JPH01146531A - Magnetic resonance imaging apparatus - Google Patents

Abstract

PURPOSE:To display an image without being affected by a magnetic field, by directly surrounding the whole of an image display body of a monitor television excepting the display picture by a magnetic shield. CONSTITUTION:In an MRI apparatus, the whole of a CRT excepting a display picture is directly surrounded by a magnetic shield material 2 with respect to the CRT 1 of a monitor television. The MRI apparatus main body 10 is equipped with a probe 2 for transmitting a high frequency exciting pulse and receiving an MR signal under the static magnetic field formed by a main magnet 11 and each of inclined magnetic coils 13 for applying the cinclined magnetic fields of X-, Y- and Z- channels to the static magnetic field in a superposed state, other than the main magnet 11 for generating the static a magnetic field becoming a high magnetic field. Further, a control computer 14 for controlling the MRI apparatus main body 10 according to a predetermined pulse sequence and receiving the MR signal to perform image reconstitution processing and the monitor television 15 having the CRT 1 as a principal part are mounted. Therefore, the display and operational display of a reconstituted image on the display picture of the CRT 1 can be performed without being affected by the high magnetic field generated in the MRI apparatus main body.

Description

Detailed Description of the Invention [Objective of the Invention] (Field of Industrial Use) The present invention performs image reconstruction using magnetic resonance signals (hereinafter referred to as MR signal 9) extracted by magnetic resonance phenomena. A magnetic resonance imaging device (hereinafter referred to as MR [
In particular, a magnetic shield is installed so that images can be displayed without being affected by the magnetic field environment. i
(Regarding revision 1 of the system configuration.

(Prior Art) In general, an MRI apparatus is equipped with a monitor television that displays the operation contents and image reconstruction contents on the CRT display screen in order to display various operations and image reconstruction for diagnosis. I am using it.

This monitor television is designed to save space in MRIH equipment, or to use high magnetic JA
In order to realize MRI shielding, monitor previsions that are resistant to magnetic field environments are now required.

However, in the conventional case, the entire casing of the monitor television was surrounded by magnetic shielding material, so the CRT
The magnetic shielding effect was insufficient.

(Problems to be Solved by the Invention) In other words, in conventional MRI apparatuses, magnetic shielding material is attached to the inner surface of the casing of the monitor television, or the periphery of the casing is surrounded by magnetic shielding material. The lines of magnetic force during the cocoon shape often entered the space formed between the inner surface of the casing and the outer surface of the CRT.

When magnetic lines of force enter the area around the CRT, the display screen of the CRT will be affected by the magnetic field and will be disturbed.

Moreover, when a magnetic shielding material is attached to the inner surface of a monitor television, care must be taken to prevent the circuit board from coming into contact with the magnetic shielding material, which is disadvantageous from the standpoint of device design.

An object of the present invention is to configure a monitor television that can display images without being affected by the magnetic field in an MRI apparatus that creates a high magnetic field environment.

[Structure of the Invention] (Means for Solving the Problems) In order to achieve the above object, the present invention provides a magnetic shielding material for the entire image display body excluding the display screen for the image display body of a monitor television. The main point is that they were directly surrounded by the enemy.

(Function) In the MRI apparatus according to the present invention, there is no space around the image display body through which magnetic lines of force enter, so that the shielding effect is good. Therefore, an image can be displayed on the display screen of the image display body without being affected by the magnetic field.

(Embodiment) FIG. 1 is a block diagram schematically showing the main parts of an embodiment of the present invention.

In the MRI neck mounting according to this embodiment, the entire CRT of a monitor television except for the display screen is directly surrounded by the magnetic shielding material 2.

This magnetic shielding material 2 is made to extend a predetermined length L in front of the display screen of the CRTl.

In this case, the magnetic shielding material 2 has <C
It is preferable to apply a shield case 2a having a housing structure capable of housing the RTl from the rear.

The shield case 2a is a container structure that has a pyramidal shape that matches the CRTl, and has a depth that allows the bottom of the pyramidal shape to protrude beyond the display screen of the CRTI.

Therefore, the CRTl is housed in the shield case 2a from the rear, and the CRTl is installed as shown in FIG.
Tl can be fixed collinearly.

CR directly surrounded by the magnetic shielding material 2 in this way
By using Tl as the main structure of the monitor television, a problem occurs in the MRI apparatus main body as shown in FIG.

The reconstructed image can be displayed and operated on the CRTI display screen without being affected by the Th1ta field.

In addition, the MHI device main body 10 shown in FIG. ), and gradient magnetic field coils 13 that apply gradient magnetic fields such as X, Y, and Z channels in a superimposed manner to the static magnetic field produced by the main magnet 11.

A control computer 14 which controls the MRI apparatus main body 10 according to a predetermined pulse sequence and performs image reconstruction processing upon receiving the MR multiplied signal, and a monitor television whose main part is a CRTI as shown in FIG. john 1
5 constitutes an MRI apparatus according to an embodiment of the present invention.

In the MRr device according to the embodiment of the present invention, since the entire CRTl except for the display screen is directly surrounded by the magnetic shielding material 2, the lines of magnetic force generated from the main magnet 11yf are not directed around the CRTl. This can prevent 12 people from doing so. Therefore, the magnetic shielding effect for CRTl is improved.

In particular, in this embodiment, the magnetic shielding material 2 is CRTl
Since the CRT 1 is extended in front of the display screen by a predetermined length L, the lines of magnetic force α can be prevented from reaching the display screen of the CRT1 as much as possible, as schematically shown in FIG. Therefore, the CRTI display screen is less susceptible to disturbances in the magnetic field.

Note that if the magnetic shielding material 2 is not extended in front of the display screen of the CRTI, there is a possibility that the lines of magnetic force α may wrap around as schematically shown in FIG.

In any case, since most of the CRT 1 is covered with the magnetic shielding material 2, the magnetic shielding effect for the CRT is better than in the past.

[Effects of the Invention] As explained above, in the present invention, since the entire image display body except the display screen is shielded with a magnetic shielding material, the magnetic shielding effect on the image display body is good, and the MRI apparatus can be space-saving and high-performance. It is extremely useful when creating a magnetic field.

[Brief explanation of the drawing]

Fig. 1 is a configuration diagram showing an outline of the main parts of an embodiment of the present invention, and Fig. 2 shows a shielding case and a CR constituting the magnetic shielding material.
FIG. 3 is a perspective view showing the relationship between T and FIG. 3 is a schematic diagram of an MRI apparatus to which the present invention is applied, and FIGS. It is an explanatory diagram. 1...CRT 2...Magnetic shield material 2a...Shield case 3...Mounting screw 10.
...MRI device body 11...Main magnet 12...Probe 13...Each gradient magnetic field coil 14...For control] Nbuke 15...Monitor television television agent block ``Udo Norichika 5Q f right

Claims (3)

[Claims] (1) A high-frequency excitation pulse is emitted under a static magnetic field to extract a magnetic resonance signal from a desired part of the subject, an image is reconstructed using the extracted magnetic resonance signal, and the reconstructed image is displayed on an image display. A magnetic resonance imaging apparatus for displaying an image on a display screen, characterized in that the entire image display body, excluding the display screen, is directly surrounded by a magnetic shielding material. . (2) The magnetic resonance imaging apparatus according to claim 1, wherein the magnetic shielding material is a shielding case having a housing structure capable of housing the image display body from the rear. (3) The magnetic resonance imaging apparatus according to claim 1, wherein the magnetic shield material extends a predetermined length in front of the display screen of the image display body.