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Method for producing a noise-reduced ct image data record, computer system, and ct system

A technique for CT images, image data, used in the fields of generating noise-reduced CT image data sets, computing systems, and CT systems

Active Publication Date: 2013-04-10
SIEMENS HEALTHCARE GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to create an improved method for generating noise-reduced CT image data sets from a plurality of CT image data sets acquired with different X-ray energy spectra

Method used

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  • Method for producing a noise-reduced ct image data record, computer system, and ct system
  • Method for producing a noise-reduced ct image data record, computer system, and ct system
  • Method for producing a noise-reduced ct image data record, computer system, and ct system

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Embodiment Construction

[0038] figure 1 A dual-source / dual-energy CT system 1 with which the method according to the invention is carried out is shown as an example. The illustrated CT system 1 has a first radiator / detector system with an x-ray tube 2 and an oppositely arranged detector 3 , wherein a first x-ray energy is recorded with the first radiator / detector system 2 , 3 Spectrum R 1 absorption data. In addition, the CT system 1 also has a staggered 90° for utilizing the second X-ray energy spectrum R 2 Simultaneously scanning second radiator / detector system consisting of a second X-ray tube 4 and a second detector 5 arranged opposite. Both radiator / detector systems are located on a gantry which is arranged in a gantry housing 6 and rotates about a system axis 9 during scanning.

[0039] The patient 7 to be scanned is located on a movable examination table 8 which is moved along the system axis 9 through the scanning field located in the gantry housing 6, where the attenuation of the x-ray r...

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Abstract

A method is disclosed for producing a noise-reduced CT image data record by frequency band breakdown, a computer system for carrying out the method, and a CT system (1) with such a computer system. In an embodiment of the method, several linear-combined mixed image data records are produced from several simultaneously-recorded energy spectrum-specific CT image data records (Xi); a frequency band breakdown of the mixed image data records (Mm) takes place into a first lowest frequency band (F0) and several higher frequency bands; and a result image data record is calculated, wherein each mixed image data record (Mm) is multiplied with precisely one filter and with a location-dependent function (gj,m(r)) and is thereby totaled, and wherein g0,0(r)=1.

Description

technical field [0001] The invention relates to a method for generating a noise-reduced CT image dataset by band decomposition, a computing system for carrying out the method, and a CT system with such a computing system. Background technique [0002] It is generally known that CT image data sets of an object can be recorded simultaneously with different x-ray spectra by means of a multi-energy CT system. Usually an attempt is made to calculate a single image with the desired information from these CT image datasets, for example a CT image which corresponds to a monoenergy spectrum or which only shows the distribution of the contrast agent in the scanned object. For this purpose a linearly blended blended image can be produced where X i Indicates that for the CT image data set of the i-th X-ray spectrum, the selection coefficient c i，m to get a specific image look and feel, and set m=0. But the noise in this linear combination can be greatly increased compared to the no...

Claims

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Application Information

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IPC IPC(8): A61B6/03
CPCA61B6/541A61B6/482A61B6/032A61B6/03A61B6/4014
Inventor T.弗洛尔B.克劳斯R.劳帕克B.施密特
Owner SIEMENS HEALTHCARE GMBH