JPH11258718A - X-ray ct image measurement device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily measure the fluoroscopic radiograph and the optional tomograph of an object to be measured. SOLUTION: This measurement device is equipped with an X-ray radiation source 2 radiating X-rays by a fan-shape surface (n) opened toward both sides from an irradiation center line CL by a small angle, a fitting table for an object to be measured 6 provided with a movable means 5 having a fitting part 4 to which the object to be measured 3 irradiated with the X-rays when the surface (n) is crossed is fitted and changing the position of the fitting part 4 and an X-ray detection means 7 detecting the X-rays passed through the object 3 and arithmetically operating a CT image by the detection of the X-rays. The fitting table 6 is provided with a slant tool 11 turning the object 3 toward the inside of a radius and turning the fitting part 4 toward the outside of the radius around the irradiation center line of the X-rays.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an X-ray CT capable of easily measuring a perspective view or an arbitrary tomogram of an object to be measured.
The present invention relates to an image measurement device.

[0002]

2. Description of the Related Art In order to measure a perspective view and a tomogram of an arbitrary cross section of an object to be measured (hereinafter referred to as a "CT image" including these), an X-ray is required. A CT image measuring device is used. This type of measuring device is used not only for diagnosing various diseases of the human body but also for inspecting and analyzing the internal structure of industrial products. For example, a measuring device having a complicated shape such as a club head of a golf club is used. Regarding the measurement object, the method for fixing the measurement object has not been established, and the measurement has been difficult.

For example, in the case of the club head, it is conceivable to fix the neck portion extending from the head and connected to the shaft by inserting the neck portion into a hole provided in the measuring table or by inserting it into a projection. According to this method, a CT image can be obtained only for a certain surface. Further, since the lie angles of the club heads are often different from each other, it has been difficult to obtain a CT image in a cross section parallel to the sole surface for each club.

The present invention has been devised in view of such a problem, and has been developed in consideration of an object to be measured even if the object to be measured has a complicated shape.
It is an object of the present invention to provide an X-ray CT image measuring device capable of easily measuring a T image.

[0005]

According to a first aspect of the present invention, there is provided an X-ray radiation source capable of emitting X-rays on a fan-like surface which opens a small angle to both sides from an irradiation center line, and wherein the fan-like surface comprises: An object mounting base having a mounting portion for mounting an object to be irradiated with X-rays by traversing and having movable means for changing the position of the mounting portion, and detecting X-rays passing through the object to be measured. And X-ray detecting means for calculating a CT image by the detection thereof, and the workpiece mounting base is provided around the irradiation center line and radially inside the workpiece and radially outside the mounting part. An X-ray CT image measuring apparatus, comprising: a tilting tool for rotating the X-ray CT apparatus.

According to a second aspect of the present invention, there is provided the X-ray CT image measuring apparatus according to the first aspect, wherein the tilting tool rotates the mounting portion by 180 degrees or more.

According to a third aspect of the present invention, the object mounting base includes a horizontal movement adjusting tool for moving a mounting portion horizontally in a direction perpendicular to the irradiation center line, and a direction perpendicular to the irradiation center line. 3. An X-ray CT according to claim 1, further comprising: a vertical adjuster for moving the mounting portion up and down by using
It is an image measuring device.

According to a fourth aspect of the present invention, the fan-shaped surface of the X-rays is arranged horizontally, and the workpiece mounting base rotates the mounting portion about a vertical axis and stops at at least three positions. 4. The X-ray CT image measuring apparatus according to any one of claims 1 to 3, further comprising a CT image forming / rotating means.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. X-ray CT image measuring apparatus 1 of the present embodiment
As shown in FIG. 1, an X-ray radiation source 2 that can radiate X-rays on a fan-shaped surface n that opens a small angle to both sides from the irradiation center line CL, and the fan-shaped surface n crosses (shown by hatching) An X-ray passing through the DUT 3 and a DUT mounting table 6 having a mounting portion 4 for mounting the DUT 3 to be irradiated with X-rays and having movable means 5 for changing the position of the mounting portion 4. X for detecting and calculating a CT image by the detection
And line detecting means 7. In this example, the measured object 3 is something other than a human body, for example, a club head H of a golf club, and in FIG.
It is illustrated that it is attached to.

As shown in FIGS. 1 and 2, the X-ray radiation source 2 includes a high voltage generator 2a capable of generating a high voltage in this embodiment,
The X-ray tube 2b is loaded with the high voltage. The X-ray tube 2b can generate continuous X-rays by colliding an electron beam emitted from a cathode with a target. In order to obtain an image with high accuracy, it is preferable to make the electron beam as fine as possible and make the electron beam travel at the same speed to collide with a fine target. In the present embodiment, X
FIG. 2 illustrates an example in which fan-shaped surfaces n from which lines are radiated are arranged horizontally.

The X-ray detecting means 7 for detecting X-rays passing through the club head H is a so-called composite detector of a video intensifying tube 7a and a linear (image) sensor 7b in this embodiment. I have.

In the present embodiment, the workpiece mounting table 6 is a Y-axis horizontal movement adjusting tool for moving the mounting section 4 in the Y-axis direction, which is a direction perpendicular to and horizontal to the irradiation center line CL, as the movable means 5. 8 and X that is parallel to the irradiation center line CL.
X-axis horizontal movement adjuster 9 for moving mounting portion 4 in the axial direction
And a vertical adjuster 10 for moving the mounting portion 4 in the Z-axis direction which is perpendicular to the irradiation center line CL and vertically, and the club head H is radially inward in the θ direction around the irradiation center line CL. Tilting tool 1 for rotating the dial 4 toward the outside of the radius
1 and a CT image forming and rotating means 12 for rotating and stopping the mounting portion 4 in the φ direction around the vertical axis.

In the present embodiment, the Y-axis horizontal movement adjusting tool 8 includes a rail portion 8a provided on a base Tb which is immovable in the horizontal direction, and a rail portion 8a extending in the Y direction. And a first movable table T1 having a receiving portion 8b. The first moving table T1 can be moved in the Y direction (left and right) along the rail 8a by a driving means such as a step motor (not shown) and can be stopped accurately at a predetermined position.

The X-axis horizontal movement adjusting tool 9 is provided on a rail 9 along the X direction, which is provided on the upper surface of the first movable table T1.
a and a second moving table T2 having a rail receiving portion 9b that moves back and forth along the rail portion 9a. The second moving table T2 can be moved in the X direction (front and rear) with respect to the first moving table T1 by a driving unit (not shown), and thereby the imaging magnification of the measured section 3 can be changed.

In the present embodiment, the base Tb can be moved up and down in the Z-axis direction, which is the vertical direction, by the up-and-down adjusting tool 10 comprising hydraulic cylinders for lifting and lowering attached to four corners of the base Tb.

In this embodiment, the mounting portion 4 is mounted on the third movable base T3 via the tilting tool 11, and the third movable base T3 is connected to the third movable base T3. CT that rotates and stops in the φ direction around the vertical axis
It is provided on the second movable table T2 via the image forming / rotating means 12.

As shown in FIGS. 1 and 3, the mounting portion 4 has a substantially box shape in this embodiment, and holds the club head H by inserting the neck portion Hn of the club head H into the upper surface. An example in which a hole 4a is formed is illustrated. Preferably, a rubber sleeve or the like is inserted into the hole 4a, and the neck H
Preferably, n is maintained.

As shown in FIG. 4, a convex portion capable of holding the club head H by being inserted into a shaft mounting hole Hs formed in the neck portion Hn of the club head H instead of the hole 4a. 4b can also be provided.

As shown in FIGS. 1 and 3, in the present embodiment, the tilting tool 11 has a ring rail R having a substantially ring shape and a tooth surface G formed on an inner peripheral surface, and a ring rail R of the ring rail R. A pair of pinions 13a, 13 meshing with the tooth surface G
b, an idle roller 14 that rolls on the outer peripheral surface of the ring rail R, and a motor M that drives the pinion 13a.
And the pinions 13a and 13b and the motor M
FIG. 3 illustrates an example that is housed and arranged inside the mounting portion 4 as shown in FIG.

Therefore, the tilting tool 11 is connected to the motor M
Is driven by a predetermined amount, the mounting portion 4 can be guided and moved by the ring rail R. By the movement of the mounting portion 4 along the ring rail R, the DUT 3 held by the mounting portion 4 can be tilted radially inward and the mounting portion 4 can be tilted radially outward. Desirably, it is preferable that the mounting portion 4 be tilted by about 180 degrees or more, and that the ring rail R be made of, for example, a transparent acrylic resin that easily transmits X-rays.

The CT image forming and rotating means 12 comprises, for example, a geared motor having a built-in speed reducer, and rotates the third moving table T3 about the vertical axis with respect to the second moving table T2. be able to.

The movable means 5, the X-ray radiation source 2, the X-ray detecting means 7 and the like are managed by an arithmetic and control unit 16 as shown in FIG. The operation of the X-ray CT image measuring apparatus 1 according to the present embodiment will be described.

As shown in FIG. 1, the club head H, which is the object 3 to be measured, has its neck portion Hn connected to the hole 4a of the mounting portion 4.
Is fixed to the mounting portion 4. Then, an arbitrary cross section of the club head 3 is aligned with the fan-shaped surface n formed by the X-rays.

For this alignment, the mounting portion 4 can be repositioned in the X, Y or Z-axis directions by using the various movable means 5 and the mounting portion 4 for holding the club head H.
As a result, the club head H can be tilted radially inward and the mounting portion 4 can be tilted radially outward, so that the mounting portion 4 is moved along the ring rail R in accordance with the lie angle α of the club head H. As shown in FIG. 5, it is possible to make the sole surface S of the club head H substantially horizontal and align it along the fan-shaped surface formed by the X-rays.

Further, for example, by utilizing the movement of the object mounting base 6 in the Z direction, arbitrary cross sections H1, H2,... Substantially parallel to the sole surface S of the club head H can be easily formed on the X-ray fan-shaped surface n. Can be aligned.

When X-rays are emitted in such a state, the X-rays passing through the club head H are partially absorbed by the club head H, pass through the club head H, and are detected by the X-ray detecting means 7. You. This detection signal is visualized by a predetermined image processing device or signal processing device,
T, output to a storage medium as printer or machine readable information. Further, by confirming such information, an arbitrary cross section substantially parallel to the sole surface S of the club head H can be easily measured, and the internal structure can be inspected and analyzed.

Further, in this embodiment, as shown in FIG. 6 when the measuring state is viewed from above, the sole surface S is attached by the CT image forming / rotating means 12, which is one of the movable means 5, while keeping the sole surface S substantially horizontal. Since the portion 4 can be rotated and stopped in the φ direction by an angle φ1 (120 ° in this example), X-rays are irradiated from at least three directions on any cross section parallel to the sole surface S of the club head H. Thus, a perspective view can be measured, and a tomogram of the cross section can be easily obtained from such information by using a restoration method such as a back projection method.
At this time, it is desirable that the ring rail R does not overlap with the club head on the fan-shaped surface formed by the X-rays.

In this embodiment, the tilting tool 11 is used to change the face surface F of the club head H as shown in FIG.
Of any cross section A1, A2,...
An image can be easily obtained.

As described above, in the X-ray CT image measuring apparatus according to the present embodiment, the club head H is mounted on the mounting section 4 and tilted even when the object 3 has a complicated shape like a club head. Thus, the sole surface can always be arranged along the horizontal plane, and a tomogram in such a cross section can be easily measured.

FIG. 8 shows another embodiment of the present invention. In this embodiment, the tilting tool 11 includes a frame 20 having an opening 19, a ring gear 23 rotatably supported by pinions 21, 21 and a drive pinion 22 attached to the frame 20, and an inner periphery of the ring gear 23. And a mounting portion 4 for mounting the DUT 3 toward the opening 19 provided on the surface. Also in this example, when the drive pinion 22 is rotationally driven, the DUT 3
Can be tilted inside the radius and the mounting portion 4 is outside the radius.

[0031]

As described above, according to the first aspect of the present invention, since the object to be measured can be tilted around the irradiation center line, the object to be measured having a complicated shape such as a club head can be used. It is possible to measure an arbitrary CT image by appropriately changing the irradiation position of the X-ray even in the case of the present invention. It is possible to obtain CT images at all the positions.

According to a third aspect of the present invention, there is provided the apparatus according to the third aspect of the present invention, wherein the object mounting base includes a horizontal movement adjusting tool for moving the mounting portion horizontally in a direction perpendicular to the irradiation center line, and a direction perpendicular to the irradiation center line. By providing a vertical adjuster for moving the mounting portion up and down with the above, the object to be measured can be accurately positioned with respect to the X-ray irradiation center line, and the measurement accuracy can be improved.

According to a fourth aspect of the present invention, the fan-shaped surface of the X-ray is arranged horizontally, and the workpiece mounting base rotates the mounting portion about a vertical axis and stops at at least three positions. With the provision of the CT image forming and rotating means, CT images can be obtained in all the sections of the object including the irradiation center line of the object.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view of an apparatus showing an embodiment.

FIG. 2 is a block diagram illustrating a system configuration of the present invention.

FIG. 3 is a perspective view showing an example of a tilting tool.

FIG. 4 is a perspective view showing another example of a mounting portion.

FIG. 5 is a diagram illustrating an imaging state of a club head as viewed from an X-ray radiation source.

FIG. 6 is a top view showing the imaging state of the club head.

FIG. 7 is a diagram illustrating an imaging state of the club head as viewed from an X-ray radiation source.

FIG. 8 is a perspective view showing another example of the tilting tool.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 X-ray CT image measuring device 2 X-ray radiation source 3 Object to be measured 4 Mounting part 5 Movable means 6 Object to be measured 7 X-ray detecting means 8, 9 Horizontal movement adjusting tool 10 Vertical adjustment tool 11 Tilt tool 12 CT image Forming rotation means CL Irradiation center line n Fan-shaped surface

Claims (4)

[Claims] 1. An X-ray radiation source capable of emitting X-rays in a fan-shaped surface having a small angle on both sides from an irradiation center line, and a mounting portion for mounting an object to be measured to be irradiated with X-rays when the fan-shaped surface traverses. And an X-ray detecting means for detecting an X-ray passing through the object and calculating a CT image based on the detection of the X-ray passing through the object. X is characterized in that the object mounting base is provided with a tilting tool for rotating the object to be measured radially inward around the irradiation center line and radially outward with respect to the object to be measured. Line C
T image measuring device. 2. The X-ray CT according to claim 1, wherein said tilting tool rotates said mounting portion by 180 degrees or more.
Image measuring device. 3. The object mounting base includes a horizontal movement adjuster for moving a mounting portion horizontally in a direction perpendicular to the irradiation center line, and moving the mounting portion up and down in a direction perpendicular to the irradiation center line. The X-ray CT image measuring apparatus according to claim 1, further comprising a vertical adjuster for adjusting the X-ray CT image. 4. The apparatus according to claim 1, wherein said sector surface of said X-rays is arranged horizontally, and said object mounting base includes a CT image forming and rotating means for rotating said mounting part around a vertical axis and stopping at at least three positions. 4. The X-ray CT image measuring apparatus according to any one of 1 to 3, further comprising: