, and each detection unit is used for independently measuring single photon; and with the adoption of the CZT semiconductor detector array, the light quantum detection system is small in volume and higher in energy resolution, the application ofa physical collimator can be omitted, relatively good space resolution is achieved in measurement section, so that the measurement accuracy is improved.

A medical imaging system is provided. The imaging system provides patient region-of-interest scanning using a step-staggered detector unit arrangement. A region-of-interest may be a brain. This system can be a Nuclear Medicine (NM) imaging system to acquire Single Photon Emission Computed Tomography (SPECT) image information. The imaging system may comprise CZT detector modules.

The invention relates to a portable radiation dose meter, dose monitoring equipment and a sectional treatment method and belongs to the technical field of radiation detection instruments. The portableradiation dose meter comprises a CZT detector, a signal processing system, a processor and a shielding case made of metal; and the CZT detector, the signal processing system and the processor are sequentially coupled to one another and are all arranged in the shielding case. Compared with the prior art, by adopting the signal processing system to perform amplification and formation on an electricsignal output by the CZT detector, and the electric signal after screening treatment is output to the processor for pre-processing, so that the amplitude, the pulse width and the like of the output signal can be changed to improve the dose linearity of the portable radiation dose meter and the dose monitoring equipment, and the higher detection efficiency of the portable radiation dose meter whenthe working voltage of the CZT detector is descended to the safety voltage of a human body is ensured.

A radiation residue scanning device includes a plurality of CZT detectors, a plurality of data processing units, a plurality of window acquisition circuits, a plurality of counting units, and a processor; the plurality of CZT detectors connected in one-to-one correspondence to the plurality of data processing units; the plurality of data processing units are connected in one-to-one correspondence to the plurality of window acquisition circuits; and the plurality of window acquisition circuits are connected in one-to-one correspondence to the counting units The window acquisition circuit includes a plurality of acquisition modules, and the respective acquisition modules are connected in parallel; the counting unit includes a plurality of counting subunits, the counting subunits are connected in one-to-one correspondence to the acquisition window modules, and the processor is connected to the plurality of counting units.

The invention belongs to a radiation detection device, in particular relates to a current type cadmium zinc telluride (CZT) detector with a compression joint structure and solves the technical problems of poor packaging structure of the CZT detector under the limited process and technical conditions, increase of leakage current, infirmness of electrodes, high preparation difficulty, instable performance, low customized product processing rate and the like of the packaged CZT detector. The current type CZT detector comprises a shielding shell, two cable adapters which are arranged outside the shielding shell, a through hole which is formed in the shielding shell, and a CZT crystal, conductive gasket rings, the electrodes and pressing covers, which are arranged in the through hole, wherein conductive layers are coated on the surface of two sides of the CZT crystal; the conductive gasket rings, the electrodes and the pressing covers are divided into two groups and symmetrically distributed on the two sides of the CZT crystal; the conductive gasket rings are respectively contacted with the two sides of the CZT crystal; the electrodes are contacted with the corresponding conductive gasket rings; and the pressing covers are used for fixing the electrodes and the conductive gasket rings into the shielding shell and pressed against the CZT crystal. The current type CZT detector is high in detection efficiency and detection sensitivity, and stable and reliable in performance.

A medical imaging system is provided. The imaging system provides patient region-of-interest scanning using a step-staggered detector unit arrangement. A region-of-interest may be a brain. This system can be a Nuclear Medicine (NM) imaging system to acquire Single Photon Emission Computed Tomography (SPECT) image information. The imaging system may comprise CZT detector modules.

The invention discloses a gamma-spectrum detection system consisting of an antimony zinc cadmium detector and used for measuring burn-up of a spent fuel assembly. The system comprises a CZT detector, a digital multi-channel analyzer, a shielding aligner, a shield, a pressure-resistant sealing container and the like, wherein the shielding aligner is a cylinder; a conical groove is formed on an upper part of the shielding aligner; a movable slider is arranged in the conical groove; the movable slider is dragged by a step motor through a screw to move up and down; and the width of an alignment hole is controlled to be 0-5 mm. The system controls the width of the alignment hole by adjusting the movable slider so as to control a full-spectrum counting rate of a detected energy spectrum within a proper range and obtain relatively high measurement precision. Meanwhile, the measuring system is relatively compact and is favorable to be freely moved in a spent fuel assembly storage pool for in situ measurement.

The invention relates to a device and method for a radioactive surface source to automatically imitate and mark gas source detection efficiency. The device comprises a radioactive source tray, at least two supporting columns, at least two sleeve pipes, a base, air leakage holes, a surface source and a CZT detector. The middle of the radioactive source tray is hollow, the lower bottom face of the radioactive source tray is fixedly connected with the at least two supporting columns, the middle of the base is hollow, the upper top face of the base is fixedly connected with the sleeve pipes, the supporting columns and the sleeve pipes are equal in number and corresponding in position in a one-to-one mode, and the external diameter of each supporting column is precisely equal to the internal diameter of each sleeve pipe. According to the device and method for the radioactive surface source to automatically imitate and mark the gas source detection efficiency, the gravity of the radioactive source tray and the gravity of the supporting columns are simply used as a power source without the help of other external forces, the surface source can automatically mark a gas source, a closed space formed by the supporting columns and the sleeve pipes is used, one air leakage hole is formed in the space to be used for air exhaust, and meanwhile, the influence of the air leakage hole to the decline of the tray and the supporting columns is eliminated due to the fact that the air leakage hole is formed in the base.

The invention relates to a polarization measuring device based on a CZT detector, comprising a CZT detection device, a ray generating device and a polarizing device. The generating device can change the relative angle between it and the polarizing device while keeping the distance between it and the polarizing device constant by rotating it on the circular moving platform relative to the polarizing device. In the case of a CZT detection device, the incident angles formed by the polarized light with different scattering angles relative to the arc energy spectrum detection module are the same, so that the polarization degree measurement device can meet the requirements of polarized light with different scattering angles in the arc energy spectrum. Under the condition of having the same detection efficiency on the spectrum detection module, it is not necessary to change the distance between the radiation source and the polarizer to keep the energy loss of the radiation source in the air propagation process in multiple measurements consistent. Polarization measurement.

The invention discloses a technical method and device for inversing the positions and boundaries of virtual points in a pollution area. The technical device comprises a hot area virtual point source, sandy soil, a sandy soil attenuation layer, a detector, a virtual point detector, a surface source, a virtual point source of the surface source, the ground, and air, and the virtual point source is a virtual point source of a body source, a surface source, or a mixed source. The emitted rays can reach the detector only after passing through the sandy soil, the ground and the air, the sandy soil is buried deep sandy soil of a virtual point source, the position of the sandy soil is between the virtual point source and the detector, an equation set is established by utilizing the principle of the effective pre-area of the in-situ HPGe gamma spectrometer, the position of the virtual point is obtained by solving the equation, and therefore the boundary parameters of the polluted area are further inverted. The method is high in practicability, the CZT detector is used, the CZT detector is high in density and small in size, the CZT detector can be regarded as a point detector at the distance of 1.0 m, an equation set is established by means of two sandy soil attenuation layers consistent with a target object, and the purpose of measuring target parameters is achieved.

The invention relates to a radiation detection device, particularly to a fast-time-response semiconductor radiation detector based on shortwave light injection and a method of manufacturing the same. The semiconductor radiation detector comprises a detector body including a detector front cover and a semiconductor crystal. And the semiconductor radiation detector also includes a shortwave light source arranged at the inner side wall of the detector front cover; the shortwave light source points to the center of the semiconductor crystal; and the emission angle of the shortwave light source covers the whole semiconductor crystal space region and the central wavelength of the shortwave light source is shorter than that corresponding to a semiconductor crystal energy gap. Therefore, the influence on the time response characteristic of the detector by the crystal quality can be eliminated; and a noel CZT detector having a fast time response characteristic is provided for pulse radiation field measurement.

The invention relates to a position energy time testing device based on a CZT detector, which at least includes: a scintillation crystal array, one or several pixel detectors, and a dedicated readout ASIC, wherein, by using the determined pixel detector The corresponding relationship between the provided electronic pulse and the luminous intensity of the scintillation light generated by the scintillation crystal array under the incidence of radiation particles, at the level of the multi-pixel energy spectrum detector module, the dedicated readout ASIC can detect each The multiple scintillation events detected by the pixel detector respectively determine the relative time information of the corresponding ray-action detector, and gather multiple scintillation events from a single gamma photon, and perform temporal logic processing to identify those from Compton scattering The effective scintillation event of , output the scintillation event information including the relative time information of the ray action detector, the pixel energy spectrum information and the position information, and the time logically processed scintillation event information.

The invention discloses a space charged particle telescope based on cadmium zinc telluride. The top of the outer cover is provided with an opening, the outer cover is provided with a mounting seat, and the mounting seat is provided with a Si semiconductor detector, a first CZT detector and a second CZT The detector, the Si semiconductor detector and the first CZT detector form a first group of ΔE‑E detector systems, the first CZT detector and the second CZT detector form a second group of ΔE‑E detector systems, and the first group ΔE The ‑E detector system and the second group of ΔE‑E detector systems work together to measure charged particles of different energies. The invention can measure components such as charged particles, thermal neutrons and gamma rays in the space environment. It can effectively measure the linear energy transfer (LET), equivalent dose, charged particle energy spectrum, total dose, dose rate and other information of charged particles in space, which is of great significance for astronaut radiation risk assessment. Compared with traditional scintillation The crystal system can improve the resolution of particle energy spectrum and enhance the ability of particle identification.