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Reconstruction of image data by means of contour data

A technology of contour data and image data, applied in the field of imaging system

Active Publication Date: 2015-04-29
SIEMENS HEATHCARE GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to improve the reconstruction of image data from incomplete projection data

Method used

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  • Reconstruction of image data by means of contour data
  • Reconstruction of image data by means of contour data
  • Reconstruction of image data by means of contour data

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Experimental program
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Embodiment Construction

[0025] exist figure 1 A first imaging system with a CT system is firstly shown schematically in . These are so-called third-generation CT systems, but the invention is not limited thereto. In the gantry housing C6 there is a closed gantry, not visible here, on which a first x-ray source C2 in the form of an x-ray tube and an x-ray detector C3 arranged opposite it are arranged. Optionally, a second x-ray tube C4 and an oppositely arranged x-ray detector C5 are arranged in the CT system C1 shown here, so that a higher temporal resolution can be achieved by an additionally provided radiator / detector combination , or where different X-ray energy spectra are used in the emitter / detector system, so-called "dual-energy" inspections can also be performed.

[0026]Furthermore, the CT system C1 has a patient table C8 on which the patient can be moved during an examination along a system axis C9 , also referred to as the z-axis, into the scanning field or measurement field FOV (acronym...

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Abstract

A method is based on first projection data, recorded during a relative rotational movement between an x-ray source of a CT device and at least one examination object lying partly outside the field of view of the CT device. Contour data of the surface of the examination object is useable to enhance the reconstruction of the incomplete first projection data. The spatial correlation between the first projection data and the contour data is known. The first projection data is expanded by way of the contour data to modified projection data, so that the modified projection data includes information about the contour of the examination object lying outside the field of view of the CT device. In an embodiment of the inventive reconstruction of image data by way of the modified projection data, fewer or no artifacts occur by comparison with reconstruction of image data from just the first image data.

Description

technical field [0001] The invention relates to a method and an imaging system for reconstructing image data from contour data. Background technique [0002] Computed tomography (CT) is known as a two-stage imaging method. Projection data are acquired here by examining the object with x-ray transmission and acquiring the attenuation of the x-rays along their path from the x-ray source to the x-ray detector. The attenuation is caused by the transmitted material along the ray path, so attenuation can also be understood as the line integral of the attenuation coefficients of all volume elements (voxels) along the ray path. The acquired projection data cannot be interpreted directly, ie they do not produce images of the transmitted layers of the examination object. In a second step, the attenuation coefficients of the individual voxels can be back-calculated from the projection data by reconstruction methods and an image of the distribution of the attenuation coefficients can ...

Claims

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Application Information

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IPC IPC(8): A61B6/03
CPCA61B6/4441A61B6/5211A61B6/5258G06T11/006G06T2211/432G06T2211/436A61B6/032A61B6/5205G16H50/20G06T5/20G06T5/50
Inventor T.弗洛尔B.施密特M.塞德尔迈尔
Owner SIEMENS HEATHCARE GMBH