34 results about "Gamma camera" patented technology

The invention relates to a multi-modal medical image analysis method and device for cancer diagnosis. The method comprises the following steps: converting a two-dimensional projection sequence of an intraoperative gamma camera into an initial three-dimensional radioactive distribution voxel field through Radon inverse transformation; performing spatial registration by combining a tumor segmentation mask in the preoperative image to obtain a registered image; positioning a hole defect area based on the registration image and the initial three-dimensional radioactive distribution voxel field; generating a multi-modal constraint matrix and a coherence parameter optimization value through anatomical weighted continuous coherence modeling, and then correcting an initial distribution voxel field; fusing the corrected voxel field and the registered image to generate an initial boundary map and confidence; and judging whether to adjust the coherence parameter and regenerate the boundary diagram according to the confidence coefficient. By adopting the method, the problem of projection data missing caused by limitation of the rotation angle of the gamma camera in the operation can be effectively solved, topological structure distortion of a traditional reconstruction algorithm is avoided, and the accuracy and reliability of the cancer infiltration boundary diagram are improved.

A method includes accumulating counts for each pixel in a set of pixels of one or more gamma cameras of a SPECT imaging system from a plurality of imaging examinations and each energy peak of each isotope used in the plurality of imaging examinations to produce an energy spectrum for each of the pixels at each of the energy peaks of each of the isotopes, determining, for the pixels and for the energy peaks, an energy calibration factor that converts an energy detected by each of the pixels to an energy of a corresponding energy peak and populating an energy map with the factors, and determining, for the pixels and for the energy peaks, a uniformity calibration factor that converts a number of counts detected by each of the pixels to a predetermined number of counts for a corresponding energy peak and populating a uniformity map with the factors.

The invention discloses a hybrid gamma imaging method, system and device and a medium, relates to the technical field of gamma imaging, and solves the problems of low imaging performance and applicability of wide-energy-band gamma ray imaging. According to the method, a key parameter value, namely the number of sub-iterations required by a hybrid imaging method for reconstructing gamma images with different energies, can be automatically calculated, the hybrid gamma image reconstruction method is adopted, the method is suitable for an iterative image reconstruction mode, calculation is carried out according to an active coding case and a Compton case in the iteration process, and the calculation efficiency is improved. According to the method, the active coding and the Compton imaging modes are combined, and weighted summation is carried out on respective calculation results, so that the imaging performance of the gamma camera and the applicability to wide-energy-band gamma ray measurement are effectively improved, and high-performance gamma imaging with high imaging resolution and high detection sensitivity is realized.

The utility model discloses a gamma camera, a detector and a CT machine. The gamma camera comprises a scintillator, a collimator, an S < iPM > array, a signal transmission unit, an analog-to-digital conversion unit and a data processing unit. The collimator is arranged in the light incident direction of the scintillator, comprises N light through holes arranged in a matrix manner, and is used for shielding non-vertical incident rays; the S iPM array is matched with the scintillator and the collimator to ensure that photons excited by rays emitted from each light through hole after passing through the scintillator are captured by at least one S iPM; the analog-to-digital conversion unit comprises a Q-V conversion circuit, a single-ended-differential voltage conversion circuit, a differential voltage amplification circuit and an AD conversion circuit, so that a two-stage integrator and a converter are formed, and the signal precision is improved; and the signal transmission unit can adopt a multi-channel connector or a diode array, so that resource occupation is reduced. The detector is formed by splicing gamma cameras into a whole ring and is applied to a CT machine, high-precision detection can be achieved under low-dose rays, and the imaging resolution ratio and accuracy are improved.

An embodiment of the invention relates to a method for estimating a dose rate based on measurements performed by a gamma camera (2), the gamma camera defining an observation field (Ω), the estimated dose rate originating from a radiation source (10 a , 10 b ), these radiation sources emit ionizing electromagnetic radiation; the observation field is discretized into a grid; the gamma camera (2) includes pixels (2 j ), each pixel being configured to detect ionizing electromagnetic radiation during an acquisition time and thereby forming an energy spectrum, each pixel being associated with at least one point of a grid, said pixels together allowing to obtain the position of a radiation source in an energy band or in a plurality of energy bands in the observation field; the method comprising estimating a dose rate produced on a gamma camera by a point of the grid.

A radiation source identification system using Compton image projection in a three-dimensional virtual space, according to the present invention, comprises: a gamma image generation module that includes a gamma camera and generates 4-pi full-solid-angle Compton image data; an indoor positioning module that includes a plurality of fixed beacons and one mobile beacon and generates coordinates of the mobile beacon; a rotating support module that includes a fixed plate on which the mobile beacon of the indoor positioning module and the gamma image generation module are mounted, and a driving control device that rotates the fixed plate according to an input directional angle; and an integrated data management module that stores and manages a three-dimensional building information model that depicts each facility of a nuclear facility as a three-dimensional object in a three-dimensional virtual space, converts the coordinates of the indoor positioning module and the directional angle of the rotating support module into reference coordinates and a reference direction in the three-dimensional virtual space, respectively, receives the Compton image data of the gamma image generation module, aligns same to the reference coordinates and the reference direction to project same, and identifies a radiation source.

A method of improving a generated image obtained from a gamma camera for medical imaging, the image being improved by excluding the contribution of low-energy and scattered gamma rays to the generated image, the method comprising the steps of: detecting gamma ray photons by the gamma camera; converting the detected gamma ray photons into one or more optical photons; detecting the resulting optical photons on the photosensitive surface; processing the detected optical photons into a primary data array comprising pixels, where the pixels map the detection of the optical photons on the photosensitive surface, where the filling pixels correspond to the detection of the optical photons on the photosensitive surface; identifying a cluster of padding pixels in the primary data array; determining a density of fill pixels in the identified clusters; classifying the clusters into high-density clusters (clusters with high-density filled pixels) and low-density clusters (clusters with low-density filled pixels); the contributions of low-density clusters to the generated image are excluded, the low-density clusters corresponding to low-energy and scattered gamma rays.

This disclosure provides a gamma camera with a collimation unit, applicable to the field of detection technology. The gamma camera includes at least one detection unit, comprising: a collimation unit comprising multiple needle-type collimator arrays arranged alternately, each needle-type collimator array comprising multiple arrayed needle-type collimators whose length directions point in the same direction, with the length directions of the needle-type collimators in different arrays pointing in different directions; multiple scintillation crystal units for detecting gamma photons penetrating the collimation unit along different directions, generating multiple sets of scintillation light signals; and multiple photoelectric conversion units, each coupled to a scintillation crystal unit, for converting the multiple sets of scintillation light signals into multiple sets of electrical signals for imaging by the gamma camera.

The utility model discloses a portable gamma camera capable of switching a collimator in the technical field of portable gamma cameras, which comprises a base, the upper end of the base is fixedly connected with a connecting column, the upper end of the connecting column is fixedly connected with a gamma camera main body, the front side of the gamma camera main body is provided with a gamma camera lens column, and the front side of the gamma camera main body is provided with a camera lens. A gamma camera lens column is arranged on the base, a collimator body is arranged on the front side of the gamma camera lens column and connected with the gamma camera lens column through a butt joint device, a sliding groove is formed in the side wall of the base in a penetrating mode, a storage drawer is connected into the sliding groove in a sliding mode, and the storage drawer is connected with the base through a connecting device. A plurality of other collimator main bodies are accommodated in the accommodating drawer, and a plurality of positioning devices are arranged at the inner bottom of the accommodating drawer in a penetrating manner. The utility model has the advantages that the collimator main body is convenient to replace by an operator, the butt joint is stable, and the storage is convenient.

The application discloses a kind of based on coding aperture technology and laser radar's radioactive source quantification imaging method, its steps include: 1) using coding aperture gamma camera obtains the coding projection and energy spectrum of radioactive source in target area, and decoding calculation is carried out to coding projection to obtain coding reconstruction image O;2) obtaining the radiation hot spot in image O, generates radiation hot spot image;3) according to energy spectrum, the full energy peak E of radioactive source is identified, and the dose rate at the position where camera is calculated;4) by laser radar, the three-dimensional point cloud information of the target area is acquired, and the optical video information of target area is acquired by optical camera;Then according to azimuth, the pixels in radiation hot spot image, optical video information, three-dimensional point cloud information are matched and fused;5) find the three-dimensional point cloud pixel corresponding to radiation hot spot in fusion map;According to the three-dimensional point cloud pixel corresponding to radiation hot spot, the distance between radiation source and camera is obtained;6) inversion calculation obtains the activity value of radioactive source.

1. Name of the product in this design: Scintillation Detector. 2. Application of this design: This design is mainly used in fields such as nuclear medicine imaging, high-energy physics, environmental monitoring, security inspection, and gamma cameras for detecting the energy spectrum or position of X-rays or gamma rays. 3. The key design feature of this product is its shape. 4. The image or photograph that best illustrates the key design points: Design 1 3D view. 5. Design 1 is designated as the basic design.

To provide a method for testing a semiconductor sensor of a gamma camera.SOLUTION: In order to test or manufacture a semiconductor-based detector in SPECT, an interposer 106, such as an elastomer device with a conductor, is sandwiched between a carrier and a semiconductor detector, the conductor enables temporary, separate connection of a detector electrode to a signal processing circuit, to test the detector operating using the signal processing circuit, and the interposer 106 provides separate electrical connection for testing.SELECTED DRAWING: Figure 1

A molecular imaging method for guidance in biopsy or surgical procedures includes selecting and inputting two different slant angles for stereotactic molecular imaging of a hot spot, positioning a patient to whom a radiotracer has been administered in a molecular imaging system including a solid-state gamma camera and a variable-angle square hole (VASH) collimator, acquiring two stereotactic molecular images with the VASH collimator, each of the two stereotactic molecular images being acquired when the VASH collimator is adjusted to a different one of the two different slant angles, calculating a 3D position of a hot spot, and performing a molecular image-guided biopsy procedure on the basis of the calculated 3D position. In acquiring the two stereotactic molecular images, the VASH collimator is positioned such that the two different slant angles are in a plane generally parallel (that is, within 30 degrees of parallel) to a coronal plane of the patient.

The present application relates to the technical field of nuclear power plant radiation monitoring, and particularly relates to a nuclear power plant radiation heat source three-dimensional visualization method, aiming at the problems of low positioning efficiency of radiation hot spots in complex scenes and high-precision scanning of laser radar in multi-modal data fusion in the prior art, the present application synchronously collects three-dimensional point cloud and radiation image data through laser radar and coded aperture gamma camera, realizes accurate alignment of cross-modal data by using a feature point coordinate system transformation algorithm, fuses optical images, radiation intensity and three-dimensional space depth information, and generates a three-dimensional visualized scene with color gradient. The method can present the position, distribution and environmental relationship of the radiation hot spot in real time, and the positioning accuracy reaches millimeter level, and is suitable for complex scenes such as dense pipelines. The present application solves the defects of high dependence on the precision of a single device and insufficient real-time performance of the traditional scheme, and provides efficient and intuitive technical support for safe operation of nuclear power.

A method of reconstructing the position of a source using a gamma camera. The gamma camera combines two imaging modalities: a coded mask imaging modality and a Compton imaging modality. The method comprises the selection of at least one isotope, the reconstruction being carried out according to a Bayesian probabilistic approach, taking into account each selected isotope.

A gamma radiation imaging system for imaging of both the left and right breast of a female person simultaneously. The system comprises a frame, a left breast imaging assembly and a right breast imaging assembly supported by the frame. Each imaging assembly comprises a set immobilization plates and at least a gamma camera. Seen in an anatomical frontal view of the torso of the female person, the left and right breast imaging assemblies are supported by the frame in a downward pointed V-arrangement.

A gamma camera and imaging method are disclosed. The gamma camera comprises a detection module comprising a multi-layered detection structure, each layer comprising multiple detection units, each configured to receive incident gamma photons and generate projections of the gamma photons. An image reconstruction module, adapted to different imaging requirements, selects portions of the projections for reconstruction, generating a three-dimensional distribution map of gamma photons that meets these requirements. After completing a single scan, the gamma camera can selectively acquire projections with higher spatial resolution, higher sensitivity, and / or different fields of view, thereby simultaneously meeting the requirements for different imaging indicators as much as possible, reducing operation time and steps.

A gamma camera device includes a collimator with pinholes which surrounds an object space for receiving an object, a detector surface for detecting gamma radiation emitted by the object and passing through pinholes of the collimator, and a controller for processing the detector signals into an image of the object. The collimator and the object space have a common longitudinal axis, wherein the collimator includes a plurality of groups each of multiple pinholes with a central line. In each group, the pinholes lie in a plane perpendicular to the longitudinal axis, wherein the pinholes of the groups together see a focus volume, which focus volume has a geometric center. Within each group, on a rotation around said longitudinal axis, the respective central line of each of said pinholes becomes congruent with the central line of each of the other pinholes of the group.

A gamma camera device comprises a collimator with pinholes, the collimator enclosing an object space for receiving an object; a detector surface for detecting gamma radiation emitted by the object and passing through the pinholes of the collimator; and a controller for processing detector signals into an image of the object. The collimator and the object space have a common longitudinal axis, wherein the collimator comprises a plurality of groups, each of a plurality of pinholes having a center line. In each group, the pinholes are located in a plane perpendicular to the longitudinal axis, wherein the pinholes of the group together see a focal volume, the focal volume having a geometric center. Within each group, upon rotation around the longitudinal axis, the respective center line of each of the pinholes becomes coincident with the center line of each of the other pinholes of the group.

A method includes accumulating counts for each pixel in a set of pixels of one or more gamma cameras of a SPECT imaging system from a plurality of imaging examinations and each energy peak of each isotope used in the plurality of imaging examinations to produce an energy spectrum for each of the pixels at each of the energy peaks of each of the isotopes, determining, for the pixels and for the energy peaks, an energy calibration factor that converts an energy detected by each of the pixels to an energy of a corresponding energy peak and populating an energy map with the factors, and determining, for the pixels and for the energy peaks, a uniformity calibration factor that converts a number of counts detected by each of the pixels to a predetermined number of counts for a corresponding energy peak and populating a uniformity map with the factors.

The invention provides a multimode iterative reconstruction method and device, and relates to the technical field of nuclear radiation detection. The method comprises the following steps: acquiring event information of interaction between gamma photons and a three-dimensional position sensitive semiconductor detection unit in a panoramic gamma camera system; based on the prior energy, the Compton scattering event count in the event information and the photoelectric absorption event count in the event information, obtaining an information amount, and calculating a weight according to the information amount; compton sequence reconstruction is carried out based on prior energy, and a multimode system transmission matrix is constructed according to the reconstructed Compton sequence; and performing multi-mode iteration reconstruction based on the weight and the multi-mode system transmission matrix, outputting a stable high signal-to-noise ratio image, and determining the spatial distribution of the radioactive source. According to the multi-mode iteration reconstruction method based on the coding aperture combined with the Compton and non-collimation technology, the problems that in traditional multi-mode gamma imaging, the reconstruction resolution ratio is poor, and the imaging signal-to-noise ratio is unstable are solved, and the imaging energy range, the imaging view field and the resolution ratio are effectively improved.

The invention relates to the technical field of nuclear power plant radiation monitoring, in particular to a nuclear power plant radiation heat source three-dimensional visualization method, and aims to solve the problems that in the prior art, multi-modal data fusion depends on laser radar high-precision scanning, and radiation hot spot positioning efficiency is low in a complex scene. Three-dimensional point cloud and radiation image data are synchronously acquired through a laser radar and a coded aperture gamma camera, cross-modal data accurate alignment is realized by using a feature point coordinate system transformation algorithm, optical image, radiation intensity and three-dimensional space depth information are fused, and a three-dimensional visual scene with color gradient is generated. The method can present the position, distribution and environment relation of the radiation hot spots in real time, the positioning precision reaches the millimeter level, and the method is suitable for complex scenes such as dense pipelines. According to the invention, the defects of high dependence on the precision of single equipment and insufficient real-time performance of the traditional scheme are overcome, and efficient and visual technical support is provided for the safe operation of nuclear power.

The invention discloses a high-resolution gamma camera and equipment applied to SPECT (Single Photon Emission Computed Tomography). The high-resolution gamma camera comprises a collimator, a scintillator array, an APD array, an analog circuit unit and a digital processing unit, wherein the scintillator array, the APD array, the analog circuit unit and the digital processing unit are sequentially coupled and connected; the collimator is used for controlling the direction of the detected gamma ray; the scintillator array is used for converting incident gamma rays into visible photons and coupling the visible photons to the APD array; the APD array is used for converting an incident light signal into an electronic charge to form an analog current signal; the analog circuit unit is used for carrying out integration and conversion processing on the analog current signal and then outputting a digital signal; and the digital processing unit is used for acquiring and processing the digital signal to form image data and transmitting the image data to an upper computer. According to the high-resolution gamma camera, the spatial resolution and the energy resolution upper limit of an image reconstructed by the SPCET equipment are improved.

Improved imaging equipment and methods. Portable SPECT imaging devices can be co-registered with imaging modalities such as ultrasound. A gamma camera panel, including a gamma camera sensor, can be attached to a robotic arm. An coded aperture mask can be placed in front of the gamma-ray photon sensor and used to construct a high-resolution 3D map of the distribution of radioisotopes within a patient, generated by scanning the patient from a narrowed perspective and placing a radiation sensor near the patient. Enhanced imaging sensitivity and resolution are provided. SPECT imaging devices can be used to guide medical interventions such as biopsies and ablation treatments, as well as to guide surgery.

A molecular imaging method for guidance in biopsy or surgical procedures includes selecting and inputting two different slant angles for stereotactic molecular imaging of a hot spot, positioning a patient to whom a radiotracer has been administered in a molecular imaging system including a solid-state gamma camera and a variable-angle square hole (VASH) collimator, acquiring two stereotactic molecular images with the VASH collimator, each of the two stereotactic molecular images being acquired when the VASH collimator is adjusted to a different one of the two different slant angles, calculating a 3D position of a hot spot, and performing a molecular image-guided biopsy procedure on the basis of the calculated 3D position. In acquiring the two stereotactic molecular images, the VASH collimator is positioned such that the two different slant angles are in a plane generally parallel (that is, within 30 degrees of parallel) to a coronal plane of the patient.

The invention discloses a Compton imaging system suitable for gamma ray detection in a complex radiation field, and solves the problem that an existing Compton camera cannot reconstruct an image or an imaging result is affected in a complex radiation environment, and the Compton imaging system specifically comprises a front-end detection unit, a front-end electronics control unit and a rear-end data processing and control unit, the front-end detection unit comprises a shielding shell, and a scattering layer array detection module and an absorption layer array detection module which are arranged in the shielding shell in parallel; the front-end electronics control unit comprises a signal processing module, a communication module and a control module; the signal processing module is respectively connected with the scattering layer array detection module and the absorption layer array detection module; the signal processing module is connected with the signal processing module and the rear-end data processing and control unit through the communication module; the control module is connected with the communication module. The imaging system provided by the invention can reduce the interference of gamma camera shooting outside the target view field on the front-end detection unit, and improves the imaging quality.

An improved imaging apparatus and method. The portable SPECT imaging device may be co-registered with an imaging modality, such as ultrasound. A gamma camera panel including a gamma camera sensor may be connected to the robotic arm. A coded aperture mask may be placed in front of the gamma ray photon sensor and used to construct a high resolution three-dimensional map of the radioisotope distribution within the patient, which map may be generated by scanning the patient from a reduced range in a direction around the patient and placing the radiation sensor near the patient. Enhanced imaging sensitivity and resolution are provided. The SPECT imaging device can be used for guiding medical intervention, such as biopsy and ablation treatment, and can also be used for guiding surgery.

The present invention relates to methods of imaging adenomyosis using the radiopharmaceutical agent 99mTc-maraciclatide. The technetium-99m radiopharmaceutical is suitably prepared from a non-radioactive kit containing the RGD peptide maraciclatide. Also described are methods of diagnosis, therapy selection and therapy monitoring of adenomyosis using the agent. The invention also includes the use of the kit and / or gamma camera or gamma detector in the methods of the invention.

The disclosure provides a gamma camera with a collimation unit, which can be applied to the technical field of detection. The gamma camera comprises at least one detection unit, and the detection unit comprises: a collimation unit, the collimation unit comprises a plurality of needle collimator arrays staggered with each other, each needle collimator array comprises a plurality of needle collimators arranged in an array and each having a length direction pointing in the same direction, and the length directions of the needle collimators in different needle collimator arrays point in different directions; a plurality of scintillation crystal units for detecting gamma photons penetrating the collimation unit in different directions and generating a plurality of groups of scintillation light signals; and a plurality of photoelectric conversion units, each of which is coupled to a scintillation crystal unit and used for converting the plurality of groups of scintillation light signals into a plurality of groups of electric signals for imaging of the gamma camera.