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Acquisition and reconstruction of projection data using a stationary ct geometry

A ray and data technology, applied in the field of source and detector structure, which can solve problems such as incomplete projection data mathematics

Active Publication Date: 2009-08-19
GENERAL ELECTRIC CO
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

As a result, the acquired projection data is mathematically incomplete

Method used

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  • Acquisition and reconstruction of projection data using a stationary ct geometry
  • Acquisition and reconstruction of projection data using a stationary ct geometry
  • Acquisition and reconstruction of projection data using a stationary ct geometry

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[0030] now refer to figure 1 , the CT system is generally illustrated and represented by reference numeral 10 . CT system 10 includes a scanner 12 formed as a cylindrical gantry and containing one or more stationary X-ray distribution sources 14 and one or more stationary digital detector arrays 16, as described in more detail below. The scanner 12 is configured to receive a support member 18 that passes through the imaging volume and on which is placed an object to be scanned. The support member 18 can be moved through an aperture in the scanner 12 to properly position the object or objects in the imaging space scanned during an imaging sequence. In one embodiment, the support member 18 is a conveyor belt configured such that objects undergoing imaging pass through the scanner 12 continuously or nearly continuously. In other embodiments, support member 18 is a table or support configured to move an object or patient into scanner 12 .

[0031]The system also includes a radi...

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Abstract

Systems and methods are provided for acquiring and reconstructing projection data that is mathematically complete or sufficient acquired using a computed tomography (CT) system. In one embodiment, a distributed source is provided as arcuate segments offset in the X-Y plane and along the Z-axis. In another embodiment, a set of projection data representative of a sampled portion of a cylindrical surface is provided. The set of projection data is reconstructed using a suitable cone-beam reconstruction algorithm. In another embodiment, two or more sets of spatially interleaved helical projection data are processed using helical interpolation. The helically interpolated set of projection data is reconstructed using a two-dimensional axial reconstruction algorithm or a three-dimensional reconstruction algorithm.

Description

[0001] Cross References to Related Applications [0002] This application claims priority to U.S. Provisional Patent Application No. 60 / 841,010, entitled "Acquisition and Reconstruction of Projection Data Using Stationary CT Geometry," filed August 30, 2006, which is hereby incorporated by reference in its entirety. incorporated. technical field [0003] The present invention relates generally to imaging systems for computed tomography (CT), and more particularly to source and detector configurations for stationary CT systems to facilitate measurement of more mathematically complete projection data for image reconstruction. Background technique [0004] CT projection datasets contain projection measurement data from numerous angular positions or viewing angles of the x-ray tube and detector relative to the imaged patient or object. A mathematically complete set of projection data includes measurement data sufficient to reproduce the imaging volume without artifacts within t...

Claims

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Application Information

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IPC IPC(8): G01T1/29
Inventor 杰德·D·帕克尹杰萨米特·K·巴苏约翰·C·希尔彼得·M·伊迪克
Owner GENERAL ELECTRIC CO
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