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Iterative reconstruction of CT images without conditioning

An iterative, image data technique, applied in the field of iterative reconstruction of CT images without conditioning

Inactive Publication Date: 2011-12-07
SIEMENS AG
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Problems solved by technology

However, using the classical FBP method has the problem of having so-called low-frequency cone-beam artifacts and helical artifacts due to the way it works in approximation

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  • Iterative reconstruction of CT images without conditioning
  • Iterative reconstruction of CT images without conditioning
  • Iterative reconstruction of CT images without conditioning

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Embodiment Construction

[0026] figure 1 Firstly, a first computed tomography system C1 with an image reconstruction device C21 is shown schematically. This is a so-called third-generation CT system, although the invention is not limited to this CT system. In the gantry housing C6 there is a closed gantry, not shown, on which a first x-ray tube C2 with an opposite detector C3 is arranged. Optionally, in the CT system shown here, a second x-ray tube C4 with an opposite detector C5 is provided, so that a higher temporal resolution can be achieved by additional available emitter / detector combinations, Alternatively, “dual-energy” examinations can also be carried out using different X-energy spectra in the emitter / detector system.

[0027]Furthermore, the CT system C1 has a patient table C8 on which the patient can be pushed along the system axis C9 (also referred to as the z-axis) into the measurement field during the examination, wherein a purely circular scan can also be performed The scan itself is...

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Abstract

A method is disclosed for reconstructing image data of an examination object from measured data, wherein the measured data was captured previously during a relative rotary motion between a radiation source of a computed tomography system and the examination object. In at least one embodiment, the measured data is modified to achieve a particular grayscale characteristic of the image data to be reconstructed. The image data is calculated by way of an iterative algorithm using the modified measured data, wherein no arithmetic step for reducing noise is employed in the iterations.

Description

technical field [0001] The invention relates to a method for reconstructing image data of an examination object from measurement data which were acquired beforehand with a relative rotational movement between a radiation source and the examination object of a computed tomography system. Background technique [0002] The tomographic imaging method is characterized in that it enables examination of the internal structure of the examination object without surgical intervention therein. One possible generation of a tomographic image is to record several projections from different angles of the object to be examined. From these projections, two-dimensional cross-sectional views or three-dimensional volume images of the object under examination can be calculated. [0003] An example of such a tomographic imaging method is computed tomography. Methods of scanning an examination object using a CT system are generally known. For example, circular scans, sequential circular scans w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T11/00
CPCA61B6/4441A61B6/032G06T2211/424A61B6/5205A61B6/4014G06T11/006A61B6/482A61B6/5258A61B6/507
Inventor 赫伯特.布鲁德马丁.彼得希尔卡雷纳.劳佩克卡尔.施瓦兹
Owner SIEMENS AG
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