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

A technology of CT image and projection data, applied in the field of three-dimensional computed tomography, capable of solving problems such as not being suitable for input

Inactive Publication Date: 2002-11-20
GENERAL ELECTRIC CO
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  • 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 3-D CT image of body by uisng conical beam projection data
  • Method for reproducing 3-D CT image of body by uisng conical beam projection data
  • Method for reproducing 3-D CT image of body by uisng conical beam projection data

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Embodiment Construction

[0068]Referring first to Figure 1, there is a typical scan and acquisition data structure using cone beam geometry coupled to a reproduction apparatus 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...

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Abstract

The present invention discloses a method for transforming X-ray cone beam data (line integration through an object) into Radon data (half integral) 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 intersection of a pair of corresponding integration planes rotated relative to each other by an angle δβ and the normalized detector plane, and then divide the difference between the weighted line integrals by the rotation angle δβ. This method can transform the cone beam data to represent the plane integral value on 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, the application number submitted by Kwok C.Tam is 91111689.3, and the title of invention is the patent application [RD-19564 for "parallel processing method and device for reconstructing three-dimensional CT images of objects by cone beam projection data or by plane integrals" ],as well as [0004] And at the same time, the application number proposed by Kwok C.Tam is 91111690.7, and the title of invention is the patent application of "method and device for reproducing object ...

Claims

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Application Information

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IPC IPC(8): A61B6/03G01T1/161G06T1/00G06T11/00G06T15/08
CPCG06T11/005G06T2211/416G06T2211/421
Inventor 谭国昌
Owner GENERAL ELECTRIC CO
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