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CUDA-based medical image three-dimensional reconstruction method

A technology of three-dimensional reconstruction and medical image, applied in the field of three-dimensional reconstruction of medical image, can solve the problem of giving up flexibility and so on

Inactive Publication Date: 2018-09-28
BEIJING UNIV OF TECH
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  • Application Information

AI Technical Summary

Problems solved by technology

Although the above-mentioned GPU-based ray casting algorithm speeds up the volume rendering speed, greatly exceeding the algorithm that only runs on the CPU, but in order to achieve the ideal rendering speed, the flexibility of programming is given up.

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Embodiment 1

[0071] The key to the implementation of the ray casting algorithm on CUDA is to be able to use the GPU to complete the traversal, sampling and calculation of the volume data, and to mix the obtained sampling values ​​to produce the final reconstruction result.

[0072] To implement the ray casting algorithm with CUDA, it is necessary to declare a kernel function kernel to traverse volume data, equidistant sampling in the light direction, and cumulative calculation of color values. In the implementation process, each ray is equivalent to a thread, and multiple threads can be executed in parallel, so that multiple rays can be calculated in parallel. Use the loadRawFile function to read volume data on the CPU host side and store it in the system memory; then copy the volume data from the system memory to the global memory on the GPU device side through the system bus, and allocate thread blocks and threads according to the size of the volume data , in the kernel function, each ra...

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Abstract

The invention provides a CUDA-based medical image three-dimensional reconstruction method. The key to realization of a ray casting algorithm on a CUDA is that a GPU can be utilized to complete traversal, sampling and calculation of volume data, and obtained sampling values are mixed to generate a final reconstruction result. Through the technical scheme, on the premise of guaranteeing a satisfyingreconstruction effect, the efficiency of the algorithm is improved, and real-time drawing is more fluent.

Description

technical field [0001] The invention belongs to the field of image processing, in particular to a three-dimensional reconstruction method of medical images based on CUDA. Background technique [0002] The volume rendering technology of 3D medical data is of great significance in visualization. Since most medical image data are regular structured volume data (Structured Regular Volume Data), distributed on the 3D grid points composed of cubes or cuboids, therefore The research contents of this paper are all around the regular structured volume data. For the volume rendering of the regular data field, this paper adopts the typical ray casting algorithm (Ray Casting) in the volume rendering algorithm. Since the ray casting algorithm is only closely related to the number of projected rays, it is especially suitable for volume rendering of 3D data fields with large data fields and relatively regular data sets. The principle of the ray casting method is relatively simple, the pr...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T15/04G06T15/83G06T17/10G06T17/20
CPCG06T15/04G06T15/83G06T17/10G06T17/20
Inventor 杜金莲张鹏苏航金雪云
Owner BEIJING UNIV OF TECH