JPS62233152A - Nuclear magnetic resonance imaging apparatus - 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] [Industrial Application Field] The present invention relates to a nuclear magnetic resonance imaging system*<hereinafter Mf(, I
This invention relates specifically to an air supply device for MLL I that provides forced air supply to the inside of an MRI magnet.

[Prior art]

An MRI system in which an object to be examined of a subject is imaged within a static magnetic field coil using nuclear magnetic resonance is configured as shown in FIG. 13. That is, a through hole ia is formed in the center of a static magnetic field coil 1 that generates a predetermined static magnetic field, and a gradient magnetic field generating coil 2 and a production coil 3 are arranged concentrically inwardly in this through hole 1a. A is provided. The test subject 4 is measured while lying on his back on a horizontally movable plate 5 provided within the detection coil 3 so as to be movable in a substantially horizontal direction. A head support 6 is attached to one end of the horizontally movable plate 5 and holds the head of the subject 4. Reference numeral 7 denotes a moving plate drive mechanism for moving the horizontally moving plate 5 in the horizontal and vertical directions.

In the MR, I having the vc configuration as described above, it is necessary to place the subject part of the subject 4 at approximately the center of the detection coil 3, so the subject 4 is placed on the horizontally movable board that moves in the direction of the central axis of the detection coil 3. The subject is placed inside the coil while lying on his/her back on the top of the body, and remains stationary in that position until the foot measurement is completed. The room in which the Ml-LIe is installed is controlled to constant temperature and humidity using an air conditioning device C (hereinafter simply referred to as air conditioning), but conventional MFLIs do not have forced ventilation inside the magnet, only natural ventilation. The inside of the magnet was ventilated by As a result, humidity increases and dew condensation occurs due to Subject 4's breathing, and heat from Subject 4 and Ml also accumulates in the 173 part, causing Subject 4 to sweat and feel uncomfortable. was there.

[Problem that the invention seeks to solve]

The present invention solves the problem of the conventional Mt (I) described above, in which the subject's discomfort increases due to insufficient ventilation inside the coil, and improves the test condition of the subject. The purpose is to provide MR,I.

[Means for solving problems]

In order to achieve the above-mentioned object, the present invention provides a through-hole formed in the center of the coil so that the test subject can be placed therein.
An air supply pipe having an injection hole opening on one surface is provided in a horizontally moving plate, and a nozzle connected to one end of this air supply pipe is provided at an end of the horizontally moving plate, and compressed air is sent to this air supply pipe. It is equipped with an air supply unit.

[Effect]

According to the above configuration, air can be directly delivered near the subject's face when the subject takes the test inside the coil,
In addition, since an airflow can be formed between the surface of the horizontally moving plate and the back of the subject, fresh air is sent near the subject, lowering the internal temperature and humidity, suppressing the subject's sweating, and improving the subject's examination status. It can be improved.

〔Example〕

Hereinafter, one embodiment of MRI according to the present invention will be described with reference to the drawings.

A first embodiment of the present invention is shown in FIGS. 1 to 8. In these figures, the same or equivalent parts as in the conventional example shown in FIG. 13 are designated by the same reference numerals. In Fig. 1, the horizontally moving plate 5
A main air supply pipe 5a and a branch pipe 5b that divides the main air supply pipe 5a into two directions are provided inside the main air supply pipe 5a, and a nozzle 8 is connected to the branch pipe 5b on the end face of the horizontally movable plate 5. It is provided. The other end of the main air supply pipe 5a is connected via a connecting fitting 9 and an air supply pipe 1 (Jr) to an air supply unit 11 that sucks and pressurizes air as shown in Figure @2.

On the air suction side of this air supply unit 11, an intake pipe 12 and an intake filter 13 for preventing suction of foreign matter are provided. Then, the indoor air is suctioned and pressurized by the air supply unit 11, and the air is sucked and pressurized by the air supply pipe 10. The air is blown out from the nozzle 8 through the main air supply pipe 5a and the branch pipe 5b into the opening of the head of the subject 4.

In this case, although the position # of the subject 4 with respect to the detection coil 3 changes depending on the part of the 6III leg, the relative position rttta between the subject 4 and the nozzle 8 does not change, so air is supplied to the determined position # regardless of the position in the horizontally moving plate. T can. Figures wca to @5 show details of the vicinity of the head 4a of the subject 4 viewed from three directions.As shown in Figure 6T, air can be supplied without providing any special protrusions on the inner surface of the coil. As shown in FIG. 6, the nozzle 8 includes a nozzle body 8a in which an air supply hole 8b and a spherical base 8c are formed, a seat 8d for rotatably supporting the nozzle body 8a, and a seat 8d for rotatably supporting the nozzle body 8a. It is composed of a mounting screw portion 8e formed on the outer periphery and a porous filter 8f mounted within this seat 8d. and catch seat 8d
The mounting threaded portion 8etfi of the horizontally movable plate 5 is provided with a screw hole SCR formed in the rattc of the horizontally movable plate 5, and is coupled and fixed to the horizontally movable plate 5. Further, the porous filter 8ffl is provided to remove foreign matter and reduce the noise of air blowing out.

As shown in FIGS. 7 and 8, a plurality of branch pipes 5d connected to the main air supply pipe 5a at almost right angles are embedded in the horizontal movement plate 5, and these branch pipes 5dvc
A plurality of ejection holes 5e having openings T are connected to the surface of the horizontally moving plate 5.

Next, the operation and effects of this embodiment will be explained. When pressurized air that has been purified from the air supply unit 11 via the intake filter 13 is supplied to the main air supply pipe 5a through the air supply pipe 10, a part of it is supplied from the nozzle 8 to the vicinity of the subject's head. This can prevent accidents such as oxygen deficiency. In addition, the other part is ejected to the surface from the ejection holes 5e formed in the horizontally movable plate 5, creating an air flow between the horizontally movable plate 5 and the back of the subject 4, lowering the temperature of this part and causing sweating. Discomfort can be reduced. Further, the air VC discharged from the nozzle 8 and the high temperature and high humidity condition inside the coil can be eliminated. Furthermore, piping for supplying air does not protrude near the subject 4, making it safe even when the subject is moved. And the relative position of the nozzle 8 and the subject 4 is &Itt
Since there is no LL, air can be supplied to the desired location regardless of the horizontal measurement position.

Embodiment @2 of the present invention is shown in FIGS. 9 and 10. In this embodiment, the amount of air ejected can be adjusted by adjusting the position of the horizontally movable plate 5. Normally subject 4 is 2I! The patient lies supine on the horizontal movement board 5 with a cloth or mat spread over it, but because the body pressure differs locally, the ventilation resistance differs in each part, and the central part of the body where the air flow is most needed. The flow rate tends to decrease. In this embodiment, a joint pipe 5f is embedded near the end of the horizontal movement &5 on the air inlet side at a substantially right angle to the longitudinal direction, and is connected to the main air supply pipe 5a and the branch pipe 5g, which are formed parallel to the longitudinal direction. They are connected to each other.

5h branches at the nozzle hole [5gA plurality of holes are drilled along Vc similar to the nozzle hole 5e in the first embodiment.

-! Reference numeral 51 denotes an air throttle valve, which is provided at the joint between the joint pipe 5f and the branch pipe 5g, so that the amount of air flowing into the collecting pipe 5f and the branch pipe 5g can be adjusted from the outside. .

FIG. 11 shows a third embodiment of the present invention. This example shows an intake structure when the amount of air is taken from indoor air. 14 is the MR, I installation room, and the upper part has an air conditioning cold air outlet 15, an air conditioning inlet 16, and an air volume and direction controller $
17 are provided respectively. This air volume/air direction adjustment mechanism 17 may also have a Fi electromagnetic wave shielding function. According to this embodiment, from the air conditioning line to the intake pipe 12. Low-temperature air can be sent to the horizontally movable plate 5 via the air supply unit 11 and the air supply pipe 10, and the air temperature on the blowout side as well as in the 1MR, I installation chamber 14 can be lowered.

FIG. 12 shows a fourth embodiment of the present invention, in which a superconducting electromagnet is used. In the figure, 18 is an oxygen concentration measuring device, and 19 is an oxygen concentration detection end of MR.

■They are provided at multiple locations in the upper and lower parts of the installation chamber 14. The oxygen level abnormal signal detected by the oxygen concentration measuring device 18 is sent to a three-way switching valve 21 via a signal cable 20. Reference numeral 22 indicates an outdoor intake pipe, 23 indicates an intake filter, and 24 indicates a building wall. In the T0 superconducting electromagnet, a large amount of liquid nitrogen and liquid helium are contained in the magnet Pg portion for cooling the coil. - If the superconducting conditions are broken for some reason, there is a risk that these liquids will turn into a large amount of vaporized gas and eject in a short period of time, emitting light 1111T into the room. For this reason, a system has been adopted that constantly measures the oxygen concentration in the room and issues an Fi alarm when an abnormality occurs. In this embodiment, the oxygen concentration measuring system and the above-mentioned air supply system are linked to ensure the safety of the test subject against oxygen deficiency during the test.

If the oxygen level falls below the specified value due to the gas released into the room, the alarm/buzzer 18a or buzzer will be activated to notify the operator of the abnormality, and at the same time, the air supply unit 1llc will be shut down. Send a command. When this air supply unit 11 receives the signal, it greatly increases its air supply capacity and increases the amount of air supplied from the nozzle 8 to the subject 14.
ensure the safety of This signal is also transmitted to the three-way switching valve 21, which switches the air source from the outlet 15 to an air supply source with higher safety requirements, such as outdoors, to supply a large amount of fresh air. Furthermore, the air supply unit 11 and the three-way switching valve 21 can be operated individually or simultaneously.

〔Effect of the invention〕

As described above, according to the present invention, air can be directly supplied to the subject inside the coil, and the high temperature and high humidity inside the coil can be eliminated. As a result, the test subject's discomfort can be alleviated and the test condition can be improved.

[Brief explanation of drawings]

FIG. 1 is a plan view showing the horizontal movement root according to the first embodiment of the MRI according to the present invention, It! Figure 2 is a side view of Figure 1; Figures 3, 4, and 5 are front views, top views, and side views of the subject's head in Figure 1; Figure 6 is the nozzle in Figure 1; FIG. 7 is a plan view showing the internal piping structure on the first surface, FIG. 8 is a sectional view of FIG. 7(2), and FIG. FIG. 10 is a partial sectional view showing the throttle valve of FIG. 9; factor 11 is a sectional view showing the third embodiment of the present invention;
FIG. 2 is a sectional view showing a fourth embodiment of the present invention, and FIG. 13 is a schematic configuration diagram of a conventional MEtI. ], 2. 3... Coil, 1a... Through hole, 4
...Test, 5...Horizontal moving plate s5a...Air supply main pipe, 5b, 5d. 5g...Branch pipe, 5e, 5h...Blowout hole, 5f...
・Collecting pipe, 51...Air throttle valve, 8...Nozzle%
8f... Porous filter, 11... Air supply unit,
14...MR, I room, 15...Air conditioner cold air outlet, 18...Oxygen! #Fast 9 lips ll Shoryo! 2 Genhaya 13 Prisoner

Claims (1)

[Claims] 1. In a nuclear magnetic resonance imaging apparatus in which a horizontally movable plate is provided in a through hole formed in the center of a coil so as to be freely removable, and a test subject is placed on the horizontally movable plate for examination. ,
An air supply pipe having a jet hole opening to the surface is provided in the horizontally movable plate, a nozzle connected to one end of the air supply pipe is provided at an end of the horizontally movable plate, and an air supply pipe is provided to send compressed air to the air supply pipe. A nuclear magnetic resonance imaging apparatus characterized by being provided with a gas unit. 2. A nuclear magnetic resonance imaging apparatus according to claim 1, wherein the nozzle is rotatably attached to an end of a horizontally movable plate via a porous filter. 3. A nuclear magnetic resonance imaging apparatus according to claim 1 or 2, characterized in that a collecting pipe having an air throttle valve is provided at one end of the air intake side of the air supply pipe. 4. Claims 1, 2, or 3 are characterized in that the air supply unit is connected to an air conditioning cold air outlet that controls the air in a room in which the nuclear magnetic resonance imaging apparatus is installed. Nuclear magnetic resonance imaging equipment. 5. Claims 1 or 2 or 3 or 4, wherein the air supply unit is characterized in that its air supply capacity is controlled in conjunction with the indoor air oxygen concentration meter. Nuclear magnetic resonance imaging equipment.