19 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.

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.

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.

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.

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 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.

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.

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 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.

Method for estimating count loss in a gamma camera, wherein the method comprises the following: Injecting a synthetic pulse at a given rate into a data stream originating from a photodetector, wherein both analog and digital synthetic pulses are injected simultaneously or sequentially into the data stream, wherein analog synthetic pulses are injected prior to digitization of the data stream, and wherein digital synthetic pulses are injected after digitization of the data stream; Integrating the synthetic pulse into the data stream to form an integrated data stream; Determining a number of synthetic pulses in the integrated data stream that are passed on to a final image; and Determining the counting loss from equation (2) P r o z e n t u a l e r Z a ¨ h l v e r l u s t = ( Z a h l e i n g e f u ¨ h r t e r I m p u l s e − Z a h l e r k a n n t e r _ I m p u l s e ) × 100 _ Z a h l e i n g e f u ¨ h r t e r I m p u l s e

Improved imaging devices and methods. A portable SPECT imaging device may co-register with imaging modalities such as ultrasound. Gamma camera panels including gamma camera sensors may be connected to a mechanical arm. A coded aperture mask may be placed in front of a gamma-ray photon sensor and used to construct a high-resolution three-dimensional map of radioisotope distributions inside a patient, which can be generated by scanning the patient from a reduced range of directions around the patient and with radiation sensors placed in close proximity to this patient. Increased imaging sensitivity and resolution is provided. The SPECT imaging device can be used to guide medical interventions, such as biopsies and ablation therapies, and can also be used to guide surgeries.