Method for realizing three-dimensional back projection by graphics processor

A graphics processor and back-projection technology, applied in the field of medical image reconstruction, can solve the problem of slow image reconstruction speed

Inactive Publication Date: 2011-06-29
SHENYANG NEUSOFT MEDICAL SYST CO LTD +1
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Problems solved by technology

[0007] Aiming at the disadvantages that the methods in the prior art are not suitable for the reconstruction of medical CT images with higher layers or the image reconstruction speed is slow, the technical problem to be s

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  • Method for realizing three-dimensional back projection by graphics processor
  • Method for realizing three-dimensional back projection by graphics processor
  • Method for realizing three-dimensional back projection by graphics processor

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[0050] like figure 1 As shown, the present invention utilizes the graphics processor to realize the method for three-dimensional back projection, comprising the following steps:

[0051] Save the projection data collected by the CT scanner in the host memory, and calculate the CT image to be reconstructed, that is, the sampling value of the Hermite coefficient and the helical weight of each pixel in the target image;

[0052] Copy the projection data in the host memory and the sampling values ​​of the Hermite coefficients and helix weights of each pixel to the graphics processor's video memory, and bind the data in the video memory to the texture;

[0053]Perform 3D back-projection in GPU to obtain CT reconstructed image;

[0054] Copy the CT reconstructed image obtained above to the host memory.

[0055] The procedure for calculating the hermite coefficient is as follows:

[0056] For the reconstructed image points (X, Y), the start and end projections are VS respectively ...

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Abstract

The invention relates to a method for realizing three-dimensional back projection by a graphics processor, comprising the following steps: storing projection data collected by a CT (Computed Tomography) processor in a host memory; meanwhile, calculating the Hermite coefficient of each pixel point and the sampling value of a spiral weight in a CT image to be reconstructed, i.e. a target image; copying the projection data in the host memory, the Hermite coefficient of each pixel point and the sampling value of the spiral weight into the display cache of the graphics processor; carrying out texture binding to data in the display cache; carrying out three-dimensional back projection in GPU (Graphics Processing Unit) to obtain a CT reconstruction image; and copying the obtained CT reconstruction image into the host memory. By applying the method disclosed by the invention, the three-dimensional back projection is realized in the GPU, and figures are chosen by virtue of a GPU three-dimensional array storage and three-dimensional texture binding technology based on a float4 data type as the basic element of a two-dimensional parameter array, thereby avoiding the problem that the figures are slowly chosen because parameter arrays are excessive so as to cause that GPU cache utilization is low so that operation efficiency is further improved and a satisfied result is obtained.

Description

technical field [0001] The invention relates to medical image reconstruction technology, in particular to a method for realizing three-dimensional back projection by using a graphics processor. Background technique [0002] The speed of 3D reconstruction of CT images has always been a hot topic in the field of reconstruction algorithms. At present, the main bottleneck restricting the speed of 3D reconstruction is the back projection part. How to improve the calculation speed of this part from the aspects of software and hardware has always been the focus of attention. [0003] Currently, processors in mainstream computers are mainly central processing units (CPUs) and graphics processing units (GPUs). Traditionally, the GPU is only responsible for graphics rendering, while most of the processing is handed over to the CPU. As early as 2000, some people began to put part of the CPU work on the GPU to accelerate the completion of certain large-scale data parallel tasks with hi...

Claims

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Application Information

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IPC IPC(8): G06T17/00
Inventor 董国峰刘长坤赵江魏
Owner SHENYANG NEUSOFT MEDICAL SYST CO LTD
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