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Method for reproducing 3D CT image of body by using conical beam projection data

A technology for CT images and projection data, which is applied in the field of three-dimensional computer X-ray tomography and can solve problems such as being unsuitable for input

Inactive Publication Date: 2006-05-03
GENERAL ELECTRIC CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore they are not suitable as input for the inverse Radon transform

Method used

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  • Method for reproducing 3D CT image of body by using conical beam projection data
  • Method for reproducing 3D CT image of body by using conical beam projection data
  • Method for reproducing 3D CT image of body by using conical beam projection data

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Embodiment Construction

[0068] see first figure 1, which is a typical scan and acquire data structure using cone beam geometry, is coupled to a reproduction device embodying the invention. The object 20 is located in the field of view between the cone-beam X-ray point radiation source 22 and the two-dimensional detector array 24, which can provide cone-beam projection data. The axis of rotation 26 then passes through the field of view and the object 20 . A mid-plane 28 may be defined as a plane containing the X-ray point source 22 and perpendicular to the axis of rotation 26 . Conventionally, the axis of rotation 26 is referred to as the Z axis, and the intersection of the axis of rotation 26 and the mid-plane 28 is taken as the coordinate origin. As shown, the X and Y axes lie within the midplane 28 . To position S from a variety of X-ray sources i To scan the object 20, the X-ray source 22 should move relative to the object 20 and the field of view along the appropriate scanning track 30, while...

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Abstract

The invention discloses a method for transforming X-ray cone beam data (line integration through an object) into Radon data (half-division integration) for reconstructing three-dimensional CT images through inverse Radon transformation. The radial derivatives of the plane integrals are found by integrating along each of a pair of straight lines on the normalized detector plane, defined as sharing a common axis of rotation and The line of intersection of a pair of corresponding integration planes rotated relative to each other by an angle δβ and the normalized detector plane, and the difference between the weighted line integrals is divided by the rotation angle δβ. This method transforms cone beam data to represent the value of the plane integral over any set of planes in Radon space, such as a set of coaxial vertical planes.

Description

[0001] This application is a divisional application of the Chinese patent application 91111691.5 filed on December 20, 1991, entitled "Method and Device for Reproducing Three-Dimensional CT Images of Objects from Cone Beam Projection Data". [0002] The present invention disclosed and claimed herein relates to the subject matter of the following commonly designated patent applications, and thus all disclosures of these patent applications are hereby incorporated by reference: [0003] And at the same time filed by Kwok C.Tam the application number is 91111689.3 , the patent application [RD-19564] titled "Parallel Processing Method and Device for Reconstructing Three-dimensional CT Image of Objects from Cone Beam Projection Data or Plane Integral", and [0004] And at the same time the application number filed by Kwok C.Tam is 91111690.7 , the patent application titled "Method and Device for Reconstructing Three-dimensional CT Images of Objects from Incomplete Cone Beam Projecti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N23/00G06T17/00A61B6/03G01T1/161G06T1/00G06T11/00G06T15/08
CPCG06T11/005G06T2211/416G06T2211/421
Inventor 谭国昌
Owner GENERAL ELECTRIC CO
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