226results about How to "Improved energy resolution" patented technology

A gamma camera comprising:

a plurality of pixelated detectors wherein each pixelated detector provides a detector signal responsive to photons that are incident on it;

a plurality of processing circuits that receive said detector signals and provide processed signals responsive to said detector signals; and

at least one printed circuit board on which said processing circuits are mounted and having conductors thereon that carry said detector signals to said processing circuits;

wherein said processing circuits are mounted on said printed circuit board at locations remote from said detectors; and

wherein said plurality of pixelated detectors form a two-dimensional planar array.

The present invention is directed to a system, method and software program product for implementing 3-D Complete-Body-Screening medical imaging which combines the benefits of the functional imaging capability of PET with those of the anatomical imaging capability of CT. The present invention enables execution of more complex algorithms measuring more accurately the information obtained from the collision of a photon with a detector. The present invention overcomes input and coincidence bottlenecks inherent in the prior art by implementing a massively parallel, layered architecture with separate processor stacks for handling each channel. The prior art coincidence bottleneck is overcome by limiting coincidence comparisons to those with a time stamp occurring within a predefined time window. The increased efficiency provides the bandwidth necessary for increasing the throughput even more by extending the FOV to over one meter in length and the execution of even more complex algorithms.

The invention discloses a digital logarithm gamma energy spectrometer, which comprises a NaI crystal, a photomultiplier, a high-voltage power supply module, a preamplifier, a logarithmic amplifier, a gain-programmed amplifier, an anti-aliasing active filter, a high-speed analog-digital converter (ADC) and a CPLD programmable logic device, wherein the logarithmic amplifier performs logarithmic operation on received nuclear pulse signals to acquire a high energy section spectral line and a low energy section spectral line; the high-speed analog-digital converter (ADC) performs analog-digital conversion on filtered signals; and the CPLD programmable logic device realizes pulse amplitude analysis, baseline restoration and filtering de-noising to digital signals, and obtains information on corresponding nuclear pulse peak values. The logarithmic amplifier performs logarithmic compression on the nuclear pulse signals to ensure the resolution of the high energy spectral line and the low energy spectral line; and the high-speed analog-digital converter and the CPLD programmable logic device are adopted to realize a digital energy spectrometer and ensure the high counting pass rate and the energy resolution of the energy spectrometer.

The invention belongs to the field of plasma diagnosis computer processing, in particular to a processing method and device for multi-channel energy spectrum measurement. The processing method includes the following steps: collecting a pulse signal sent by a probe and converting it into a digital pulse signal; counting and classifying the digitized pulse signal to obtain a count spectrum; converting the count spectrum into an energy spectrum; The energy attenuation produced by the beryllium foil is reduced, and the energy spectrum obtained in the third step is restored; the energy spectrum after reduction is smoothed and peaked and fitted to obtain the electron temperature. The processing device includes a pulse signal generation module, a high-speed acquisition card, an analog/digital signal conversion module, a high-speed cache module, and a processor unit with an energy counting module and a temperature calculation module. The problems of common multi-channel energy spectrum measurement and processing methods, such as high hardware cost, strong equipment specificity, limited number of energy channels, low spatial and temporal resolution, and inability to save original signals, are solved.

A multi-element electrostatic chicane energy filter, with the addition of electrostatic quadrupole and hexapole excitations to the dipole elements. A charged particle energy filter according to the present invention with a combination of dipole, quadrupole, and hexapole elements capable of producing a line focus at an aperture reduces space-charge effects and aperture damage. A preferred embodiment allows the filter to act as a conjugate blanking system. The energy filter is capable of narrowing the energy spread to result in a smaller beam.

A light receiver for detecting incident time is installed on the side of a radiation source of a scintillator (including a Cherenkov radiation emitter), and information (energy, incident time, an incident position, etc.) on radiation made incident into the scintillator is obtained by the output of the light receiver. It is, thereby, possible to identify an incident position and others of radiation into the scintillator at high accuracy.

An ultra high-resolution radiation detector and method for fabrication thereof, has a detector chip, comprising the so-called drift rings and an amplifier integrated with the diode component, centrally located n-type anode on one surface, the depletion region. The detector chip has a circular field of view, the depletion region which also has a circular field of view by ion implanting symmetrical p-n junctions on the surface of the radiation entrance side of the detector chip, said centrally n-type anode located on the opposite surface of the depletion region, and its position is in the region which outer of the depletion region, said centrally n-type anode was surrounded by a plurality of p-type drift electrode rings, which have an gibbous circularity topology; wherein the focus of said p-type drift electrode rings is the position of the anode, said FET (Field-Effect Transistor) was integrated in the position of the detector's anode and directly coupled to the detector's anode. The p-type drift electrode rings is a plurality of drift rings which have gibbous circularity topology, wherein the gibbous circularity topology is encircled by a majority of a large circularity and a small circularity, wherein the maximum of the depletion region is the opposite surface of the region encircled by the outermost p-type drift electrode ring.

The invention discloses a CdZnTe planar detector surface treatment method and is to solve the technical problem of poor energy resolution of a planar detector obtained after processing of an existing planar detector surface treatment method. The technical scheme is characterized by, after corrosion of a CdZnTe wafer, carrying out passivation on the surface of the CdZnTe wafer through a (NH4)2S solution; carrying out cleaning after passivation through deionized water; and finally, plating an Au electrode onto the two surfaces of the wafer through a vacuum evaporator. Through the passivation method, a Te-rich layer is removed, a CdS layer is deposited on the surface of the wafer, and stoichiometric ratio is improved, thereby reducing scattering of electrons on the surface of the crystal; dangling bonds formed after corrosion are neutralized, thereby reducing leak current on the surface of the CdZnTe wafer, improving energy resolution and improving detection efficiency of the CdZnTe planar detector; and through test, the energy resolution of the CZT planar detector is improved from original energy resolution larger than 6.5% to energy resolution smaller than 4.5%.

The invention discloses a radiation detector and a radiation detection device comprising the radiation detector. The radiation detector comprises a semiconductor crystal used for sensing radiation, a first anode arranged on the top surface the semiconductor crystal, a second anode arranged on the bottom surface of the semiconductor crystal, and one cathode on at least one side face of the semiconductor crystal. The semiconductor crystal comprises the top surface, the bottom surface and at least one side face. The radiation detection device comprises the radiation detector and a signal processing circuit. The radiation detector achieves the feature of singly-charged flexibility by utilizing the double-anode structure which is simple, and energy resolution is improved.

With a pulse-height analyzer, a reference-pulse generator generates a reference pulse of a given pulse height for a given period of time when an analog radiation pulse inputted to a comparator is higher than an initial threshold. A capacitor and a resistor receive the reference pulse, and then increase an increment threshold for the given period of time from the initial threshold to the given pulse height. Then the increment threshold is set as a reference voltage of the comparator. A pulse time width of the analog radiation pulse is determined through measuring a period of time from timing where the analog radiation pulse exceeds the initial threshold to timing where the analog radiation pulse being attenuated falls below the increment threshold.

A superconducting radiation detector uses the abruptness of a superconducting transition edge, converts a slight heat generated by an X-ray into a high signal current, and uses an electrothermal self-feedback mechanism, thereby having a high energy resolution and a high counting rate. In a calorimeter that includes an absorber for absorbing X-rays, a resistor provided under the absorber, a resistance value thereof being changed by heat generated in the absorber, superconducting wires connecting the resistor and an external current detector, and a membrane on which the resistor is superimposed, the resistor being constituted by a superconductor, the calorimeter allowing Joule heat generated by steadily flowing a current in the resistor and the heat generated in the absorber to be thermally balanced and transfer in the membrane, an insulating film is provided between the resistor and the absorber, the film having a hole penetrating the film in the thickness direction.

The invention relates to a cerous ion-doped rare earth silicate polycrystal material and a preparation method thereof, which is characterized in that the rare earth silicate is lutecium silicate, yttrium silicate or lutecium and yttrium silicate; the mol percentage of the doped cerous compound is 0.2 percent to 2 percent; the general formula of the doped rare earth silicate is Ln<2(1-x)>Ce2xSiO3, wherein, x is equal to0.002 to 0.02, and Lu is one or two types of Y and Lu. The doped cerous compound is Ce2(CO3)3, Ce(NO3)3, Ce2(C2O4)3, Ce(CH3COO)3 or Ce(OH)3. The polycrystal material is directly synthesized or prepared by doping the cerous compound and liquid-phase mixing. The invention most reduces the introduction of Ce<+4> raw material, eliminates the quenching impact of the Ce<+4> on the luminescence of Ce<+3>, reduces the sintering temperature of the polycrystal material, and improves the scintillation properties of the material, such as light output, energy resolution and the like.