CN109212445B - Cooling device and cooling method for magnetic resonance imaging equipment - Google Patents
Cooling device and cooling method for magnetic resonance imaging equipment Download PDFInfo
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- CN109212445B CN109212445B CN201710527150.1A CN201710527150A CN109212445B CN 109212445 B CN109212445 B CN 109212445B CN 201710527150 A CN201710527150 A CN 201710527150A CN 109212445 B CN109212445 B CN 109212445B
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- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
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- G01R33/38—Systems for generation, homogenisation or stabilisation of the main or gradient magnetic field
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Abstract
A cooling apparatus and a cooling method for a magnetic resonance imaging apparatus including a magnet disposed in a closed space filled with a refrigerant, the cooling apparatus including a primary cooling device (10), a secondary cooling device (20), a sensor (30), and a controller (40). The controller can be used for controlling the secondary cooling device (20) to have a plurality of output powers according to the operation state and the numerical value and the variation trend of the air pressure in the closed space. When the operation state is other than the scanning state, the stage cooling device (20) is operated at a second output power lower than that when the operation state is the scanning state. The cooling device can adjust the output power of the secondary cooling device when the magnetic resonance imaging device is in a ready-to-scan state, a standby state or a power-off state. The energy consumption is saved, the service life of the secondary cooling device is prolonged, and the use cost is saved.
Description
Technical Field
The present invention relates to a cooling device, and more particularly, to a cooling device for a magnetic resonance imaging apparatus and a cooling method using the same.
Background
In the magnetic resonance imaging apparatus, when the magnet operates, a large amount of heat is generated, and in order to ensure normal operation, a Cooling system consisting of a Primary Cooling Device (PCD) such as a Cold head (Cold head) and a helium compressor, and a Secondary Cooling Device (SCD) such as a water Cooling Device is required to conduct the heat, and the Secondary Cooling Device can cool other heat generating components of the magnetic resonance imaging apparatus.
Disclosure of Invention
The invention aims to provide a cooling device of a magnetic resonance imaging device, which can solve the problems of high energy consumption of a cooling system of the magnetic resonance imaging device, short service life of a secondary cooling device and heavy use cost burden.
Another object of the present invention is to provide a cooling method for a magnetic resonance imaging apparatus, which can solve the problems of high energy consumption of a cooling system of the magnetic resonance imaging apparatus, short service life of a secondary cooling device, and heavy use cost burden by using the cooling device.
The invention provides a cooling device of a magnetic resonance imaging device, the magnetic resonance imaging device comprises a magnet, the magnet is arranged in a closed space filled with refrigerant, and the cooling device comprises a primary cooling device, a secondary cooling device, a sensor and a controller. The primary cooling device is in contact with the magnet and can cool the magnet; a secondary cooling device in contact with the primary cooling device and capable of cooling the primary cooling device, the secondary cooling device having a plurality of output powers; the sensor can detect the air pressure in the closed space; the controller can receive the value of the air pressure detected by the sensor in real time, the controller can also receive the operation state data of the magnetic resonance imaging device in real time, when the operation state is a state other than a scanning state, the primary cooling device can start or stop cooling the magnet according to the detected air pressure in the closed space, and the secondary cooling device operates at a second output power lower than a first output power output by the secondary cooling device when the operation state is the scanning state.
In a further exemplary embodiment of the cooling device of the magnetic resonance imaging apparatus, when the operating state is a state other than the scanning state, the secondary cooling device is operated at the second output power in a state where the primary cooling device is activated, and the secondary cooling device is operated at the third output power lower in power than the second output power in a state where the primary cooling device is deactivated.
In another exemplary embodiment of the cooling device of the magnetic resonance imaging apparatus, when the operation state is a state other than the scanning state, the secondary cooling device is operated at the second output power in a state where the primary cooling device is activated, and the secondary cooling device is operated at the third output power lower than the second output power in a state where the primary cooling device is deactivated, and when the air pressure in the enclosed space is within a predetermined range, where the predetermined range is that the air pressure in the enclosed space is greater than or equal to a first preset air pressure and less than a second preset air pressure.
In another exemplary embodiment of a cooling device for a magnetic resonance imaging apparatus. When the operation state is other than the scanning state, the secondary cooling device still operates at the second output power under the state that the primary cooling device stops operating and the air pressure in the closed space is out of the predetermined range.
In another exemplary embodiment of the cooling apparatus of the magnetic resonance imaging device, the states other than the scanning state include a ready-to-scan state and a standby/power-off state of the magnetic resonance imaging system.
In another exemplary embodiment of the cooling device of the magnetic resonance imaging apparatus, the secondary cooling device is capable of operating with an output power divided into a low-to-high output fully-off state, an output lower state, an output intermediate state, an output higher state, and an output fully-on state; when the state other than the scanning state is a scanning preparation state of the magnetic resonance imaging system, and the air pressure in the closed space is greater than or equal to a first preset air pressure, less than a second preset air pressure and in a rising state, controlling the secondary cooling device to operate in a lower output state; and when the air pressure in the closed space is smaller than the first preset air pressure or larger than or equal to the second preset air pressure or the air pressure in the closed space is in a reduced state, controlling the secondary cooling device to operate in a higher output state.
In another exemplary embodiment of the cooling device of the magnetic resonance imaging apparatus, the secondary cooling device is capable of operating with an output power divided into a low-to-high output fully-off state, an output lower state, an output intermediate state, an output higher state, and an output fully-on state; when the state other than the scanning state is a standby state/shutdown state, and the air pressure in the closed space is greater than or equal to a first preset air pressure, less than a second preset air pressure and in a rising state, controlling the secondary cooling device to output a full-off state for operation; and when the state other than the scanning state is a standby state/shutdown state, and the air pressure in the closed space is smaller than a first preset air pressure or larger than or equal to a second preset air pressure or is in a reduced state, controlling the secondary cooling device to operate in an output intermediate state.
The cooling device of the magnetic resonance imaging equipment provided by the invention can adjust the output power of the secondary cooling device according to the actually required cooling capacity of the primary cooling device when the magnetic resonance imaging equipment is in a state other than a scanning state. Therefore, the secondary cooling device does not continuously run in a full-load state, energy consumption can be saved, the service life of the secondary cooling device is prolonged, and the use cost is saved.
The present invention also provides a cooling method of a cooling device of a magnetic resonance imaging apparatus including a magnet disposed in a closed space filled with a refrigerant, a primary cooling device capable of cooling the magnet, and a secondary cooling device in contact with the primary cooling device and capable of cooling the primary cooling device, the secondary cooling device having a plurality of outputs, the cooling method comprising the steps of:
continuously monitoring the air pressure in the closed space;
judging the running state of the magnetic resonance imaging equipment;
and judging that the operation state is other than the scanning state, starting or stopping the primary cooling device according to the air pressure in the closed space and the operation state of the magnetic resonance imaging equipment, and simultaneously operating the secondary cooling device at a second output power lower than the first output power output by the secondary cooling device when the operation state is the scanning state.
In still another exemplary embodiment of the cooling method of a magnetic resonance imaging apparatus, the determination of the operation state is a state other than a scanning state, and the cooling method further includes:
judging that the secondary cooling device operates at a second output power when the primary cooling device is in a starting state;
it is judged that the secondary cooling device is operated at a third output power lower in power than the second output power in a state where the primary cooling device is stopped.
In still another exemplary embodiment of the cooling method of a magnetic resonance imaging apparatus, the determination of the operation state is a state other than a scanning state, and the cooling method further includes:
judging that the secondary cooling device operates at a second output power when the primary cooling device is started and the air pressure in the closed space is out of a preset range;
and when the primary cooling device stops working and the air pressure in the closed space is within a preset range, the secondary cooling device operates at a third output power with the power lower than the second output power, wherein the preset range is that the air pressure in the closed space is greater than or equal to a first preset air pressure and smaller than a second preset air pressure.
In another exemplary embodiment of the cooling method of a magnetic resonance imaging apparatus, the determination of the operating state is a state other than a scanning state, and the cooling method further includes:
and when the primary cooling device is judged to be in the state of stopping working and the air pressure in the closed space is out of the preset range, the secondary cooling device still operates at the second output power.
In another exemplary embodiment of the cooling method of a magnetic resonance imaging apparatus, the secondary cooling device is capable of operating in an output full-off state, an output low state, an output intermediate state, an output high state, and an output full-on state, in which the output power is divided from low to high, determining that the operating state is a state other than the scanning state, and the cooling method further includes:
when the state other than the scanning state is judged to be the preparation scanning state of the magnetic resonance imaging system,
when the air pressure in the closed space is greater than or equal to a first preset air pressure, less than a second preset air pressure and in a rising state, controlling the secondary cooling device to operate in a lower output state;
and controlling the secondary cooling device to operate in a higher output state when the air pressure in the closed space is judged to be smaller than the first preset air pressure or larger than or equal to the second preset air pressure or the air pressure in the closed space is in a reduced state.
In another exemplary embodiment of the cooling method of a magnetic resonance imaging apparatus, the secondary cooling device is capable of operating in an output full-off state, an output low state, an output intermediate state, an output high state, and an output full-on state, in which the output power is divided from low to high, and the operating state is determined to be a state other than the scanning state, and the cooling method further includes:
when the state other than the scanning state is judged to be a standby state/a shutdown state, and the air pressure in the closed space is more than or equal to a first preset air pressure, less than a second preset air pressure and in a rising state, controlling the secondary cooling device to output a full-off state for operation;
and judging whether the state except the scanning state is a standby state or a shutdown state, and controlling the secondary cooling device to operate in an intermediate state when the air pressure in the closed space is smaller than a first preset air pressure or larger than or equal to a second preset air pressure or is in a reduced state.
The above features, technical features, advantages and implementations of the cooling apparatus and the cooling method of the magnetic resonance imaging apparatus will be further described in the following detailed description of preferred embodiments in a clearly understandable manner with reference to the accompanying drawings.
Drawings
The following drawings are only schematic illustrations and explanations of the present invention, and do not limit the scope of the present invention.
Fig. 1 is a schematic configuration diagram for explaining an exemplary embodiment of a cooling apparatus of a magnetic resonance imaging apparatus.
Fig. 2 is a diagram for explaining the relationship between the magnetic resonance imaging apparatus and the operation state;
FIG. 3 is a diagram for explaining the relationship between the magnetic resonance imaging apparatus and the air pressure in the enclosed space in which the magnet is located;
description of the reference symbols
10 Primary cooling device
20 Secondary cooling device
30 sensor
40 controller
0 output all off state
1 output Low State
2 output intermediate state
3 output higher state
4 output full on state
P1 first preset air pressure
P2 second preset air pressure.
Detailed Description
In order to more clearly understand the technical features, objects and effects of the present invention, embodiments of the present invention will now be described with reference to the accompanying drawings, in which the same reference numerals indicate the same or structurally similar but functionally identical elements.
"exemplary" means "serving as an example, instance, or illustration" herein, and any illustration, embodiment, or steps described as "exemplary" herein should not be construed as a preferred or advantageous alternative.
Fig. 1 is a schematic configuration diagram for explaining an exemplary embodiment of a cooling apparatus of a magnetic resonance imaging apparatus including a magnet disposed in a closed space filled with a refrigerant, which may be liquid nitrogen, as shown in fig. 1, the cooling apparatus including a primary cooling device 10, a secondary cooling device 20, a sensor 30, and a controller 40. In the exemplary embodiment, the primary cooling device 10, the secondary cooling device 20, the sensor 30 and the controller 40 are arranged in the same circuit of the CANopen bus, although in other exemplary embodiments, they may be connected in other ways depending on the actual situation.
The primary cooling device 10, which is in contact with and capable of cooling the magnets, includes a cold head and a compressor. The secondary cooling device 20 is in contact with the primary cooling device 10 and is capable of cooling the primary cooling device 10, and the secondary cooling device 20 is also capable of cooling other heat generating components of the magnetic resonance imaging apparatus, such as a gradient coil, a gradient power amplifier, a radio frequency power amplifier, and the like, the secondary cooling device 20 includes a water cooling device, and the secondary cooling device 20 has a plurality of output powers. The output power of the secondary cooling device 20 is controlled mainly by means of an inverter inside the secondary cooling device 20 to output a designated step frequency to power components such as a compressor, a pump, and a fan. In the exemplary embodiment, the specific structures of the cold head, the compressor and the water cooling device are all the prior art, and are not described herein again. The sensor 30 may be a pressure sensor provided in the closed space in which the magnet is located, and may detect the air pressure in the closed space. The controller 40 can receive a value of the air pressure detected by the sensor 30 in real time, the controller 40 can receive data of an operation state of the magnetic resonance imaging apparatus in real time, and the controller 40 can control the secondary cooling device 20 according to the operation state and the value and the variation tendency of the air pressure in the enclosed space, the secondary cooling device 20 is used for cooling the primary cooling device 10 and other heat generating components and can operate at different output powers, when the operation state is a state other than a scanning state, the primary cooling device can start or stop cooling of the magnet according to the detected air pressure in the enclosed space, and the secondary cooling device 20 operates at a second output power lower than a first output power output by the secondary cooling device when the operation state is the scanning state. Since the secondary cooling device 20 has the capability of cooling the primary cooling device 10, if the cooling capability of the secondary cooling device 20 is reduced, the primary cooling device 10 may gradually lose its cooling effect because heat cannot be dissipated in a timely manner. This results in an increase in the air pressure in the closed space in which the magnet is located.
When the magnetic resonance imaging equipment is in a state other than a scanning state, the cooling device of the magnetic resonance imaging equipment can adjust the starting or stopping of the primary cooling device and the output power of the secondary cooling device according to the actually required cooling capacity of the magnetic resonance imaging equipment. Therefore, the secondary cooling device does not continuously run in a full-load state, energy consumption can be saved, the service life of the secondary cooling device is prolonged, and the use cost is saved.
In an exemplary embodiment, referring to fig. 2, when the operating state is a state other than the scanning state, as in the exemplary embodiment, the state other than the scanning state includes a Ready-to-scan state (denoted by Ready in the figure) and a standby state/Off state (denoted by standby/Off in the figure) of the magnetic resonance imaging system. In a state in which the primary cooling device 10 is activated, the secondary cooling device 20 is operated at the second output power, and in a state in which the primary cooling device 10 is deactivated, the secondary cooling device 20 is operated at a third output power having a lower power than the second output power. In the exemplary embodiment, the secondary cooling device 20 can be operated in the output power classification from low to high output fully-off state 0, output low state 1, output intermediate state 2, output high state 3, and output fully-on state 4, but is not limited thereto, and in other exemplary embodiments, more operating states with different powers can be set for the secondary cooling device 20 according to actual conditions. In the exemplary embodiment, outputting a fully-on state 4 corresponds to a first output power. The second output power and the third output power may correspond to a plurality of output powers in other states except the scanning state, for example, the second output power respectively corresponds to an output higher state 3 and an output intermediate state 2 in the ready-to-scan state and the standby state/power-off state, and for example, the third output power respectively corresponds to an output lower state 1 and an output fully-off state 0 in the ready-to-scan state and the standby state/power-off state.
Corresponding to fig. 2, in the state in which the primary cooling device 10 is activated in the preparation for the scanning state, the secondary cooling device 20 is operated in the output high state 3, and in the state in which the primary cooling device 10 is deactivated, the secondary cooling device 20 is operated in the output low state 1 in which the power is lower than that in the output high state 3. In the standby/power-off state, the heat generated by the magnetic head is lower than that in the ready-to-scan state, but the heat of the magnetic head is still conducted out in the state where the primary cooling device 10 is activated, so that the secondary cooling device 20 operates in the output intermediate state 2, and in the state where the primary cooling device 10 is deactivated, the secondary cooling device 20 operates in the output all-off state 0 with lower power than that in the output intermediate state 2.
In an exemplary embodiment, referring to fig. 3, when the operating state is a state other than the scanning state, as in the exemplary embodiment, the state other than the scanning state includes a Ready-to-scan state (denoted by Ready in the figure) and a standby state/Off state (denoted by standby/Off in the figure) of the magnetic resonance imaging system. In the state in which the primary cooling device 10 is activated, the secondary cooling device 20 is operated at a second output power, which in the exemplary embodiment is the output high state 3 and the output intermediate state 2 in the ready-to-scan state and the standby state/off state, respectively. In the state that the primary cooling device 10 stops working, and when the air pressure in the enclosed space is within the predetermined range, the secondary cooling device 20 operates at a third output power lower than the second output power, and in the exemplary embodiment, the third output power is in the output low state 1 and the output full off state 0 in the ready-to-scan state and the standby state/shutdown state, respectively, wherein the predetermined range is that the air pressure in the enclosed space is greater than or equal to a first preset air pressure P1 and less than a second preset air pressure P2. In a state where the primary cooling device 10 stops operating and the air pressure in the enclosed space is outside the predetermined range, the secondary cooling device 20 is still operated at the second output. The first preset air pressure P1 and the second preset air pressure P2 in the exemplary embodiment are set within the range of safe operation of the magnet, and may be set according to actual conditions.
In the exemplary embodiment, referring to fig. 3, when the state other than the scanning state is the ready-to-scan state of the magnetic resonance imaging system, and the air pressure in the enclosed space is greater than or equal to a first preset air pressure P1, less than a second preset air pressure P2, and in the raised state, the secondary cooling device 20 is controlled to operate in the low output state. And when the air pressure in the closed space is smaller than the first preset air pressure P1 or larger than or equal to the second preset air pressure P2 or the air pressure in the closed space is in a reduced state, controlling the secondary cooling device 20 to operate in a higher output state. When the state other than the scanning state is the standby state/shutdown state, and the air pressure in the enclosed space is greater than or equal to a first preset air pressure P1, less than a second preset air pressure P2 and in the rising state, the secondary cooling device 20 is controlled to operate in the output full-shutdown state, and when the state other than the scanning state is the standby state/shutdown state, the air pressure in the enclosed space is less than the first preset air pressure P1, greater than or equal to the second preset air pressure P2 or in the falling state, the secondary cooling device 20 is controlled to operate in the output intermediate state. In an exemplary embodiment, the controller 40 may draw an air pressure curve according to the acquired air pressure data, and determine whether the air pressure of the magnet is in the raised state according to the air pressure curve, and may also determine whether the air pressure is in the raised state by comparing the currently acquired air pressure with several previously acquired air pressures. The secondary cooling device 20 is controlled by the air pressure state in the closed space, so as to achieve a more timely and accurate cooling effect.
The present invention also provides a cooling method of a cooling device of a magnetic resonance imaging apparatus including a magnet disposed in a closed space filled with a refrigerant, a primary cooling device 10 in contact with the magnet and capable of cooling the magnet, and a secondary cooling device 20 in contact with the primary cooling device 10 and capable of cooling the primary cooling device 10, the cooling method including the step of continuously monitoring the air pressure in the closed space. The operating state of the magnetic resonance imaging device is judged. And judging that the operation state is other than the scanning state, starting or stopping the primary cooling device according to the air pressure in the closed space and the operation state of the magnetic resonance imaging equipment, and simultaneously operating the secondary cooling device at a second output power lower than the first output power output by the secondary cooling device when the operation state is the scanning state. Wherein, there is no sequence between continuously monitoring the air pressure in the closed space and judging the running state of the magnetic resonance imaging equipment.
In an exemplary embodiment, the cooling method further includes: step (c) when the primary cooling device 10 is activated, the secondary cooling device 20 is operated at the second output. It is judged that the secondary cooling device 20 is operated at the third output power lower in power than the second output power in the state where the primary cooling device 10 is stopped.
In an exemplary embodiment, the cooling method further includes: when it is judged that the primary cooling device 10 is in the activated state and the air pressure in the enclosed space is out of the predetermined range, the secondary cooling device 20 is operated at the second output power. When the primary cooling device 10 stops working and the air pressure in the enclosed space is within a predetermined range, the secondary cooling device 20 operates at a third output power lower than the second output power, wherein the predetermined range is that the air pressure in the enclosed space is greater than or equal to a first preset air pressure P1 and less than a second preset air pressure P2.
In an exemplary embodiment, the cooling method further includes: step (c), when it is determined that the primary cooling device 10 is in a stop state and the air pressure in the enclosed space is out of the predetermined range, the secondary cooling device 20 is still operated at the second output power.
In an exemplary embodiment, the states other than the scanning state include a ready-to-scan state and a standby state/power-off state of the magnetic resonance imaging system, the secondary cooling apparatus 20 is capable of operating in a low-to-high output fully-off state 0, an output low state 1, an output intermediate state 2, an output high state 3, and an output fully-on state 4 with output power, determining that the operating state is a state other than the scanning state, and the cooling method further includes: when the state other than the scanning state is determined to be the ready-to-scan state of the mri system, and the air pressure in the enclosed space is greater than or equal to a first preset air pressure P1, less than a second preset air pressure P2, and is in the raised state, the sub-cooling device 20 is controlled to output the lower state operation 1. When the air pressure in the closed space is judged to be less than the first preset air pressure P1 or more than or equal to the second preset air pressure P2 or the air pressure in the closed space is in a reduced state, the secondary cooling device 20 is controlled to output a higher state to operate 3.
In an exemplary embodiment, the cooling method further includes: when the state other than the scanning state is the standby state/the power-off state, and the air pressure in the enclosed space is greater than or equal to a first preset air pressure P1 and less than a second preset air pressure P2 and is in the rising state, the secondary cooling device 20 is controlled to output the full-off state operation 0. And judging that the state except the scanning state is a standby state/shutdown state, and controlling the secondary cooling device 20 to operate in an output intermediate state 2 when the air pressure in the closed space is smaller than a first preset air pressure P1 or larger than or equal to a second preset air pressure P2 or is in a reduced state.
It should be understood that although the present description has been described in terms of various embodiments, not every embodiment includes only a single embodiment, and such description is for clarity purposes only, and those skilled in the art will recognize that the embodiments described herein may be combined as suitable to form other embodiments, as will be appreciated by those skilled in the art.
The above-listed detailed description of a series of embodiments is merely a specific description of possible embodiments of the present invention, and they are not intended to limit the scope of the invention, and equivalent embodiments or modifications, such as combinations, divisions or repetitions of features, which do not depart from the technical spirit of the present invention, should be included in the present invention.
Claims (10)
1. A cooling apparatus for a magnetic resonance imaging apparatus including a magnet disposed in a closed space filled with a refrigerant, characterized by comprising:
a primary cooling device (10) capable of cooling said magnets;
a secondary cooling device (20) in contact with the primary cooling device (10) and capable of cooling the primary cooling device (10), the secondary cooling device (20) having a plurality of outputs,
a sensor (30) capable of detecting the air pressure within the enclosed space;
a controller (40) capable of receiving the value of the air pressure detected by the sensor (30), the controller (40) being further capable of receiving data of the operating state of the magnetic resonance imaging apparatus, and
when the operation state is a state other than the scanning state, the primary cooling device is capable of starting or stopping cooling of the magnet in accordance with the detected air pressure in the enclosed space, and the secondary cooling device (20) is operated at a second output power lower than a first output power output by the secondary cooling device when the operation state is the scanning state,
the secondary cooling device (20) can be operated in a low-to-high output fully-off state (0), a low-output state (1), an intermediate output state (2), a high-output state (3) and a fully-output-on state (4) according to the output power;
when the state except the scanning state is a scanning preparation state of the magnetic resonance imaging system, and the air pressure in the closed space is greater than or equal to a first preset air pressure (P1), less than a second preset air pressure (P2) and in a rising state, controlling the secondary cooling device (20) to output a lower state (1) for operation;
and when the state except the scanning state is a preparation scanning state of the magnetic resonance imaging system, and the air pressure in the closed space is smaller than the first preset air pressure (P1) or larger than or equal to the second preset air pressure (P2) or is in a reduced state, controlling the secondary cooling device (20) to operate in a higher output state (3).
2. A cooling apparatus for a magnetic resonance imaging apparatus including a magnet disposed in a closed space filled with a refrigerant, characterized by comprising:
a primary cooling device (10) capable of cooling said magnets;
a secondary cooling device (20) in contact with the primary cooling device (10) and capable of cooling the primary cooling device (10), the secondary cooling device (20) having a plurality of outputs,
a sensor (30) capable of detecting the air pressure within the enclosed space;
a controller (40) capable of receiving the value of the air pressure detected by the sensor (30), the controller (40) being further capable of receiving data of the operating state of the magnetic resonance imaging apparatus, and
when the operation state is a state other than the scanning state, the primary cooling device can start or stop cooling the magnet according to the detected air pressure in the closed space, the secondary cooling device (20) operates at a second output power lower than a first output power output by the secondary cooling device when the operation state is the scanning state, and the secondary cooling device (20) can operate in an output full-off state (0), an output low state (1), an output intermediate state (2), an output high state (3) and an output full-on state (4) with output power divided into a low output state, a high output state (1), an output intermediate state (2) and an output full-on state;
when the state other than the scanning state is a standby state/shutdown state, and the air pressure in the closed space is greater than or equal to a first preset air pressure (P1), less than a second preset air pressure (P2) and in a rising state, controlling the secondary cooling device (20) to output a full-shutdown state (0) for operation,
and when the state except the scanning state is a standby state/shutdown state, and the air pressure in the closed space is smaller than the first preset air pressure (P1) or larger than or equal to the second preset air pressure (P2) or is in a reduced state, controlling the secondary cooling device (20) to output an intermediate state (2) for operation.
3. The cooling apparatus according to claim 1 or 2,
when the operation state is a state other than the scanning state, the secondary cooling device (20) is operated at the second output power in a state where the primary cooling device (10) is activated, and the secondary cooling device (20) is operated at a third output power lower in power than the second output power in a state where the primary cooling device (10) is deactivated.
4. The cooling apparatus according to claim 1 or 2,
when the operation state is a state other than the scanning state, the secondary cooling device (20) operates at the second output power in a state where the primary cooling device (10) is activated, and the secondary cooling device (20) operates at a third output power lower in power than the second output power in a state where the primary cooling device (10) is deactivated and an air pressure in the enclosed space is within a predetermined range, wherein the predetermined range is that the air pressure in the enclosed space is equal to or higher than a first preset air pressure (P1) and lower than a second preset air pressure (P2).
5. The cooling apparatus according to claim 4,
when the operation state is other than the scanning state, the secondary cooling device (20) still operates at the second output power when the primary cooling device (10) stops operating and the air pressure in the closed space is outside the predetermined range.
6. A cooling method of a magnetic resonance imaging apparatus including a magnet disposed in a closed space filled with a refrigerant, a primary cooling device (10) capable of cooling the magnet, and a secondary cooling device (20) in contact with the primary cooling device (10) and capable of cooling the primary cooling device (10), the secondary cooling device (20) having a plurality of output powers, the cooling method comprising:
continuously monitoring the air pressure in the enclosed space;
judging the running state of the magnetic resonance imaging equipment;
judging that the operation state is other than the scanning state, starting or stopping the primary cooling device according to the air pressure in the closed space and the operation state of the magnetic resonance imaging equipment, and simultaneously operating the secondary cooling device at a second output power lower than the first output power output by the secondary cooling device when the operation state is the scanning state,
the secondary cooling device (20) can be divided into an output full-off state (0), an output low state (1), an output intermediate state (2), an output high state (3) and an output full-on state (4) which are from low to high by output power, and the operation state is judged to be a state other than a scanning state, and the cooling method further comprises the following steps:
when the state except the scanning state is judged to be a scanning preparation state of the magnetic resonance imaging system, and the air pressure in the closed space is more than or equal to a first preset air pressure (P1), less than a second preset air pressure (P2) and in a rising state, controlling the secondary cooling device (20) to output a lower state (1) to operate;
and when the state except the scanning state is judged to be a preparation scanning state of the magnetic resonance imaging system, and the air pressure in the closed space is smaller than the first preset air pressure (P1) or larger than or equal to the second preset air pressure (P2) or is in a reduced state, controlling the secondary cooling device (20) to operate in a higher output state (3).
7. A cooling method of a magnetic resonance imaging apparatus including a magnet disposed in a closed space filled with a refrigerant, a primary cooling device (10) capable of cooling the magnet, and a secondary cooling device (20) in contact with the primary cooling device (10) and capable of cooling the primary cooling device (10), the secondary cooling device (20) having a plurality of output powers, the cooling method comprising:
continuously monitoring the air pressure in the enclosed space;
judging the running state of the magnetic resonance imaging equipment;
judging that the operation state is other than the scanning state, starting or stopping the primary cooling device according to the air pressure in the closed space and the operation state of the magnetic resonance imaging equipment, and simultaneously operating the secondary cooling device at a second output power lower than the first output power output by the secondary cooling device when the operation state is the scanning state,
the secondary cooling device (20) can be divided into an output full-off state (0), an output low state (1), an output intermediate state (2), an output high state (3) and an output full-on state (4) which are from low to high by output power, and the operation state is judged to be a state other than a scanning state, and the cooling method further comprises the following steps:
when the state except the scanning state is judged to be a standby state/shutdown state, and the air pressure in the closed space is more than or equal to a first preset air pressure (P1), less than a second preset air pressure (P2) and in a rising state, controlling the secondary cooling device (20) to output a full-shutdown state (0) for operation;
and judging whether the state except the scanning state is a standby state or a shutdown state, and controlling the secondary cooling device (20) to operate in an output intermediate state (2) when the air pressure in the closed space is smaller than the first preset air pressure (P1), larger than or equal to the second preset air pressure (P2) or in a reduced state.
8. The cooling method according to claim 6 or 7, wherein it is judged that the operation state is a state other than the scanning state, and the cooling method further comprises:
determining that the secondary cooling device (20) is operated at the second output power in a state where the primary cooling device (10) is activated;
it is judged that the secondary cooling device (20) is operated at a third output power lower in power than the second output power in a state where the primary cooling device (10) stops operating.
9. The cooling method according to claim 6 or 7, wherein it is judged that the operation state is a state other than the scanning state, and the cooling method further comprises:
judging that the secondary cooling device (20) operates at the second output power under the condition that the primary cooling device (10) is started; and when the primary cooling device (10) is judged to be in a state of stopping working and the air pressure in the closed space is in a preset range, the secondary cooling device (20) operates at a third output power lower than the second output power, wherein the preset range is that the air pressure in the closed space is greater than or equal to a first preset air pressure (P1) and smaller than a second preset air pressure (P2).
10. The cooling method according to claim 9, wherein it is judged that the operation state is a state other than a scanning state, the cooling method further comprising:
and when the primary cooling device (10) is judged to be in a state of stopping working and the air pressure in the closed space is out of the preset range, the secondary cooling device (20) still operates at the second output power.
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| JP2004047713A (en) * | 2002-07-11 | 2004-02-12 | Sumitomo Heavy Ind Ltd | Superconducting magnet device |
| GB2453721B (en) * | 2007-10-15 | 2010-11-17 | Siemens Magnet Technology Ltd | Helium compressor with control for reduced power consumption |
| GB2455737B (en) * | 2007-12-19 | 2010-08-11 | Siemens Magnet Technology Ltd | Variable charge compressor |
| CN101498770B (en) * | 2008-01-29 | 2012-06-27 | 西门子（中国）有限公司 | Method and apparatus for cooling magnetic resonance imaging system |
| CN104676994A (en) * | 2013-11-29 | 2015-06-03 | 西门子(深圳)磁共振有限公司 | Cooling device and method for magnetic resonance imaging system |
| CN105982673B (en) * | 2015-01-30 | 2020-09-29 | 西门子(深圳)磁共振有限公司 | Cooling method of magnetic resonance imaging device and magnetic resonance imaging device |
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