43results about How to "Improving Imaging Results" patented technology

Disclosed herein is a computer-implemented method for improving a lithographic process for imaging a portion of a design layout onto a substrate using a lithographic projection apparatus, the method comprising defining a multi-variable cost function, the multi-variable cost function being a function of a stochastic effect of the lithographic process.

The present invention relates to a method and also an imaging system to compensate for patient motion when recording a series of images in medical imaging, in which a number of images of an area under examination of a patient (17) are recorded at intervals with an imaging system (1) and are related to one another. With the method a localization system (2) is used as the series of images are being recorded to permanently or at a time close to the recording of the individual images, record a momentary spatial location of the area under examination in a reference system permanently linked to the imaging system (1), a first spatial location of the area under examination recorded close to the time of recording of a first image is stored, and a deviation of the images recorded momentarily in each case of the first spatial location is determined and by changing the geometrical circumstances of the imaging system (1) at a time to close the recording of the spatial location and / or through geometrical adaptation of an image content of an image just recorded, is at least approximately commentated for, so that the images show the area under examination in the same position and orientation. The method does not require any time-consuming interaction with the operator and is also suitable for compensating for larger movements of the patient.

The present invention relates to a method to compensate for patient motion in series recordings in medical imaging, in which a plurality of images of an examination area of a patient (17) are recorded at time intervals with an imaging system (1) and related to each other. The invention also relates to an imaging system (1) for implementing the method. With the method, before the start of the series recordings a 3D image data set is recorded by a 3D recording of the examination area, which establishes a reference system. A first spatial position of the examination area in the reference system is then either obtained by recording a first image of the series recordings and registering it with the 3D image data set or by calculating it from a known calibration of the imaging system (1). Each further image of the series recordings is registered immediately after recording with the 3D image data set, to obtain the current spatial position of the examination area in the reference system. Finally a difference in respect of the first spatial position is determined and at least some of the difference is compensated for at least approximately by changing geometric relationships of the imaging system (1) in temporal proximity to registration. The method allows patient motion to be compensated for without interaction by the user of the imaging system.

The invention relates to a high-speed calculation correlated imaging system and method based on a preset modulatable light source.The imaging system comprises the light source, an electro-optical modulator array modulating system, a single-point light intensity detector, a data collecting module and a data synchronizing and processing module; the electro-optical modulator array modulating system is used for performing random binary intensity modulation on light emitted by the light source to form a light field with intensity distributed in a random fluctuation mode in free space; the single-point light intensity detector is used for detecting total light intensity obtained after the light field is reflected or transmitted by a target object to be detected and converting the total light intensity into electric signals related to the total light intensity; the data collecting module is used for obtaining the electric signals and obtaining total light intensity fluctuation information, the data synchronizing and processing module is used for controlling data synchronization between the electro-optical modulator array modulating system and the data collecting module and then conducting correlation calculation to obtain an image of the target object to be detected.The electro-optical modulator array modulating system is used for modulating light, the modulation speed is high, the refreshing frequency effect of the preset light source is improved, the refreshing frequency is at least improved to megahertz order, and imaging result and imaging quality are improved.

Disclosed herein is a computer-implemented method for improving a lithographic process for imaging a portion of a design layout onto a substrate using a lithographic projection apparatus, the method comprising defining a multi-variable cost function, the multi-variable cost function being a function of a stochastic effect of the lithographic process.

The invention relates to generating panoramic images of foreground and background panorama. Within mosaiced panoramic images there will often be more than one pixel value available for each pixel position. In the invention pixel values for a foreground panoramic image are selected by taking the most extraordinary pixel as foreground, and pixel values for a background image are selected by taking a median pixel value. We have found that such pixel selection gives improved results with respect to the prior art.

The invention discloses an ultrasonic array imaging method. The method comprises the following steps: performing wave beam forming processing according to signals collected by all array elements in an ultrasonic array, increasing the signal noise ratio of ultrasonic scanning line signals through space array gain, performing wavelet threshold denossing processing according to scanning line signals subjected to beam forming processing, performing envelope demodulation according to the ultrasonic scanning line signals subjected to wavelet threshold denossing processing, so as to envelopes of scanning signals, and performing image transformation processing on an image formed by scanning line envelope signals, so as to obtain a corrected scanned image. According to the invention, the wavelet deformation and ultrasonic array are combined, a wavelet threshold denossing method is adopted to further increase the signal noise ratio while the array space gain is obtained, the ultrasonic array imaging effect is greatly improved, and the testing performance of ultrasonic array to far field defects is improved.

The invention discloses an X-ray CT-fluorescence imaging apparatus and method of single-source-emission and dual-mode imaging. The method, by emitting X ray from a single source and exciting a fluorescent material, can achieve simultaneous dual-mode imaging through the X ray and a fluorescent detector. The apparatus comprises an X-ray light source, a carrying platform, an X-ray detector and the fluorescent detector which are arranged on the same plane, wherein the X-ray light source, the carrying platform and the X-ray detector are arranged on the same line, so that an X-CT light path is constituted; a fluorescent lens which is arranged in the fluorescent detector is arranged in a mode of aligning with the carrying platform; and the relative positions of the X-ray light source, the X-ray detector and the fluorescent detector are fixed, and the X-ray light source, the X-ray detector and the fluorescent detector can rotate relative to the carrying platform by taking the carrying platform as a center.

The present invention relates to a method and also an imaging system to compensate for patient motion when recording a series of images in medical imaging, in which a number of images of an area under examination of a patient (17) are recorded at intervals with an imaging system (1) and are related to one another. With the method a localization system (2) is used as the series of images are being recorded to permanently or at a time close to the recording of the individual images, record a momentary spatial location of the area under examination in a reference system permanently linked to the imaging system (1), a first spatial location of the area under examination recorded close to the time of recording of a first image is stored, and a deviation of the images recorded momentarily in each case of the first spatial location is determined and by changing the geometrical circumstances of the imaging system (1) at a time to close the recording of the spatial location and / or through geometrical adaptation of an image content of an image just recorded, is at least approximately commentated for, so that the images show the area under examination in the same position and orientation. The method does not require any time-consuming interaction with the operator and is also suitable for compensating for larger movements of the patient.

A method for improving a lithographic process for imaging a portion of a design layout onto a substrate using a lithographic projection apparatus, the method including: calculating a discrete pupil profile based on a desired pupil profile; selecting a discrete change to the discrete pupil profile; and applying the selected discrete change to the discrete pupil profile. The methods according to various embodiments disclosed herein may reduce the computational cost of discrete optimization from O(an) to O(n) wherein a is constant and n is the number of knobs that can generate discrete change in the pupil profile.

Disclosed herein is a method, and system (1) for implementing same, to compensate for patient motion in series recordings in medical imaging, in which a plurality of images of an examination area of a patient (17) are recorded at time intervals with an imaging system (1) and related to each other. Before the start of the series recordings a 3D image data set is recorded by a 3D recording of the examination area, which establishes a reference system. A first spatial position of the examination area in the reference system is obtained by recording a first image of the series recordings and then registering it or by calculating it. Each further image of the series recordings is registered immediately after recording to obtain the current spatial position of the examination area. Differences in spatial position are compensated for at least approximately by changing geometric relationships of the imaging system (1).

The invention relates to an ultrasonic CT imaging system based on an improved ray tracing method. The ultrasonic CT imaging system comprises a full-enclosed ultrasonic transducer, a signal acquisitionmodule and a data processing and imaging module. When a processor in the data processing and imaging module executes computer programs stored in a memory, an implementation method comprises the following steps that human organs are scanned based on the full-enclosed ultrasonic transducer, and the transit time of sound waves is measured; the initial sound velocity distribution of a target is reconstructed; B-mode ultrasound imaging is conducted based on the sound velocity distribution of the target; the boundary information of organic tissues is extracted from B-mode ultrasound images; propagation paths of the sound waves are updated iteratively; and the sound velocity distribution of the target is updated iteratively. Compared with a traditional imaging scheme, while the ultrasonic CT imaging accuracy is ensured, the calculation amount is reduced, the reconstruction speed is improved, and the accuracy of the B-mode ultrasound images and the edge definition in an ultrasonic CT imagingresult are improved.

In a method and magnetic resonance (MR) apparatus to acquire MR data of a target region that includes a metal object, an MR sequence that includes at least one radio-frequency excitation to be emitted via a radio-frequency coil arrangement is used. A radio-frequency coil arrangement having multiple coil elements that can be controlled independently with different amplitude and / or phase is used. The amplitudes and / or phases of the coil elements that describe the polarization of the radio-frequency field are selected to at least partially reduce artifacts arising in the metal object due to the radio-frequency excitation, in comparison to a homogeneous, circular polarization of the radio-frequency field of the radio-frequency field in the target region.

A coil arrangement for a magnetic resonance scanner with at least one coil spacing layer including a two-dimensional matrix with a flexible, network structure is described. The two-dimensional matrix has a plurality of flexibly interlinked substructures. A method for producing a coil arrangement is also described. Also described is a magnetic resonance imaging system.

The technical scheme of the invention proposes an airborne receiver motion error compensation model for a GNSS-R dual-base SAR imaging system. The airborne receiver motion error compensation model belongs to the field of navigation, and comprises block division of an imaging region and extraction of positional information thereof. When different PRN satellite signal targets pass a target point, GNSS signals received by an airborne receiver are processed in real time, a serial number of a satellite is extracted and combined with a satellite stellar map at the acquisition moment, azimuth and elevation angles of the satellite are calculated, and a direct reflection signal is subjected to correlation processing. Displacement deviation generated by the airborne receiver during actual operationis compared, and phase error compensation is completed by utilizing the airborne motion error compensation model. Through directly utilizing an actual callback signal time delay value, primary phase compensation is performed in an operation line-of-sight direction of the receiver, a range direction compression result is obtained by carrying out correlation processing on a direct signal, secondaryphase compensation is performed in the heading direction, azimuth Fourier transform is performed, a module value is obtained after decoupling, and an imaging result with high resolution of a target region is obtained.

The invention discloses an image processing method and device, a movable platform and a machine readable storage medium. The method comprises the steps of obtaining an original training image and a target image corresponding to the original training image (201); performing a decorrelation operation on the original training image to obtain a multi-channel training image (202); and training a presetneural network according to the multi-channel training image and the target image (203). The method has efficient imaging performance, a high-quality imaging result is obtained, and the use experience of a user is very good.

The invention provides a seismic data velocity interpolation method and system; the method comprises the following steps: obtaining a velocity value of the seismic data; using Cubic Convolution to carry out interpolation operation for the obtained velocity value; carrying out imaging process for the seismic data according to the velocity value after interpolation operation. The method and system can improve the velocity interpolation precision, thus improving imaging result, and more accurately reflecting subsurface structure lateral variations.

An Anode for an X-ray tube, comprising an anode disk comprising a circular focal track region being adapted to, upon impact of accelerated electrons, emit X-rays in an emission direction transverse to an impacting direction of the electrons; a ring-like modulating absorption grid; wherein the modulating absorption grid encloses the focal track region; wherein the modulating absorption grid comprises wall portions of X-ray absorbing material, the wall portions being arranged such as to absorb X-rays emitted from the focal track region in the emission direction; wherein the modulating absorption grid comprises slits between neighboring wall portions, the slits being arranged along a circumferential direction of the modulating absorption grid at spacings (s) of less than 100 μm and the slits having a width (ws) in the circumferential direction of less than 50 μm.

An x-ray tube having a reduced spacing between the focal spot of an anode and an adjacent end wall of an evacuated enclosure is disclosed. This in turn positions the tube relatively closer to the chest wall of a patient during mammography procedures. In one embodiment, the x-ray tube comprises an evacuated enclosure having first and second ends interconnected by a cylindrical side wall. The evacuated enclosure includes a rotor assembly having a bearing assembly and a stem. An anode is rotatably supported by the stem of the rotor assembly and includes a target surface and an opposite second surface. The target surface is positioned to face the bearing assembly, while the second surface is positioned to face the first end of the evacuated enclosure, with no intervening structure interposed therebetween. A cathode is included to emit electrons for impingement on a focal spot of the focal track.

The invention discloses a least squares reverse time migration method based on multi-source hybrid dynamic coding. In multi-source coding least squares reverse time migration, a multi-source coding matrix is firstly used for converting a single-shot gather component into a super-shot gather, then the super-shot gather is used for defining a target function of an estimated refection coefficient; cross term noise is introduced into a least squares reverse time migration result, an encoder matrix at each stage is selected to serve as an orthogonal matrix, and each sub-question is formed by using a hybrid coding mode. According to the least squares reverse time migration method based on a bi-directional wave equation theory and an inverse theory provided by the invention, amplitude with more fidelity can be provided, the image is more focused, a seismic offset result with less false appearance is imaged, and thus seismic interpretation difficulty and a petroleum reservoir exploitation risk are reduced. Meanwhile, according to the multi-source coding method provided by the invention, enhancement of computation efficiency and suppression of cross item noise of coding can be well achieved during a least squares reverse time migration iteration process.

The invention discloses a DSN-based high-resolution two-dimensional ISAR imaging method. The method solves the problems that the 2D-FISTA algorithm has openness of optimal regularization term coefficient selection, a CV-DNN network lacks theoretical support and needs high space and time complexity, and DSN cannot solve the problems of main lobe width, high sidelobe and the like of an RD image. Themethod comprises the following implementation steps: obtaining wave number domain echoes in a two-dimensional matrix form and wave number domain echoes in a one-dimensional vector form of ISAR two-dimensional scattering point distribution; solving a one-dimensional vector form and a two-dimensional matrix form of two-dimensional scattering point distribution; building a DSN network; setting a loss function; performing DSN network training; and completing the ISAR high-resolution two-dimensional imaging based on the DSN. Based on a sparse signal reconstruction theory, an SALSA algorithm is constructed into a deep network, high-resolution two-dimensional ISAR imaging is realized, an ISAR image with good focusing and a clean background is obtained, and the method can be used for efficientlyperforming high-resolution two-dimensional ISAR imaging in batches in complex electromagnetic environments with target echo defects, noise and the like.

A method for improving a lithographic process for imaging a portion of a design layout onto a substrate using a lithographic projection apparatus, the method including: calculating a discrete pupil profile based on a desired pupil profile; selecting a discrete change to the discrete pupil profile; and applying the selected discrete change to the discrete pupil profile. The methods according to various embodiments disclosed herein may reduce the computational cost of discrete optimization from O(an) to O(n) wherein a is constant and n is the number of knobs that can generate discrete change in the pupil profile.

A three-dimensional (3D) seismic data set is divided into a plurality of 3D source wavefield subsets, each 3D source wavefield subset is stored in an array element of an array. For each array element,the associated 3D source wavefield is decomposed into a smaller data unit; data boundaries of the smaller data units are randomly shifted; a folding operation and a sample operator is applied to thesmaller data units to keep the smaller data units from overlapping; the folded smaller data units are smoothed to generate smoothed data; a quantization operation is performed on the smoothed data toproduce quantized data; and the quantized data is compression encoded to generate compressed data. The compressed data associated with each array element is decompressed to generate a 3D seismic output image.

The invention discloses a concrete member benchmark-free damage probability imaging positioning method which specifically comprises the following steps: S1, manufacturing a detected concrete member and intelligent aggregate sensors made of the same material, arranging an intelligent aggregate sensor array in the concrete member, and ensuring to cover a to-be-detected area of the structure; s2, each path intelligent aggregate in the array intelligent aggregates sequentially serves as a driver, ultrasonic longitudinal wave signals meeting the excitation requirement are loaded through a signal generator and a power amplifier, other intelligent aggregates serve as sensors to collect ultrasonic longitudinal wave focusing signals which are directly received and subjected to time inversion processing, and structural response is reflected; and S3, response signals directly received by similar sensing paths. The invention relates to the technical field of structural health monitoring. According to the non-benchmark damage probability imaging positioning method for the concrete member, the number of used sensors is reduced, and rapid, stable, effective, safe and accurate recognition and positioning of member damage are achieved.

The invention discloses a multi-scale multi-aperture optical imaging system. The multi-scale multi-aperture optical imaging system comprises a center optical imaging system and four secondary optical imaging systems having complete identical optical structures, wherein the center optical imaging system is a rotary symmetric system, the optical axis and the system center axis are superposed, the four secondary optical imaging systems are arranged at the back of the center optical imaging system, from the perspective of image cross sections, four optical axes of the secondary optical imaging systems are distributed on tip tops of a rectangle which takes the optical axis of the center optical imaging system as the center, and parallel lights emitted from different perspectives by a target are respectively imaged through the center optical imaging system and the four secondary optical imaging systems on different coordinate points on an image plane of one same detector. Independent multiple target images can be acquired by applying the multi-scale multi-aperture optical imaging system to acquire target object information, the center image resolution is higher than the secondary image resolution, images respectively have certain pixels superposed in the field of view, and the multi-scale multi-aperture optical imaging system can provide excellent support for subsequent data processing.

A computer-implemented method for simulating a scattered radiation field of a patterning device including one or more features, in a lithographic projection apparatus, the method including: determining a scattering function of the patterning device using one or more scattering functions of feature elements of the one or more features; wherein at least one of the one or more features is a three-dimensional feature, or the one or more scattering functions characterize scattering of incident radiation fields at a plurality of incident angles on the feature elements.

The invention discloses a compressive sensing imaging device and a compressive sensing imaging method. The compressive sensing imaging device comprises a carrier, a PSF (Point Spread Function) measuring system and an imaging system, wherein the PSF measuring system and the imaging system are arranged on the carrier. Due to adoption of the PSF measuring system, a first light beam emitted from a first light source passes through air / a water body and is received by a first photoelectric detection unit, then energy distribution information of a light spot affected by a PSF is received, a frequencyspectrum value of the PSF of the air / water body in a specific distance is calculated by a PSF calculation unit according to energy distribution of the light spots emitted from the first light sourceand energy distribution information of light spot imaging detected by the first photoelectric detection unit, a frequency spectrum value of the PSF of the air / water body corresponding to an imaging unit is calculated through a central processing unit, a micro lens in a spatial light modulator is adjusted according to the frequency spectrum value, then light intensity distribution to a detection target from the micro lens is identical to an original modulation matrix, and thus the influence of the PSF is inhibited.

An individualized imaging method, comprising the following steps: scanning an imaging subject mould; conducting calibration, rectification and optimization on the imaging system according to the information obtained after mould imaging; scanning the imaging subject with the calibrated, rectified and optimized imaging system; optimizing information obtained by scanning the imaging subject and the mould thereof to obtain higher quality imaging results and data analysis results; and applying the higher quality imaging results and data analysis results to optimize the mould for use in the next imaging. The individualized imaging method fully utilizes a priori knowledge, establishes a mould for an individual and uses the image data information of the mould to conduct calibration, rectification and optimization on the imaging system, and optimizes the image data information of the imaging subject, and further optimizes the mould. By repeating the above steps, the present invention can obtain higher quality imaging results and data analysis results.

The invention discloses a focused acoustic array imaging method and system. The method includes: acquiring echo data in an imaging area by using a single array element transmission and all array acquisition methods, transmitting and traversing all array elements, and obtaining all echo data as a full matrix Data; calculate the delay index table of the entire imaging area; take the main diagonal of the full matrix data as the benchmark, and calculate the reference image according to the delay index table; use the sub-diagonal data of the full matrix data, according to the delay index Table and the echo data corresponding to this sub-diagonal line calculate the focused image, and superimpose it with the reference image; continue to progress gradually to both sides until the superimposed focused image meets the image quality requirements. The focused acoustic array imaging method and system of the present invention not only improves the real-time processing speed of focused imaging, but also can obtain target images with better signal-to-noise ratio as required, greatly improving the imaging results of the acoustic array and improving the detection performance of the acoustic array.

A computer-implemented method for simulating a scattered radiation field of a patterning device including one or more features, in a lithographic projection apparatus, the method including: determining a scattering function of the patterning device using one or more scattering functions of feature elements of the one or more features; wherein at least one of the one or more features is a three-dimensional feature, or the one or more scattering functions characterize scattering of incident radiation fields at a plurality of incident angles on the feature elements.