CN213482437U - Gradient coil assembly and magnetic resonance equipment - Google Patents
Gradient coil assembly and magnetic resonance equipment Download PDFInfo
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- CN213482437U CN213482437U CN202021979510.5U CN202021979510U CN213482437U CN 213482437 U CN213482437 U CN 213482437U CN 202021979510 U CN202021979510 U CN 202021979510U CN 213482437 U CN213482437 U CN 213482437U
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Abstract
The utility model provides a gradient coil assembly and magnetic resonance equipment. The gradient coil assembly includes: a gradient coil for generating a gradient field; shim assemblies disposed along a peripheral side of the gradient coil; and a heating assembly disposed on a peripheral side of the shim assembly, the heating assembly being thermally coupled to the shim assembly. Through the cooperation of shimming subassembly, heating element and gradient coil for the temperature of shimming subassembly is stable at fixed range, guarantees the temperature stability of shimming subassembly, reduces the field of shimming subassembly and floats, and then guarantees the imaging effect when magnetic resonance equipment images, guarantees image imaging quality and precision, and the medical personnel of being convenient for diagnose.
Description
Technical Field
The utility model relates to a magnetic resonance technology field especially relates to a gradient coil subassembly and magnetic resonance equipment.
Background
In magnetic resonance systems, the field drift is mainly due to a decrease in magnetism as the temperature of the passive shimming material inside the gradient coil increases. There are currently many solutions to reduce the field drift, such as placing cooling water tubes next to the passive shimming material, such as mounting the shimming material on the inner wall of the magnet, with some water tubes placed around the shimming. A common problem with these approaches to control field drift is that during long runs of high intensity sequences, the cooling capacity of the water cooling is already saturated, and the temperature of the shim material inside the gradient coil will continue to rise, subject to the continued operation of the gradient coil, and the field drift will be large.
SUMMERY OF THE UTILITY MODEL
In view of the above, there is a need to provide a gradient coil assembly and a magnetic resonance apparatus for reducing field drift in order to solve the problem of field drift caused by the continuously increased shimming material degree during the operation of the current magnetic resonance system.
The above purpose is realized by the following technical scheme:
a gradient coil assembly comprising:
a gradient coil for generating a gradient field;
shim assemblies disposed along a peripheral side of the gradient coil; and
a heating assembly disposed on a peripheral side of the shim assembly, the heating assembly being thermally coupled to the shim assembly.
In one embodiment, the gradient coil assembly further comprises a control assembly electrically connected with the heating assembly, the control assembly comprises a power supply and a control host electrically connected with the power supply, the heating assembly is electrically connected with the power supply, and the control host controls the power supply to be powered on and off.
In one embodiment, the heating assembly comprises a first heating element, the first heating element is arranged along the circumferential inner side of the shimming assembly and is electrically connected with the control assembly, and the first heating element is used for heating or insulating the shimming assembly.
In one embodiment, the heating assembly further comprises a first temperature detection piece, the first temperature detection piece is arranged on the inner side of the shimming assembly and is used for detecting the temperature of the inner wall of the shimming assembly, and the first temperature detection piece is further electrically connected with the control assembly and feeds the temperature of the inner wall of the shimming assembly back to the control assembly.
In one embodiment, the heating assembly comprises a second heating element, the second heating element is arranged along the circumferential outer side of the shimming assembly and is electrically connected with the control assembly, and the second heating element is used for heating or keeping warm for the shimming assembly.
In one embodiment, the first heating member or the second heating member includes a continuous bent structure formed of a conductive material.
In one embodiment, the shim assembly comprises a mounting housing arranged along the circumferential direction of the gradient coil and a plurality of shim bars, the mounting housing has a plurality of shim holes along the circumferential direction, and the shim bars are respectively mounted in the mounting housing through the shim holes.
A gradient coil assembly, the gradient coil assembly comprising:
the gradient coil comprises a main coil and a secondary coil; the shimming assembly is positioned between the primary coil and the secondary coil; and
a heating assembly disposed on a peripheral side of the shim assembly;
and the control assembly is electrically connected with the heating assembly and is used for controlling the heating assembly to heat or preserve heat of the shimming assembly.
In one embodiment, the heating assembly comprises a first heating element and a second heating element, the first heating element is arranged between the shimming assembly and the main coil, and the second heating element is arranged between the shimming assembly and the secondary coil.
A magnetic resonance apparatus comprising an imaging body having a magnet bore and a gradient coil assembly disposed in the imaging body; the gradient coil assembly is used for heating or insulating the shimming assembly, and the gradient coil assembly comprises:
the gradient coil comprises a main coil and a secondary coil; a shim assembly is positioned between the primary coil and the secondary coil;
the heating assembly is used for heating and insulating the shimming assembly; and
and the control component is electrically connected with the heating component and used for controlling a power supply source to supply power to the heating component and cut off the power.
Adopt above-mentioned technical scheme, the utility model discloses following technological effect has at least:
the utility model discloses a gradient coil subassembly and magnetic resonance equipment, shimming subassembly enclose the week side setting of locating gradient coil, through the magnetic field of the even gradient coil of shimming subassembly, and the while control subassembly controls heating element and heats and keeps warm to the shimming subassembly. Through the cooperation of shimming subassembly and heating element, the effectual shimming material degree of solving when present magnetic resonance system moves lasts the field problem of wafting that rises and lead to for the moderate stability of temperature of shimming subassembly is at the fixed value, guarantees the temperature stability of shimming subassembly, and the field that reduces the shimming subassembly is wafted, and then the imaging effect when guaranteeing the formation of image of magnetic resonance equipment, guarantees image imaging quality and precision, the medical personnel's diagnosis of being convenient for.
Drawings
Fig. 1 is a schematic structural diagram of a gradient coil assembly according to an embodiment of the present invention;
FIG. 2 is a perspective view of the gradient coil assembly of FIG. 1 with a first heating element disposed in the secondary coil;
FIG. 3 is a schematic diagram of a first heating element in the gradient coil assembly shown in FIG. 2.
Wherein:
100. a gradient coil assembly;
110. a gradient coil; 111. a secondary coil; 112. a main coil;
120. a heating assembly; 121. a first heating member; 122. a second heating member; 123. a first temperature detection member; 124. a second temperature detection member;
130. a control component; 131. a power supply; 132. a control host;
200. a shim assembly.
Detailed Description
In order to make the above objects, features and advantages of the present invention more comprehensible, embodiments of the present invention are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, as those skilled in the art will be able to make similar modifications without departing from the spirit and scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.
Referring to fig. 1, the present disclosure provides a gradient coil assembly 100. The gradient coil assembly 100 is used in a magnetic resonance apparatus for controlling a field drift of a gradient coil of the magnetic resonance apparatus such that a magnetic field of the gradient coil is stabilized. It can be understood that the shimming ability is reduced after the temperature of the existing shimming strips is increased, so that the gradient coil drifts on site, and the shimming strips are cooled by a water-cooling mode generally, but the mode has a limitation, and when the water-cooling mode is saturated, the temperature of the shimming strips is continuously increased under the influence of continuous operation of the gradient coil, so that the shimming strips further drift. The shim bars need to be at a relatively constant temperature to prevent the field of the main magnetic field from drifting.
Therefore, the utility model provides a gradient coil assembly 100 through the heating methods constancy of temperature, avoids gradient coil to produce the field and wafts, and image quality and precision are guaranteed to the formation of image effect when guaranteeing the formation of image of magnetic resonance equipment. The specific structure of the gradient coil assembly 100 is described in detail below.
In an embodiment, the gradient coil assembly 100 is used to heat and insulate the shim assembly 200. The gradient coil assembly 100 includes a gradient coil 110, a heating assembly 120, and a control assembly 130. Shim assemblies 200 are disposed along a peripheral side of the gradient coil 110. The heating assembly 120 is arranged on the peripheral side of the shim assembly 200, the heating assembly 120 being used to heat and/or keep warm the shim assembly 200. The control assembly 130 is electrically connected with the heating assembly 120, and the control assembly 130 controls the heating assembly 120 to heat and insulate the shimming assembly 200.
The shim assembly 200 may comprise ferromagnetic shims for adjusting the main magnetic field of the magnetic resonance system so that the main magnetic field distribution of the magnetic resonance system is more uniform. Optionally, the ferromagnetic shimming pieces can be made of ferromagnetic materials such as silicon steel and carbon steel. Therefore, the magnetic resonance equipment can ensure the imaging effect on the scanning area during imaging, and ensure the imaging quality and precision of the image. Shim assemblies 200 are disposed along a peripheral side of the gradient coil 110. Generally, the gradient coil 110 is a cylinder, accordingly, the shim assemblies 200 are arranged in a circular ring shape, the shim assemblies 200 are arranged in the gradient coil 110, and the number of the shim assemblies 200 is one, so that the requirement of uniform magnetic field of the gradient coil 110 can be met by one shim assembly 200.
Shim assemblies 200 are disposed in the gradient coil 110. In this embodiment, as shown in fig. 1, the gradient coil 110 surrounds to form a bore, and a plurality of through holes are opened in the gradient coil 110, the through holes extending in an axial direction of the bore. Further, the gradient coil 110 includes a main coil 112 and a sub-coil 111 sleeved outside the main coil 112. For example, a plurality of through holes are located between the primary coil 112 and the secondary coil 111 sleeved outside the primary coil 112, and the plurality of through holes are circumferentially arranged along the circumferential direction of the primary coil 112. The spacing between adjacent vias may be set to be equal or non-equal. Shim assemblies 200 are also provided in plurality, with one shim assembly 200 being received within each through-hole. Correspondingly, shim assemblies 200 formed from ferromagnetic shims also extend in the axial direction of the bore, as shown in fig. 2.
The main coils 112 in the present embodiment for generating the main gradient fields may include three coils that generate X, Y, Z axial gradient magnetic fields. Likewise, the secondary coil 111 may also be referred to as a shield coil, which also includes three X, Y, Z axially shielded coils.
The heating assembly 120 is used for heating and insulating the shim assembly 200. After the heating assembly 120 heats the shimming assembly 200, the temperature of the shimming assembly 200 can be raised, and when the temperature of the shimming assembly 200 reaches a preset temperature, the heating assembly 120 keeps the temperature of the shimming assembly 200 so that the temperature of the shimming assembly 200 is stabilized at the preset temperature. That is, the heating assembly 120 elevates the temperature of the shim assembly 200 and stabilizes the temperature of the shim assembly 200 at a fixed value at all times to eliminate field drift of the shim assembly 200.
The gradient coil assembly 100 of the above embodiment utilizes the magnetic field of the shimming assembly 200 to homogenize the gradient coil 110, and heats and preserves the temperature of the shimming assembly 200 through the heating assembly 120, so that the temperature of the shimming assembly 200 is stabilized at a fixed value, the problem of field drift caused by the continuous rise of the shimming material degree during the operation of the existing magnetic resonance system is effectively solved, the temperature of the shimming assembly 200 is moderate, the temperature stability of the shimming assembly 200 is ensured, the field drift of the shimming assembly 200 is reduced, the imaging effect of the magnetic resonance device during imaging is further ensured, the imaging quality and precision of images are ensured, and the diagnosis of medical personnel is facilitated.
In an embodiment, the control assembly 130 is electrically connected to the heating assembly 120, and whether the heating assembly 120 heats the shim assembly 200 is controlled by the control assembly 130. The control assembly 130 is an automatic control component of the gradient coil assembly 100, the automatic control of the heating assembly 120 is realized through the control assembly 130, medical personnel are not required to monitor the heating temperature of the shimming assembly 200, and the control assembly 130 can automatically realize the heating and heat preservation control of the heating assembly 120. The control assembly 130 stores a preset value of heating temperature in advance, and when the temperature of the heating assembly 120 for heating the shimming assembly 200 reaches the preset value, the control assembly 130 controls the heating assembly 120 to stop heating and keeps the temperature of the shimming assembly 200 so as to enable the temperature of the shimming assembly 200 to be stabilized at the preset value.
It will be appreciated that the shim assembly 200 is active when the magnetic resonance apparatus is not in use, and that the control assembly 130 controls the heating assembly 120 to be inactive. The shimming assemblies 200 need to be preheated before the magnetic resonance apparatus is used, and at this time, an operator may send a control signal to the control assembly 130, and the control assembly 130 may control the heating assembly 120 to heat the shimming assemblies 200. When the temperature of the shimming assembly 200 reaches a preset value, the control assembly 130 controls the heating assembly 120 to preserve the temperature of the shimming assembly 200. At this time, the magnetic resonance apparatus can image a scan region of the scan subject. It is understood that the scanning object may be a patient, a small animal or a device requiring flaw detection, etc., and the scanning area may be a lesion position or other positions, etc.
By way of example, it is assumed that the preset value of the heating temperature of the shim assembly 200 is 40 ℃ and that the temperature of the shim assembly 200 when not in use is 20 ℃. Before the magnetic resonance apparatus is used, the control component 130 controls the heating component 120 to heat, the heating temperature of the heating component 120 is greater than 40 ℃, for example, 50 ℃, so as to raise the temperature of the shim assembly 200 from 20 ℃ to 40 ℃, and then the control component 130 controls the heating component 120 to maintain the temperature of the shim assembly 200 at 40 ℃. Meanwhile, when the temperature of the shim assembly 200 fluctuates, for example, below 40 ℃, the control assembly 130 needs to control the heating assembly 120 to heat; if the temperature of the shimming assembly 200 is higher than 40 ℃, the control assembly 130 controls the heating assembly 120 to stop heating and keep warm, so that the shimming assembly 200 is restored to 40 ℃. In this way, stabilization of the temperature of the shim assembly 200 at a fixed value is achieved. The cooperation of the control assembly 130, the shim assembly 200 and the heating assembly 120 is illustrated by the above temperatures. Of course, in other embodiments of the present invention, the heating temperature preset value of the shim assembly 200 is not limited to 40 ℃, and may be other temperatures.
In one embodiment, the heating assembly 120 includes a first heating member 121, the first heating member 121 is disposed along the circumferential inner side of the shimming assembly 200 and is electrically connected to the control assembly 130, and the first heating member 121 is used for heating and insulating the shimming assembly 200. The shimming assemblies 200 are arranged in an annular shape, and the first heating assembly 120 is arranged on the inner wall of the shimming assembly 200 in an annular shape and used for heating the inner wall of the shimming assembly 200, so that the temperature of the inner wall of the shimming assembly 200 is increased, and the purpose of increasing the temperature of the shimming assembly 200 is achieved.
Optionally, the first heating element 121 is a heating wire, which is arranged along the circumferential direction of the shimming assembly 200. The first heating member 121 is a continuous bent structure formed of a conductive material, and the continuous bent structure may be, for example, an arch structure, an i-shaped structure, a Z-shaped structure, a V-shaped structure, a trapezoidal structure, a rectangular structure, a # -shaped structure, or the like. Of course, the first heating members 121 may also be provided in a net structure or a parallel strip structure, etc. In this embodiment, as shown in fig. 2, the first heating members 121 are continuously bent from an iron-chromium-aluminum alloy material, and the first heating members 121 are laid outside the main coil 112 of the gradient coil 110. Of course, other high-resistance conductive materials may be used for the first heating member 121, and the material of the first heating member 121 is not particularly limited in the embodiment of the present application.
When the first heating wire is powered on, the first heating wire can emit heat to heat the inner wall of the shimming assembly 200 in a radiation heating mode. Of course, in other embodiments of the present invention, the first heating element 121 may further include a plurality of heating sheets formed by splicing, or may be another component capable of realizing a heating function. Alternatively, the thickness of the first heating member 121 ranges from 0.8mm to 2 mm. Preferably, the first heating member 121 is formed by splicing 1mm heating sheets.
In this embodiment, the continuous bent structure formed by the first heating member 121 is formed as a single body, and the first heating member 121 can be driven by an external power source, as shown in fig. 3. In other embodiments, the first heating member 121 may be provided as a plurality of continuous bent structures arranged side by side, and the plurality of continuous bent structures arranged side by side may be respectively and independently driven by an external power source. By such a discrete heating structure, accurate temperature control can be performed for the local shim assembly 200 in the gradient coil 110, improving the accuracy of shim control.
In one embodiment, the heating assembly 120 further comprises a first temperature detection member 123, the first temperature detection member 123 being disposed inside the shim assembly 200 for detecting the temperature of the inner wall of the shim assembly 200, the first temperature detection member 123 being further electrically connected to the control assembly 130 for feeding back the temperature of the inner wall of the shim assembly 200 to the control assembly 130.
The first temperature detection piece 123 is arranged on the inner wall of the shimming assembly 200, so that the first temperature detection piece 123 can monitor the temperature of the inner wall of the shimming assembly 200 in real time and feed back the temperature to the control assembly 130, and the control assembly 130 judges whether the heating assembly 120 is in a heating state, a heat preservation state or a stop working state according to the temperature. When the temperature detected by the first temperature detecting element 123 reaches the preset value of the heating temperature of the shimming assembly 200, the control element 130 controls the first heating element 121 to stop heating and controls the first heating element 121 to keep warm, so that the shimming assembly 200 is kept at the preset value of the heating temperature. When the temperature detected by the first temperature detecting element 123 does not reach the preset value of the heating temperature of the shimming assembly 200, the control element 130 controls the first heating element 121 to continue heating until the heating temperature of the shimming assembly 200 reaches the preset value.
Optionally, the first temperature detecting element 123 is a temperature probe, a temperature sensor, or other components capable of detecting temperature. Alternatively, the number of first temperature detection members 123 may be one, with one first temperature detection member 123 being disposed on an inner wall of the shim assembly 200 at any location. Of course, in other embodiments of the present invention, the number of the first temperature detecting elements 123 may also be multiple, and the interval distribution of the first temperature detecting elements 123 on the inner wall of the shimming assembly 200 guarantees the accuracy of the temperature measurement of the inner wall of the shimming assembly 200 by the multipoint temperature measuring method, and guarantees the consistency of the heating temperature of each part of the shimming assembly 200.
In one embodiment, the heating assembly 120 includes a second heating element 122, the second heating element 122 is disposed along the circumferential outer side of the shimming assembly 200 and is electrically connected to the control assembly 130, and the second heating element 122 is used for heating and keeping warm the shimming assembly 200. The shimming assembly 200 is annularly arranged, and the second heating assembly 120 is annularly arranged on the outer wall of the shimming assembly 200 and is used for heating the outer wall of the shimming assembly 200, so as to increase the temperature of the outer wall of the shimming assembly 200 and achieve the purpose of increasing the temperature of the shimming assembly 200.
Optionally, the second heating element 122 is a heating wire, which is arranged along the circumferential direction of the shimming assembly 200. The second heating members 122 are continuous bent structures formed of a conductive material, and the continuous bent structures may be, for example, arch structures, i-shaped structures, Z-shaped structures, V-shaped structures, trapezoidal structures, rectangular structures, well-shaped structures, and the like. Of course, the second heating members 122 may also be provided in a net structure or a parallel strip structure, etc. In this embodiment, the second heating member 122 is continuously bent from an iron-chromium-aluminum alloy material, and the second heating member 122 is laid inside the sub-coils 111 of the gradient coil 110. Of course, other high-resistance conductive materials may be used for the second heating members 122, and the material of the second heating members 122 is not particularly limited in the embodiment of the present application.
When the second heating wire is powered on, the second heating wire can emit heat to heat the outer wall of the shimming assembly 200 in a radiation heating mode. Of course, in other embodiments of the present invention, the second heating element 122 may also include a plurality of heating sheets formed by splicing, or may be another component capable of realizing a heating function. Alternatively, the thickness of the second heating member 122 ranges from 0.8mm to 2 mm. Preferably, the second heating members 122 are formed by splicing 1mm heating sheets.
In this embodiment, the continuous bent structure formed by the second heating member 122 is formed as a single body, and the second heating member 122 can be driven by an external power source. It should be noted that the structure of the second heating element 122 is substantially the same as that of the first heating element 121, as shown in fig. 3, which is not repeated herein. In other embodiments, the second heating members 122 may be provided as a plurality of continuous bent structures arranged side by side, and the plurality of continuous bent structures arranged side by side may be respectively and independently driven by an external power source. By such a discrete heating structure, accurate temperature control can be performed for the local shim assembly 200 in the gradient coil 110, improving the accuracy of shim control.
In one embodiment, the heating assembly 120 further comprises a second temperature detection member 124, the second temperature detection member 124 being disposed on an outer wall of the shim assembly 200 for detecting the temperature of the outer wall of the shim assembly 200, the second temperature detection member 124 being further electrically connected to the control assembly 130 for feeding back the temperature of the outer wall of the shim assembly 200 to the control assembly 130.
The second temperature detection element 124 is arranged on the outer wall of the shim assembly 200, so that the second temperature detection element 124 can monitor the temperature of the outer wall and the inner wall of the shim assembly 200 in real time and feed back the temperature to the control assembly 130, and the control assembly 130 judges whether the heating assembly 120 is in a heating state, a heat preservation state or a stop working state according to the temperature. When the temperature detected by the second temperature detecting element 124 reaches the preset value of the heating temperature of the shimming assembly 200, the control element 130 controls the second heating element 122 to stop heating and controls the second heating element 122 to keep warm, so that the shimming assembly 200 is kept at the preset value of the heating temperature. When the temperature detected by the second temperature detecting element 124 does not reach the preset value of the heating temperature of the shimming assembly 200, the control assembly 130 controls the second heating element 122 to continue heating until the heating temperature of the shimming assembly 200 reaches the preset value.
Optionally, the second temperature detecting element 124 is a temperature probe, a temperature sensor or other components capable of detecting temperature. Alternatively, the number of the second temperature detection members 124 may be one, with one second temperature detection member 124 disposed on an outer wall of the shim assembly 200 at any location. Of course, in other embodiments of the present invention, the number of the second temperature detecting elements 124 may also be multiple, and the second temperature detecting elements 124 are distributed on the outer wall of the shimming assembly 200 at intervals, so as to ensure the accuracy of temperature measurement of the outer wall of the shimming assembly 200 by means of multi-point temperature measurement, and ensure that the heating temperatures of the shimming assembly 200 are consistent.
In one embodiment, the control assembly 130 includes a power supply 131 and a control host 132 electrically connected to the power supply 131, the first heating element 121 and the second heating element 122 are electrically connected to the power supply 131, the control host 132 controls the power supply 131 to supply power and cut off power, and the control host 132 is further electrically connected to the first temperature detecting element 123 and the second temperature detecting element 124. The power supply 131 is used for supplying power to the first heating member 121 and the second heating member 122, and the first heating member 121 and the second heating member 122 can be heated or kept warm after being electrified. The power supply 131 is controlled by the control host 132. The control host 132 controls the power supply 131 to supply power to the first heating member 121 and the second heating member 122, and the first heating member 121 and the second heating member 122 are heated or insulated. The control host 132 controls the power supply 131 to be powered off, and the first heating element 121 and the second heating element 122 stop working.
Furthermore, the control host 132 is electrically connected to the first temperature detector 123 and the second temperature detector 124. The first temperature detecting element 123 and the second temperature detecting element 124 feed back the detected temperature to the control host 132 in real time, and the control host 132 controls the first heating element 121 and the second heating element 122 according to the fed-back detected temperature. When the detected temperatures fed back by the first temperature detecting element 123 and the second temperature detecting element 124 reach a predetermined value, the control component 130 controls the first heating element 121 and the second heating element 122 to keep warm. When the detected temperatures fed back by the first temperature detecting element 123 and the second temperature detecting element 124 are lower than the preset value, the controller controls the first heating element 121 and the second heating element 122 to continue heating until the detected temperatures reach the preset value.
In one embodiment, the shim assembly 200 includes a mounting housing disposed circumferentially along the gradient coil and having a plurality of shim holes in a circumferential direction, and a plurality of shim bars respectively mounted in the mounting housing through the plurality of shim holes. The mounting shell is arranged in an annular shape and is arranged in the gradient coil. The mounting shell is provided with a plurality of shimming holes in the circumferential direction, and the shimming strips are respectively mounted in the mounting shell through the shimming holes.
The first heating member 121 abuts against the inner wall of the mounting housing to heat the inner wall of the mounting housing, thereby achieving the purpose of heating the surface of the shim strip. Correspondingly, the second heating member 122 abuts against the outer wall of the mounting housing and is used for heating the outer wall of the mounting housing, so as to achieve the purpose of heating the other surface of the shim strip.
Before the magnetic resonance device runs in sequence, the control host 132 controls the power supply 131 to energize the first heating element 121 and the second heating element 122, and the temperature of the shimming strips is stabilized after certain time of energization. And (3) running the sequence, wherein the first heating element 121 and the second heating element 122 are always operated during the whole sequence running process, and the temperature of the shimming strips is always stabilized at a fixed value, so that the field drift of the shimming strips is eliminated.
Moreover, the stable operation temperature of the first heating element 121 and the second heating element 122 is higher than the maximum temperature of the gradient coil transferred to the shim bars, for example, the temperature of the gradient coil transferred to the shim bars is at most 40 ℃, and the stable operation temperature of the first heating element 121 and the second heating element 122 may be defined as 50 ℃. When the first heating member 121 and the second heating member 122 are designed, the energization current of the first heating member 121 and the second heating member 122 is calculated based on the steady operation temperature of the first heating member 121 and the second heating member 122 and the heating efficiency (steady operation temperature rise by unit current) of the first heating member 121 and the second heating member 122. The calculation formula is as follows:
I＝(Tc-T0)/f
wherein I is the current passing through the first heating element 121 and the second heating element 122, and T iscThe stable operation temperature, T, of the first heating member 121 and the second heating member 1220F is the heat generation efficiency of the first heating member 121 and the second heating member 122, which is a background temperature (which may be defined as room temperature of 20 ℃).
The utility model also provides a gradient coil. The gradient coil is used in a magnetic resonance apparatus for providing the magnetic field required by the magnetic resonance apparatus. The gradient coil assembly 100 is used to heat and insulate the shim assembly 200. The gradient coil assembly 100 includes a gradient coil 110, a heating assembly 120, and a control assembly 130. The gradient coil 110 includes a main coil 112 and a sub-coil 111 sleeved outside the main coil 112. Shim assemblies 200 are disposed along a peripheral side of the main coils 112. The heating assembly 120 is arranged at the periphery of the shimming assembly 200, and the heating assembly 120 is used for heating and insulating the shimming assembly 200. The control assembly 130 is electrically connected with the heating assembly 120, and the control assembly 130 controls the heating assembly 120 to heat and insulate the shimming assembly 200.
The gradient coil 110 includes a main coil 112 and a sub-coil 111 arranged in a cylindrical shape, the sub-coil 111 is sleeved outside the main coil 112, and the gradient coil assembly 100 is installed between the main coil 112 and the sub-coil 111. The gradient coil assembly 100 of the present invention is substantially the same as the structure and the operation principle of the gradient coil assembly 100 in the above embodiments, and is not repeated herein.
In one embodiment, the heating assembly 120 includes a first heating element 121 and a second heating element 122, the first heating element 121 is disposed between the shimming assembly 200 and the main coil 112, the second heating element 122 is disposed between the shimming assembly 200 and the secondary coil 111, the first heating element 121 is used for heating and maintaining the temperature of the shimming assembly 200, and the second heating element 122 is used for heating and maintaining the temperature of the shimming assembly 200. The first heating element 121 is located between the mounting housing and the main coil 112 to heat the inner wall of the mounting housing for the purpose of heating a surface of the shim strips. Correspondingly, a second heating element 122 is located between the mounting housing and the secondary coil 111 for heating the outer wall of the mounting housing for the purpose of heating the other surface of the shim strip.
Optionally, the first heating member 121, the second heating member 122, the main coil 112 and the sub-coil 111 are formed by an integral glue filling method.
In designing the first heating member 121 and the second heating member 122, it is necessary to test the energizing current and the stabilization time of the first heating member 121 and the second heating member 122. The specific debugging process is as follows:
the first heating element 121 and the second heating element 122 are manufactured by glue-pouring together with the main coil 112 and the sub-coil 111, and a constant I-100 mA current is supplied to the power supply 131. Subsequently, the temperature data detected by the first temperature detecting element 123 and the second temperature detecting element 124 are continuously read until the temperature is stable, and the maximum temperature of the first temperature detecting element 123 and the second temperature detecting element 124 is taken as T. Calculating the heating efficiency f ═ T-T of the first heating member 121 and the second heating member 1220) And I. Calculating the normal working current I ═ T of the first heating element 121 and the second heating element 122c-T0) And/f. The power supply 131 is powered down until the initial temperature is restored. The constant normal operating current I supplied to the power supply 131 is recorded, and the temperature stabilization time t of the first heating member 121 and the second heating member 122 is recorded. The normal working energization current I and the temperature stabilization time t of the first heating element 121 and the second heating element 122 are recorded in the control for system calling during normal scanning of the magnetic resonance system.
The utility model also provides a magnetic resonance equipment, including the inspection bed, have the formation of image organism and the gradient coil in magnet hole, the gradient coil sets up in the formation of image organism, and the inspection bed can drive the patient immigration or shift out the magnet hole. The gradient coil assembly 100 is used to heat and insulate the shim assembly 200. The gradient coil assembly 100 includes a gradient coil 110, a heating assembly 120, and a control assembly 130. The gradient coil 110 includes a main coil 112 and a sub-coil 111 sleeved outside the main coil 112. Shim assemblies 200 are disposed along a peripheral side of the main coils 112. The heating assembly 120 is arranged at the periphery of the shimming assembly 200, and the heating assembly 120 is used for heating and insulating the shimming assembly 200. The control assembly 130 is electrically connected with the heating assembly 120, and the control assembly 130 controls the heating assembly 120 to heat and insulate the shimming assembly 200.
The gradient coil in the magnetic resonance apparatus of the present invention is the gradient coil in the above-mentioned embodiment, and includes the gradient coil assembly 100 in the above-mentioned embodiment, and the specific structure of the gradient coil assembly 100 has been mentioned above, which is not repeated herein. The utility model discloses a magnetic resonance equipment adopts gradient coil subassembly 100 to carry out evenly to the magnetic field that gradient coil 110 of gradient coil produced to reduce the field and waft, guarantee magnetic resonance equipment's formation of image quality and precision.
The utility model discloses a magnetic resonance equipment can heat shimming subassembly 200 according to following step when using: firstly, the power supply 131 is turned on, the current output by the power supply 131 is kept at the normal working energizing current I, such as 100mA, and the temperature stabilization time t of the shim bars is waited, such as 2 minutes. Then, the patient is driven into the magnet hole by the examination bed so as to scan the focus area of the patient. After the scanning is finished, the power supply 131 is turned off.
In the actual use process, in order to reduce the temperature stabilization time of the shimming strips, the power supply 131 may be turned on before the first scanning, and then the power supply 131 is kept continuously operating during the subsequent scanning, so that the first heating element 121 and the second heating element 122 are controlled to be in the heat preservation state, and the power supply 131 is turned off after all scanning is finished.
The technical features of the embodiments described above can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (10)
1. A gradient coil assembly, comprising:
a gradient coil for generating a gradient field;
shim assemblies disposed along a peripheral side of the gradient coil; and
a heating assembly disposed on a peripheral side of the shim assembly, the heating assembly being thermally coupled to the shim assembly.
2. The gradient coil assembly of claim 1, further comprising a control assembly electrically connected to the heating assembly, the control assembly comprising a power supply and a control host electrically connected to the power supply, the heating assembly being electrically connected to the power supply, the control host controlling the power supply to be powered on and off.
3. The gradient coil assembly of claim 2, wherein the heating assembly comprises a first heating element disposed along a circumferential inner side of the shim assembly and electrically connected to the control assembly, the first heating element for heating or insulating the shim assembly.
4. The gradient coil assembly of claim 3, wherein the heating assembly further comprises a first temperature detection element disposed inside the shim assembly for detecting the temperature of the inner wall of the shim assembly, the first temperature detection element being further electrically connected to the control assembly for feeding back the temperature of the inner wall of the shim assembly to the control assembly.
5. The gradient coil assembly of claim 4, wherein the heating assembly comprises a second heating element disposed along a circumferential outer side of the shim assembly and electrically connected to the control assembly, the second heating element for heating or maintaining temperature of the shim assembly.
6. The gradient coil assembly of claim 5, wherein the first heating element or the second heating element comprises a continuous meander structure formed from an electrically conductive material.
7. The gradient coil assembly of any of claims 1 to 6, wherein the shim assembly comprises a mounting housing disposed circumferentially along the gradient coil and a plurality of shim bars, the mounting housing having a plurality of shim holes in a circumferential direction through which the shim bars are respectively mounted in the mounting housing.
8. A gradient coil assembly, characterized in that the gradient coil assembly comprises:
the gradient coil comprises a main coil and a secondary coil; a shim assembly is positioned between the primary coil and the secondary coil; and
a heating assembly disposed on a peripheral side of the shim assembly;
and the control assembly is electrically connected with the heating assembly and is used for controlling the heating assembly to heat or preserve heat of the shimming assembly.
9. The gradient coil assembly of claim 8, wherein the heating assembly comprises a first heating member disposed between the shim assembly and the primary coil and a second heating member disposed between the shim assembly and the secondary coil.
10. A magnetic resonance apparatus comprising an imaging body having a magnet bore and a gradient coil assembly disposed in the imaging body; the gradient coil assembly is used for heating or insulating the shimming assembly, and the gradient coil assembly comprises:
the gradient coil comprises a main coil and a secondary coil; the shimming assembly is positioned between the primary coil and the secondary coil;
the heating assembly is used for heating and insulating the shimming assembly; and
and the control component is electrically connected with the heating component and used for controlling a power supply source to supply power to the heating component and cut off the power.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114200366A (en) * | 2021-12-16 | 2022-03-18 | 武汉联影生命科学仪器有限公司 | Shimming device, magnetic field assembly, magnetic resonance imaging system and shimming method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114200366A (en) * | 2021-12-16 | 2022-03-18 | 武汉联影生命科学仪器有限公司 | Shimming device, magnetic field assembly, magnetic resonance imaging system and shimming method |
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