Method of reconstructing a tomogram of an X-ray apparatus

Details Method of reconstructing a tomogram of an X-ray apparatus Method of reconstructing a tomogram of an X-ray apparatus

2002-01-24

2002-12-31

Kim, Robert H. (Department: 2882)

X-ray or gamma ray systems or devices

Specific application

Tomography

C378S025000

Reexamination Certificate

active

06501823

ABSTRACT:

CROSS REFERENCE TO RELATED APPLICATIONS
This application claims the benefit of Korean Application No. 2001-40219 filed Jul. 6, 2001, in the Korean Patent Office, the disclosure of which is incorporated herein by reference.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates generally to X-ray apparatuses, and more particularly to a method of reconstructing a-tomogram of an X-ray apparatus to obtain a three-dimensional image from X-ray images.
2. Description of the Related Art
FIG. 1
is a schematic diagram showing a photographing operation of a conventional X-ray apparatus.
Referring to
FIG. 1
, while being rotated around a first circular orbit, an X-ray irradiator
10
irradiates X-rays to a subject
30
at positions A, B, C and D on a first circular orbit. At this time, an X-ray detector
20
is rotated in conjunction with the X-ray irradiator
10
around a second circular orbit having the same central axis as the first circular orbit. Accordingly, the X-ray detector
20
detects X-rays which have been transmitted through the subject
30
at positions A
1
, B
1
, C
1
and D
1
on the second circular orbit. Images detected by the X-ray detector
20
at the positions A
1
, B
1
, C
1
and D
1
are illustrated in FIG.
2
.
Thereafter, the conventional X-ray apparatus constructs a target image
40
of a cross section, that is, a desired focal plane
32
, by overlapping a vertical transmission image E and a plurality of slant transmission images obtained by detecting the X-rays which have been transmitted through the subject
30
at positions A
1
, B
1
, C
1
and D
1
.
However, the conventional X-ray apparatus of
FIG. 1
is disadvantageous in that a long period of time is required to obtain a tomogram, and the precision of the apparatus deteriorates because images are obtained while an X-ray irradiator and an X-ray detector are moved in conjunction with each other to obtain the tomogram from these images.
SUMMARY OF THE INVENTION
The present invention has been made in view of the above problem, and it is an object of the present invention to provide a method of reconstructing a tomogram of an X-ray apparatus, which improves precision and reduces a required period of time to obtain a desired tomogram from a subject.
Additional objects and advantages of the invention will be set forth in part in the description which follows, and, in part, will be obvious from the description, or may be learned by practice of the invention.
To accomplish the above and other objects of the invention, the present invention provides a method of reconstructing a tomogram of an X-ray apparatus, obtaining model information of a subject; obtaining a transmission image of the subject; reconstructing a tomogram based on the transmission image and the model information; and displaying the reconstructed tomogram.


REFERENCES:
patent: 6292527 (2001-09-01), Guendel
patent: 6298111 (2001-10-01), Ozaki
patent: 6418186 (2002-07-01), Kawai et al.
patent: 6426987 (2002-07-01), Nakamura et al.

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