JPH02224645A - Nuclear magnetic resonance imaging device - Google Patents

Abstract

PURPOSE:To allow an object to be relaxed without giving an oppressed feeling to the object by forming a gantry opening and a high frequency coil in rectangular cylindrical shapes in approximately the same shape to be oblong in a gantry lateral direction, and simultaneously, providing an arm rest to be stored or to be attached/detached to/from a bed to layingly place the object. CONSTITUTION:A coil 19 with a laterally wide rectangular section is wound along the outer shape of a resin bobbin 18, and a high frequency irradiating coil is formed. A current flowing in the coil 19 flows like an arrow 20, and a high frequency magnetic field is generated like an arrow 21. To the inner diameter side of the resin bobbin 18, a painting for dressing is executed because it is made into the cover of the gantry opening. A gantry 15 having the oblong rectangular resin bobbin 18 and a bed 16 having a top board 2 to lay the object and a head receiver 14 to load a head part are arranged at a certain space. A groove 6 is provided on an arm rest 1, a roller 3 fitted by a fitting 4 rotatably to the top board 2 is made into a guide, and the arm rest 1 is moved.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a nuclear magnetic resonance imaging apparatus (hereinafter abbreviated as an MR display apparatus), and particularly to an MRI apparatus equipped with a retractable arm rest or a removable bed. Regarding location.

[Conventional technology]

First, the high frequency coil and bed in the MHI device will be described. The conventional high-frequency irradiation coil uses a saddle-shaped coil 22, as shown in FIG. 5, and has a cylindrical shape. In addition, the saddle-shaped coil 22 is generally fixed to a resin bobbin 23, and the diameter of the bobbin 23 is the MRI apparatus main body (hereinafter referred to as
This is the opening of the gantry. In addition, the caliber is
Due to the magnetic field generation efficiency of the magnet, the size is small enough to allow the subject to enter the opening, and its diameter is approximately 60an, allowing the subject to take a comfortable posture with their arms spread out within the gantry opening. This may cause discomfort to the subject.

Additionally, the subject had to be held in an awkward position for a long time to be photographed, which caused the subject to move and cause motion artifacts, which caused many electrical points.

Next, the bed in the MHI device will be described. As mentioned above, since the gantry opening diameter is approximately 60a11, the width of the top plate of the bed cannot be increased. Further, even if it were possible to widen the gantry opening diameter, widening the bed width would make it difficult for the operator to handle the subject.

[Problem to be solved by the invention]

The above-mentioned conventional technology does not take into account the fact that it causes discomfort to the subject, and has problems such as motion artifacts being more likely to occur. Further, if a protruding member is provided on the side of the bed in the longitudinal direction, it will be unstable for both the operator and the patient, resulting in poor operability when transferring the patient from the stretcher to the bed.

An object of the present invention is to avoid impairing the operability and safety of transferring from a stretcher to a bed, and to avoid forcing a subject into an unreasonable posture on the bed.

[': Means to solve problem a]

The above problem consists of a gantry that incorporates magnetic field generating means for a static magnetic field and a gradient magnetic field, and has an opening for inserting the subject into the imaging position formed by the magnetic field generating means, and a gantry that transmits electromagnetic waves to the imaging site of the subject. A nuclear magnetic field comprising: a high-frequency coil for irradiating; a receiving coil for detecting nuclear magnetic resonance signals that is attached almost closely to the imaging region of the subject; and a bed on which the subject lies and moves the imaging region to the center of imaging. In the resonance imaging apparatus, the gantry opening and the high-frequency coil are formed into substantially the same rectangular cylinder shape extending in the gantry width direction, and the bed on which the subject is placed is provided with a retractable or detachable arm rest. Solved by

[Effect]

Making the high-frequency coil wide in the width direction of the gantry creates a space within the opening where the subject can spread their arms and take a comfortable posture, and providing an arm rest on the bed allows the subject to take a comfortable posture. Providing comfort and retractable or removable arm rests on the bed allows the stretcher to be as close as possible to the bed. It works to improve handling of the subject.

Furthermore, because of the above effects, the subject is relaxed as a whole, and there is also an effect of reducing motion artifacts.

〔Example〕

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. FIG. 4 is a diagram showing the high frequency coil of the present invention. A coil 19, which is a saddle-shaped coil 22 shown in FIG. 5 whose cross section is changed from a circular cross section to a laterally wide rectangular cross section, is wound along the outer shape of the resin bobbin 18 to form a high frequency irradiation coil. The current flowing through the coil 19 flows as indicated by an arrow 2o, and a high frequency magnetic field is formed as indicated by an arrow 21. The inner diameter side of the resin bobbin 18 is coated with a decorative coating to serve as a cover for the gantry opening. Since this coil is a modified version of the saddle-shaped coil shown in Fig. 5, problems such as non-uniformity of the high frequency magnetic field and efficiency arise. Experiment, L
It has been confirmed that there is no practical problem if the relationship is /D≧1.

This means that you have secured the arm rest space mentioned above.

FIG. 3 shows an external view of the gantry and bed. Opening height 4
70nwn, I4 opening width 1,000mm (7) A gantry 15 having a horizontally long rectangular resin bobbin 18, a bed 16 having a top plate 2 on which the subject lies, and a head holder 14 on which the head is placed are spaced apart from each other. It is located.

Next, a bed according to an embodiment of the present invention will be explained using FIG. FIG. 1 is a three-dimensional view of the top plate 2 viewed from an angle. The arm rest 1 has a groove 6 cut therein, and a roller 3 rotatably attached to the top plate 2 with a fixture 4 serves as a guide.
It has a structure in which the arm rest 1 moves. The arm rests 1 are provided as a pair symmetrically on both sides of the lower surface of the top plate 2. Since the roller 3 is inserted into the groove 6, the arm rest 1 can be prevented from coming off in the vertical direction. By providing a stopper 5 at the end of the arm rest 1, this structure prevents the arm rest 1 from being pulled out too much in the direction of the arrow 7 and coming off the top plate 2. Also, a stopper is provided at the other end to serve the opposite purpose. A bar-shaped counterbore 8 provided at the bottom of the arm rest 1 is a part on which a finger is placed when the arm rest 1 is pulled out.

Another embodiment of the present invention will be described below with reference to FIG. FIG. 2 shows the structure of the top plate 2 above the bed 16. The top plate 2 has a groove 9 in the body axis direction. Further, the arm rest 11 has a protrusion 1o, which can be fitted into the groove of the top plate 2 as shown by an arrow 12. The groove 9 of the top plate 2 is sufficiently longer than the length of the arm rest 11 in the body axis direction, and has a structure that allows movement in the body axis direction as indicated by the arrow 13.

〔Effect of the invention〕

According to the present invention, the high frequency irradiation coil is widened in the width direction,
An arm rest for the subject is provided, which has the advantage of allowing the subject to relax without feeling pressured.

[Brief explanation of the drawing]

Fig. 1 is a bottom three-dimensional view of the top plate of one embodiment of the present invention, Fig. 2 is a three-dimensional view of the top plate of another embodiment of the invention, Fig. 3 is an external view of the gantry and bed, and Fig. 4 5 is a three-dimensional external view of a high-frequency irradiation coil according to an embodiment of the present invention, and FIG. 5 is a three-dimensional external view of a conventional high-frequency irradiation coil. 1... Arm rest, 2... Top plate, 3... Roller, 4...
...Bracket, 5...Stopper, 8...Bar-shaped counterbore, 9...Groove, 10...Protrusion, 11...Arm rest, 1
5...Gantry, 16 yen 1 Mouth atrophy 2 Figure/Destruction 40

Claims (1)

[Claims] 1. A gantry containing magnetic field generating means for a static magnetic field and a gradient magnetic field and having an opening for inserting the subject into the imaging position formed by the magnetic field generating means, and irradiating electromagnetic waves to the imaging site of the subject. nuclear magnetic resonance imaging comprising: a means for detecting nuclear magnetic resonance signals attached almost closely to the imaged region of the subject; and a bed on which the subject lies and moves the imaged region to the center of imaging. In the device,
Nuclear magnetic resonance imaging characterized in that the gantry opening and the high-frequency coil are formed into substantially the same rectangular cylinder shape extending in the gantry width direction, and the bed on which the subject is placed is provided with an arm rest. Device.