JP7177319B2 - Subject warming device for magnetic resonance imaging device - Google Patents

Description

The present invention relates to a subject heat retaining device for a magnetic resonance imaging apparatus.

2. Description of the Related Art A magnetic resonance imaging apparatus (hereinafter, also referred to as an "MRI apparatus") that images an object, which is an animal, is known (see Patent Document 1, for example).
When an animal is imaged by such an MRI apparatus, general anesthesia is generally administered so that the animal does not move during imaging.

Japanese Unexamined Patent Application Publication No. 2017-205148

When an animal is under general anesthesia, it is inevitable that the body temperature will drop. In particular, since the MRI apparatus takes a long time for examination, the hypothermia state of the animal prolongs, which increases the risk of death, complications, and the like.
Conventionally, when an animal wakes up from general anesthesia after imaging by an MRI apparatus, a hot water bottle or the like is immediately used to help the animal recover its body temperature.

However, the conventional MRI apparatus only assists the animal in recovering its body temperature when awakened from general anesthesia, and does not take any particular measures against the decrease in body temperature during imaging. For this reason, the risk of death, complications, and the like due to a drop in the animal's body temperature due to general anesthesia during imaging has not yet been reduced.

Accordingly, an object of the present invention is to suppress a decrease in body temperature of an animal caused by general anesthesia during imaging by an MRI apparatus.

In order to solve the above-described problems, a subject heat retaining device for a magnetic resonance imaging apparatus according to the present invention includes a hollow heat retaining mat on which an animal subject is placed. The heat insulating mat is arranged radially inside the cylindrical high-frequency coil in the magnetic resonance imaging apparatus. Further, the subject heat retaining device for a magnetic resonance imaging apparatus includes a warm air generating section for generating hot air to be supplied to the inside of the heat retaining mat, and an introduction unit for sending the warm air from the hot air generating section to the heat retaining mat. A duct, temperature detecting means for detecting the body temperature of the subject, and control means for controlling the operation of the hot air generating section so that the detected value of the temperature detecting means is kept within a predetermined range . The animal is a small animal including dogs and cats that can be treated at a veterinary clinic. The heat insulating mat is made of hard resin and has an arcuate surface as a whole.

INDUSTRIAL APPLICABILITY The present invention can suppress hypothermia of an animal caused by general anesthesia during imaging by an MRI apparatus.

1 is a diagram showing a schematic configuration of a magnetic resonance imaging apparatus equipped with a subject heat retaining device for a magnetic resonance imaging apparatus according to an embodiment of the present invention; FIG. 2 is a left side view of the magnetic resonance imaging apparatus shown in FIG. 1; FIG. FIG. 2 is a perspective view showing the high-frequency coil, the mounting table, and the heat insulating mat shown in FIG. 1; FIG. 4(a) is a plan development cross-sectional view of the heat insulating mat, and is a cross-sectional view taken along line BB in FIG. 4(b). FIG. 4(b) is a right side view of the heat insulating mat. FIG. 5(a) is a plan development cross-sectional view of a heat insulating mat 81 according to a modification. FIG. 5(b) is a cross-sectional view taken along line CC of FIG. 5(a). FIG. 4 is a schematic diagram showing an introduction duct covered with a heat insulating material; FIG. 4 is a perspective view showing a heat insulating mat according to another embodiment of the present invention together with a high frequency coil and a mounting table; FIG. 10 is a plan development cross-sectional view of a heat insulating mat according to still another embodiment of the present invention; FIG. 10 is a left view of a heat insulating mat according to still another embodiment of the present invention;

Embodiments of the present invention will be described in detail with reference to the drawings as appropriate.
In addition, in each figure, the same code|symbol is attached|subjected about a common component and a similar component, and those overlapping description is abbreviate|omitted suitably.

FIG. 1 is a diagram showing a schematic configuration of an MRI apparatus 100 equipped with a subject heat retention device for a magnetic resonance imaging apparatus (hereinafter also simply referred to as "subject heat retention device") 7 according to one embodiment of the present invention. . FIG. 2 is a left side view of the MRI apparatus 100 shown in FIG. 1. FIG.
In this embodiment, a subject heat retaining device 7 used in an MRI apparatus 100 for imaging a subject A, which is an animal, will be described. The animals here are small animals such as dogs and cats that can be treated at animal hospitals.

As shown in FIG. 1, the MRI apparatus 100 includes a gantry 1, a high frequency coil 3, a control unit 5, and a console 6. The gantry 1 is formed with openings 11 that open forward and to the left and right sides. The high-frequency coil 3 is arranged in the opening 11 of the gantry 1 and has a tubular shape. A control unit 5 controls the operation of the gantry 1 . The console 6 has a computer 61 and a display section 62 . The computer 61 sets imaging conditions and reconstructs a magnetic resonance image. The display unit 62 displays an imaging condition setting operation screen, a magnetic resonance image, and the like.

The gantry 1 includes gradient magnetic field generating coils 12 and static magnetic field generating magnets 13 which are permanent magnets, for example. A static magnetic field is generated in the opening 11 by the static magnetic field generating magnet 13 , and a gradient magnetic field is generated in the opening 11 by the gradient magnetic field generating coil 12 . The gradient magnetic field generating coil 12 is connected to the control unit 5 through a cable assembly 14 via a noise filter (not shown).

The high-frequency coil 3 irradiates the subject A with high-frequency pulses and detects a nuclear magnetic resonance signal (hereinafter also referred to as "NMR signal") from the subject A. The high frequency coil 3 is connected to the control unit 5 through a cable assembly 14 via a noise filter (not shown). The cable assembly 14 includes a static magnetic field generation power supply cable, a high frequency pulse irradiation cable, and a high frequency signal detection cable.

As shown in FIG. 2, the high-frequency coil 3 can be configured in various forms according to the shape of the subject A and the like. Here, as an example of the high-frequency coil 3, a cylindrical one is used. That is, the high-frequency coil 3 is formed with a hole portion 31 having a circular cross section penetrating in the left-right direction. A subject A is inserted through the hole 31 of the high-frequency coil 3 . Then, the MRI apparatus 100 can capture an image of the part placed inside the high-frequency coil 3 . The high-frequency coil 3 may be configured such that the cylindrical shape is divided into semicircles and the halves are faced vertically so that they can be assembled and separated.

As shown in FIG. 1, the MRI apparatus 100 amplifies the NMR signal detected from the subject A by the high-frequency coil 3 with a preamplifier (not shown), further amplifies and AD-converts it with the control unit 5, and then transmits it to the computer 61. Forward. The computer 61 performs processing such as Fourier transform on the data amplified and AD-converted by the control unit 5 to reconstruct an image of the subject A and causes the display unit 62 to display the image.

The MRI apparatus 100 displays a graphical user interface screen (GUI screen) on the display unit 62 by the computer 61 . The computer 61 sends commands to the control unit 5 according to imaging conditions set by an operator (not shown). The control unit 5 drives the gradient magnetic field generating coil 12 and the high frequency coil 3 according to instructions from the computer 61 .

The MRI apparatus 100 is equipped with a subject heat retaining device 7 . The subject heat-retaining device 7 includes a heat-retaining mat 71 , a hot air generator 90 , and an introduction duct 95 .

The heat insulating mat 71 is a hollow mat arranged radially inside the tubular high-frequency coil 3 in the MRI apparatus 100 . A subject A, which is an animal, is placed on the heat insulating mat 71 . The hot air generator 90 generates hot air to be supplied inside the heat insulating mat 71 . The introduction duct 95 sends hot air from the hot air generating section 90 to the heat insulating mat 71 .

In this embodiment, the subject temperature-retaining device 7 includes a mounting table 4 arranged radially inside the high-frequency coil 3 . The heat insulating mat 71 is detachably arranged on the mounting table 4 . That is, the mounting table 4 is a table for mounting the subject A via the heat insulating mat 71 . The mounting table 4 is arranged movably on the upper surface 21 a of the top plate 21 of the table 2 .

A high-frequency coil 3 is arranged on the upper surface 21 a of the top plate 21 of the table 2 . The high-frequency coil 3 is detachably attached to the upper surface 21a of the top plate 21 of the table 2. As shown in FIG. A plurality of high-frequency coils 3 having different sizes of the hole portions 31 are prepared, and the high-frequency coil 3 is selected according to the size of the subject A. FIG.

The table 2 includes a rectangular top plate 21 and front, rear, left, and right legs 22 supporting the top plate 21 . Wheels 23 are attached to the lower ends of the front, rear, left, and right legs 22, respectively. Thereby, the table 2 is movable in the front-rear direction. By moving the table 2 arranged in front of the MRI apparatus 100 toward the rear, the central portion of the tabletop 21 in the horizontal direction can be inserted into the opening 11 .

The mounting table 4 includes a bed portion 41 extending in the left-right direction, and front, rear, left, and right leg portions 42 supporting the bed portion 41 . An upper surface 41a of the bed portion 41 is recessed in a concave shape so that an axis-perpendicular cross section has a substantially semicircular shape. A plurality of mounting tables 4 having different shapes and sizes of the bed part 41 are prepared, and the mounting table 4 is selected according to the size of the subject A. FIG.

Wheels 43 are attached to the lower end portions of the front, rear, left, and right leg portions 42 . As a result, the mounting table 4 can be moved in the horizontal direction by being manually pushed and pulled by the operator. The mounting table 4 is inserted through the hole 31 of the high-frequency coil 3 in the left-right direction. The height of the leg portion 42 and the outer diameter of the bed portion 41 are set so that the outer surface of the bed portion 41 of the mounting table 4 does not contact the inner peripheral surface of the hole portion 31 of the high-frequency coil 3 . The mounting table 4 is movable in the left-right direction while being inserted into the hole 31 of the high-frequency coil 3 .

FIG. 3 is a perspective view showing the high frequency coil 3, the mounting table 4, and the heat insulating mat 71 shown in FIG. FIG. 4(a) is a plan development cross-sectional view of the heat insulating mat 71, and is a cross-sectional view taken along line BB in FIG. 4(b). 4B is a right side view of the heat insulating mat 71. FIG.

As shown in FIGS. 3 and 4, the lower surface 71a of the heat insulating mat 71 is formed to have a substantially semicircular cross-section perpendicular to the axis, and has an arcuate surface having substantially the same diameter as the upper surface 41a of the bed portion 41. ing. As a result, the heat insulating mat 71 can be stably placed on the upper surface 41a of the bed portion 41 of the mounting table 4 without backlash. Further, the upper surface 71b of the heat insulating mat 71 is also formed so that the cross section perpendicular to the axis has a substantially semicircular shape. That is, the heat-retaining mat 71 as a whole has a generally arcuate surface. By forming the upper surface 71 b of the heat insulating mat 71 in a concave shape in this way, the subject A can be stably placed on the upper surface 71 b of the heat insulating mat 71 .

A passage 72 through which warm air passes is formed inside the heat insulating mat 71 . The thickness dimension (thickness of the air layer) of the passage 72 in the thickness direction of the heat insulating mat 71 is preferably about 1 to 2 cm from the viewpoint of securing the heat insulating effect while suppressing the space occupied by the heat insulating mat 71 .

The heat insulating mat 71 has an inlet 73 to which the introduction duct 95 is connected, and an outlet 74 through which hot air flowing in from the inlet 73 flows out. A partition wall 75 extending in the longitudinal direction of the heat insulating mat 71 is formed inside the heat insulating mat 71 . By providing the partition wall 75 , the passage 72 formed inside the heat insulating mat 71 meanders and connects the inlet 73 and the outlet 74 .

The number of installed partition walls 75 and the number of meandering passages 72 (the number of reciprocations in the left-right direction) can be arbitrarily set. Moreover, although both the inlet 73 and the outlet 74 are provided at one end in the longitudinal direction (horizontal direction) of the heat insulating mat 71 here, they may be provided at both ends in the longitudinal direction. Moreover, although the partition wall 75 is installed along the longitudinal direction here, it is not limited to this, and may be installed along a direction orthogonal to the longitudinal direction, for example. Alternatively, if a predetermined rigidity can be secured in the heat insulating mat 71, installation of the partition wall 75 can be omitted.

FIG. 5(a) is a plan development cross-sectional view of a heat insulating mat 81 according to a modification. FIG. 5(b) is a cross-sectional view taken along line CC of FIG. 5(a).
In the above example shown in FIGS. 4(a) and 4(b), the passage 72 inside the heat insulating mat 71 meanders and connects the inlet 73 and the outlet 74, but as shown in FIGS. 5(a) and 5(b). Alternatively, a heat insulating mat 81 may be configured. That is, the passage 72 inside the heat insulating mat 81 may go straight to communicate the inlet 73 and the outlet 74 . In this case, an inlet 73 and an outlet 74 are provided at both ends of the heat insulating mat 71 in the longitudinal direction. Further, a partition wall 75 is formed so that hot air flows directly from the inlet 73 to the outlet 74 inside the heat insulating mat 81 . Since the warm air flows straight (directly) in this simple manner, the warm air can flow efficiently and the temperature of the heat insulating mat can be maintained at a high temperature.

The heat insulating mat 71 is made of a hard resin such as acrylic or polyethylene, not a soft material, so that when the subject A is placed thereon, the subject A does not move during imaging due to, for example, changes in the pressure of hot air. It is considered a hollow mat. The hardness of the hard resin is, for example, 55 to 125 (HRM) in terms of Rockwell hardness.

Further, as shown in FIG. 1, the subject heat retaining device 7 has temperature detection means 91 for detecting the body temperature of the subject A. As shown in FIG. The temperature detecting means 91 is a thermometer using a thermistor here, and is used by being inserted into the anus of the subject A, for example. However, the temperature detection means 91 is not limited to this, and may detect the body temperature of the subject A by detecting infrared rays emitted from the subject A, for example. Also, the temperature detection means 91 may detect the temperature of the heat insulating mat 71 in contact with the subject A instead of the body temperature of the subject A. FIG. The temperature detection means 91 is connected to the computer 61 so that the detected value of the temperature detection means 91 is sent to the computer 61 . The detected value of the temperature detection means 91 is configured to be displayed on the display unit 62 of the console 6, but is not limited to this, and can be displayed on the display unit of a mobile terminal such as a smartphone or a notebook computer. may be displayed.

The hot air generator 90 is configured here with an electric heater and a blower fan. However, the hot air generator 90 is not limited to this, and may be equipped with a heat pump device, for example. The hot air generator 90 is connected to the end of the introduction duct 95 opposite to the heat insulating mat 71 . The hot air generator 90 is preferably arranged outside an imaging room (shielded room) in which imaging is performed by the MRI apparatus 100 . As a result, the influence of noise and the like can be suppressed as much as possible. Further, by separating the heat source from the imaging room, temperature fluctuations in the imaging room can be suppressed.

As the introduction duct 95, for example, a bellows hose made of resin can be used. As shown in FIG. 6, the introduction duct 95 may be covered with a heat insulating material 97 by, for example, wrapping the heat insulating material 97 around the introduction duct 95 . In this way, heat radiation from the introduction duct 95 can be suppressed. Note that the introduction duct 95 itself may be made of a material that does not easily dissipate heat.

A computer (control means) 61 controls the operation of the hot air generator 90 so that the detected value of the temperature detection means 91 is kept within a predetermined range. Specifically, when the detected value of the temperature detecting means 91 becomes smaller than a predetermined lower limit value, the computer 61 increases the output of the warm air generating section 90 . Further, when the detected value of the temperature detecting means 91 becomes larger than the predetermined upper limit value, the computer 61 reduces the output of the warm air generating section 90 . Feedback control such as PID control may be used as a control method for keeping the temperature within a predetermined range.

Next, a procedure for imaging the subject A by the MRI apparatus 100 equipped with the subject warming device 7 according to the present embodiment will be described.

First, the table 2 is arranged in front of the gantry 1 shown in FIG. A high-frequency coil 3 is fixedly arranged on the table 2, and a mounting table 4 is arranged so as to be freely movable in the horizontal direction. Here, the mounting table 4 is arranged radially inside the high-frequency coil 3, as shown in FIG. A heat insulating mat 71 is arranged on the mounting table 4 .

Subsequently, the computer 61 starts operating the warm air generating section 90 with a predetermined initial output. The hot air generated by the hot air generator 90 is sent to the inside of the heat insulating mat 71 through the introduction duct 95 . Then, the subject A, who has been given general anesthesia, is placed on the upper surface 71b of the heat-retaining mat 71, for example, in a supine state. As a result, the subject A is inserted into the high-frequency coil 3 .

Subsequently, the table 2 is moved backward, and the subject A and the high-frequency coil 3 are arranged in the opening 11 of the MRI apparatus 100 . At this time, the high frequency coil 3 is placed in the center of the static magnetic field. Then, the imaging region of the subject A is placed in the hole 31 of the high-frequency coil 3, and imaging is performed by the MRI apparatus 100. FIG. During imaging by the MRI apparatus 100, the operation of the warm air generator 90 is controlled to keep the detection value of the temperature detection means 91 within a predetermined range. Further, by moving the mounting table 4 in the left-right direction within the hole 31 of the high-frequency coil 3, the imaging area of the subject A can be changed.

As described above, the subject heat retaining device 7 mounted on the MRI apparatus 100 is arranged radially inside the tubular high-frequency coil 3 in the MRI apparatus 100, and is a hollow hollow body on which the subject A, which is an animal, is placed. A heat insulating mat 71 is provided. In addition, the subject heat retaining device 7 includes a hot air generating section 90 that generates hot air to be supplied to the inside of the heat retaining mat 71 , and an introduction duct 95 that sends the hot air from the hot air generating section 90 to the heat retaining mat 71 . Prepare.

With this configuration, hot air can be supplied to the inside of the heat insulating mat 71 on which the subject A, which is an animal, is placed during imaging by the MRI apparatus 100 . As a result, heat from the warm air is transferred to the animal through the heat insulating mat 71 .
Therefore, the subject heat retaining device 7 according to the present embodiment can suppress a decrease in body temperature of an animal caused by general anesthesia during imaging by the MRI apparatus 100 . Therefore, the risk of death or complications due to a drop in body temperature of the animal due to general anesthesia during imaging is reduced.
In addition, if warm water is supplied to the inside of the heat insulating mat 71, the moisture will appear in the MRI image. nothing to put in. In other words, no unnecessary objects appear in the MRI image and become artifacts.

Further, in this embodiment, since the heat-retaining mat 71 is made of hard resin, even if an animal is placed on the heat-retaining mat 71, the heat-retaining mat 71 hardly deforms such as a dent. As a result, it is possible to suppress movement of the subject A, which is an animal, during imaging due to, for example, changes in the wind pressure of warm air, and accurate imaging is possible. In addition, since the heat insulating mat 71 is made of resin, it does not disturb the magnetic field, so that it does not become a metal artifact.

Further, in this embodiment, the operation of the warm air generator 90 is controlled so that the detected value of the temperature detection means 91 for detecting the body temperature of the subject A is kept within a predetermined range. As a result, it is possible to efficiently and reliably suppress the decrease in body temperature of the animal. In addition, it is possible to prevent the temperature in the imaging room where imaging is performed by the MRI apparatus 100 from fluctuating due to the heat of the heat insulating mat 71 . This enables more accurate imaging.

Further, in the present embodiment, the operation of the warm air generating section 90 may be controlled so that the detected value of the temperature detecting means 91 for detecting the temperature of the heat insulating mat 71 is kept within a predetermined range. If it takes time to detect the body temperature of the animal, monitoring and controlling the temperature change of the heat insulating mat 71 can stably maintain the body temperature of the animal. As a result, it is possible to efficiently and reliably suppress the decrease in body temperature of the animal. In addition, it is possible to prevent the temperature in the imaging room where imaging is performed by the MRI apparatus 100 from fluctuating due to the heat of the heat insulating mat 71 . This enables more accurate imaging.

Further, in this embodiment, the detected value of the temperature detection means 91 is displayed on the display section 62 . This allows the operator to visually confirm the body temperature of the animal.

Further, this embodiment includes a mounting table 4 arranged inside the high-frequency coil 3 , and the heat insulating mat 71 is detachably arranged on the mounting table 4 . As a result, the heat insulating mat 71 can be reliably arranged radially inside the high frequency coil 3 with a simple configuration.

In this embodiment, the heat insulating mat 71 includes an inlet 73 to which the introduction duct 95 is connected, an outlet 74 through which hot air flowing in from the inlet 73 flows out, and a passage 72 that communicates the inlet 73 and the outlet 74. have. In this configuration, warm air flows inside the heat-retaining mat 71 through the passage 72, so that the heat generated by the warm air can be efficiently transmitted to the animal through the heat-retaining mat 71. - 特許庁

Further, in this embodiment, the passage 72 communicates the inlet 73 and the outlet 74 inside the heat insulating mat 71 by means of a partition wall 75 provided so as to partition the inside of the heat insulating mat 71 . The formation of the partition wall 75 improves the rigidity of the heat-retaining mat 71, so that movement of the subject A, which is an animal, during imaging can be further suppressed.

FIG. 7 is a perspective view showing a heat insulating mat 85 according to another embodiment of the present invention together with the high frequency coil 3 and the mounting table 4. As shown in FIG. This embodiment differs from the above-described embodiment in which a heat insulating mat 85 is shown in FIGS. 1-4.

A heat insulating mat 85 shown in FIG. 7 is different from the heat insulating mat 71 shown in FIG. . Other configurations are the same as those of the embodiment described above. The heat insulating mat 85 may be, for example, a resin product integrally molded with the mounting table 4 . With such a configuration, the number of parts can be reduced, and the trouble of setting the heat insulating mat on the mounting table 4 can be saved, so that efficient imaging can be performed.

FIG. 8 is a plan development cross-sectional view of heat insulating mats 71 and 85 according to still another embodiment of the present invention. This embodiment differs from the above-described embodiment shown in FIGS. is different from Other configurations are the same as those of the embodiment described above. With this configuration, it is possible to prevent the temperature in the imaging room where imaging is performed by the MRI apparatus 100 from fluctuating due to the heat of the warm air emitted from the heat insulating mat 71 . This enables more accurate imaging.

Although the heat-retaining mat 71 is made of hard resin in the above embodiment, the heat-retaining mat 82 may be made of soft resin such as polyvinyl chloride as shown in FIG. Inside the hollow heat-retaining mat 82 , a corrugated plate 83 formed in a corrugated shape is provided between the upper wall and the lower wall of the heat-retaining mat 82 . Such a heat-retaining mat 82 can be improved in rigidity by the corrugated plate 83 , and even if the subject A, who is an animal, is placed on the heat-retaining mat 82 , the heat-retaining mat 82 will not be crushed. In this case, the space inside the heat insulating mat 82 except for the corrugated plate 83 serves as a path for hot air. In the example of FIG. 9, the warm air flows along the longitudinal direction of the heat insulating mat 82, for example, from the front side to the depth direction.

Although the present invention has been described above based on the embodiments, the present invention is not limited to the configurations described in the above embodiments. The configuration of the present invention can be changed as appropriate without departing from the gist of the invention, including appropriate combinations or selections of the configurations described in the above embodiments. In addition, addition, deletion, and replacement can be made for a part of the configuration of the above embodiment.

For example, in the above-described embodiment, the heat-retaining mat 71 as a whole is formed to have a generally arcuate surface, but it is not limited to this. The shape of the heat-retaining mat 71 may be any shape as long as the subject A, which is an animal, can be placed thereon, and can be changed as appropriate.

In addition, although the heat insulating mat 71 is made of resin in the above embodiment, it is not limited to this. The heat-retaining mat 71 may be made of any material that has sufficient rigidity to suppress movement of the animal during imaging and that does not cause artifacts. For example, it may be a non-magnetic stainless steel alloy.

In the above-described embodiment, the mounting table 4 is arranged on the top surface 21a of the top plate 21 of the table 2 so as to be manually movable. may be placed. Alternatively, the mounting table 4 may be fixed on the upper surface 21 a of the top plate 21 of the table 2 and configured to be movable together with the table 2 .

Further, in the above-described embodiment, the operation of the hot air generating section 90 is automatically controlled so that the detected value of the temperature detecting means 91 for detecting the body temperature of the subject A is kept within a predetermined range. not to be For example, the operator may manually adjust the output of the warm air generating section 90 while visually confirming the body temperature of, for example, an animal displayed on the display section 62 .

3 high-frequency coil 4 mounting table 6 console 61 computer (control means)
62 display section 7 subject heat retaining device 71, 81, 82, 85 heat retaining mat 72 passage 73 inlet 74 outlet 90 hot air generating section 91 temperature detection means 95 introduction duct 96 discharge duct 100 MRI apparatus A subject

Claims (8)

a hollow heat-retaining mat placed radially inside a cylindrical high-frequency coil in a magnetic resonance imaging apparatus and on which an animal subject is placed;
a hot air generating unit for generating hot air to be supplied to the inside of the heat insulating mat;
an introduction duct for sending hot air from the hot air generating unit to the heat insulating mat;
temperature detection means for detecting the body temperature of the subject;
a control means for controlling the operation of the hot air generating section so that the detected value of the temperature detecting means is kept within a predetermined range;
with
The animal is a small animal including dogs and cats that can be treated at a veterinary hospital,
A subject heat retaining device for a magnetic resonance imaging apparatus, wherein the heat retaining mat is made of a hard resin and presents an arcuate surface as a whole. 2. A subject temperature-retaining apparatus for a magnetic resonance imaging apparatus according to claim 1 , further comprising a display section for displaying the detected value of said temperature detecting means. A mounting table arranged radially inside the high-frequency coil,
3. A subject warming apparatus for a magnetic resonance imaging apparatus according to claim 1, wherein said heat insulating mat is detachably arranged on said mounting table. A mounting table arranged radially inside the high-frequency coil,
3. A subject heat retaining device for a magnetic resonance imaging apparatus according to claim 1, wherein said heat retaining mat is provided integrally with the upper surface of said mounting table. The heat insulating mat
an inlet to which the introduction duct is connected;
an outlet through which hot air flowing in from the inlet flows out;
5. The subject for a magnetic resonance imaging apparatus according to any one of claims 1 to 4 , further comprising a passage formed inside said heat insulating mat and communicating said inlet and said outlet. Keep warm device. 6. A magnetic resonance imaging apparatus according to claim 5 , wherein said passage communicates said inlet and said outlet inside said heat insulating mat with a partition wall provided so as to partition the inside of said heat insulating mat. for subject warming device. The hot air generating unit is arranged outside an imaging room in which imaging is performed by the magnetic resonance imaging apparatus,
7. The object heat retaining device for a magnetic resonance imaging apparatus according to claim 5 , wherein said introduction duct connects said inlet and said hot air generating section. 8. The magnetic resonance imaging apparatus according to any one of claims 5 to 7 , further comprising an ejection duct that connects the outlet and an exterior of an imaging room in which imaging is performed by the magnetic resonance imaging apparatus. for subject warming device.

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