X-ray or gamma ray systems or devices – Specific application – Absorption
Reexamination Certificate
1999-12-01
2001-10-23
Bruce, David V. (Department: 2882)
X-ray or gamma ray systems or devices
Specific application
Absorption
C378S008000
Reexamination Certificate
active
06307914
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a moving body pursuit irradiating device of an X-ray, an electron beam, a proton beam, a heavy particle beam, etc. capable of automatically calculating the position of a tumor moving round within a leading body portion in real time irrespective of absolute accuracy of a mechanical system and accurately selectively irradiating a large dose of beam to the tumor and reducing exposure to a normal tissue, and also to a positioning method using this device.
2. Description of the Related Art
A conventional moving body pursuit irradiating device will be explained with reference to the drawings.
FIG. 27
is a view showing the construction of a conventional moving body pursuit irradiating device shown in e.g., Japanese Patent Application Laid-Open No. Hei 1-242074.
In
FIG. 27
, reference numerals
1
,
5
and
6
respectively designate a medical treatment base, a patient and a supporting frame rail. Reference numerals
7
and
8
respectively designate a supporting frame rail and an X-ray TV camera input device. This X-ray TV camera input device
8
is constructed by an X-ray tube
8
a
arranged in the supporting frame rail
6
, and an image intensifier
8
b
arranged in the supporting frame rail
7
. Reference numerals
9
,
10
and
11
respectively designate a digital image processor connected to the image intensifier
8
b
, an electronic computer connected to this digital image processor
9
, and a medical treatment base controller connected to the electronic computer
10
and coupled to the medical treatment base
1
. Each of reference numerals
12
and
13
designates an image display connected to the electronic computer
10
. Reference numeral
14
designates a tablet connected to the electronic computer
10
.
An operation of the above conventional moving body pursuit irradiating device will be next explained with reference to the drawings.
FIG. 28
is a view for explaining the positional relation of the x-ray tube
8
a
of the conventional moving body pursuit irradiating device and a diseased part S of the patient
5
.
FIG. 29
is a view showing an X-ray TV image of the diseased part S.
In
FIG. 28
, a coordinate axis in a long side direction of the medical treatment base
1
is set to an X-axis, and a coordinate axis in a vertical direction is set to a Z-axis. Further, a direction perpendicular to the X-axis and the Z-axis is set to a Y-axis. An origin O is set to be located just below a center of the medical treatment base
1
and is also set to be located on a vertical line passing the X-ray tube
8
a
in an initial position A. When the height between the X-ray tube
8
a
and the medical treatment base
1
is set to H, coordinates in the initial position A are (0, 0, H). An intersecting point of a vertical axis passing a position B and the X-axis just below the medical treatment base
1
is set to Q. The distance between the initial position A of the X-ray tube
8
a
and the initial position B after parallel displacement in the X-axis direction is set to a.
In FIGS.
29
(
a
) and
29
(
b
), values of the diseased part S of the patient
5
in the initial position A of the X-ray tube
8
a
and the position B after the parallel displacement are respectively shown by S
1
and S
2
. Coordinate positions of images S
1
and S
2
of the diseased part S of the patient
5
are expressed at a specific one point (a center of the patient or its peripheral portion) of the diseased part S.
First, an X-ray TV image of the diseased part S of the patient
5
is picked up by the X-ray TV camera input device
8
in the initial position A of the X-ray tube
8
a
. This X-ray TV image is digitized by the digital image processor
9
. Thereafter, an image distortional correction such as bobbin winding distortion, etc. is made and the corrected image is displayed in the image display
12
through the electronic computer
10
.
Subsequently, the X-ray tube
8
a
and the image intensifier
8
b
are simultaneously moved in parallel with each other by the distance a in the X-axis direction on the supporting frame rails
6
,
7
. The X-ray TV image of the diseased part S of the patient
5
is again picked up by the X-ray TV camera input device
8
in the position B after the parallel displacement. This X-ray TV image is then displayed in the image display
13
through the digital image processor
9
and the electronic computer
10
.
Then, an operator displays (points) images S
1
and S
2
of the diseased part S in the image displays
12
and
13
by the tablet
14
.
The electronic computer
10
executes the following arithmetic operations (1) to (4) on the basis of information of the images S
1
and S
2
of the supported diseased part S. In this case, a vector between coordinates a and b is shown by “→a·b”.
(1) The distance
1
on the X-axis between the images S
1
and S
2
of the diseased part S is calculated by the difference between vector→O·S
1
and vector→O·S
2
.
(2) A height h of the diseased part S in the Z-axis direction is calculated by h=1·H/(a+1).
(3) When X and Y coordinate values of the image S
1
of the diseased part S are respectively set to X
1
and Y
1
as shown in FIG.
29
(
a
), X, Y and Z coordinates Sx, Sy and Sz of the diseased part S are calculated from the following formula.
Sx=(1−h/H)·X
1
Sy=(1−h/H)·Y
1
Sz=h
(4) A parallel displacement amount of the medical treatment base
1
is calculated from the difference between a desirable position of the patient
5
and the position (Sx, Sy, Sz) of the diseased part S.
When the above-mentioned arithmetic processings are terminated, the medical treatment base
1
is moved in parallel with horizontal and vertical directions by the medical treatment base controller
11
on the basis of commands of the electronic computer
10
until the desirable position. Thus, the position of the diseased part S of the patient
5
can be aligned with a predetermined three-dimensional coordinate position.
In the conventional moving body pursuit irradiating device mentioned above, when the three-dimensional coordinates are calculated, it is necessary to move the X-ray TV camera input device (an X-ray fluoroscope) every time. A position of the three-dimensional coordinates which is to be calculated must be also manually commanded every time. Further, a problem exists in that the calculation of the three-dimensional coordinates depends on mechanical accuracy of attachment of the X-ray TV camera input device and an absolute position of the patient. Therefore, it was difficult to obtain the three-dimensional coordinates in real time.
SUMMARY OF THE INVENTION
The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to obtain a moving body pursuit irradiating device capable of automatically calculating the position of a tumor moving round within a leading body portion in real time, and securing a substantial required accuracy irrespective of the absolute accuracy of a mechanical system, and obtain a positioning method using this moving body pursuit irradiating device.
Another object of the present invention is to obtain a moving body pursuit irradiating device capable of selectively accurately irradiating a large dose of beam and reducing exposure to a normal tissue, and obtain a positioning method using this moving body pursuit irradiating device.
In this invention, there is provided a moving body pursuit irradiating device comprising: a linac for irradiating a medical treatment beam to a tumor; a tumor marker buried in the vicinity of the tumor; a first X-ray fluoroscope for picking up an image of the tumor marker from a first direction; a second X-ray fluoroscope for picking up the image of the tumor marker from a second direction at the same time as the first X-ray fluoroscope; first and second image input sections for digitizing first and second fluoroscopic images outputted from the first and second X-ray fluoroscopes; first and second recognition processing sec
Kunieda Tatsuya
Shirato Hiroki
Bruce David V.
Mitsubishi Denki & Kabushiki Kaisha
Rothwell Figg Ernst & Manbeck
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