36 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 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 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.

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 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 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 portable radiation dosimeter and dosage monitoring equipment, and belongs to the technical field of radioactivity detection instruments. The portable radiation dosimeter comprises a CZT (chemoreceptor trigger zone) detector, a signal processing system and a shielding case. The CZT detector is coupled with the signal processing system, the CZT detector and the signal processing system are both arranged in the shielding case, the signal processing system is used for conducting amplification, forming and screening treatment and outputting the electric signal output by the CZT detector, and the shielding case is made from a metal material. The outstanding detection efficiency is ensured by adopting the CZT detector. In addition, the signal processing system is adopted to conduct amplification, forming and screening treatment on the electric signal output by the CZT detector, accordingly the amplitude, pulse width and the like of the output signal can be changed,so that the dosage linearity of the portable radiation dosimeter and the dosage monitoring equipment is improved. The shielding case can protect the CZT detector and the signal processing system frombeing disturbed by outside electromagnetic signals, and thus the accuracy of the radiation dose rate can be improved.