摘要:
A method for Monte Carlo volume rendering in accordance with the present teachings includes: (a) tracing a plurality of light rays into a scene containing volumetric data, the light rays configured for simulating global illumination; (b) randomizing the scattering location and direction of the plurality of light rays through the volume, wherein a common sequence of random numbers is used in order for the scattering direction of each of the plurality of randomized scattered light rays to be substantially parallel; (c) computing at least one trilinearly interpolated and shaded sample along each of the plurality of randomized scattered light rays based on stored volumetric data, wherein at least a portion of the stored volumetric data used in at least a portion of the computing is configured for coherent access; and (d) rendering the volume with global illumination based on a plurality of iterations of the tracing, the randomizing, and the computing. Systems for Monte Carlo volume rendering are described.
摘要:
A method for Monte Carlo volume rendering in accordance with the present teachings includes: (a) tracing a plurality of light rays into a scene containing volumetric data, the light rays configured for simulating global illumination; (b) randomizing the scattering location and direction of the plurality of light rays through the volume, wherein a common sequence of random numbers is used in order for the scattering direction of each of the plurality of randomized scattered light rays to be substantially parallel; (c) computing at least one trilinearly interpolated and shaded sample along each of the plurality of randomized scattered light rays based on stored volumetric data, wherein at least a portion of the stored volumetric data used in at least a portion of the computing is configured for coherent access; and (d) rendering the volume with global illumination based on a plurality of iterations of the tracing, the randomizing, and the computing. Systems for Monte Carlo volume rendering are described.
摘要:
A method and system for integrating radiological and pathological information for cancer diagnosis, therapy selection, and monitoring is disclosed. A radiological image of a patient, such as a magnetic resonance (MR), computed tomography (CT), positron emission tomography (PET), or ultrasound image, is received. A location corresponding to each of one or more biopsy samples is determined in the at least one radiological image. An integrated display is used to display a histological image corresponding to the each biopsy samples, the radiological image, and the location corresponding to each biopsy samples in the radiological image. Pathological information and radiological information are integrated by combining features extracted from the histological images and the features extracted from the corresponding locations in the radiological image for cancer grading, prognosis prediction, and therapy selection.
摘要:
Robotic navigation is provided for nuclear probe imaging. Using a three-dimensional scanner (19), the surface of a patient is determined (42). A calibrated robotic system positions (48) a nuclear probe about the patient based on the surface. The positioning (48) may be without contacting the patient and the surface may be used in reconstruction to account for spacing of the probe from the patient. By using the robotic system for positioning (48), the speed, resolution and/or quality of the reconstructed image may be predetermined, user settable, and/or improved compared to manual scanning. The reconstruction (52) may be more computationally efficient by providing for regular spacing of radiation detection locations within the volume
摘要:
A nuclear probe and ultrasound transducer are interconnected, such as being in a same hand-held housing. The interconnection aligns the coordinate systems in a known spatial relationship. The ultrasound data is used to detect transducer offset or change in position without a tracking sensor. The radiation detected by the nuclear probe may be reconstructed into an image based on the detected transducer position since the nuclear probe moves with the ultrasound transducer. Both anatomical and functional imaging may be provided together without the complications of calibration and tracking. Where a therapeutic transducer is included, therapy may also be provided. The anatomical and functional information identifies the regions for treatment. The same device, already positioned correctly based on the functional and anatomical imaging, is then used for treatment with high intensity focused ultrasound.
摘要:
A method for managing a memory system for large data volumes includes providing a central memory management system comprising a memory management interface between applications and a memory of a programmed computer, maintaining a global priority list of data buffers allocated by the applications, storing decompressed data of the data buffers into a cache which is managed by the central memory management system using a separate priority list, and accessing the decompressed data of the data buffers in the cache.
摘要:
Subsets of volume data are sequentially stored for volume rendering from two dimensional textures. For example, pairs of adjacent two-dimensional images are loaded into RAM or cache. Strips of texture data are interpolated for polygons extending between the two-dimensional images. The strips or polygons are more orthogonal to a viewing direction than the two-dimensional images. After interpolating texture data from the two-dimensional images for a plurality of non-coplanar polygons, the texture data is rendered. The rendered information represents one portion of the three dimensional representation. Other portions are rendered by repeating the process for other pairs or subset groups of adjacent two-dimensional images. A lower cost apparatus, such as a programmed computer or a GPU with a limited amount of memory, is able to render images for three dimensional representations of very large three-dimensional arrays. The images may be rendered without copying volume data for different main axes.
摘要:
A memory manager interfaces between a rendering application and the driver controlling one or more memories. A multi-level brick cache system caches bricks in a memory hierarchy to accelerate the rendering. One example memory hierarchy may include system memory, AGP memory, and graphics memory. The memory manager allows control of brick overwriting based on current or past rendering. Since different memories are typically available, one or more memory managers may control storage of bricks into different memories to optimize rendering. Management of different memory levels, overwriting based on current or previous rendering, and an interfacing memory manager may each be used alone or in any possible combination.
摘要:
A method of segmenting an image includes representing an image by a grid with a plurality of nodes, terminals, and edges, the terminals including a source and a sink. The edges include n-links and t-links, where each n-link connects a pair of nodes, and the t-links connect a node to a terminal, and each t-link and n-link has an associated cost. The method includes initializing a node height table, a flow excess table, a t-link capacity table, and an n-link capacity table based on the t-link and n-link costs, and updating the node height table, the flow excess table, the t-link capacity table, the said n-link capacity table in parallel for all nodes until the flow excess table is zero for all nodes. The method steps are performed in parallel for all nodes on a graphics processing unit.
摘要:
An apparatus and method for visualizing volume rendered images relative to a viewing vector are provided, where the apparatus includes a processor, a detection unit in signal communication with the processor for detecting occluding contours of opacified structures in the image data, and a resampling unit in signal communication with the processor for generating curved multi-planar-reformat (MPR) resamplings that follow the occluding contours of the opacified structures; and the method includes receiving a volume rendered image, including distance values and surface normals for every pixel that is opacified, gathering all opacified pixels that are orthogonal to the viewing vector into a group of occluding points, and separating the group of occluding points into individual occluding contours.