22results about How to "Reduced imaging time" patented technology

The invention discloses a terahertz single imaging method and system based on a metasurface structure, and the method comprises the steps: placing the metasurface structure above or in front of an imaging object, the metasurface structure comprises a pixel array composed of a plurality of pixel units, and the pixel units and imaging units of the imaging object are in one-to-one correspondence and have consistent parameters; enabling a terahertz light beam to vertically penetrate through the metasurface structure and the imaging object, and respectively obtaining a metasurface terahertz radio-frequency transmission domain spectrum and an imaging object terahertz radio-frequency transmission domain spectrum; and constructing a resonance intensity detection limit model so as to reconstruct pixel distribution of the imaging object and realize terahertz single imaging of the imaging object. According to the invention, an adaptive correction algorithm and an external complex modulation decoding device are not needed, the image of the measured object is reconstructed by using the resonant frequency, the imaging time is reduced, the sampling speed is improved, and the problems of slow sampling speed, low compatibility and incapability of real-time imaging of a terahertz single imaging technology in the prior art are solved.

The invention discloses a method, device and equipment for determining kinetic parameters based on PET imaging and a medium, and the method comprises the steps: determining a tracer agent output function according to a blood input function and two atrioventricular dynamic models; according to the dynamic PET image set and the tracer output function, performing iterative solution on the two-atrioventricular dynamic model to obtain model dynamic parameters of the two-atrioventricular dynamic model; determining a dynamic parameter image according to the model dynamic parameters; wherein the dynamic PET image set represents a PET image set within a preset duration after the tracer is injected, the preset duration is greater than or equal to 30 minutes and less than 60 minutes, the two atrioventricular dynamic models correspond to a blood atrioventricle and a tissue atrioventricle, and the blood input function represents activity values of the tracer in the blood atrioventricle at different scanning moments; and the tracer output function represents the sum result of the activity value of the tracer in the blood chamber and the activity value of the tracer in the tissue chamber, so that the inspection flux and the use efficiency of the PET imaging equipment are improved.

The invention discloses a microscopic imaging system and a microscope for simultaneously exciting / collecting two-photon and three-photon signals, and belongs to the technical field of optical microscopic imaging. The microimaging system comprises a laser, a microimaging device and a signal acquisition / separation device, and a single erbium-doped fiber laser is used for simultaneously exciting two-photon signals and three-photon signals of unmarked biological tissues. The system respectively excites a third harmonic signal, a two-photon excitation fluorescence signal and a second harmonic signal through 1550nm fundamental frequency light and 775nm double frequency light. The signal acquisition / separation device can acquire the three signals at the same time to realize real-time imaging and detection. The whole microscopic imaging device part is integrated into a handheld small system and is connected with a laser and a signal acquisition / separation device through optical fibers to form a plug-and-play microscopic imaging system, and the plug-and-play microscopic imaging system is suitable for simultaneous observation of two-photon and three-photon signals of unmarked biological tissues.

The invention discloses an XFCT (X-ray fluorescence computed tomography) imaging system based on a Thomson scattering X-ray source, and belongs to the technical field of X-ray imaging, the XFCT imaging system comprises a sample to be detected, an X-ray source module, a sample rotating table, a projection detection module, a sample attenuation detection module and an image reconstruction module; the system structure is adopted, the newly-arranged excitation source and the porous collimator are adopted, the imaging effect is improved, specifically, a Thomson scattering X-ray source is used as the excitation source of XFCT, and the source has the advantages of quasi-monochromaticity, adjustable energy, linear polarization, high brightness, compact structure and the like; the multi-hole collimator is used for collecting signals in parallel, and the sensitivity of the imaging system is remarkably improved while the resolution ratio is kept. The Thomson scattering X-ray source and the porous collimator are combined to be used for XFCT, and the imaging efficiency of the XFCT can be remarkably improved.

The present invention discloses a wavenumber domain three-dimensional ultrasound full-matrix imaging method based on CUDA. The present invention represents the original full-matrix data in the form of a five-dimensional matrix, converts the obtained original full-matrix data into the wavenumber domain through a five-dimensional fast Fourier transform, realizes the wavenumber conversion between the original data coordinate system and the imaging coordinate system by means of Weyl's Identity, obtains the mapping of the image coordinate system through eight linear interpolation, and then obtains the three-dimensional image through a three-dimensional fast inverse Fourier transform. The present invention adopts the VTK module and uses the MIP (maximum intensity projection) ray projection method to obtain the rendered two-dimensional image, and can change the observation angle and distance of the three-dimensional image in real time. The present invention has the real-time high-efficiency, high-quality three-dimensional imaging and two-dimensional rendering capabilities for variable regions of interest, can be flexibly transplanted to computer equipment with a CUDA computing platform, and can cope with the rapid processing of large amounts of three-dimensional full-matrix data.

The invention relates to a photoacoustic microscopic imaging method and system. The method comprises the following steps: arranging a sample at a specified position; the spatial light modulator loads a phase diagram corresponding to the Gaussian light, scanning is carried out at a set rate, and an imaging result is obtained; selecting a region of interest according to the imaging result, and performing axial modulation imaging in the region of interest; in the axial modulation imaging process, the spatial light modulator loads 2N + 1 phase diagrams corresponding to non-sinusoidal modulation functions of different phases in sequence; phases corresponding to the 2N + 1 phase diagrams are as follows: N is the number of modulation frequencies; and reconstruction is carried out based on 2N + 1 one-dimensional photoacoustic signals obtained through axial modulation imaging scanning, and the photoacoustic signals after bandwidth expansion are obtained. According to the invention, the bandwidth of the photoacoustic signal can be expanded to GHz, an axial high-resolution imaging result is obtained, the data volume is reduced, the imaging time is shortened, and the imaging speed is improved.

The application discloses a kind of super-resolution imaging method and device based on quantum correlation photon parallel collection, the present application uses optical beam splitter to divide the fluorescence detected in microscope into two beams again into parallel detection system, two-way parallel detection can realize more efficient collection to fluorescence correlation photon pair after correction alignment, to reach better image quality.Compared with single parallel detection light path, the present application is used in quantum dot and solid defect with single-photon source characteristics;The present application can realize resolution improvement without improving laser power by using simple beam splitting second-order correlation measurement.Compared with existing quantum correlation imaging technology, the two-way parallel collection mode designed in the present application can perform coincidence measurement in space-time, and more coincidence photon information is retained, the imaging time is shortened, which can be applied in different super-resolution light paths, and the application range of quantum correlation photon detection technology is widened.

The invention provides a preparation method of a nanocapillary with an ion rectification effect and application of the nanocapillary, and particularly relates to application of the nanocapillary in improving the resolution ratio, the image quality and the scanning speed of a scanning ion conductance microscope (SICM). Ions are rectified and modified on the nano capillary to improve the resolution of the SICM, and meanwhile, the image quality and the scanning speed are improved well.

The invention relates to the field of large-view scenes, and provides a nonlinear optical large-view imaging system which comprises a light source system, a laser scanning system and a laser detection system. The light source system is used for emitting laser; the laser scanning system comprises a focusing lens and a galvanometer, the galvanometer is located between the focusing lens and the tested sample, the focusing lens is used for focusing laser to the tested sample, and the galvanometer vibrates according to a preset scanning angle to achieve scanning of a laser focus on the tested sample; the laser detection system comprises a compound eye type collection structure and a detector, the compound eye type collection structure comprises a plurality of closely arranged single lenses, and an optical signal generated by a detected sample enters the compound eye type collection structure; the detector is used for detecting the light signals collected by the compound eye type collection structure. The laser scanning imaging range can be expanded, it is guaranteed that laser beams are always spread along the optical axis of the focusing lens, signals excited by the whole scanning view field can be comprehensively collected, and the large-view-field imaging efficiency and the signal intensity are improved.

This invention provides a method and system for planning emergency missions for imaging satellites based on a synthesis strategy, relating to the field of imaging satellite mission planning technology. This invention can identify conflicts in the planning scheme for emergency missions. Under the condition of satisfying synthesis constraints, it synthesizes the selected emergency missions with the conflicting missions in the planning scheme, reducing the number of maneuvers and startups of the imaging satellite during mission imaging, as well as the number of shutdowns at the end of imaging, thereby increasing the chances of completing emergency missions and improving the effectiveness of emergency mission planning. When no synthesis constraints are satisfied, an emergency mission insertion strategy is executed. This allows the selected emergency missions to be inserted into conflict-free positions within the visible time window when there are many conflicts. Synthetic observation reduces the imaging time of the imaging satellite, improves the resource utilization efficiency of the imaging satellite, and reserves more idle imaging time slots for subsequent emergency mission scheduling.

The invention relates to a dental X-ray imaging system, a method, a computer program and a computer readable medium. The invention relates to a dental X-ray imaging system (100) for computed tomography (CT) dental X-ray imaging of an object (300). The system (100) comprises: a dental X-ray imaging unit (102), the dental X-ray imaging unit comprising: an X-ray source portion (114), an X-ray imaging detector portion (116), and a gantry portion (112); and a control system (106). The invention also relates to a method for computed tomography (CT) dental X-ray imaging, a computer program and a tangible non-volatile computer readable medium.

This invention relates to the field of monitoring corrosion morphology and pH dynamic distribution in steel, and particularly to a rapid and intelligent monitoring method and system for in-situ monitoring of pitting morphology and surrounding pH dynamic distribution during electrochemical testing of steel pitting corrosion. First, an in-situ steel test sample with an observation surface is prepared and encapsulated, and then horizontally mounted in an adjustable electrolytic cell. Next, a methyl orange calibration solution with a pH gradient of 1-7 is prepared, and images of the sample at different pH values ​​are captured and imported into the system for calibration, establishing a quantitative mapping relationship between pH and the Lab values ​​of the calibrated images. Finally, in-situ electrochemical testing is conducted in a colorless salt test solution containing the same concentration of methyl orange, simultaneously monitoring the morphology of pitting initiation and development, as well as the dynamic evolution of the surrounding pH. This system can achieve millisecond-level dynamic in-situ monitoring of the spatial distribution of pH around pitting corrosion during the corrosion growth process, and can continuously capture real-time pH evolution information during the initiation and expansion of pitting corrosion.

The application discloses a method and device for determining kinetic parameters based on PET imaging, equipment and medium, the method comprises the following steps: determining the tracer output function according to the blood input function and the two-compartment dynamic model; according to the dynamic PET image set and the tracer output function, the model dynamic parameters of the two-compartment dynamic model are obtained by iterative solution; according to the model dynamic parameters, the kinetic parameter image is determined; wherein, the dynamic PET image set represents the PET image set within a preset time after tracer injection, the preset time is greater than or equal to 30 minutes and less than 60 minutes, the two-compartment dynamic model corresponds to the blood compartment and the tissue compartment, the blood input function represents the activity value of the tracer in the blood compartment at different scanning times, the tracer output function represents the sum of the activity value of the tracer in the blood compartment and the activity value of the tracer in the tissue compartment, which improves the inspection throughput and use efficiency of the PET imaging equipment.

This invention provides a three-dimensional full-focusing ultrasound imaging method based on a frequency-wavenumber domain row-column addressable array, belonging to the field of three-dimensional full-focusing ultrasound. The method includes the following steps: using a row-column addressable array with a total of N+N transmitting elements to perform ultrasonic scanning on a medium to obtain acquired signals; based on the acquired signals, performing spatial sampling to obtain a three-dimensional voxel network; using a frequency-wavenumber domain method to beamform the radio frequency data corresponding to the three-dimensional voxel network; and performing envelope processing on the beamformed data to form a three-dimensional image. This invention's beamforming method for three-dimensional full-focusing ultrasound imaging based on a frequency-wavenumber domain row-column addressable array significantly reduces the number of elements and beamforming channels required for three-dimensional imaging by using a row-column addressable array, while providing a larger imaging area. The imaging process employs full-matrix capture to obtain high-resolution images, and the frequency-wavenumber domain beamforming method significantly shortens the imaging time.

The application discloses a helical line multi-point amplification sampling photoacoustic volume imaging method and system, and belongs to the technical field of photoacoustic volume imaging. In step S1, signal amplification training data set is acquired; the imaging area of a biological tissue or a phantom sample is adjusted to be located in a set sound field range of a three-dimensional bowl-shaped ultrasonic array, three-dimensional photoacoustic volume imaging is performed on the biological tissue or the phantom sample to obtain non-rotation scanning sparse data, a pre-amplification photoacoustic chord diagram and a post-amplification photoacoustic chord diagram; in step S2, an interpolation network is constructed and trained; a U-Net interpolation network is constructed, the pre-amplification photoacoustic chord diagram is taken as input, the post-amplification photoacoustic chord diagram is taken as a real label for training, error analysis training is performed, and an optimal interpolation model with minimum error is saved. The application replaces traditional multi-rotation angle physical rotation scanning by using deep learning virtual amplification sampling technology, significantly shortens imaging time, realizes high-speed three-dimensional imaging under single-pulse excitation, and is suitable for real-time dynamic monitoring scenes.

The invention relates to the technical field of microscope imaging, in particular to a microscopic imaging method and device based on grating illumination, equipment and a medium. According to the application, stripe-shaped illumination light is formed through the grating device with alternately arranged light-transmitting areas and light-proof areas, the imaging camera is automatically triggered to capture the sample image after each movement of the grating device, the background picture and the highlight picture are created, and the gray value difference of corresponding pixel points of any two captured images is calculated, so that the image quality is improved. And when the gray value difference is smaller than or equal to the preset threshold value, the corresponding pixel values in the background picture and the highlight picture are updated, so that the imaging time is greatly shortened, the imaging efficiency is improved, the complex calculation processing is reduced, and the calculation complexity is reduced.

The invention provides an artificial intelligence method for mutual conversion of a whole body PET image and a CT image. The mode conversion between the whole body CT image and the PET image is realized by using an enhanced conditional generative adversarial network (cGAN) model. According to the method, a residual error convolution block and a full convolution Transform block are combined, so that the capability of capturing local features and global context information of a model is improved. According to the method, a customized loss function is designed, and the overall quality of the generated image can be improved in combination with the structural consistency loss. At CT-gt; pET (polyethylene terephthalate) and PET-gt; a large number of experiments are carried out on two modal conversion tasks of CT, and results show that the model can generate high-quality images, and the images are close to original images in the aspects of clinical correlation and diagnostic value. The transformer-combined cGAN framework provided by the invention can reduce the requirement of multi-modal image examination, so that the radiation exposure dose and the overall medical cost of a patient are reduced, and a solid foundation is laid for clinical application of PET-CT multi-modal image conversion.

This invention discloses a multi-channel light-slice microscopic imaging device. The image acquisition module includes multiple image detectors. A laser array emits multiple excitation beams of different wavelengths, which are then combined into a single incident beam by an optical path module. This incident beam passes through a scanning galvanometer and an imaging module before illuminating the sample on a stage mounted on a three-dimensional displacement platform. The imaging objective in the imaging module collects fluorescence signals from the sample, which are then split by the beam-splitting module to form multiple fluorescence signals of different wavelengths and projected onto the multiple image detectors. Each image detector forms an image imaging channel. Multiple image imaging channels receive multiple fluorescence signals of different wavelengths and transmit them to the corresponding image detectors. The three-dimensional displacement platform enables three-dimensional displacement movement of the sample slice. By employing a strategy of continuous motion imaging of the sample slice and simultaneous detection and acquisition of fluorescence signals by multiple image detectors, the time interval between sample preparation and imaging, as well as the pauses during imaging, can be reduced.

The invention relates to a multifunctional satellite-borne wide-area imaging search radar detection method, comprising the following steps: 1) search and detection task planning: carrying out task planning for an area to be searched and detected according to relevant parameters of a satellite-borne radar system, and calculating a wide-area rapid search working mode; 2) carrying out a wide-area rapid search working mode for an area along a track, and obtaining an imaging result of the area through on-orbit real-time imaging processing, thereby detecting, screening and locating a target of interest; 3) calculating and selecting a reasonable high-resolution beamforming working mode for parameters of the target of interest output by the wide-area rapid search mode, including range, azimuth resolution, and range azimuth width; 4) carrying out a target recognition and confirmation task workflow, and imaging the targets of interest in the area one by one with high resolution; 5) outputting a target recognition and confirmation result; and 6) looping through steps 1)-5) to carry out observation of the next area along the track.

The invention discloses a terahertz fast tomography system and method.The system comprises a scanning rack and a scanning device, the scanning device comprises a terahertz emission source, a first beam conversion assembly, a second beam conversion assembly and a terahertz detection array which are sequentially arranged, and the scanning rack comprises an inner ring and an outer ring which are rotationally matched with each other; a to-be-detected station is arranged in the middle of the inner ring, the to-be-detected station is located between the first beam conversion assembly and the second beam conversion assembly, and the terahertz emission source, the first beam conversion assembly, the to-be-detected station, the second beam conversion assembly and the terahertz detection array are sequentially arranged on the inner ring in the diameter direction. And a flexible mechanical arm for grabbing a sample to be detected is arranged on one side of the scanning rack. According to the terahertz fast tomography system and method, the imaging time is short, and the system and method are not limited by the appearance structure of a sample.

The application discloses a spectral super-resolution method based on a variational autoencoder, and comprises the following steps: inputting a target RGB image into a first convolutional layer of a spectral super-resolution network to obtain a plurality of feature maps containing shallow layer features corresponding to the target RGB image; inputting the feature maps into an attention mechanism module of the spectral super-resolution network to perform feature mapping on the feature maps; inputting the feature maps subjected to the feature mapping into a second convolutional layer of the spectral super-resolution network to reconstruct a target hyperspectral image corresponding to the target RGB image; and training the spectral super-resolution network according to a first hyperspectral image and a first RGB image extracted by the variational autoencoder, wherein the first hyperspectral image is reconstructed by the untrained spectral super-resolution network on the basis of a training RGB image. The target RGB image is acquired by a common camera, so that the image acquisition difficulty is low, and the hyperspectral image is reconstructed by the spectral super-resolution network, so that the imaging time is short, and the method can be widely applied to the field of spectral super-resolution.