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Method and tomography apparatus for reproducing a tomographic image of an object

A technique of tomography, object, applied in the direction of image enhancement, image generation, image data processing, etc.

Inactive Publication Date: 2012-02-01
SIEMENS AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The method is therefore limited to a small number of simple acquisition geometries and tomographic image synthesis

Method used

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  • Method and tomography apparatus for reproducing a tomographic image of an object
  • Method and tomography apparatus for reproducing a tomographic image of an object
  • Method and tomography apparatus for reproducing a tomographic image of an object

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Embodiment Construction

[0033] figure 1 A typical known CT setup is shown with an x-ray source 11 at a first position, which emits an x-ray beam for a first projection which penetrates an object to be examined in a re-site 14, The patient 18 is then detected by the detector 13 at this first position. The data from the detectors are transferred to the analysis computer 15 for reproduction and then displayed on the display unit 16 . The x-ray source 11 moves ideally on a circular path, wherein a large number of projections are recorded from different angles. exist figure 1 Also shown is an X-ray source 11' at another angular position, where an X-ray beam 12' is emitted for another projection, which is then detected by a detector 13' at another position .

[0034] The standard reconstruction method for this CT setup is filtered back projection (FBP). In most cases the rays are also sorted (reshaped) before calculation, giving a set of projections taken with parallel rays at equally spaced projectio...

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Abstract

The invention relates to a method for reconstructing a tomographic image of an object (18) from projection data of a moving radiation source (11) passing through the object (18) onto a detector (13), wherein during the reconstruction filtering and back-projecting the projection data, passing the test under the condition that the radiation source (11), the detector (13) and the test object (58) at the position of the object to be scanned (18) have at least one same spatial layout The projection and iterative analysis reconstruction technique determines a filter that gives the tomographic image an optimal filtering and backprojection of the projection data of the test object at the given layout where the scan is located The object (18) at the position and obtain projection data, using the projection data and the filter determined according to step 1.1 to reconstruct the tomographic image. Furthermore, the invention relates to a tomography device for carrying out the method.

Description

technical field [0001] The invention relates to a method for reconstructing a tomographic image of an object from projection data falling on a detector from a moving radiation source, the projection data being filtered and back-projected during the reconstruction. Furthermore, the invention relates to a tomography system for acquiring projections using different radiations. Background technique [0002] Computed tomography (CT) provides medical and inspection technology with an inspection and measurement method by which the internal structures of a patient or subject can be examined without intervening in the patient or damaging the subject in the process. In this case, several projections are recorded from different angles of the object to be examined, from which projections a three-dimensional description of the object can be calculated. [0003] It is generally known to solve this problem by means of the so-called Filtered Back Projection (FBP), see for example the follo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A61B5/00A61B6/03A61B8/00G06T5/10A61B5/055
CPCG06T2211/421A61B6/032G06T2211/424G01N23/046G06T11/005G01N2223/419G01N2223/612A61B6/583
Inventor 马丁·霍海塞尔沃尔夫冈·黑尔霍尔格·孔泽卡尔·斯蒂尔斯托弗
Owner SIEMENS AG