JPS60207653A - Diagnostic apparatus by nuclear magnetic resonance - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical field to which the invention pertains] The present invention relates to an information exchange device using an air speaking tube between a subject of a diagnostic apparatus using nuclear magnetic resonance and an operator located outside the room.

[Description of prior art]

In the xH computed tomography apparatus, a microphone and a speaker are installed near the opening of the gantry, and audio information is exchanged via an amplifier and a microphone and speaker separately installed near the operator.

However, in principle, with devices that utilize nuclear magnetic resonance, it is necessary to place the subject in a highly uniform static magnetic field, and it is not possible to place ferrous objects within the scanning range that would disturb the magnetic field distribution. . Commonly used speakers and microphones cannot be used because they inevitably disturb the magnetic field. Although capacitor-type speakers and microphones do not use magnetism, they require a large area of conductor film and high voltage, and combine with the weak high-frequency magnetic field generated within the scanning range of nuclear magnetic resonance, resulting in noise. Furthermore, it is not desirable for safety reasons to use high voltage near a subject as a medical device. Normally, diagnostic equipment is placed inside a high-frequency shielded room, and the operating desk is installed outside the shielded room, but in order to maintain the shielding effect of the shielded room, electrical wiring such as microphone cables must be routed both inside and outside the shield. is undesirable because it brings outside electromagnetic waves into the shielded room.

As described above, in the case of a diagnostic apparatus using nuclear magnetic resonance, the information exchange apparatus using the conventional technology has many problems. However, it is indispensable for the operator to give voice instructions to the subject, such as to stop breathing or position, to listen to requests from the subject, and to monitor abnormalities such as breathing sounds.

[Object of the Invention] An object of the invention is to provide a device that allows a subject and an operator to exchange voice information without affecting the operation of a nuclear magnetic resonance diagnostic device.

[Features of the invention]

The present invention is characterized by allowing the patient and operator to exchange audio information via an air speaking tube made of non-magnetic and non-conductive material that does not disturb the magnetic field.

That is, in the present invention, a means for irradiating electromagnetic waves to a subject, a means for detecting a response to the electromagnetic waves, and a means for detecting a response to the electromagnetic waves, which are placed in a room shielded from electric F41, and an operator located outside the room with the subject. In a nuclear magnetic resonance diagnostic apparatus, the voice transmission means has one end opened near the position where the subject is placed, and the other end opened in the vicinity of the position where the subject is placed. is characterized in that it includes a conduit that opens to the outside of the room, and that the conduit is made of a non-magnetic and non-conductive material. The voice transmission means includes a microphone and a speaker provided at the open end of the conduit outside the room;
Preferably, the conduit is provided with electromagnetic shielding at the room boundaries.

[Explanation based on examples]

FIG. 1 is a block diagram of an apparatus according to an embodiment of the present invention. A diagnostic device 1 based on nuclear magnetic resonance measures nuclear magnetic resonance of atomic nuclei within the subject's body by irradiating electromagnetic waves from multiple directions on a tomographic plane perpendicular to the body axis, and uses the data to create an original tomographic image. This is a device that reconstructs images into images. It is used to accurately position the photographing position of the subject who is thrown off by the bed 2 within the photographing area of the main body of the diagnostic apparatus.

Here, as a transmission means for mutually transmitting audio between the subject 3 and the operator 5 who is outside the electromagnetically shielded room 4,
A transmission tube 6 is provided, one end of which opens through an opening 7 near the position where the subject 3 is placed, and the other end opens outside the room through an opening 8. A microphone 9 and a speaker 10 are provided in an opening 8 outside the room. The microphone 9 is connected to a speaker 12 near the operator 5 through an amplifier 11, and the speaker 10 is connected to a microphone 14 near the operator 5 through an amplifier 13.

FIG. 2 shows a partial structure of the speaking tube 6. The speaking tube 6 is made of a non-magnetic and non-conductive material such as a vinyl chloride tube. Metal speaking tubes are not preferred due to high frequency and electrical and mechanical safety concerns for the subject.

FIG. 3 is a cross-sectional structural diagram of an example of shielding the entrance/exit portion of the shield wall of the speaking tube. A metal pipe 16 is inserted between the shield wall 15 and the transmission tube 6, and a wire mesh 17 is provided inside the transmission tube in the shield wall portion, connected to the metal pipe 16, and further, the metal pipe 16 is grounded.

That is, in the present invention, when an operator who is outside an electromagnetically shielded room in which a nuclear magnetic resonance diagnostic device is installed, for example, gives instructions to a subject, the voice is transmitted through the microphone 14.
The audio signal is converted into an electrical signal, which is amplified by the amplifier 13, and then converted back into an audio signal by the speaker IO and transmitted to the subject via a speaking tube.

The response from the subject is similarly passed through a transmission tube, converted into an electrical signal by the microphone 9, amplified by the amplifier 11, further converted into an audio signal by the speaker 12, and transmitted to the operator.

Outside an electromagnetically shielded room, the use of electroacoustic conversion circuits is not a problem, and the speaking tube that directly propagates the sound must be as short as possible to avoid the sound becoming unclear due to sound attenuation. It has an additional electroacoustic conversion circuit such as a microphone and speaker.

In addition, electromagnetic shielding is applied to the passage of the transmission tube in the shield wall of the electromagnetically shielded room, so that electromagnetic waves from the outside are blocked here.

〔Effect of the invention〕

By using an air transmitting tube made of non-magnetic and non-conductive material for the device that exchanges voice IH information between the patient and the operator outside the electromagnetically shielded room, the diagnostic device itself uses nuclear magnetic resonance. High-quality diagnostic images can be obtained without deteriorating the operation of the system.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a voice transmission means of an apparatus according to an embodiment of the present invention. Figure 2 is a structural diagram of a speaking tube. FIG. 3 is a cross-sectional structural diagram of a portion showing an example of shielding from an external magnetic field at the entrance and exit portion of a shield wall of a room that is electromagnetically shielded from a speaking tube. 1...Diagnostic device using nuclear magnetic resonance, 2...Bed, 3
... Subject, 4... Electromagnetic shielding room, 5... Operator,
6... Speaking tube, 7... Opening of the speaking tube inside the nuclear magnetic resonance diagnostic device, 8... Opening of the speaking tube outside the electromagnetic shielding room, 9.14... Microphone, 10.12...
Speaker, 11.13... Amplifier, 15... Shield wall of electromagnetic shielding room, 16... Metal pipe, 17...
wire mesh. Patent applicant Yokogawa Medical Systems Co., Ltd. Agent
Patent Attorney Nao Takashi Ide

Claims (3)

[Claims] (1) A means placed in an electromagnetically shielded room to irradiate the subject with electromagnetic waves, a means to detect a response to the electromagnetic waves, and a means for communicating between the subject and an operator outside the room. In a nuclear magnetic resonance diagnostic apparatus, the voice transmission means has one end opened near the position where the subject is placed, and the other end opened near the position where the subject is placed. What is claimed is: 1. A nuclear magnetic resonance diagnostic device comprising a conduit opening to the outside, the conduit being made of a non-magnetic and non-conductive material. (2) The nuclear magnetic resonance diagnostic apparatus according to claim (1), wherein the transmission means includes a microphone and a speaker provided at an open end of the conduit outside the room. (3) A diagnostic apparatus using nuclear magnetic resonance according to claim 11, wherein the conduit is electromagnetically shielded at the boundary position of the room.