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Imaging system for imaging an object

一种成像系统、对象的技术，应用在成像系统领域

Inactive Publication Date: 2009-09-09
KONINK PHILIPS ELECTRONICS NV
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  • Abstract
  • Description
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Problems solved by technology

[0003] In the article "Efficient correction for CT image artefacts caused by objects extending outside the scan field of view" by B. Ohnesorge, T. Flohr, K. Schwarz, J.P. Heiken, and K.T. Bae (Med. Phys. 27(1), 39-46 (2000)), it is also proposed to backproject the truncated projection using suitable backprojection filters, but these suitable backprojection filters must also generate artifacts in the reconstructed image

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  • Imaging system for imaging an object

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[0033] figure 1The imaging system shown is a computed tomography system (CT system). The CT system comprises a gantry 1 which is rotatable about a rotation axis R extending parallel to the z-axis direction. A polychromatic radiation source 2 is mounted on the frame 1, said polychromatic radiation source 2 being an X-ray tube emitting polychromatic X-ray radiation in this embodiment. Arranged on the X-ray source 2 is a collimator device 3 which in this embodiment forms a conical radiation beam 4 from the radiation generated by the X-ray tube 2 . The radiation passes through an object (not shown) in a region of interest, such as a vessel of a patient or human heart, in an examination zone 5, which in this embodiment is cylindrical. After passing through the examination zone 5, the X-ray beam 4 is incident on an energy-resolving radiation detector, which in this embodiment is an energy-resolving X-ray beam of a two-dimensional detector mounted on the gantry 1 Detector unit6. ...

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Abstract

The present invention relates to an imaging system for imaging an object (20) comprising a polychromatic radiation source (2) and an energy resolving radiation detector (6). The imaging system comprises further a driving device for moving the object (20) and the radiation source (2) relatively to each other, in order to acquire truncated projections from different directions. A calculation unit determines a k-edge component at least of one of the object (20) and a substance within the object (20) from the truncated projections and determines non-truncated projections from the determined k-edge component. A reconstruction unit constructs the object using the non-truncated projections.

Description

technical field [0001] The present invention relates to an imaging system, an imaging method and a computer program for imaging an object. The invention also relates to a corresponding image generating device, an image generating method and a computer program for generating an image of an object. Background technique [0002] There are known imaging systems which acquire truncated projections of an object and reconstruct images by using these truncated projections. This results in image artifacts. These known imaging systems use interpolation techniques to generate non-acquisition missing data and perform truncated projections to obtain non-truncated projections. These calculated non-truncated projections are only approximations, and therefore images reconstructed using these calculated non-truncated projections include artifacts. [0003] In the article "Efficient correction for CT image artefacts caused by objects extending outside the scan field of view" by B. Ohnesorg...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01T1/29
CPCY10S378/901A61B6/482G01T1/2985A61B6/4241
Inventor R·普罗克绍
Owner KONINK PHILIPS ELECTRONICS NV
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