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Method for eliminating scatter artefacts in computed tomography

A tomography, computer technology, applied in the field of scattering artifact, which can solve the problem that Monte Carlo simulation lacks important information about the scattering distribution that is meaningful to calculate and so on.

Inactive Publication Date: 2010-03-31
KONINKLIJKE PHILIPS ELECTRONICS NV
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Problems solved by technology

[0008] However, in the case of laterally truncated projections, the above techniques face big problems
In particular, the reconstructable field of view covers only a small fraction of the total object area, and thus Monte Carlo simulations lack important information needed to compute meaningful scattering distributions

Method used

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  • Method for eliminating scatter artefacts in computed tomography
  • Method for eliminating scatter artefacts in computed tomography
  • Method for eliminating scatter artefacts in computed tomography

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[0062] figure 1 The principle of scatter correction based on Monte Carlo simulation is shown. First, there is a fully projected dataset 1 . Subsampling 2 this fully projected dataset results in a coarse projected dataset 3 which results in a fast, coarse reconstruction 4 . The Monte Carlo scatter simulation procedure was then applied5, the result of which was a coarse scatter dataset6. These last 3 steps can be repeated iteratively to improve accuracy. Its result is upsampled9 and subtracted from the original fully sampled dataset1, which leads to the final reconstruction7. The principle of this scatter correction based on Monte Carlo simulations is known in the art.

[0063] figure 2 as well as image 3 The main sources of error introduced into the Monte Carlo simulation are shown when the x-ray projection of the object is at least partially truncated, wherein only a truncated image of the object with a limited field of view can be reconstructed. First, the missing re...

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Abstract

A method, a computer program as well as a corresponding apparatus for eliminating scatter artefacts that corrupt an image of an object using computed tomography, wherein X-ray projections of the object are at least partially truncated, whereas the method comprises the steps of: reconstructing a truncated image of the object with a limited field of view from the projections; constructing a model ofthe object in an extended field of view using the truncated image of the object; deriving a scatter estimate by means of Monte-Carlo simulation using the model of object; correcting a projection of the object for X-ray scatter based on the scatter estimate; reconstructing a scatter-corrected image using the corrected projections.

Description

technical field [0001] The present invention relates to a method of eliminating scatter artifacts spoiling images of objects using computed tomography and to corresponding devices. Furthermore, the invention relates to a computer program for implementing the method on a computer. Background technique [0002] Document WO 2006 / 082557 shows: a model estimation unit for estimating model parameters of an object model of an object by iterative optimization of deviations of forward projections by using the an object model and geometric parameters of the X-ray projection; and a scatter estimation unit for estimating the amount of scatter present in the X-ray projection by using the object model. [0003] Scattered radiation is a major source of image degradation and nonlinearities in cone beam computed tomography. It is particularly useful for system geometries with large cone angles and thus large irradiated areas, such as C-arm based volume imaging, where scattered radiation pr...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01T1/164
CPCG01T1/1648G06T11/005
Inventor J·维格特M·贝尔特拉姆
Owner KONINKLIJKE PHILIPS ELECTRONICS NV
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