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Improved multi-segment image reconstruction for cardiac computed tomography acquisitions

A technology of tomography and image reconstruction, which is applied in the fields of instruments, computing, and image enhancement for radiological diagnosis, and can solve problems such as image motion blur and displacement

Active Publication Date: 2015-10-28
SIEMENS HEALTHCARE GMBH
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0004] A disadvantage of this generally known calculation method is that, when the examination object is in motion, or at least partially in motion, motion blur occurs in the image, because during the time of the scanning process for the data required for an image, Displacement of the inspection object or part of the inspection object may occur, so that the underlying data forming the image does not reflect the same state in all spaces of the inspection object

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  • Improved multi-segment image reconstruction for cardiac computed tomography acquisitions
  • Improved multi-segment image reconstruction for cardiac computed tomography acquisitions
  • Improved multi-segment image reconstruction for cardiac computed tomography acquisitions

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Embodiment Construction

[0029] 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.

[0030]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 for reconstructing picture data of a cyclically-moving object from measurement data is disclosed, with the measurement data being detected beforehand for a relative rotational movement between a radiation source of a computed tomography system and the object under examination during a plurality of movement cycles of the object under examination. In at least one embodiment, a first picture and a second picture are determined from the measurement data, with measurement data of different movement cycles being combined for reconstruction of the second picture into a measurement dataset to be used as the basis for the picture reconstruction. Difference information is computed by comparing the first picture with the second picture. Using the difference information, a result picture is computed from the first picture and the second picture.

Description

technical field [0001] The invention relates to a method for reconstructing image data of a periodically moving examination object from measurement data, wherein a relative rotation between a radiation source of a computed tomography system and the examination object is performed beforehand during a plurality of motion cycles of the examination object Collect measurement data while in motion. Background technique [0002] Methods of scanning an examination object using a CT system are generally known. In this case, for example, circular scanning, sequential circular scanning with advance or helical scanning is used. Other kinds of scans that are not based on circular motion are also possible, eg scans with linear segments. Absorption data of the examination object are recorded from different recording angles by means of at least one x-ray source and at least one opposed detector, and the absorption data or projections thus collected are calculated as cross-sectional images...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A61B6/03G06T11/00A61B5/352
CPCA61B6/503A61B6/507A61B6/5264G06T5/003G06T5/50G06T11/005G06T2207/10081G06T2207/30004G06T2211/412G06T5/73
Inventor 托马斯·阿尔曼丁格伯恩哈德·施米特
Owner SIEMENS HEALTHCARE GMBH
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