Dynamic optimization of the signal-to-noise ratio of dual-energy attenuation data for reconstructing images

A technology of attenuation data and dynamic optimization, applied in the field of dual-energy X-ray imaging, which can solve problems such as count rate drop

Active Publication Date: 2009-04-22
KONINKLIJKE PHILIPS ELECTRONICS NV
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Problems solved by technology

As the level of the discriminator increases above 32keV, the count rate drops

Method used

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  • Dynamic optimization of the signal-to-noise ratio of dual-energy attenuation data for reconstructing images
  • Dynamic optimization of the signal-to-noise ratio of dual-energy attenuation data for reconstructing images
  • Dynamic optimization of the signal-to-noise ratio of dual-energy attenuation data for reconstructing images

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Embodiment Construction

[0071] The illustrations in the figures are illustrative. It should be noted that in different figures, similar or identical elements are denoted by the same reference symbols, or by corresponding reference symbols which differ only in the first numeral.

[0072] In the following, some theoretical background information on the effect of photon statistics on the signal-to-noise ratio in dual-energy imaging is first given.

[0073] Dual energy x-ray imaging introduces another additional processing step to the image processing steps of conventional x-ray or computed tomography (CT) systems. This processing step is based on the important insight that within the energy range of the diagnostic target (i.e. between approximately 10 keV and 150 keV), the energy dependence of the material's mass attenuation coefficient μ(E) can be attenuated by only two Basis function μ 1 (E) and μ 2 (E) to a good approximation. From a physical point of view, this can be understood as the sum of th...

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Abstract

Described is a method for dynamically optimizing the signal-to-noise ratio of attenuation data related to two different X-ray energies for reconstructing an image of an object under examination. The method comprises (a) estimating the thickness and the material composition of the object at a plurality of different projection angles, (b) for each of the various projection angles calculating for a variety of combinations of different first and second X-ray energies a corresponding common signal-to-noise ratio, (c) for each of the various projection angles choosing the first and the second X-ray energy causing the maximum corresponding common signal-to-noise ratio, and (d) for each of the various projection angles acquiring X-ray attenuation data of the object whereby the two X-ray energies are the X-ray energies causing a maximum signal-to-noise ratio assigned to the respective projection angle.

Description

technical field [0001] The invention relates to the field of dual-energy X-ray imaging. Thereby, two different images of the same object under examination can be obtained, whereby X-rays with different X-ray photon energies are used for each image. In particular, the present invention relates to a method for optimizing the signal-to-noise ratio of X-ray attenuation data associated with two different X-ray energies used to reconstruct a two-dimensional or three-dimensional image of an object under examination. [0002] The invention also relates to a computed tomography system that generates an X-ray image of an object under examination from attenuation data associated with two different X-ray energies. A computed tomography system includes a radiation source, a radiation detector and a rotatable gantry for jointly rotating the radiation source and the radiation detector around an object under examination. [0003] Furthermore, the invention relates to a data processing devic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01T1/29
CPCG01T1/2985
Inventor A·齐格勒E·罗塞尔
Owner KONINKLIJKE PHILIPS ELECTRONICS NV
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