CN210401637U - Body transmitting coil apparatus - Google Patents
Body transmitting coil apparatus Download PDFInfo
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- CN210401637U CN210401637U CN201920805633.8U CN201920805633U CN210401637U CN 210401637 U CN210401637 U CN 210401637U CN 201920805633 U CN201920805633 U CN 201920805633U CN 210401637 U CN210401637 U CN 210401637U
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Abstract
The application relates to a body transmitting coil device, establish through setting up first birdcage coil and cover second birdcage coil on the first birdcage coil, and first birdcage coil and/or second birdcage coil can be relative the dielectric layer slides, makes the overlapping region area that first metal leg, dielectric layer and second metal leg produced produces changes. Further, the adjustable birdcage coil equipment that this application provided can be according to patient's size adjustment the overlap region area that first metal leg, dielectric layer and second metal leg produced, and then can adjust the magnetic field excitation area of whole body transmission coil equipment, and then the SAR value that the adjustment magnetic field produced and the power of the radio frequency power amplifier of consumption, the maximize is saving the resource, accomplishes the magnetic field excitation operation under the prerequisite of reducing harm to the human body.
Description
Technical Field
The present application relates to the field of magnetic resonance medical technology, and in particular, to a body transmit coil apparatus.
Background
Birdcage coils, also called volume transmit coils, are a very important core component of magnetic resonance medical systems for exciting nuclear magnetic signals. The birdcage coil is shaped like a birdcage and consists of two metal rings which are parallel to each other and a plurality of metal legs between the two metal rings. Traditional birdcage coil divide into low logical type birdcage coil, high pass type birdcage coil and area lead to type birdcage coil three types. The capacitor of the low-pass birdcage coil is arranged above each metal leg. The high-pass birdcage coil has capacitors arranged on the metal rings at the two ends. The capacitors of the band-pass birdcage coil are provided on both the metal legs and the end rings.
However, the conventional birdcage coil has a great problem. The effective field of magnetic field excitation of a conventional birdcage coil is fixed. The larger the effective area of magnetic field excitation, the higher the SAR value produced and the greater the power consumed by the radio frequency power amplifier. The SAR value, also known as the specific absorption rate, refers to the amount of electromagnetic radiation energy absorbed by the human body per unit of scanning time. The lower the SAR value, the less electromagnetic radiation is absorbed by the human body, the more critical is the health risk impact on the human body. Therefore, the conventional birdcage coil cannot change the effective region excited by the magnetic field according to the difference between the body types and the scanning parts of different patients, so that the SAR value and the consumed power generated by the birdcage coil in the using process are not matched with the actual scanning requirements of the patients.
SUMMERY OF THE UTILITY MODEL
In view of the above, there is a need to provide a body transmit coil apparatus for solving the problem that the birdcage coil in the conventional scheme cannot change the effective field excited by the magnetic field according to the difference between the body sizes and the scanning positions of different patients.
The application provides a body transmitting coil device, which is suitable for a magnetic resonance system and comprises a first birdcage coil and a second birdcage coil sleeved on the first birdcage coil;
the first birdcage coil includes:
a first end ring comprising at least two first sub-end rings with a tunable capacitor disposed therebetween;
a second end ring arranged in parallel with the first end ring, comprising at least two second sub-end rings between which the tunable capacitor is arranged;
a plurality of first metal legs disposed between the first sub-end ring and the second sub-end ring, one end of the first metal legs being fixedly connected to the first end ring, and the other end of the first metal legs being fixedly connected to the second end ring;
the second birdcage coil includes:
a third end ring comprising at least two third sub-end rings with the tunable capacitor disposed therebetween;
a fourth end ring arranged in parallel with the third end ring and comprising at least two fourth sub-end rings, the tunable capacitor being arranged between the two fourth sub-end rings;
a plurality of second metal legs, which are arranged between the third terminal ring and the third terminal ring, wherein one end of each second metal leg is fixedly connected with the third terminal ring, and the other end of each second metal leg is fixedly connected with the fourth terminal ring;
the first metal leg and the second metal leg are parallel to each other and arranged side by side;
a dielectric layer is disposed between the first birdcage coil and the second birdcage coil, and the first birdcage coil and/or the second birdcage coil can slide relative to the dielectric layer, so that an area of an overlapping region generated by the first metal leg, the dielectric layer, and the second metal leg changes.
The application relates to a body transmitting coil device, establish through setting up first birdcage coil and cover second birdcage coil on the first birdcage coil, and first birdcage coil and/or second birdcage coil can be relative the dielectric layer slides, makes the overlapping region area that first metal leg, dielectric layer and second metal leg produced produces changes. Further, the adjustable birdcage coil equipment that this application provided can be according to patient's size adjustment the overlap region area that first metal leg, dielectric layer and second metal leg produced, and then can adjust the magnetic field excitation area of whole body transmission coil equipment, and then the SAR value that the adjustment magnetic field produced and the power of the radio frequency power amplifier of consumption, the maximize is saving the resource, accomplishes the magnetic field excitation operation under the prerequisite of reducing harm to the human body.
Drawings
Fig. 1 is a schematic structural diagram of a body transmitting coil device provided in an embodiment of the present application, which does not show an internal structure;
fig. 2 is a schematic structural diagram showing an internal structure of a body transmitting coil apparatus according to an embodiment of the present application;
fig. 3 is a schematic structural diagram showing an internal structure of a body transmitting coil apparatus according to an embodiment of the present application;
fig. 4 is a schematic diagram illustrating the cooperation of a first metal leg, a dielectric layer and a second metal leg in a body transmitting coil device according to an embodiment of the present application;
fig. 5 is a schematic diagram illustrating the cooperation of a first metal leg, a dielectric layer and a second metal leg in a body transmitting coil device according to an embodiment of the present application;
fig. 6 is a schematic diagram illustrating the cooperation of a first metal leg, a dielectric layer and a second metal leg in a body transmitting coil device according to an embodiment of the present application;
fig. 7 is a schematic diagram illustrating the cooperation of a first metal leg, a dielectric layer and a second metal leg in a body transmitting coil device according to an embodiment of the present application;
fig. 8 is a schematic diagram illustrating the matching of the first metal leg, the dielectric layer and the second metal leg in the body transmitting coil device according to an embodiment of the present application.
Reference numerals:
100 first birdcage coil
110 first end ring
111 first sub-end ring
112 adjustable capacitor
113 first end face
120 second end ring
121 second sub end ring
122 second end face
130 first metal leg
131 first buckle
132 third fastener
200 second birdcage coil
210 third end ring
211 third sub-end ring
212 third end face
220 fourth end ring
221 fourth sub-end ring
222 fourth end surface
230 second metal leg
231 second fastener
232 fourth fastener
300 dielectric layer
310 sub-dielectric layer
311 first card slot
312 second card slot
313 third card slot
314 fourth card slot
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
The present application provides a body transmit coil apparatus.
It should be noted that the application fields and application scenarios are not limited in the present application. Optionally, the body transmit coil apparatus provided herein is applied to a magnetic resonance system. In addition, the body emission coil device is not limited to be used in a magnetic resonance system, and can also be used in a medical device or medical system related to magnetic resonance, such as a large-scale functional metabolic and molecular imaging diagnosis device (PET/MR system) formed by integrally combining an electron emission computed tomography (PET) and a magnetic resonance imaging (MR), or a magnetic resonance radiotherapy system (MR/RT system).
As shown in fig. 1, 2 and 3, in an embodiment of the present application, the body transmit coil apparatus includes a first birdcage coil 100, a dielectric layer 300 and a second birdcage coil 200. The second birdcage coil 200 is sleeved on the first birdcage coil 100, and the first birdcage coil 100, the dielectric layer 300 and the second birdcage coil 200 together form a transmitting coil of a magnetic resonance system. The dielectric layer 300 is disposed between the first birdcage coil 100 and the second birdcage coil 200. Said first and/or said second birdcage coils 100, 200 are slidable relative to said dielectric layer 300, on the one hand the length of the transmit coil can be changed when said first and/or said second birdcage coils 100, 200 are slid relative to said dielectric layer 300, thereby increasing the excitation area of the radio frequency field. On the other hand, when the first birdcage coil 100 and/or the second birdcage coil 200 slide relative to the dielectric layer 300, the area of the overlapping region generated by the first metal leg 130, the dielectric layer 300, and the second metal leg 230 changes. Alternatively, the dielectric layer 300 may be fixedly disposed relative to a frame of the magnetic resonance system, the first birdcage coil 100 and the second birdcage coil 200 are respectively connected to a driving mechanism of the magnetic resonance system, and the position of at least one of the first birdcage coil 100 and the second birdcage coil 200 relative to the dielectric layer 300 is changed by controlling the driving mechanism.
Wherein the first birdcage coil 100 includes a first end ring 110, a second end ring 120, and a plurality of first metal legs 130. The first end ring 110 and the second end ring 120 are disposed in parallel. The plurality of first metal legs 130 are disposed between the first end ring 110 and the second end ring 120. One end of the first metal leg 130 is fixedly connected to the first end ring 110. The other end of the first metal leg 130 is fixedly connected to the second end ring 120.
The second birdcage coil 200 includes a third end-ring 210, a fourth end-ring 220, and a plurality of second metal legs 230. The third end ring 210 and the fourth end ring 220 are arranged in parallel. The plurality of second metal legs 230 are disposed between the third end ring 210 and the fourth end ring 220. One end of the second metal leg 230 is fixedly connected to the third end ring 210. The other end of the first metal leg 130 is fixedly connected to the fourth end ring 220. The first metal leg 130 and the second metal leg 230 are parallel to each other and are disposed side by side.
The first end ring 110 includes at least two first sub-end rings 111. A tunable capacitor 112 is disposed between the two first sub-end rings 111. The second end ring 120 includes at least two second sub-end rings 121. A tunable capacitor 112 is disposed between the two second sub-end rings 121. The third end ring 210 includes at least two third sub-end rings 211. A tunable capacitor 112 is disposed between the two third sub-end rings 211. The fourth end ring 220 includes at least two fourth sub-end rings. A tunable capacitor 112 is disposed between the two fourth sub-end rings. The plurality of first metal legs 130 are disposed between the first sub-end ring 111 and the second sub-end ring 121. The plurality of second metal legs 230 are disposed between the third sub-end ring 211 and the fourth sub-end ring.
Specifically, the body transmit coil apparatus provided herein is a band-pass birdcage coil. The first birdcage coil 100 and/or the second birdcage coil 200 can slide relative to the dielectric layer 300 such that an area of an overlap region created by the first metal leg 130, the dielectric layer 300, and the second metal leg 230 changes. Further, the adjustable birdcage coil metal leg portions are made to form a capacitance. The capacitance calculation formula (i.e., formula 1) is as follows:
wherein C is the capacitance of the metal leg part of the adjustable birdcage coil. ε represents a relative dielectric constant. k is the constant of the electrostatic force. d is the vertical distance between the first metal leg 130 and the second metal leg 230. S is the area of the overlap region created by the first metal leg 130, the dielectric layer 300, and the second metal leg 230.
As can be seen from equation 1, the values of ε, π, k, and d are fixed in this embodiment. Thus, as the area of the overlap region created by the first metal leg 130, the dielectric layer 300, and the second metal leg 230 changes, the capacitance of the metal leg portion of the adjustable birdcage coil changes. The resonance frequency of the adjustable birdcage coil is kept unchanged in the working process of the adjustable birdcage coil and is consistent with the resonance frequency of hydrogen atoms in a human body, so that an excitation region is normally generated. However, the resonant frequency of the adjustable birdcage coil is related to the total capacitance of the adjustable birdcage coil. The total capacitance of the adjustable birdcage coil must remain constant. The total capacitance of the adjustable birdcage coil includes the capacitance of the metal leg portions and the capacitance of the end-ring portions. As the capacitance of the tuning metal leg portions increases, the capacitance of the tuning end ring portions needs to decrease. Accordingly, when the capacitance of the tuning metal leg portion decreases, the capacitance of the tuning end ring portion needs to increase. The capacitance of the end-ring sections is adjusted by adjusting the tunable capacitors 112 on the first, second, third and fourth end- rings 110, 120, 210, 220.
By arranging said first birdcage coil 100 and/or said second birdcage coil 200 to be slidable with respect to said dielectric layer 300, the capacitance of metal leg portions of said adjustable birdcage coil is made adjustable. Further, medical personnel can be enabled to adaptively adjust the structure of the adjustable birdcage coil according to the size of the patient.
For example, when the patient is a small patient, the effective field for magnetic field excitation is small because the patient is small. When the whole body of a slim patient is scanned, the generated SAR value is low, and the consumed power of the radio frequency power amplifier is also low. At this point, the adjustable birdcage coil is set to long leg mode. That is, by sliding the first metal leg 130 and/or the second metal leg 230, the overlapping area generated by the first metal leg 130, the dielectric layer 300 and the second metal leg 230 is larger. The adjustable birdcage coil is in a long-leg mode, so that the effective area excited by the magnetic field is large, and the SAR value generated and the power consumed by the radio-frequency power amplifier are low.
When the patient is a tall or obese patient, the scanning energy is insufficient due to the large size of the patient. The adjustable birdcage coil can be set to a short leg mode to scan only a local part of the patient (i.e., a diseased part that needs to be scanned). That is, by sliding the first metal leg 130 and/or the second metal leg 230, the overlapping area generated by the first metal leg 130, the dielectric layer 300 and the second metal leg 230 is small and large. It will be appreciated that the adjustable birdcage coil can also be arranged in a pattern that coincides with the diseased part that the patient needs to scan.
In addition, the capacitance of the metal leg part of the body transmitting coil device is adjustable, so that an E field generated by the metal leg part is dispersed, the energy density is reduced, and the local SAR value generated during scanning is reduced.
In this embodiment, by providing the first birdcage coil 100 and the second birdcage coil 200 sleeved on the first birdcage coil 100, and by sliding the first birdcage coil 100 and/or the second birdcage coil 200 relative to the dielectric layer 300, the area of the overlapping region generated by the first metal leg 130, the dielectric layer 300, and the second metal leg 230 is changed. Further, the adjustable birdcage coil device that this application provided can be according to patient's size adjustment the overlap region area that first metal leg 130, dielectric layer 300 and second metal leg 230 produced, and then can adjust the magnetic field excitation area of whole body transmission coil device, and then the SAR value that the adjustment magnetic field produced and the power of the radio frequency power amplifier of consumption, the maximize is saving the resource, accomplishes the magnetic field excitation operation under the prerequisite that reduces the harm to the human body.
With continued reference to fig. 1, 2, and 3, in one embodiment of the present application, the radius of the first end ring 110 is equal to the radius of the second end ring 120. The radius of the third end ring 210 is equal to the radius of the fourth end ring 220.
Specifically, the radius of the first end ring 110 is equal to the radius of the second end ring 120, and the radius of the third end ring 210 is equal to the radius of the fourth end ring 220, so that the first birdcage coil 100 and the second birdcage coil 200 have regular cylindrical shapes, which are convenient for being implanted into a diseased part of a patient or the whole body of the patient.
In this embodiment, the radius of the first end ring 110 is equal to the radius of the second end ring 120. The radius of the third end ring 210 is equal to the radius of the fourth end ring 220, such that the body transmit coil apparatus of the present application is convenient for placement in a diseased site of a patient or throughout the body of a patient.
With continued reference to fig. 1, 2, and 3, in an embodiment of the present application, the radius of the first end ring 110 is less than or equal to the radius of the third end ring 210.
Specifically, the difference in radius between the first end ring 110 and the third end ring 210 is equal to the thickness of the dielectric layer 300. The thickness of the dielectric layer 300 is the length of the dielectric layer 300 in the radial extension direction of the first end ring 110. In this embodiment, the radius of the first end ring 110 is equal to the radius of the second end ring 120. The radius of the third end ring 210 is equal to the radius of the fourth end ring 220. It is understood that the difference in the radius of the first end ring 110 and the third end ring 210 is equal to the difference in the radius of the second end ring 120 and the fourth end ring 220.
In this embodiment, the dielectric layer 300 is embedded in the gap by setting the radius of the first end-ring 110 to be smaller than or equal to the radius of the third end-ring 210, so that the gap is generated between the first birdcage coil 100 and the second birdcage coil.
With continued reference to fig. 3, in an embodiment of the present application, the first metal leg 130 is perpendicular to the first end face 113 formed by the first end ring 110. The first metal leg 130 is perpendicular to the second end face 122 formed by the second end ring 120. The second metal leg 230 is perpendicular to the third end face 212 formed by the third end ring 210, and the second metal leg 230 is perpendicular to the fourth end face formed by the fourth end ring 220. The length of the first metal leg 130 is equal to the length of the second metal leg 230.
Specifically, the length of the first metal leg 130 may be equal to the length of the second metal leg 230. The length of the first metal leg 130 may not be equal to the length of the second metal leg 230. The first and second metal legs 130, 230 may be constructed of a wide copper sheet.
In this embodiment, the end surfaces formed by the metal legs and the end rings are perpendicular, and the length of the first metal leg 130 is equal to the length of the second metal leg 230, so that the complexity of the production process of the adjustable birdcage coil is reduced.
With continued reference to fig. 1, 2 and 3, in an embodiment of the present application, the dielectric layer 300 is cylindrical. The length of the dielectric layer 300 along the extending direction of the first metal leg 130 is equal to the length of the first metal leg 130.
Specifically, when the length of the first metal leg 130 is equal to the length of the second metal leg 230, the length of the dielectric layer 300 along the extending direction of the first metal leg 130 is equal to the length of the first metal leg 130, so as to ensure that the first metal leg 130 and/or the second metal leg 230 has the largest adjustable range of the overlapping area when sliding relative to the dielectric layer 300 and does not consume material. Similarly, when the length of the first metal leg 130 is not equal to the length of the second metal leg 230, the length of the dielectric layer 300 along the extending direction of the first metal leg 130 is greater than the length of the metal leg with the smaller length. If the length of the first metal leg 130 is smaller than the length of the second metal leg 230, the length of the dielectric layer 300 along the extending direction of the first metal leg 130 is greater than the length of the first metal leg 130.
In this embodiment, by setting the length of the dielectric layer 300 along the extending direction of the first metal leg 130 to be equal to the length of the first metal leg 130, when the first metal leg 130 and/or the second metal leg 230 slides relative to the dielectric layer 300, the adjustable range of the overlapping area is maximized and the material is not consumed.
In an embodiment of the present application, the number of the first metal legs 130 is equal to the number of the second metal legs 230. The number of the first metal legs 130 and the number of the second metal legs 230 are both integer multiples of 2.
Specifically, the first metal legs 130 are symmetrically distributed in the space formed between the first end ring 110 and the second end ring 120. The second metal legs 230 are symmetrically distributed in the space formed between the third end ring 210 and the fourth end ring 220. The number of the first metal legs 130 and the number of the second metal legs 230 are each an integer multiple of 2, so that the adjustable birdcage coil can form a uniform magnetic field.
In this embodiment, the number of the first metal legs 130 and the number of the second metal legs 230 are set so that the birdcage coil can be adjusted to form a uniform magnetic field.
In one embodiment of the present application, as shown in fig. 4, the dielectric layer 300 includes a plurality of sub-dielectric layers 310. The sub-dielectric layer 310 is disposed between one of the first metal legs 130 and one of the second metal legs 230 that are parallel and aligned with each other. The length of the sub-dielectric layer 310 along the extending direction of the first metal leg 130 is equal to the length of the first metal leg 130.
Specifically, the dielectric layer 300 may be disposed only between the first metal leg 130 and one of the second metal legs 230, and is not disposed at the non-metal leg portion, so as to save the dielectric material. The length of the sub-dielectric layer 310 along the extending direction of the first metal leg 130 is defined as the length of the cylindrical dielectric layer 300 along the extending direction of the first metal leg 130 in the previous embodiment.
In this embodiment, a plurality of sub-dielectric layers 310 are disposed between one first metal leg 130 and one second metal leg 230, so that dielectric materials are saved, and cost is greatly reduced.
As shown in fig. 5, in an embodiment of the present invention, the sub-dielectric layer 310 is fixedly disposed on the surface of the second metal leg 230. The first metal leg 130 can slide relative to the sub-dielectric layer 310.
In this embodiment, the sub-dielectric layer 310 is fixed. The second metal leg 230 and the sub-dielectric layer 310 may be considered as a single body. The first metal leg 130 can slide relative to the whole formed by the second metal leg 230 and the sub-dielectric layer 310.
The first metal leg 130 and the sub-dielectric layer 310 may have various sliding connection manners. Alternatively, as shown in fig. 6, the first metal leg 130 may be provided with a plurality of first latches 131. The plurality of first hooks 131 are distributed along the length direction of the first metal leg 130. The sub-medium layer 310 may be provided with a plurality of first card slots 311. The plurality of first card slots 311 are distributed along the height direction of the sub-medium layer 310. When the first metal leg 130 slides relative to the sub-dielectric layer 310, the first metal leg 130 may be engaged with the first engaging groove 311 by the first engaging buckle 131, so as to fixedly connect the first metal leg 130 and the sub-dielectric layer 310.
In this embodiment, the sub-dielectric layer 310 is fixedly disposed on the surface of the second metal leg 230, so that the first metal leg 130 can slide relative to the sub-dielectric layer 310. Further, the area of the overlapped region generated by the first metal leg 130, the sub-dielectric layer 310 and the second metal leg 230 is changed.
As shown in fig. 7, in an embodiment of the present invention, the sub-dielectric layer 310 is fixedly disposed on the surface of the first metal leg 130, and the second metal leg 230 can slide relative to the sub-dielectric layer 310.
Specifically, in the present embodiment, the sub-dielectric layer 310 is fixed. The first metal leg 130 and the sub-dielectric layer 310 may be considered as a single body. The second metal leg 230 can slide relative to the whole body formed by the second metal leg 230 and the sub-dielectric layer 310.
The second metal leg 230 and the sub-dielectric layer 310 may have various sliding connection manners. Optionally, with continued reference to fig. 7, the second metal leg 230 may be provided with a plurality of second latches 231. The plurality of second hooks 231 are distributed along the length direction of the second metal leg 230. The sub-medium layer 310 may be provided with a plurality of second card slots 312. The second card slots 312 are distributed along the height direction of the sub-medium layer 310. When the second metal leg 230 slides relative to the sub-dielectric layer 310, the second metal leg 230 may be engaged with the second engaging groove 312 through the second engaging hook 231, so as to fixedly connect the second metal leg 230 and the sub-dielectric layer 310.
In this embodiment, the sub-dielectric layer 310 is fixedly disposed on the surface of the first metal leg 130, so that the second metal leg 230 can slide relative to the sub-dielectric layer 310. Further, the area of the overlapped region generated by the first metal leg 130, the sub-dielectric layer 310 and the second metal leg 230 is changed.
As shown in fig. 8, in an embodiment of the present application, the first metal leg 130 and the second metal leg 230 may slide simultaneously relative to the sub-dielectric layer 310.
Specifically, the first metal leg 130 and the second metal leg 230 are both movable. The first metal leg 130 and the sub-dielectric layer 310 may have various sliding connection manners. The second metal leg 230 and the sub-dielectric layer 310 may have various sliding connection manners.
Alternatively, with continued reference to fig. 8, the first metal leg 130 may be provided with a plurality of third snaps 132. The plurality of third snaps 132 are distributed along the length of the first metal leg 130. The second metal leg 230 may be provided with a plurality of fourth catches 232. The plurality of fourth fasteners 232 are distributed along the length direction of the second metal leg 230. A plurality of third card slots 313 are formed on one side of the sub-dielectric layer 310 close to the first metal leg 130. The plurality of third card slots 313 are distributed along the height direction of the sub-medium layer 310. A plurality of fourth slots 314 are disposed on one side of the sub-dielectric layer 310 close to the second metal leg 230. The plurality of fourth card slots 314 are distributed along the height direction of the sub-dielectric layer 310.
When the first metal leg 130 and the second metal leg 230 slide relative to the sub-dielectric layer 310 at the same time, the first metal leg 130 is fastened with the third fastening groove 313 through the third fastener 132, so that the first metal leg 130 and the sub-dielectric layer 310 are fixedly connected. The second metal leg 230 is fastened with the fourth fastening groove 314 through the fourth fastening 232, so as to fixedly connect the second metal leg 230 and the sub-dielectric layer 310.
In this embodiment, the first metal leg 130 and the second metal leg 230 are arranged to slide relative to the sub-dielectric layer 310, so that the area of the overlapping region generated by the first metal leg 130, the sub-dielectric layer 310 and the second metal leg 230 is changed.
The technical features of the embodiments described above may 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 being within 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 express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present application. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present application shall be subject to the appended claims.
Claims (10)
1. A body transmit coil apparatus adapted for use in a magnetic resonance system, comprising a first birdcage coil (100) and a second birdcage coil (200) nested over the first birdcage coil (100);
the first birdcage coil (100) includes:
a first end ring (110) comprising at least two first sub-end rings (111), an adjustable capacitor (112) being arranged between the two first sub-end rings (111), the adjustable capacitor (112) having an adjustable capacitance value;
a second end-ring (120) arranged in parallel with the first end-ring (110), comprising at least two second sub-end-rings (121), the two second sub-end-rings (121) having the tunable capacitor (112) arranged therebetween;
a plurality of first metal legs (130) disposed between the first sub-end ring (111) and the second sub-end ring (121), one end of the first metal legs (130) being fixedly connected to the first end ring (110), the other end of the first metal legs (130) being fixedly connected to the second end ring (120);
the second birdcage coil (200) includes:
a third end ring (210) comprising at least two third sub-end rings (211), the two third sub-end rings (211) having the tunable capacitor (112) disposed therebetween;
a fourth end-ring (220) arranged in parallel with the third end-ring (210), comprising at least two fourth sub-end-rings (221), the two fourth sub-end-rings (221) having the tunable capacitor (112) arranged therebetween;
a plurality of second metal legs (230) disposed between the third sub-end ring (211) and the third sub-end ring (211), one end of the second metal legs (230) being fixedly connected to the third end ring (210), the other end of the second metal legs (230) being fixedly connected to the fourth end ring (220);
the first metal leg (130) and the second metal leg (230) are parallel to each other and arranged side by side;
a dielectric layer (300) is disposed between the first birdcage coil (100) and the second birdcage coil (200), and the first birdcage coil (100) and/or the second birdcage coil (200) can slide relative to the dielectric layer (300), so that an area of an overlapping region generated by the first metal leg (130), the dielectric layer (300), and the second metal leg (230) is changed.
2. The body transmit coil apparatus of claim 1, wherein a radius of the first end ring (110) is equal to a radius of the second end ring (120), and a radius of the third end ring (210) is equal to a radius of the fourth end ring (220).
3. The body transmit coil apparatus of claim 2, wherein a radius of the first end ring (110) is less than or equal to a radius of the third end ring (210).
4. The body transmit coil apparatus of claim 3, wherein the first metal leg (130) is perpendicular to a first end face (113) formed by the first end ring (110) and the first metal leg (130) is perpendicular to a second end face (122) formed by the second end ring (120);
the second metal leg (230) is perpendicular to a third end face (212) formed by the third end ring (210), and the second metal leg (230) is perpendicular to a fourth end face (222) formed by the fourth end ring (220);
the length of the first metal leg (130) is equal to the length of the second metal leg (230).
5. The body transmit coil apparatus of claim 4, wherein the dielectric layer (300) is cylindrical, and a length of the dielectric layer (300) along an extension direction of the first metal leg (130) is equal to a length of the first metal leg (130).
6. The body transmit coil apparatus of claim 4, wherein the number of the first metal legs (130) is equal to the number of the second metal legs (230), and the number of the first metal legs (130) and the number of the second metal legs (230) are each an integer multiple of 2.
7. The body transmit coil apparatus of claim 6, wherein the dielectric layer (300) comprises a plurality of sub-dielectric layers (310), the sub-dielectric layers (310) being disposed between one of the first metal legs (130) and one of the second metal legs (230) disposed in parallel and aligned with each other; the length of the sub-dielectric layer (310) along the extending direction of the first metal leg (130) is equal to the length of the first metal leg (130).
8. The body transmit coil apparatus of claim 7, wherein the sub-dielectric layer (310) is fixedly disposed on a surface of the second metal leg (230), and the first metal leg (130) is slidable relative to the sub-dielectric layer (310).
9. The body transmit coil apparatus of claim 7, wherein the sub-dielectric layer (310) is fixedly disposed on a surface of the first metal leg (130), and the second metal leg (230) is slidable relative to the sub-dielectric layer (310).
10. The body transmit coil apparatus of claim 7, wherein the first metal leg (130) and the second metal leg (230) are simultaneously slidable relative to the sub-dielectric layer (310).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920805633.8U CN210401637U (en) | 2019-05-30 | 2019-05-30 | Body transmitting coil apparatus |
Applications Claiming Priority (1)
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| CN117054940A (en) * | 2023-08-15 | 2023-11-14 | 浙江大学 | Multi-core detection coil assembly for magnetic resonance imaging |
| CN117054940B (en) * | 2023-08-15 | 2024-03-26 | 浙江大学 | Multi-core detection coil assembly for magnetic resonance imaging |
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