JPH0767846A - Biomagnetism measuring instrument - Google Patents

Abstract

PURPOSE:To make it possible to move a magnetic detector along the shape around the head with high accuracy by installing a detector mounting frame which is moved in x to z directions and is turnable in two directions and providing this frame with the magnetic detector via a lifting frame. CONSTITUTION:The frame body 2 is provided with a guide rail 6 movable in the y direction and a supporting frame 9a movable in the x direction by traveling rollers 8 is mounted at this guide rail 6 when the directions orthogonal with each other on a two-dimensional plane are defined as x, y, the direction orthogonal with the two-dimensional plane as z and the rotating direction of the x-z plane as 5. This supporting frame 9a is provided with a supporting base 9c movable in the z direction via a rod 9. The detector mounting frame 15 disposed turnably in the alpha, theta directions on this supporting base 9c is provided with a lifting frame 20 movably in the z direction via a strut 19. The magnetic detector 22 contg. a SQUID is mounted on this lifting frame 20 and the biomagnetism of the head, etc., of the testee on a measuring bed 3 is measured.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to SQUID (Supercon
ducting Quatum Interference Device: a biomagnetism measuring device for measuring minute magnetism generated from a living body such as a brain, heart, or lung using a superconducting quantum interference device.

[0002]

2. Description of the Related Art SQU
The ID is known as an ultra-sensitive magnetic detector capable of measuring minute magnetism, and currently in the medical field,
Development of an apparatus for three-dimensionally measuring minute magnetism generated from a deep part of a living body such as heart, lung, and brain using SQUID is in progress.

By the way, when measuring the magnetism of the heart and lungs of a living body, the SQUID may be moved along a substantially flat plane of the body, but when measuring the magnetism of the brain, the SQUID may be moved.
It is necessary to move the ID three-dimensionally along the shape around the head, and the time resolution is about 1 msec level,
It is necessary to move with a high accuracy of about 5 mm in terms of spatial resolution. In addition, the shape of the head varies depending on the person to be measured, and requires a delicate movement corresponding to this.

An object of the present invention is to solve the above problems, and an object thereof is to provide a biomagnetism measuring device capable of moving a magnetic detector with high precision along the shape around the head.

[0005]

To this end, the biomagnetism measuring apparatus of the present invention is designed so that the direction perpendicular to the two-dimensional plane is x,
Let y be the direction orthogonal to the two-dimensional plane, z be the rotational direction of the xz plane be α, and θ be the rotational direction of the yz plane, the frame body 2 and the frame body 2 in the y direction A guide rail 6 movably provided, and a traveling roller 8 on the guide rail 6.
Support frame 9a provided so as to be movable in the x direction
And a support base 9c provided on the support frame 9a so as to be movable in the z direction via a rod 9b, and a detector mounting frame 1 provided on the support base 9c so as to be rotatable in the α and θ directions.
5, an elevating frame 20 provided on the detector mounting frame 15 so as to be movable in the z direction via a column 19, and a magnetic detector 22 mounted on the elevating frame 20. It should be noted that the numbers added to the above-mentioned configurations are for comparison with the drawings in order to facilitate understanding of the present invention, and the configurations of the present invention are not limited thereby.

[0006]

In the present invention, for example, as shown in FIG.
The guide rail 6 is horizontally moved by the y-direction drive motor 7, the support frame 9a is horizontally moved by the x-direction drive motor 11 along the guide rail 6, and the support base 9c is vertically moved by the z-direction main drive motor 13. , Α direction around the shaft 14 by the α direction drive motor 16,
The θ-direction drive motor 18 rotates about the shaft 17 in the θ-direction, and the elevating frame 20 is vertically moved along the column 19 by the z-direction fine adjustment drive motor 21.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show one embodiment of the biomagnetism measuring device of the present invention, FIG. 1 is a side view, and FIG. 2 is a front view seen from the direction A in FIG. In the drawings, x and y are directions orthogonal to each other on a two-dimensional plane, z is a direction orthogonal to the two-dimensional plane, α is a rotation direction of the xz plane, and θ is a rotation direction of the yz plane. .

In FIGS. 1 and 2, a frame body 2 is assembled in the magnetically shielded room 1, a measurement bed 3 is arranged under the frame body 2, and an adjustment handle 4 is provided on the measurement bed 3. A backrest 5 is provided which allows the angle to be changed. A pair of guide rails 6 made of H-shaped steel are movably provided in the middle of the frame body 2 above the measurement bed 3 with respect to the frame body 2. The guide rails 6 are moved in the y direction by a y-direction drive motor 7. It can be moved horizontally.

A plurality of traveling rollers 8 are sandwiched between the upper and lower surfaces of the guide rail 6, and a supporting frame 9a is attached to the traveling rollers 8. A slit 10 is formed in the guide rail 6, the rotary shaft of the x-direction drive motor 11 is supported by the support frame 9a through the slit 10, and the gear 12 driven by the x-direction drive motor 11 is a guide rail. The support frame 9a is horizontally movable in the x direction by meshing with a rack formed on the inner surface of 6. Further, the support frame 9a is vertically movable by a plurality of rods 9b, and the support base 9 is provided below the rods 9b.
c is fixed. A z-direction main drive motor 13 is mounted on the support 9c, and the entire support 9c is vertically movable in the z-direction.

A detector mounting frame 15 is rotatably provided on the support base 9c about a shaft 14 and is rotatable by ± 30 ° in the α direction (FIG. 1) by an α direction drive motor 16. There is. Further, the detector mounting frame 15 has a shaft 17
Is rotatable about a center of rotation, and is rotated ± 10 ° in the θ direction (FIG. 2) by the θ direction drive motor 18.
As shown in FIG. 2, a plurality of columns 19 are provided in the detector mounting frame 15 in the vertical direction, and an elevating frame 20 is vertically movably mounted on the columns 19, and a z-direction fine adjustment drive motor 21 is provided. It is possible to move up and down in the z direction. Then, the magnetic detector 22 incorporating the SQUID is attached to the elevating frame 20.

FIGS. 3 to 6 are enlarged views of the respective driving portions in FIGS. 1 and 2, FIG. 3 is an enlarged rear view seen from the back side of FIG. 2, and FIG. 4 is seen from the B direction of FIG. FIG. 5 is an enlarged side view, FIG. 5 is an enlarged front view seen from the direction C in FIG. 4, and FIG. 6 is an enlarged front view showing the z-direction moving mechanism.

In FIG. 3, the z-direction fine adjustment drive motor 21 is attached to the lower portion of the detector attachment frame 15, and its screw shaft 23 is screwed into the lower elevating frame 20. The frame 20 moves up and down.

As shown in FIGS. 3 and 4, a bearing 24 is mounted on the side surface of the detector mounting frame 15, and a screw shaft 25 connected to the α-direction drive motor 16 is rotatably supported on the bearing 24. Has been done. A sliding body 26 is screwed onto the screw shaft 24, and the sliding body 26 is connected to the support 9c via a bracket 27. With this configuration, when the α-direction drive motor 16 is driven and the screw shaft 24 rotates, the sliding body 26 moves in the direction of the arrow shown in the drawing, and the detector mounting frame 15 is rotated about the shaft 14 in the α-direction.

As shown in FIGS. 4 and 5, a support base 9c is provided.
A bearing 28 is attached to the end of the shaft 28, a screw shaft 29 connected to the θ-direction drive motor 18 is rotatably supported by the bearing 28, and a sliding body 30 is screwed onto the screw shaft 24. With this configuration, when the θ-direction drive motor 18 is driven and the screw shaft 29 rotates, the sliding body 30 moves in the direction of the arrow in the figure, and the support base 9c is rotated about the shaft 17 in the θ direction.

In FIG. 6, the support frame 9a is slidable on a rod 9b, and a support base 9c is fixed to the lower portion of the rod 9b. The support base 9c is provided with a screw shaft 31 in the vertical direction, and the lower end of the screw shaft 31 meshes with a gear 32 connected to the z-direction main drive motor 13. With this configuration, the z-direction main drive motor 1
When 3 drives and the gear 32 and the gear shaft 31 rotate, the gear shaft 31, the rod 9b, and the support base 9c move in the z direction.

Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment and various modifications can be made. For example, in the above embodiment,
Although each moving member and rotating member are driven by a motor, they may be driven by a manual handle.

[0017]

As is apparent from the above description, according to the present invention, the magnetic detector can be moved with high accuracy along the shape around the head.

[Brief description of drawings]

FIG. 1 is a side view showing an embodiment of a biomagnetism measuring device of the present invention.

FIG. 2 is a front view seen from the direction A in FIG.

3 is an enlarged rear view seen from the back side of FIG. 2. FIG.

FIG. 4 is an enlarged side view seen from the direction B in FIG.

5 is an enlarged front view seen from the direction C in FIG.

FIG. 6 is an enlarged front view showing the z-direction moving mechanism of FIG. 1.

[Explanation of symbols]

1 ... Magnetically shielded room, 2 ... Frame, 3 ... Measuring bed,
6 ... Guide rail 7 ... Y-direction drive motor, 8 ... Traveling roller, 9a ... Support frame, 9b ... Rod 9c ... Support base, 11 ... X-direction drive motor, 13 ... Z-direction main drive motor 15 ... Detector mounting frame, 16 ... α-direction drive motor 18 ... θ-direction drive motor, 19 ... Struts, 20 ... Lifting frame 21 ... Z-direction fine adjustment drive motor, 22 ... Magnetic detector

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Yoshinobu Nishiyama 1-3-2 Shibaura, Minato-ku, Tokyo Shimizu Construction Co., Ltd. (72) Inventor Noboru Ishikawa 1-3-2 Shibaura, Minato-ku, Tokyo Shimizu Construction Co., Ltd.

Claims (1)

[Claims] 1. A direction orthogonal to a two-dimensional plane is defined as x and y, a direction orthogonal to the two-dimensional plane is defined as z, a rotation direction of the xz plane is defined as α, and a rotation direction of the yz plane is defined as θ. In this case, the frame body, a guide rail provided on the frame body so as to be movable in the y direction, a support frame provided on the guide rail so as to be movable in the x direction by a traveling roller, and a rod provided on the support frame. Support movably provided in the z direction, a detector mounting frame rotatably provided in the support in the α and θ directions, and a detector mounting frame movably in the z direction via a column. A biomagnetism measuring device comprising: an elevating frame provided and a magnetic detector mounted on the elevating frame.