JPH0221846A - Magnet system for nuclear magnetic resonance diagnostic apparatus - Google Patents

Abstract

PURPOSE:To eliminate the need of taking an object outside the magnet portion every time various coils are detached by forming an opening portion in the orthogonal direction and horizontal direction to the major axis of the object. CONSTITUTION:The above magnet system 3 has opening portions in three directions. One is opened in the orthogonal and horizontal directions to the direction of the major axis of an object disposed between magnets 13, 14. A pallet 19 is received by the upper edge of a receiving plate 23, horizontal rails 24 are fixed to the plate surface of the receiving plate 23, and the rails 24 are clamped from above and below by rollers 25. When the pallet 19 moves in the direction of the axis of the body in the magnet portion, the receiving plate 23 is lowered under a cover 18. The carry-in-and-out operation of the pallet 19 is such that the receiving plate 23 is raised above the cover 18 to receive the pallet 19 by the receiving plate 23, stopped in a position where wheels 22 of the pallet 19 are dislocated from a groove 21, and in such a condition. a connecting rod 35 or the pallet 19 is drawn in the direction orthogonal to the axis of the body, so that the pallet 19 is carried out of the magnet portion.

Description

[Detailed Description of the Invention] "Industrial Application Field" This invention is used in a nuclear magnetic resonance diagnostic apparatus that performs medical examinations by obtaining tomographic images of a subject (patient) placed in a magnetic field using nuclear magnetic resonance. related to magnet systems.

``Prior Art'' As shown in FIGS. 10 to 12, a conventional magnet system of this type has a magnet part 1) connected to a bed 1 for accessing a subject.
2 were to be moved in and out from the longitudinal direction of the subject.

``Problems to be Solved by the Invention'' In conventional magnet systems, the subject access head is provided outside the magnet on the longitudinal extension of the subject within the magnet. This has the drawback that the distance for entering and exiting is long and that a large space is required, including the bed itself, which is placed outside the magnet.

In conventional magnet systems, there is no opening in the magnet part 1) in the direction perpendicular to the long axis of the subject, making it impossible for the examiner to manually change the orientation of the subject inside the magnet part. .

Since the distance from the patient access bed to the center of the magnet was relatively long, it took time to move the patient in and out. Furthermore, since the subject cannot be viewed from the outside while the subject is placed inside the magnet, a subject monitoring device is required.

"Means for Solving the Problem" According to this invention, opposed magnets have openings in three directions,
One of the openings is opened horizontally and in a direction perpendicular to the longitudinal direction of the subject placed within the magnet. A mechanism for accessing the subject from a direction perpendicular to the long axis direction of the subject is added.

Embodiment J Figures 1 and 2 show an embodiment of the present invention, with Figure 1 being a side view and Figure 2 being a front view.Magnets 13 and 14 are arranged facing each other. 3.14 are connected by a yoke 15 having a U-shaped cross section, and a pole piece 16.17 is attached to the opposite surface of the magnet 13.14.The yoke 15 constitutes a frame.

A cover 18 covers the inner surface of the magnet portion.

This magnet system thus has openings in three directions,
One opening is horizontal and perpendicular to the long axis direction of the subject placed between the magnets 13 and 14.

FIG. 3 is a side view of the object handling pallet 19 positioned inside the magnet section, and FIG.
As shown in FIG. 5, two grooves 21 in the long axis direction of the subject are formed in the cover 18, and the valent 19
A wheel 22 attached to the holder is fitted into the holder so that the wheel 22 can be moved.

A grooved plate may be provided separately from the cover 18.

FIG. 6 shows a front view of FIG. 3, and FIGS. 6 and 7 show a mechanism for moving the pallet 19 in a direction perpendicular to its longitudinal axis and moving it up and down. This mechanism is provided on the left and right sides as shown in FIG. 6, and a pallet 19 is placed on these mechanisms. That is, the valent 19 is received at the upper edge of the receiving plate 23, a horizontal rail 24 is fixed to the surface of the receiving plate 23, and the rail 24 is sandwiched between the rollers 25 from above and below. The roller 25 is attached to a pedestal 26 facing the holder vi23. In order to smoothly move down the hill, a metal fitting 28 to which a slide shaft 27 is fixed is fixed to the pedestal 26, a stay 31 is fixed to the pedestal 29, a holder 32 holding a slide bearing is fixed to the stay 31, A slide shaft 27 is inserted into the slide bearing of the receiver 32 so that it can move up and down. A support 33 is fixed to the center of the pedestal 26, and a cylinder 34 connected to the support 33 is fixed to the pedestal 29. This mechanism on both sides is connected to the receiver vi 23 by a connecting rod 35.

When the pallet 19 moves in the body axis direction within the magnet section, the receiving plate 23 is lowered below the cover 18 as shown in FIG. In order to move the pallet 19 in and out, the receiving plate 23 is raised from the cover 18, the pallet 19 is received by the receiving plate 23, and the wheels 22 of the pallet 19 stop at a position out of the groove 2I. By pulling the pallet 19 in a direction perpendicular to the body axis, the pallet 19 is carried out of the magnet section. When carrying in the pallet 19, the reverse operation is performed, and FIG. 8 shows a situation in which the pallet 19 is carried out.

In this example, the driving in the direction of the body axis inside the magnet part of the pallet and the driving in the direction perpendicular to the body axis during loading and unloading were shown to be done manually, but this can be done automatically using a mechanism such as a rack and pinion and a motor. You can move it with Also palette 19
may be rotated as shown in FIG. 9 to carry it in and out of the magnet section.

"Effects of the Invention" As described above, according to the present invention, since the opening is formed in the direction perpendicular to the long axis direction of the subject and in the horizontal direction,
Since the examiner can access the subject inside the magnet through the opening, the subject does not need to be removed from the magnet each time the various coils are replaced, reducing diagnosis time. .

In the event of an emergency such as a fire while the subject (patient) is inside the magnet, the guide can quickly get close to the subject and guide the subject safely and quickly because dialogue is possible. I can do it.

In conventional systems, the distance to the center of the magnet in the body axis direction is wasted, but in the system of the present invention, this distance is eliminated, so the space in the body axis direction can be kept to a minimum. Therefore, this space can be effectively used in combination with an X-ray device.

It is possible to shorten the time required to set the subject at the center of the magnet from outside the magnet.

As shown in FIG. 8, since the bed main body is located within the magnet section, there is a large space around the pallet compared to when the pallet is within the magnet section, and this space can be used effectively.

There is no need for long lead wires or tubes, making it suitable for drip devices, electrocardiographs,
It also becomes easier to handle the pulse wave meter.

[Brief explanation of the drawing]

FIG. 1 is a side view showing an embodiment of the invention, and FIG. 2 is a side view showing an embodiment of the invention.
Figure 3 is a front view, Figure 3 is a side view showing the pallet set in the magnet section, Figure 4 is a side view showing the pallet wheel stuck in the groove, Figure 5 is the same as Figure 4. sectional view, Figure 6 is a front view showing the pallet set inside the magnet section, Figure 7 is a detailed perspective view of section A in Figure 6, and Figure 8 is the pallet taken out of the magnet section. A side view showing the condition,
FIG. 9 is a perspective view showing an embodiment in which a pallet is rotated and carried into and out of the magnet section, and FIGS. 10 to 12 are perspective views showing conventional magnet systems, respectively. Patent applicant: Asahi Kasei Industries, Ltd.

Claims (2)

[Claims] (1) Nuclear magnetic resonance diagnosis in which an opposing magnet has openings in three directions, one of which is perpendicular to the long axis direction of the object placed inside the magnet and horizontally. Magnet system for equipment. (2) The magnet system for a nuclear magnetic resonance diagnostic apparatus according to claim 1, further comprising a mechanism for accessing the subject from a direction perpendicular to the long axis direction of the subject.