Method and apparatus using a virtual detector for...

Details Method and apparatus using a virtual detector for... Method and apparatus using a virtual detector for...

1999-06-30

2001-05-22

Bruce, David V. (Department: 2882)

X-ray or gamma ray systems or devices

Specific application

Computerized tomography

C378S019000, C378S901000

Reexamination Certificate

active

06236704

ABSTRACT:

BACKGROUND OF THE INVENTION
In a C-arm X-ray system, as shown schematically in
FIG. 1
, an X-ray source
10
projects energy through an object of interest
20
, rotating about the object and creating a series of two-dimensional images on a detector
30
. To reconstruct a three-dimensional model of an object
20
as detected by the X-ray source
10
, the images are “back projected” (i.e., projected back) from the detector
30
into the three-dimensional space divided into voxels where the object
20
was located, at corresponding angles of rotation. In an idealized system, the detector
30
is fixed in space relative to the source
10
and therefore the only factors of interest are the angle of rotation and possible translational motion of the X-ray source
10
.
In a practical implementation of the C-arm, the arm flexes as it rotates, is changing the relative position and orientation between the source and detector, as well as their position and orientation in space relative to the object of interest. To accurately reconstruct the images into a useful virtual three-dimensional model, compensation for such motion is required.


REFERENCES:
patent: 5559335 (1996-09-01), Zeng et al.

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