160 results about "Scan time" patented technology

The invention discloses a contour detection method and system for aluminum bar quality inspection based on an image recognition technology, and belongs to the technical field of computer vision detection.According to the method, a high-speed optical scanner is used for scanning the surface of an aluminum bar at multiple incident angles, and reflection change curves at different incident angles are obtained; a two-dimensional grey-scale map is obtained, the two-dimensional grey-scale map is converted into a depth parameter matrix, meanwhile, the incident angle position of a light beam, the scanning speed and a scanning time sequence are synchronously recorded in the scanning process, gradient second-order differential transformation is conducted on the obtained depth parameter matrix in the contour direction, and a curvature amplitude spectrum is generated; a high-speed optical scanner is used for scanning the surface of the aluminum bar at multiple incident angles, a reflection change curve and a depth parameter matrix are synchronously obtained, key parameters such as the light beam incident angle and the scanning speed are recorded, the problem that traditional single-angle scanning contour information is incomplete is solved, the three-dimensional shape of the surface of the aluminum bar can be represented more comprehensively, and the accuracy is high. And initial feature extraction deviation caused by information loss is reduced.

The invention belongs to the technical field of radio metering detection, and particularly discloses a time difference and angle measurement method and device for a microwave navigation landing system and a medium, and the method comprises the steps: responding to a received barker code, obtaining reference time, and carrying out the time synchronization; obtaining a scanning pulse according to the scanning interval and the back-scanning interval; analyzing and extracting the A / D sampling signal according to the scanning pulse to obtain a forward scanning beam and a backward scanning beam in the scanning pulse; obtaining a scanning time difference according to the forward scanning beam and the backward scanning beam; according to the scanned time difference, analysis is carried out based on non-constant clock counting, and a time difference signal is obtained; obtaining MLS angle data based on preset space angle position coding data according to the time difference signal; the invention aims to solve the problems of weak anti-interference acting force and low angle guiding precision of a microwave navigation landing system in the prior art.

The invention discloses a quantitative magnetic susceptibility imaging accelerated scanning method based on short gradient echoes, and belongs to the field of medical image scanning, and the method comprises the steps: designing scanning parameters suitable for short echo data; constructing a de-noising diffusion probability model comprising a forward noise adding process and a reverse de-noising process, wherein a wavelet transform module is embedded in the reverse de-noising process; extracting short echo data from full echo data of the multi-gradient echo sequence, and training the de-noising diffusion probability model based on the short echo data to obtain a trained de-noising diffusion probability model; configuring the scanning parameters in a magnetic resonance imaging system; acquiring short echo quantitative magnetic susceptibility imaging data based on the configured scanning parameters; and inputting the acquired short echo quantitative magnetic susceptibility imaging data into the trained denoising diffusion probability model, and reconstructing a quantitative magnetic susceptibility image. According to the method, through scanning parameter setting and deep learning model optimization reconstruction, the existing quantitative magnetic susceptibility reconstruction scanning time can be greatly reduced, and the image quality is kept consistent.

The invention provides a dynamic PET image and kinetic parameter prediction method and device and a storage medium. The method comprises the steps that first N frames of dynamic PET image data are obtained and preprocessed to obtain a standard image sequence; and inputting the standard image sequence into the prediction model to obtain subsequent frame dynamic PET image data and a corresponding kinetic parameter map. The prediction model comprises an image structure sensing channel for extracting image structure features, a dynamic modeling channel for extracting dynamic parameter features, a cross fusion module for fusing the image structure features and the dynamic parameter features, and a prediction reconstruction module for performing prediction reconstruction based on a fusion result. The method has the advantages that image structure features and kinetic parameter features can be fused on the basis of the dynamic PET image early-stage frames, scanning time and radiation dose are reduced, and meanwhile follow-up frame dynamic PET image data with high image quality and dynamic interpretability and the corresponding kinetic parameter atlas are generated.

The embodiment of the invention provides a magnetic resonance imaging method and related equipment. The magnetic resonance imaging method comprises the following steps: applying a multi-spin echo sequence in each magnetization reset period, and collecting a group of multi-spin echo data sets until M groups of multi-spin echo data sets are obtained; after each magnetization reset period, a T1rho preparation pulse with spin locking duration is applied, then a multi-gradient echo sequence is applied, a group of multi-gradient echo data sets are collected until M groups of multi-gradient echo data sets are obtained, and the M groups of multi-spin echo data sets and the M groups of multi-gradient echo data sets correspond to M different spin locking durations respectively; and performing fitting operation on the M groups of multi-spin echo data sets and the M groups of multi-gradient echo data sets to generate a quantitative atlas. According to the technical scheme, the problems that a traditional T1rho sequence is long in scanning time, low in signal-to-noise ratio and single in contrast ratio are effectively solved, and the technical effects of time multiplexing and multi-contrast imaging are achieved.

The invention discloses a multi-mode whole-body blood vessel magnetic resonance imaging method and device, and the method comprises the steps: displaying prompt information for carrying out the cascade wrapping of a whole-body magnetic resonance coil and the input of a contrast agent for a target object, and enabling the contrast agent to be polysaccharide superparamagnetic iron oxide; setting a signal mark point on the constructed whole body positioning image and configuring a multi-modal imaging sequence; emitting a magnetic resonance radio frequency pulse, and receiving a coil electric signal transmitted by the whole body magnetic resonance coil; determining the signal intensity of each set signal mark point according to the coil electric signal; when the signal intensity is larger than a preset threshold value, whole-body blood vessel scanning is conducted on the target object through the multi-mode imaging sequence; and performing image reconstruction according to the scanned target image sequence to generate a whole body blood vessel image. By adopting the embodiment of the invention, one-stop imaging of large and small blood vessels of the whole body can be realized at one time by utilizing a scanning mode of cascading wrapping of the whole body magnetic resonance coil, so that the scanning time is greatly shortened, and the blood vessel imaging efficiency is improved.

This invention provides a system and method for scanning the properties of micro-regions in solar cells. The system includes: a one-dimensional laser source configured to generate a one-dimensional line-scan laser; a sample stage for holding the solar cell sample to be tested; a precision displacement device configured to cause relative movement between the one-dimensional laser source and the sample stage, enabling the one-dimensional line-scan laser to scan the measured region of the solar cell sample, comprising multiple micro-regions, in a cross-scan manner; a micro-region property measurement unit configured to acquire property data of the scanned measured region; and an automatic control and data processing unit configured to collect the property data from the micro-region property measurement unit, extract property information at the perpendicular intersections of the cross-scans based on the property data, and determine the distribution of micro-region properties based on the property information at the perpendicular intersections. This reduces the number of steps required for micro-region scanning, shortens the scanning time, and reduces the number of sampling operations.

This invention relates to the field of microscopy application technology, and in particular to a SICM scanning control method and related device based on feedback quantization. The method acquires the test height, initial scanning speed, initial safe height of the test point, first speed adjustment start point, and second speed adjustment start point of the test point. It controls the scanning probe to descend from the initial safe height of the test point to the first speed adjustment start point at the initial scanning speed, intervenes with first dynamic speed adjustment, continues to descend to the second speed adjustment start point, intervenes with second dynamic speed adjustment, and continues descending until the probe detects a sudden change in ion current and stops descending. This control method solves the problems of low scanning time resolution and poor safety in existing scanning ion conductivity microscopes by setting an initial speed adjustment point that dynamically adjusts the speed according to the probe's descent position.

The application relates to a magnetic resonance imaging method, device, computer equipment, storage medium and computer program product. The method comprises the following steps: in a first cardiac cycle, a characteristic electrocardio signal of a detection object is identified, a first sequence pulse is applied to the detection object after a preset delay time of identifying the characteristic electrocardio signal, and the first sequence pulse is used for reversing a longitudinal magnetization vector of the detection object; after the first sequence pulse is applied, a second sequence pulse of a target phase mode is applied to the detection object after a recovery time, and an initial cardiac imaging set is acquired, wherein the target phase mode is one of at least two different phase modes, and different target phase modes correspond to different positions of artifacts in the initial cardiac imaging sets; and the initial cardiac imaging sets obtained in each first cardiac cycle are subjected to first registration processing to obtain a cardiac imaging. The method can effectively weaken the artifacts in cardiac delayed enhancement imaging, and does not increase additional operations and additional scanning time.

The application discloses a signal scanning method and device, electronic equipment and storage medium. The frequency point information of all to-be-scanned frequency points is acquired; the frequency point scanning frequency of the to-be-scanned frequency points and the to-be-scanned frequency point cycle sequence are determined according to the frequency point information; the to-be-scanned frequency point cycle sequence is grouped according to the frequency point scanning frequency, at least one to-be-scanned frequency point grouping sequence is obtained, when there are multiple to-be-scanned frequency point grouping sequences, the frequency points contained in all to-be-scanned frequency point grouping sequences are not completely the same; all to-be-scanned frequency point grouping sequences are scanned in turn, and the scanning is stopped when a target signal is scanned, the problems that the scanning time is long, important services are easily missed, and voice is late to access in the prior signal scanning mode based on random arrangement scanning are solved, the signal scanning time is reduced, the signal scanning efficiency is improved, the probability of service loss and voice late access is reduced, and the user experience is improved.

An exemplary AI system and method are disclosed for reconstructing high-fidelity motion-corrected MRI scans from low-field, motion-corrupted MRI scans (e.g., neonatal MRI data) using a neural network (NN) model in combination with a physics-based motion model. The exemplary AI system and method can enhance image quality and remove motion artifacts which can allow for scans to be performed with significantly reduced scan time, a particular benefit for neonatal subjects as well as all patients when employing low-field MRI.

The application relates to an image generation method, device and equipment and a storage medium. The application comprises the following steps: obtaining a tissue-to-blood concentration ratio corresponding to each scanning time within a first scanning time length; and generating a target tissue uptake rate image of a scanning object according to the tissue-to-blood concentration ratio and a preset mapping relationship. Since the mapping relationship represents the relationship among the scanning time, a blood activity value corresponding to the scanning time and an accumulated blood activity value corresponding to the scanning time, the accumulated blood activity value within a scanning time period corresponding to the scanning time is obtained based on the mapping relationship, so that the target tissue uptake rate image is obtained based on the accumulated blood activity value, the blood activity value and the tissue-to-blood concentration ratio, and long-time continuous scanning of the scanning object is not required.

The invention provides a device and a method for acquiring a simulated load MR scanning ankle three-dimensional fusion model. The device comprises a nuclear magnetic resonance spectrometer, a wearable device, a fixing device and image processing equipment, the wearable device is fixed on the upper body of a to-be-tested user, and the ankle fixing device is fixed on the ankle of the to-be-tested user and is connected with the simulated load through the connecting rope and the wearable device; the nuclear magnetic resonance spectrometer is arranged above the ankle of the user to be detected, the axial line of the inspection positioning lamp is aligned with the axial midpoint of the ankle fixing device, and a magnetic resonance image is obtained through scanning of the nuclear magnetic resonance spectrometer; and the image processing equipment is in communication connection with the nuclear magnetic resonance spectrometer, acquires a magnetic resonance image and generates an ankle three-dimensional fusion model. According to the invention, through the small-angle pulse, the FFE sequence and the undersampling technology, the scanning time is shortened and the submillimeter reconstruction precision is ensured at the same time. Through combination of a water-fat separation technology and multi-algorithm optimization, automatic and accurate segmentation of bones and skin is realized, and the three-dimensional model meets the requirements of clinical diagnosis and finite element analysis.

To suppress the occurrence of smear in recording.SOLUTION: A time required for print scanning is estimated from the width of image data and information on a printing method, and a delay time is set based on the estimated print scanning time.SELECTED DRAWING: Figure 7

This invention discloses a text layout image recognition system for published and printed textbooks, relating to the fields of artificial intelligence and computer vision. It includes a data acquisition synchronization module, an illumination feature analysis module, a brightness anomaly detection module, a paragraph reconstruction and repair module, and a light source dynamic compensation module. The data acquisition synchronization module acquires light source current waveforms, scanning light intensity changes, page line spacing markers, and imaging clock information during the text layout image recognition process, generating a draft containing a complete scanning time sequence. This invention achieves precise correspondence between light source brightness and scanning time sequence through synchronous acquisition of illumination and current, and illumination feature analysis, eliminating the influence of illumination fluctuations and improving the stability of layout recognition. Combining paragraph reconstruction and repair with dynamic light source compensation, a closed-loop control system from illumination detection to page reconstruction is constructed. Illumination balance is optimized through reverse illumination compensation and shading control, ensuring accurate line spacing, continuous layout, and consistent content logic.

Embodiments herein relate to passive intermodulation (PIM) delay estimation for multiple sources. In some embodiments, there is proposed a method (1200) for estimating a time delay of a PIM source for a radio device having multiple PIM sources. In an embodiment, the method may comprise the step of determining (S1201) a time delay window with respect to one or more possible PIM sources of the radio device. The method may further comprise the step of determining (S1202) a plurality of time delay values in a time delay window. The method may comprise the steps of: for each of one or more primary functions, scanning (S1205) each of a plurality of time delay values in a time delay window by performing an adaptive algorithm based on the primary functions to obtain an adaptive set of parameters, and estimating (S1208) one or more time delays for each PIM source from the set of adaptive parameters. Through the embodiments herein, an adaptive scan delay estimation method is proposed in place of a correlation estimation method, which can improve delay estimation accuracy for multiple PIM sources.

This invention discloses a method and system for adjusting and optimizing CT contrast-enhanced scanning parameters, comprising: acquiring the patient's physiological characteristic parameters and injection parameters, and calculating the contrast agent concentration at the target site at different times based on the physiological characteristic parameters and injection parameters, generating a time-density curve. The enhancement coefficient corresponding to the current peak voltage of the X-ray tube is determined using the CT contrast-enhanced curve, and the time-enhanced value curve of the current target site is determined by combining the time-density curve. The peak enhancement value is determined based on the scanning time window and the time-enhanced value curve, and the peak enhancement value is compared with the enhancement target. If the peak enhancement value does not meet the enhancement target, the injection parameters or scanning parameters are adjusted, and the peak enhancement value is recalculated and compared with the enhancement target. This process continues until the peak enhancement value meets the enhancement target. This method can automatically search and decide on the optimal CT contrast-enhanced scanning scheme in reverse, solving the problem of unsatisfactory CT scan results.

The invention discloses a two-bit gate working frequency screening method and system, a medium and a quantum circuit, and the method comprises the steps: carrying out the energy spectrum scanning of two quantum bits in a two-bit gate, and obtaining an energy spectrum scanning result and relaxation time; processing according to the relaxation time to obtain first dephasing time of the quantum bit under a preset error threshold; performing quantum state chromatography on the quantum bits to obtain corresponding residual coupling, obtaining a relationship between the residual coupling and bit frequency based on an energy spectrum scanning result, and determining a first frequency range; adjusting the bit frequency to a first frequency range, and respectively measuring second dephasing time of the two quantum bits under different signal frequencies through quantum phase chromatography; determining a corresponding second frequency range based on the first dephasing time and the second dephasing time, and obtaining a bit frequency corresponding to the minimum residual coupling as a working frequency; repeated calibration is not needed, experiment resources and scanning time are saved, and experiment efficiency is improved.

The invention is suitable for the technical field of magnetic resonance chemical exchange saturation transfer imaging, and provides a magnetic resonance chemical exchange saturation transfer imaging method, device, equipment, product and storage medium. A gradient echo sequence is adopted to collect saturated water molecule signals, and the collected water molecule signals are stored in a K space; and wave control coding is introduced in the acquisition process, and a CEST image is reconstructed based on a water molecule signal of a K space. The introduction of wave control coding can reduce the scanning time. Due to the fact that the wave control coding sampling efficiency is high, a larger matrix size can be supported within the same time, high-resolution imaging is achieved, the partial volume effect can be relieved, and CEST quantitative accuracy is improved.

The invention relates to a magnetic resonance scanning method, system and device and a storage medium. The method comprises the following steps: determining sequence scanning time corresponding to each mark delay scanning process according to corresponding mark duration time and mark delay time in a multi-mark delay scanning process required by a perfusion area to be scanned; obtaining a target pulse sequence based on the sequence scanning time; and scanning the perfusion area to be scanned according to the target pulse sequence until the multi-mark delay scanning process is completed. By adopting the method, the scanning efficiency can be improved.

The application relates to a multi-nucleus imaging sequence determination method, device and magnetic resonance system, wherein the multi-nucleus imaging sequence determination method comprises the following steps: acquiring an initial multi-nucleus imaging sequence, wherein the initial multi-nucleus imaging sequence comprises the pulse arrangement of several kinds of nuclei in a single repetition time; and adjusting the pulse arrangement of at least one kind of nucleus to optimize the initial multi-nucleus imaging sequence, thereby obtaining a target multi-nucleus imaging sequence. According to the application, the target multi-nucleus imaging sequence can be obtained, and the target multi-nucleus imaging sequence is a multi-nucleus imaging sequence obtained by combining and optimizing a plurality of single-nucleus imaging sequences. Therefore, the multi-nucleus imaging sequence can complete the scanning and imaging of multiple kinds of nuclei in one scanning and imaging process, and compared with sequentially imaging each kind of nucleus respectively, the scanning time of the sequence is shortened, and the imaging efficiency is improved. The application solves the problem that there is no imaging sequence determination method for multi-nuclear magnetic resonance imaging technology in the related art.

The present invention relates to a method, system, device and storage medium for picking up refracted wave velocity, which obtains a single-shot record of seismic exploration, sets the time and velocity scanning intervals and scanning intervals based on the recording track time at the shot point. A time-channel two-dimensional window is introduced to perform a time and velocity nested loop; a time-channel two-dimensional window correlation analysis technology is proposed to perform a time-channel two-dimensional window correlation analysis on each group of scanning time and scanning speed to obtain the corresponding optimized superposition amplitude. Then, the velocity spectrum is calculated and plotted, and the maximum value of the velocity spectrum is read in combination with the single-shot record of the seismic wave. The scanning speed corresponding to the maximum value is the refracted wave velocity of the corresponding refracted wave. The method uses the optimized superposition amplitude calculated by the window correlation analysis technology to determine the refracted wave velocity, and has the characteristics of high analysis accuracy and strong anti-interference ability. Not only can the initial refracted wave velocity be picked up, but also the subsequent refracted wave velocity can be extracted, which strongly supports the application of the refracted wave method in seismic exploration.

The invention discloses a wavelength tuning phase-shifting interference method assisted by element absorption spectral lines and a resonant cavity. The wavelength tuning phase-shifting interference method comprises the following steps: establishing a system comprising a Fizeau interferometer, an external cavity tunable laser, an element absorption cell and the resonant cavity; phase-shifting interference measurement is carried out by using a sweep-frequency light source in cooperation with a Fizeau interferometer, and the change of an interference image is recorded by a high-speed CMOS camera; recording the spectral line of the light source scanning through the rubidium absorption spectral line and the resonant cavity; and calibrating the relationship between the scanning time and the scanning frequency according to the measurement spectral line, determining the phase change quantity according to the wavelength, selecting an interferogram corresponding to the phase change quantity according to the requirement of a phase shift algorithm, and calculating to realize high-precision detection of the surface type. According to the method, the phase shift is determined through high-precision wavelength determination, and the detection precision is improved. Meanwhile, due to high-precision wavelength resolution, the method can be applied to wavelength tuning phase-shifting interference with an ultra-long detection distance.

The invention discloses a CT (Computed Tomography) image reconstruction method, which comprises the following specific steps of: 1, acquiring original data according to CT scanning, and setting scanning layer thickness, scanning time, tube current and tube voltage parameters before scanning; second, algorithm correction is conducted on the original data to obtain corrected data, a comprehensive correction algorithm based on a statistical model and priori knowledge is adopted for algorithm correction, and the algorithm correction comprises noise statistical modeling, artifact recognition and correction and data smoothing; and 3, angular rearrangement is performed on the correction data to obtain angular rearrangement data, wherein the angular rearrangement data comprises the position of an angular rearrangement center channel and the positions of two channels adjacent to the angular rearrangement center channel. According to the method, a series of accurate processing and algorithm optimization are carried out on the original data, so that the quality and the resolution of the CT reconstructed image are improved, the generation of artifacts is reduced, and more accurate and clearer image information is provided for medical diagnosis.

The embodiment of the invention discloses a code change problem scanning method and device, equipment and a storage medium. The method comprises the steps that in response to triggering of a target code change event, code change information corresponding to the target code change event is recorded; in response to triggering of a code saving event, performing problem scanning on the local code before and after change according to the code change information to obtain problem comparison information before and after change; and obtaining a pre-generated full-amount code scanning problem list, and updating the full-amount code scanning problem list according to the problem comparison information before and after the change so as to complete problem scanning of the change code. Based on this, by recording the code change information, problem scanning is only carried out on the changed local code, and the full-amount code scanning problem list is updated based on the problem comparison information before and after the change, so that the scanning time of the changed code is greatly shortened.

The invention discloses a radar resource scheduling method based on stacked beams, and the method comprises the steps: determining radar parameters, and an azimuth angle range and a pitch angle range which need to be scanned according to a plurality of target tasks; further determining the number of azimuth wave positions and the number of pitching wave positions; determining a plurality of pitching wave position piles corresponding to each azimuth dimension according to the number of the pitching wave positions and a preset number; based on the attribute information and the mapping relationship of each target task, aggregating a plurality of target tasks corresponding to the same azimuth dimension according to a pitching wave position pile to obtain a plurality of aggregated task packets corresponding to each azimuth dimension; and scheduling a target aggregation task packet from the plurality of aggregation task packets corresponding to each azimuth dimension, and carrying out parallel processing on a plurality of target tasks in the target aggregation task packet. According to the method, the searching and scanning time can be greatly shortened, and rapid discovery and response to high-speed and high-maneuvering targets and sudden threats are realized; the multi-task robustness of a radar system can be improved in a high-density target environment.

This invention discloses a dual-axis error calibration method for phased array weather radar based on the apparent motion trajectory of the sun, comprising the following steps: Step 1, calculation of the sun pointing angle; Step 2, selection of azimuth scanning parameters based on calibration error and azimuth deviation estimation; Step 3, evaluation of elevation angle calibration accuracy based on azimuth scanning time and apparent solar motion; Step 4, sampling of solar radiation signals; Step 5, extraction of peak values ​​in pulse-by-pulse repetition cycles and acquisition of dual-axis calibration coefficients. The method disclosed in this invention can generate dual-axis error calibration coefficients for X-band phased array weather radar that simultaneously meet high timeliness and high accuracy requirements. This is of great significance for effectively improving the detection capabilities of X-band phased array weather radar in mobile and unattended field applications.

The present disclosure addresses the challenges of in vivo phosphorus imaging by providing a clinically useful phosphorus MRI (PMRI) system and method that may be performed on a standard MRI system in a clinically reasonable scan time using specifically tuned coils, a phosphorus pulse sequence, and improved reconstruction and post processing algorithms.

A positioning scan method and apparatus for dual-source CT systems addresses the low working efficiency of existing positioning scan methods. The system may include first and second X-ray tubes that automatically return to predetermined initial positions before positioning scans: the first tube positioned directly above or below the gantry, and the second tube positioned at a lateral location on the gantry. The positioning scan method receives positioning scan instructions and executes operations based on instruction type. For front image scan instructions, the first tube may perform exposure and obtain front projection data. For lateral image scan instructions, the second tube may perform exposure and obtain lateral projection data. For dual-positioning image scan instructions, both tubes may perform exposure, obtaining both front and lateral projection data concurrently. This improves operational efficiency by eliminating tube repositioning delays and enabling simultaneous dual-plane imaging, thereby reducing overall scan time and enhancing workflow.

The invention discloses a multi-parameter magnetic resonance quantitative imaging method and system, and relates to the technical field of MRI (magnetic resonance imaging), and the method comprises the steps: employing a multi-overlap echo sequence XMOLED, carrying out the simulation of magnetic resonance simulation software, and generating a simulation XMOLED image, constructing a simulation data set composed of a large number of paired simulation XMOLED images, simulation T2, T2 * and an apparent diffusion coefficient (ADC) quantitative graph, and training a deep learning neural network used for reconstruction of the magnetic resonance parameter quantitative graph; sequence parameters are configured on a magnetic resonance imaging instrument, an XMOLED signal of an actual imaging object is collected, and an XMOLED image of the actual imaging object is obtained through signal processing; and inputting the XMOLED image of the actual imaging object into the trained magnetic resonance parameter quantitative graph reconstruction network for reconstruction to obtain T2, T2 * and ADC quantitative graphs of the actual imaging object. According to the method, T2, T2 * and ADC quantitative diagrams can be obtained at the same time only through single-sequence XMOLED collection, the problem that scanning time is prolonged due to multi-sequence combined imaging is solved, and rapid and accurate multi-parameter quantitative magnetic resonance imaging is achieved.