296results about How to "Reduced imaging time" patented technology

There is provided an ophthalmologic apparatus having a tracking function that can select a fundus image that is less affected by eye motion to reduce burdens on an operator/a patient in fundus imaging, wherein the ophthalmologic apparatus picks up a first fundus image (202), extracts a characteristic point as a template from the first fundus image (203), executes pattern matching on a second fundus image (205) to determine presence/absence of eye motion, and decides a tracking template image (207).

An under-sampling apparatus for MR image reconstruction by using machine learning and a method thereof, an MR image reconstruction device by using machine learning and a method thereof, and a recoding medium thereof are disclosed. The disclosed under-smapling apparatus includes: a setting portion that sets a region corresponding to a center of the k-space image as a first region and remaining regions as a second region; and an under-sampling portion that full-samples the first region and under-samples the second region, wherein in the under-sampling performed in the second region, lines are selected at regular intervals and then only the selected line is full-sampled. According to the under-sampling apparatus, a high-resolution MR image can be acquired while reducing imaing time.

A magnetic resonance imaging (MRI) water-fat separation method includes acquiring in-phase image raw measurement data and out-of-phase image raw measurement data with an MRI device, reconstructing an in-phase image and an out-of-phase image according to a system matrix and the raw measurement data using the penalty function regularized iterative reconstruction method, and calculating water and fat images according to the in-phase image and the out-of-phase image. The use of the penalty function regularized iterative method eliminates the need for k-space raw measurement data with a 100% sampling rate, thereby reducing the MRI scan time, shortening the entire imaging time, and improving the efficiency of the MRI device.

A radiographic apparatus includes a first grating, a second grating, a scanning unit, and a radiological image detector. The second grating includes a periodic form that has a period which substantially coincides with a pattern period of a radiological image formed a radiation having passed through the first grating. The scanning unit relatively displaces the radiological image and the second grating to a plurality of relative positions at which phase differences between the radiological image and the second grating are different each other. The radiological image detector detects the radiological image masked by the second grating. The scanning unit includes a driving unit that drives one of the first grating and the second grating relatively to the other in a pattern arrangement direction of the radiological image and a plurality of elastic members that has natural frequencies different from each other.

Mapping of myelin water content in white matter may provide important information for early diagnosis of multiple sclerosis and the detection of white matter abnormality in other diseases. It is disclosed here that free induction decay (FID) of each voxel at multiple slice locations is acquired in the brain using an echo-planar spectroscopic imaging (EPSI) pulse sequence. The multi-slice EPSI acquisition is designed to have a short first echo time (˜2 ms) and echo-spacing (˜1 ms) in order to acquire multiple sampling points during the fast decay of the myelin water signal. Multi-compartment analysis is then applied to the FID in each pixel using a 3-pool model of white matter to obtain quantitative maps of the myelin water fraction. Using this technique, the MR data for whole brain mapping of the myelin water can be acquired in less than 10 minutes, making this technique feasible for routine clinical applications.

Provided is an optical tomographic imaging apparatus that is capable of shortening a period of time of focusing at multiple focus positions when images split in a depth direction are obtained by zone focusing. The optical tomographic imaging apparatus includes: a focus position setting device for splitting a zone within a predetermined imaging depth range into multiple focus zones so as to set multiple focus positions; a reference position setting device for setting at least two reference positions in an imaging depth direction within the predetermined imaging depth range; and a focus controlling device for performing focusing at the multiple focus positions sequentially based on focus position information generated by the focus position setting device and determining a focus condition of an in-focus state for the at least two reference positions set in advance by the reference position setting device.

The invention discloses an acoustic multi-beam-based remote real-time monitor of fish shoals in a deep water net cage, relating to a monitoring device. The invention provides the acoustic multi-beam-based remote real-time monitor of the fish shoals in the deep water net cage which has flexible marine operation, easy placement and strong anti-wave capability. The acoustic multi-beam-based remote real-time monitor is provided with a detection signal transmitting and echo collection device, a data analysis and image display device and a data wireless transmission device. The detection signal transmitting and echo collection device is provided with an annular transducer array and a control box, and the annular transducer array is provided with single beam transducer array elements; the control box is provided with a power supply, a controller, a detection signal generator, a power amplifier, a signal collection and preservation circuit and a signal pre-treatment circuit. The data analysis and image display device is used for realizing the remote detection and the control operations on a bank station, carrying out the analysis of the received monitoring data of the fish shoals in the net cage and carrying out the image display of the result. The data wireless transmission device is connected with the detection signal transmitting and echo collection device and the data analysis and image display device.

The invention discloses a photon counting laser radar based on composite pseudo-random coding. The photon counting laser radar is composed of a signal generator, a light intensity modulation device, alaser device, a beam splitter prism, a circulator, an optical system, a scanner, a GM-APD single-photon detector, a photodiode, a photon counting module, and a signal processing module. An overall structure of a transmitting-receiving-same-path type optical reduced system is employed and a scanner is used for carry out scanning and transmitting a laser pulse string, so that the field angle of thelaser radar is extended. After processing on a laser signal transmitted by an optical system by the beam splitter prism, one part of the signal irradiates the photodiode directly to form a light trigger signal and the other part of signal is scanned by the scanner and then the scanned signal is irradiated on a target; an echo signal reflected by the target enters the scanner, the processed signalreturns to a second port of the circulator by the optical signal and enters the GM-APD single-photon detector through a third port of the circulator; the GM-APD single-photon detector records an echosequence and generates a stopping signal; and a detection result recorded by the photon counting module is transmitted to the signal processing module for follow-up processing and flight time of a pulse string is obtained.

The relative position of the surrounding vehicle to the traveling vehicle is determined from respective position information of the traveling vehicle and the surrounding-vehicle obtained through communication between vehicles. The processing area of the image picked up by the camera is restricted on the basis of this relative position. By comparing the template that is obtained with a scale-transfer from the previously-memorized template on the basis of the position information of the vehicle to the image of the vehicle with an image matching, the precious position of the surrounding vehicle is detected. Thereby, the passenger protection devices are operated. Accordingly, the processing time of image data picked up by the camera can be properly shortened and the accuracy of recognition of obstacles can be improved.

The invention, which belongs to the technical fields of security inspection equipment and image processing, discloses an active terahertz security inspection imaging method and system. The security inspection imaging system is characterized in that a data acquisition and processing system is connected with a terahertz transmitter, a terahertz linear array detector and a band-shaped beam scanning control unit respectively; a beam splitter is connected with a beam shaping optical assembly, the terahertz linear array detector and a terahertz focusing optical assembly respectively; and the band-shaped beam scanning control unit is connected with the terahertz focusing optical assembly, the band beam scanning control unit, and a tested target. In addition, according to the active terahertz security inspection imaging method, on the basis of a mode of terahertz radiation emitted by a terahertz source, one-dimensional scanning of a band-shaped beam focusing beam, and receiving by a linear array terahertz detector, irradiation and scanning of the whole target plane are completed rapidly to achieve an objective of rapid imaging and checking on a target. With the active terahertz security inspection imaging system, the imaging quality is improved. Because of the one-dimensional scanning way, the imaging time is saved; and with the array detector, the circuit system structure is simplified, the system cost is lowered, and the expenditure is reduced.

The invention provides a high-efficiency super-resolution imaging device and method with regional management, and aims at solving the problem that an existing super-resolution imaging device and method is long in imaging time and low in resolution. The imaging device comprises an imaging lens group, a high-resolution detector, an image storage module, an image pre-processing module, an image super-resolution reconstruction module and an image output display module connected successively, wherein the image super-resolution reconstruction module is composed of an image regional management sub-module and a dictionary training and regional reconstruction sub-module. The imaging method comprises the following steps of obtaining optical signals of a practical scene; obtaining low-resolution images; storing the low-resolution images; preprocessing the images; carrying out regional image management; training dictionaries and reconstructing super-resolution areas, and splicing images of the reconstructed super-resolution sub-regions. The imaging device and method can be used to improve the imaging resolution effectively and shorten the imaging time, and applied to the fields including video monitoring, satellite remote-sensing imaging and medical imaging.

A first pulse sequence is executed on an imaging portion of an object to be examined using a multiple receiving coils including a plurality of receiving coils to obtain sensitivity images 701 to 703, each of n in number, which is smaller than the number of examination image. When those sensitivity images are calculated, NMR signals are measured only in a low-frequency region of a k space. Next, a second pulse sequence is executed while phase encoding steps are thinned out to acquire examination images 704 and 705, each of m in number (m>n), of the object with each receiving coil. When sensitivity distributions 707 and 708 are generated on the basis of sensitivity images 701 to 703, if a sensitivity distribution on a slice corresponding to examination images 704 and 705 is not yet measured, it is calculated with a slice interpolation processing on the basis of sensitivity distributions 701 to 703, and an aliasing artifact in examination images 704 and 705 are removed using sensitivity distributions 707 and 708 with a matrix calculation.

In order to improve image quality in MRI using an EPI method without extending imaging time excessively, reference data is acquired in the absence of substantial phase encoding gradients by using an EPI sequence in combination with an echo shift (ETS) method, at times related to the timing of echo signals for image data. The reference data is used for phase correcting the image data acquired with application of phase encoding. The reference data can be measured for a single shot, or a few shots, and used to estimate reference data for the rest of the shots in which imaging data is acquired.

The invention provides a correlated imaging system used for carrying out correlated imaging on an object to be imaged through a thermal light source. The correlated imaging system comprises an object arm light path and a first reference arm light path, wherein the object arm light path is internally provided with a first barrel detector and the object to be imaged; the first barrel detector samples a total light field intensity signal Sm, passing through the object to be imaged, in the object arm light path; the first reference arm light path is provided with a reference detector device for sampling the distribution information of the light field intensity of the first reference arm light path; the reference detector device comprises at least one reference detector unit; each reference detector unit comprises a timing sequence controller and a plurality of reference detectors with the spatial resolving power; the reference detectors are controlled by the timing sequence controller; the reference detectors are exposed in sequence for sampling under the control of the timing sequence controller. As the reference detectors are alternately exposed in time sequence, the exposure frame rates can be overlapped, limitation of existing reference detectors on the sampling speed is broken through, the sampling speed is greatly increased, and the imaging time is shortened.

The invention discloses a compressed sensing magnetic resonance imaging method controlled by a radio-frequency pulse, and relates to the magnetic resonance imaging method. The invention provides the compressed sensing magnetic resonance imaging method controlled by the radio-frequency pulse, wherein the compressed sensing magnetic resonance imaging method controlled by the radio-frequency pulse is capable of controlling a space K to spread spectrum easily. The method includes the spectrum spreading to the space K from the radio-frequency pulse, undersampling at random and image reconstruction. In the magnetic resonance imaging, the radio-frequency pulse of linear frequency modulation is exerted along the phase encoding direction to control the energy diffusion of magnetic resonance imaging data space. The undersampling at random is carried out to the imaging data with spread spectrum, and sampling time is reduced. In terms of the undersampling data, suggested fast reconstruction algorithm is adopted to carry out sparse reconstruction to the imaging. Due to the fact that radio-frequency pulse sequence is utilized to carry out the spread spectrum of the space K, compared with space K with a shim coil, the controllable property of the spread spectrum of the space K is good. The purposes of reducing imaging time and accelerating the magnetic resonance imaging are achieved by adopting the methods of undersamping the magnetic resonance signal at random and the image reconstruction algorithm.

Systems and methods for identifying the relative contribution of fat and water signals in a magnetic resonance (“MR”) image including an algorithm operable for selecting an image signal model, selecting a scan parameter, forming a bias field estimate, applying a bias correction to a phase image, estimating the signal fraction of fat and water at each of a plurality of voxels, and forming a fat-suppressed image, a water-suppressed image, or a combination of a fat-based image and a water-based image. The (“MRI”) fat suppression systems and methods requiring only a single image acquisition including an algorithm operable for selecting a relative phase of approximately θ=π/2 or another suitable relative phase, employing an expectation maximization algorithm to classify the phase of the complex image, and projecting complex vectors into fat and water components to obtain fat and water images.

The invention belongs to the technical field of missile-borne SAR imaging, and particularly relates to a missile-borne SAR forward-squint imaging method based on a GPU. The method comprises the specific steps that the work parameter of a synthetic aperture radar is set on a GPU side, and stored in the GPU, and SAR raw echoed data are stored in the GPU in a matrix mode; on the GPU side, distance direction processing is carried out on an SAR raw echoed data matrix, and distance orientation two-dimensional time domain data are obtained; on the GPU side, zero padding expansion is carried out on a distance orientation two-dimensional time domain data matrix in the azimuth, and a distance orientation two-dimension time domain data matrix of Na'*Nr is obtained after azimuth zero padding expansion; on the GPU side, azimuth processing is sequentially carried out on the distance orientation two-dimension time domain data matrix obtained after azimuth zero padding expansion, and focused SAR image data are obtained.