73 results about "3d image reconstruction" patented technology

A cardiac functional analysis system reconstructs a 3D anatomical image volume using image frames acquired at predetermined cardiac phases over multiple cardiac cycles in response to a trigger derived from hemodynamic signals. A medical imaging system generates 3D anatomical imaging volume datasets from acquired 2D anatomical images. The system includes an image acquisition device for acquiring 2D anatomical images of a portion of patient anatomy in selectable angularly variable imaging planes in response to a synchronization signal derived from a patient blood flow related parameter. A synchronization processor provides the synchronization signal derived from the patient blood flow related parameter. An image processor processes 2D images acquired by the image acquisition device of the portion of patient anatomy in multiple different imaging planes having relative angular separation, to provide a 3D image reconstruction of the portion of patient anatomy.

A method for imaging objects in a highly scattering turbid medium comprises: using a group of sources and detectors to generate a plurality of emergent energy waves from the medium, determining the intensity data of the emergent energy waves and processing the intensity data by using an image reconstruction algorithm. Arrangement of sources-detectors may be in parallel (transmission and/or backscattering) geometry or in cylinder geometry. The reconstruction algorithm is a novel hybrid dual Fourier tomographic algorithm for a fast 3D image reconstruction. The forward models are the radiative transfer model based on the cumulant solution of the radiative transfer equation or the diffusion model based on the approximate diffusion equation.

The invention relates to a method and device for reconstructing a 3D image data set of a moving object from a set of projection images, which were recorded at least partially one after the other from different projection directions. The projection images are hereby assigned by ECG gating to a motion phase of the object in each instance and an incomplete 3D image of the object is computed in this motion phase from these few projection images using local tomography. Motion fields are determined from these 3D images and are used during the final 3D image reconstruction for motion corrections.

In a method for generating an image of an examination subject with a tomography-capable X-ray device, particularly a computed tomography device, having a multi-row X-ray detector array, an X-ray radiator that rotates about a system axis and emits a conical x-ray beam, and a positioning device by means of which the subject is positionable relative to the X-ray radiator in different z-positions in a direction parallel to the system axis, the image is reconstructed from the raw data that are generated from the X-ray radiator. Raw data are generated from both a rotation scan and a linear scan. In the linear scan, all transmission values for the image reconstruction are acquired in one continuous linear scanning movement, so that the rotation scan can be picked up while the X-ray radiator is in continuous rotation. A topogram that is executed prior to the actual rotation scan for the purpose of selecting a region of interest of the subject for the subsequent rotation scan can be utilized as a linear measurement dataset. A particularly rapid acquisition of initial data for the subsequent 3D image reconstruction occurs.

An apparatus for reconstructing appearance of a dynamic object and automatically skinning the dynamic object, includes an image capturing unit configured to generate a multi-view image and multi-view silhouette information of a dynamic object and a primary globally fitted standard mesh model; and a 3D image reconstruction unit configured to perform global and local fitting on the primary globally fitted standard mesh model, and then generate a Non Uniform Rational B-Spline (NURBS)-based unique mesh model of the dynamic object. Further, the apparatus includes a data output unit configured to generate and output a final unique mesh model and animation data based on the NURBS-based unique mesh model of the dynamic object and at least two pieces of operation information about the dynamic object.

The present invention is directed to a system and method for dual-energy (DE) or multiple-energy (spectral) cone-beam computed tomography (CBCT) using a configuration of multiple x-ray sources and a single detector. The x-ray sources are operated to produce x-ray spectra of different energies (peak kilovoltage (kVp) and/or filtration). Volumetric 3D image reconstruction and dual or triple energy 3D image decomposition can be executed using data from the CBCT scan. The invention allows for a variety of selections in energy and filtration associated with each source and the order of pulsing for each source (“firing pattern”). The motivation for distributing the sources along the z direction in CBCT includes extension of the longitudinal field of view and reduction of cone-beam artifacts.

This invention discloses methods and apparatuses for 3D imaging in Magnetoencephalography (MEG), Magnetocardiography (MCG), and electrical activity in any biological tissue such as neural/muscle tissue. This invention is based on Field Paradigm founded on the principle that the field intensity distribution in a 3D volume space uniquely determines the 3D density distribution of the field emission source and vice versa. Electrical neural/muscle activity in any biological tissue results in an electrical current pattern that produces a magnetic field. This magnetic field is measured in a 3D volume space that extends in all directions including substantially along the radial direction from the center of the object being imaged. Further, magnetic field intensity is measured at each point along three mutually perpendicular directions. This measured data captures all the available information and facilitates a computationally efficient closed-form solution to the 3D image reconstruction problem without the use of heuristic assumptions. This is unlike prior art where measurements are made only on a surface at a nearly constant radial distance from the center of the target object, and along a single direction. Therefore necessary, useful, and available data is ignored and not measured in prior art. Consequently, prior art does not provide a closed-form solution to the 3D image reconstruction problem and it uses heuristic assumptions. The methods and apparatuses of the present invention reconstruct a 3D image of the neural/muscle electrical current pattern in MEG, MCG, and related areas, by processing image data in either the original spatial domain or the Fourier domain.

In the imaging space provided by a panoramic imaging apparatus, a phantom is arranged. The phantom is located to a predetermined tomographic plane and includes markers which image known positional information with an X-ray beam. The X-ray beam from an X-ray source is acquired as X-ray transmission data by a detector, and a panoramic image is produced using the data. Based on known positional information of the markers and information of marker positions in the panoramic image, distance information (Rs, Rd) between the X-ray tube and the detector and height information (B1) of the X-ray tube to the detector are calculated. From this calculated results and the acquired data, parameters (Δx/ΔFi, θ, Δθ/ΔFi, D, A, CX, CY) defining positional relationships among the X-ray tube, the detector, and the tomographic plane are calculated such that amounts of changes in the position connecting the X-ray tube and the detector are considered in the parameters. This allows the parameters to be calibrated for 3D image reconstruction.

A method (100) of blood vessel extraction for rotational angiographic X-ray sequences, comprising obtaining a 2.5D vesselness detection response in 3D (208). The method (100) utilizes the projection matrices to realize the correspondence among different image frames to extract low level image features for subsequent segmentation and 3D image reconstruction.

The invention discloses an automobile or mobile device 3D image acquisition and naked-eye 3D head-up display system and a 3D image processing method. The automobile or mobile device 3D image acquisition and naked-eye 3D head-up display system includes a head-up display, a group of naked-eye 3D screens, a group of bionic 3D viewpoints, a 3D intelligent center, an automobile left side and right side bionic 3D viewpoint sight glass and an intra-automobile naked-eye 3D rearview mirror. With the automobile or mobile device 3D image acquisition and naked-eye 3D head-up display system and the 3D image processing method of the invention adopted, when a driver drives an automobile or uses a mobile device, he or she does not need to leave his or her sight from a road ahead to acquire information, and the driver can judge the relative distances of his or her automobile and other automobiles or pedestrians in adjacent lanes or lanes behind the his or her automobile according to 3D images which come from one group of bionic 3D viewpoints, are played by one group of naked-eye 3D screens in the automobile and have been subjected to bionic 3D image reconstruction technological processing; and an automobile naked-eye 3D playing platform can be provided for a 3D navigation map provided by the invention and other 3D navigation maps made by a third party.

The invention discloses a total internal reflection microscopy device based on free-form surface shaping.The device comprises a light source and a line polarized light generating module, a free-form surface focusing module, a digital microscopy refection module, an optical enlargement transmission module and a fluorescence imaging module which are sequentially arranged along a light path, wherein the line polarized light generating module is used for converting light beams emitted by the light source into line polarized light; the free-form surface focusing module is used for converting the line polarized light into annular focused light; the digital microscopy refection module is used for selecting annular focused light reflected in an area; the optical enlargement transmission module is used for achieving total internal reflection illumination of the light beams; the fluorescence imaging module is used for exciting a sample to emit fluorescent light and collecting a fluorescent light signal image.The invention further discloses a total internal reflection microscopy method based on free-form surface shaping.According to the total internal reflection microscopy method and device based on free-form surface shaping, no mechanical vibration module is adopted, scanning is conducted more stably, and noise is lower; the utilization rate of laser energy is higher, and an imaging view field is more uniform; a DMD control controls scanning, the angle is more accurate, and it is helpful to achieve layered scanning and 3D image reconstruction.

An underwater camera system includes a projector operable to project a pattern of electromagnetic radiation toward a target object. The electromagnetic radiation includes at least three different wavelengths. A sensor directed toward the target object receives reflected electromagnetic radiation from the target object and stores corresponding image data received from the sensor. One or more processors process the image data to compute a refractive normal according to a wavelength dispersion represented by differences in the image data, and to compute an interface distance corresponding to a distance from a center point of the sensor to a first refractive interface nearest the sensor according to the refractive normal. The processors generate a 3D representation of the target object by back projecting each pixel of the image data at the first, second, and third wavelengths in order to determine an object point location according to the refractive normal and interface distance.

A multimodality imaging phantom is disclosed which is useful for calibrating devices for imaging vascular conduits. The phantom is compatible with X-ray, ultrasound and magnetic resonance imaging techniques. It allows testing, calibration, and inter-modality comparative study of imaging devices, in static or dynamic flow conditions. It also provides a geometric reference for evaluation of accuracy of imaging devices. The tissue-mimicking material is preferably an agar-based solidified gel. A vessel of known desired geometry runs throughout the gel and is connected to an inlet and outlet at its extremities for generating a flow circulation in the vessel. Said phantom also contains fiducial markers detectable in the above-mentioned modalities. The markers are preferably made of glass and are embedded in a layer of agar gel containing a fat component. The markers are implanted at precise known locations to allow identification and orientation of plane views, and they can be used for calibration, resealing and fusion of 3D images obtained from different modalities, and 3D image reconstruction from angiographic plane views. Also disclosed is a process for manufacturing said phantom.

The present invention provides a system for generating images of multi-views. The system includes a processing unit; an image range calculating module coupled to the processing unit to calculate the ranges of a background image and a main body image of a 2D original image of an article; a depth model generating module coupled to the processing unit to generate a depth model according to an equation; an image cutting module coupled to the processing unit to cut the 2D original image of the article or the depth model to generate a cut 2D image of the article or a depth model with a main body image outline; a pixel shifting module coupled to the processing unit to shift every pixel in the main body image of the 2D original image of the article according to the depth model with the main body image outline to obtain shifted main body images of multi-views; and an image synthesizing module coupled to the processing unit to synthesize the shifted main body images of multi-views and background figures of multi-views to obtain final images of multi-views for 3D image reconstruction.

A system for low dose x-ray imaging provides for dynamic generation of an x-ray beam with specific shape, and dynamic tracking of a detector with said beam. The detector is rotatable, and translatable along two orthogonal axes, and may mount with a circular detector tray, the tray rotating around a rotation axis. Specific detector shapes include an elongated rectangular matrix, for example with additional detector cells near the rotation center to provide an increased area of continuous detection. Dynamic low-dose x-ray tomosynthesis or limited-angle tomographic imaging is enabled via simultaneous x-ray tube and detector motions during examination, such as fluoroscopic examination of a human body. Data acquired at multiple projection angles is input to a 3D image reconstruction algorithm that provides a refreshed 3D data set during continuing examination. The system may thus also automatically track a point in three-dimensional space, for example continuously locating the tip of a catheter.

The invention discloses a probe type online three-dimensional imaging detection system which comprises a crystal growth reactor, a three-dimensional imaging probe, a light source and a strobe controller, a computer for processing an image, and a display, wherein the three-dimensional imaging probe is used for transmitting a 2D image to the computer; the computer is used for firstly deleting a background by using a splitting technology and then identifying corresponding points and lines from the 2D image by using an angle/edge/line detection technology; for few angles/lines which are detected difficultly, indistinct angles/lines are predicted/estimated by using molecule modeling and a crystal shape model on the basis of the obtained angles and lines, 3D image reconstruction is realized by using the determined points and lines, then particle description characteristics of 3D crystals are obtained by combining with solution parameters measured online, and finally, the control and the amplification of a crystallization process in a reactor are realized by using a crystalline form grain number balancing model and computational fluid mechanics. The system and the method provided by the invention are capable of directly acquiring the image from the solution and realizing the reconstruction of the 3D crystalline form, and are high in image processing speed.

A 3D C-shaped arm automatic dosage control method belongs to the technical field of medical apparatus and instruments and is characterized in that a 3D C-shaped arm can perform 3D image reconstruction of a 2D sequence image; in an acquisition process of the 2D sequence image, accurate guidance can be provided for automatic exposure dosage of the next image according to the brightness value of the previous image. In an acquisition process of 2D sequences, in particular to human body lumbar vertebra, a C-shaped arm has a direct exposure area in a rotation acquisition process due to the geometrical features of the C-shaped arm, and the direct exposure area can directly affect calculation of the brightness value of an image area-of-interest; gray level distribution of an image is calculated through a probability statistics method, recognition and division of the area-of-interest can be achieved, and the brightness mean value of the image is calculated; and the accurate guidance can be provided for the exposure dosage of the next image through the calculation result. The advantage of the invention is that the accuracy of the calculation result can be ensured by calculating the gray level distribution through the probability statistics method.

A 3D image reconstructing method using X-ray volume photography acquires a plurality of X-ray area array images of the object interested according to locating principle of the digital photographic measurement. A plurality of mark points of the known 3D positions are simultaneously taken in the X-ray photo, and the method uses the coordinates of the mark points in the rectangular coordinate system for volume photographic 3D image reconstruction and the coordinates of the mark points in the X-ray photo coordinate system to construct a transforming relationship of the two coordinate systems. The method determines the path and the position of each X beam by using the transforming relationship and gets all voxels of each X-ray passing the object interested. The method uses the voxel g and the pixel G of the same X beam path to get Radon set of equations to determine the gray scale value of voxel g, then determines the gray scale values of all voxels g by computer and reconstructs a 3D volume image of the object interested based on the gray scale value of voxel g.

The present invention provides a method for repairing incomplete 3D depth image using 2D image information. The method includes the following steps: obtaining 2D image information and 3D depth image information; dividing 2D image information into 2D reconstruction blocks and 2D reconstruction boundaries, and corresponding to 3D reconstruction of blocks and 3D reconstruction boundaries; analyzing each 3D reconstruction block, partitioning into residual-surface blocks and repaired blocks; and proceeding at least one 3D image reconstruction, which extends with the initial depth value of the 3D depth image of each of the residual-surface block and covers all the corresponding repaired block to form a repair block and to achieve the purpose of repairing incomplete 3D depth images using 2D image information.