CN113552515A - Dual-core imaging method for animal magnetic resonance imaging - Google Patents
Dual-core imaging method for animal magnetic resonance imaging Download PDFInfo
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- CN113552515A CN113552515A CN202110730086.3A CN202110730086A CN113552515A CN 113552515 A CN113552515 A CN 113552515A CN 202110730086 A CN202110730086 A CN 202110730086A CN 113552515 A CN113552515 A CN 113552515A
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- G—PHYSICS
- 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
- G01R33/28—Details of apparatus provided for in groups G01R33/44 - G01R33/64
- G01R33/32—Excitation or detection systems, e.g. using radio frequency signals
- G01R33/34—Constructional details, e.g. resonators, specially adapted to MR
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- G—PHYSICS
- 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
- G01R33/28—Details of apparatus provided for in groups G01R33/44 - G01R33/64
- G01R33/32—Excitation or detection systems, e.g. using radio frequency signals
- G01R33/36—Electrical details, e.g. matching or coupling of the coil to the receiver
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Abstract
The invention relates to the technical field of magnetic resonance, in particular to a dual-core imaging method for animal magnetic resonance imaging. A dual-core imaging method for animal magnetic resonance imaging comprises the following specific steps: the method comprises the following steps: placing a scanned object in a radio frequency coil system to be scanned, wherein the radio frequency coil system is a three-layer radio frequency coil system; step two: carrying out 1H magnetic resonance imaging on an object to be scanned by utilizing a receiving and transmitting shared radio frequency coil on the outer layer of the radio frequency coil system; step three: according to the 1H magnetic resonance imaging image, selecting an area needing further imaging, closing the transmitting and receiving shared radio frequency coil on the outer layer, transmitting by using the radio frequency transmitting coil on the middle layer, receiving by using the phased array radio frequency receiving coil on the inner layer, and acquiring the image of the further imaging area; step four: the final magnetic resonance imaged image is analyzed. Compared with the prior art, the magnetic resonance imaging of two different atomic nuclei is realized by adopting the radio frequency coil system with a three-layer structure.
Description
Technical Field
The invention relates to the technical field of magnetic resonance, in particular to a dual-core imaging method for animal magnetic resonance imaging.
Background
The nuclear magnetic resonance principle is mainly caused by the spin motion of the nuclei. When the atomic nucleus contains a single hydrogen atom or a single neutron or both, the atomic nucleus is charged with static electricity, such as 1H, 13C, 31P, 19F, 23Na and the like, and the atomic nucleus can generate a magnetic resonance signal.
Since the resonance frequencies of each nucleus that can generate a magnetic resonance signal are different at the same magnetic field strength, the resonance frequencies of 1H and 31P nuclei at 1T magnetic field strength are 42.577Mhz and 17.235Mhz, respectively, for example. Thus, different nuclei need to be imaged, requiring radio frequency transmit and receive coils of different frequencies.
The application of nuclear magnetic resonance imaging is limited to hydrogen nuclei (1H) at present, but from the requirement of practical application, nuclear magnetic resonance imaging can be carried out on other nuclei such as 13C, 31P, 33S, 23Na and the like. For example for 23Na magnetic resonance imaging. Sodium ion batteries are of great interest due to their low cost and sustainability advantages. This has led to an increasing interest in developing new sodium ion batteries and new analytical methods that allow for non-invasive, direct visualization of the battery chemistry. The sodium ion magnetic resonance imaging can non-invasively detect the concentration and the distribution condition of sodium ions in biological tissues, thereby providing direct and quantitative biochemical information for clinic to judge the viability of the tissues, the integrity of cells and the functions thereof, and being beneficial to the diagnosis, the curative effect evaluation and the prognosis of diseases.
Generally, a double-tuned radio frequency coil is adopted to realize magnetic resonance imaging of 2 different atomic nuclei, but the structure of the double-tuned radio frequency coil is complex, and the design, manufacture and debugging difficulty of the double-tuned radio frequency coil is high. Moreover, the double-tuned radio frequency coil can only be used for the magnetic resonance imaging of fixed 2 atomic nuclei (such as 1H and 23 Na), and if the magnetic resonance imaging of hydrogen atoms and another atomic nucleus (such as 31P) is to be carried out, a complete double-tuned radio frequency coil needs to be manufactured again.
Disclosure of Invention
The invention provides a dual-core imaging method for animal magnetic resonance imaging, which overcomes the defects of the prior art and adopts a radio frequency coil system with a three-layer structure to realize the magnetic resonance imaging of two different atomic nuclei.
In order to achieve the above object, a dual core imaging method for animal magnetic resonance imaging is designed, which includes a radio frequency coil system, and is characterized in that: the specific method comprises the following steps:
the method comprises the following steps: placing a scanned object in a radio frequency coil system to be scanned, wherein the radio frequency coil system is a three-layer radio frequency coil system;
step two: carrying out 1H magnetic resonance imaging on an object to be scanned by utilizing a receiving and transmitting shared radio frequency coil on the outer layer of the radio frequency coil system;
step three: according to the 1H magnetic resonance imaging image, selecting an area needing further imaging, closing the transmitting and receiving shared radio frequency coil on the outer layer, transmitting by using the radio frequency transmitting coil on the middle layer, receiving by using the phased array radio frequency receiving coil on the inner layer, and acquiring the image of the further imaging area;
step four: analyzing the final magnetic resonance imaging image;
the further imaging is one of 23Na magnetic resonance imaging, 13C magnetic resonance imaging, 15N magnetic resonance imaging, 17O magnetic resonance imaging, 19F magnetic resonance imaging, 31P magnetic resonance imaging, 33S magnetic resonance imaging, 39K magnetic resonance imaging.
The radio frequency coil system comprises a receiving and transmitting shared radio frequency coil, a radio frequency transmitting coil and a phased array radio frequency receiving coil, wherein the radio frequency transmitting coil is sleeved on the outer side of the phased array radio frequency receiving coil, and the receiving and transmitting shared radio frequency coil is sleeved on the outer side of the radio frequency transmitting coil.
The receiving and transmitting shared radio frequency coil is a radio frequency coil with a birdcage structure.
The radio frequency transmitting coil is a radio frequency transmitting coil with a birdcage structure.
The radio frequency transmitting coil is one of a 1H radio frequency transmitting coil, a 23Na radio frequency transmitting coil, a 13C radio frequency transmitting coil, a 15N radio frequency transmitting coil, a 17O radio frequency transmitting coil, a 19F radio frequency transmitting coil, a 31P radio frequency transmitting coil, a 33S radio frequency transmitting coil and a 39K radio frequency transmitting coil.
The imaging principle of the radio frequency transmitting coil is matched with that of the phased array radio frequency receiving coil.
The phased array radio frequency receiving coil is an 8-32 channel phased array radio frequency receiving coil.
The object to be scanned is a small animal selected from mice, rabbits, cats and dogs.
Compared with the prior art, the invention provides a dual-core imaging method for animal magnetic resonance imaging, which adopts a radio frequency coil system with a three-layer structure to realize the magnetic resonance imaging of two different atomic nuclei.
The radio frequency coils of the middle layer and the inner layer can be replaced under the condition that the radio frequency coil of the outer layer is not changed, so that different atomic nuclei can be conveniently imaged, and a complete radio frequency coil system does not need to be manufactured again.
Drawings
FIG. 1 is a schematic diagram of a RF coil system according to the present invention.
Fig. 2 is a schematic cross-sectional view of a radio frequency coil system according to the present invention.
Referring to fig. 1, fig. 2, 1 is a common radio frequency coil for transmitting and receiving, 2 is a radio frequency transmitting coil, and 3 is a phased array radio frequency receiving coil.
Detailed Description
The invention is further illustrated below with reference to the accompanying drawings.
As shown in fig. 1 and fig. 2, a dual core imaging method for animal magnetic resonance imaging is a specific method of the structure of a radio frequency coil system, which is as follows:
the method comprises the following steps: placing a scanned object in a radio frequency coil system to be scanned, wherein the radio frequency coil system is a three-layer radio frequency coil system;
step two: carrying out 1H magnetic resonance imaging on an object to be scanned by utilizing a receiving and transmitting shared radio frequency coil on the outer layer of the radio frequency coil system;
step three: according to the 1H magnetic resonance imaging image, selecting an area needing further imaging, closing the transmitting and receiving shared radio frequency coil on the outer layer, transmitting by using the radio frequency transmitting coil on the middle layer, receiving by using the phased array radio frequency receiving coil on the inner layer, and acquiring the image of the further imaging area;
step four: analyzing the final magnetic resonance imaging image;
the further imaging is one of 23Na magnetic resonance imaging, 13C magnetic resonance imaging, 15N magnetic resonance imaging, 17O magnetic resonance imaging, 19F magnetic resonance imaging, 31P magnetic resonance imaging, 33S magnetic resonance imaging, 39K magnetic resonance imaging.
As shown in fig. 1 and fig. 2, the radio frequency coil system includes a common radio frequency receiving and transmitting coil, a radio frequency transmitting coil, and a phased array radio frequency receiving coil, the radio frequency transmitting coil 2 is sleeved outside the phased array radio frequency receiving coil 3, and the common radio frequency receiving and transmitting coil 1 is sleeved outside the radio frequency transmitting coil 2.
The receiving and transmitting shared radio frequency coil is a radio frequency coil with a birdcage structure.
The radio frequency transmitting coil is a radio frequency transmitting coil with a birdcage structure.
The radio frequency transmitting coil is one of a 1H radio frequency transmitting coil, a 23Na radio frequency transmitting coil, a 13C radio frequency transmitting coil, a 15N radio frequency transmitting coil, a 17O radio frequency transmitting coil, a 19F radio frequency transmitting coil, a 31P radio frequency transmitting coil, a 33S radio frequency transmitting coil and a 39K radio frequency transmitting coil.
The radio frequency transmitting coil 2 is matched with the imaging principle of the phased array radio frequency receiving coil 3.
The phased array radio frequency receiving coil 3 is an 8-to-32-channel phased array radio frequency receiving coil.
The object to be scanned is a small animal selected from mouse, rabbit, cat and dog.
The invention adopts a radio frequency coil system with a three-layer structure to realize the magnetic resonance imaging of two different atomic nuclei. The whole radio frequency coil system is divided into three layers, and the outer layer is a transmitting and receiving common radio frequency coil 1 which is used for conventional hydrogen atom (1H) imaging. The middle layer is a radio frequency transmission coil 2 for the radio frequency transmission coil of another nucleus (e.g. 23 Na). The inner layer employs a phased array radio frequency receive coil 3 (e.g. an 8-channel phased array radio frequency receive coil) for magnetic resonance signal radio frequency receive coils of nuclei (e.g. 23 Na) excited by the middle layer.
In working, firstly, the outer layer of the transmitting and receiving common radio frequency coil 1 is used for carrying out 1H magnetic resonance imaging on the animal to be scanned. Because the water content of the organism is different with the different types of organisms, generally 60% -95%, the hydrogen atom content in the organism is very high. In a short time, a clear magnetic resonance image of the hydrogen atoms can be obtained. Then, based on the hydrogen atom magnetic resonance image, a region to be imaged by another nucleus (for example, 23 Na) is selected. Then, the nuclear magnetic resonance imaging system transmits by using a radio frequency transmitting coil 2 at the middle layer, receives by using a phased array radio frequency receiving coil 3 at the inner layer, and acquires a magnetic resonance image of another atomic nucleus in the interested area. Since the magnetic resonance signal of 23Na in a living body is much smaller than 1H, it takes a long time to scan and obtain a clear 23Na magnetic resonance image. If the outer-layer receiving and transmitting common radio frequency coil 1 does not exist for rapidly scanning and positioning the animal to be scanned, the 23Na magnetic resonance signal acquisition is directly carried out, and whether the scanning area is correct or not can be determined after long-time scanning. If not, the position and posture of the animal is adjusted, and a lot of precious magnetic resonance machine time is spent.
The three-layer structure of the radio frequency coil system with the three-layer structure can be separated. The radio frequency transmitting coil 2 at the middle layer and the phased array radio frequency receiving coil 3 at the inner layer can be replaced under the condition that the outer layer receiving and transmitting common radio frequency coil 1 is not changed, so that different atomic nuclei can be conveniently imaged without remanufacturing a complete radio frequency coil system.
Example (b): as shown in fig. 1, it is a three-layer structure of a radio frequency coil system for magnetic resonance imaging of two different nuclei (1H and 23 Na) in a 7.0T animal magnetic resonance imaging system.
Wherein, the receiving and transmitting common radio frequency coil 1 of the birdcage structure is used for the magnetic resonance imaging of hydrogen atoms, the radio frequency transmitting coil 2 of the birdcage structure is used for the radio frequency of 23Na, and the phased array radio frequency receiving coil 3 of 8 channels is used for the signal reception of 23 Na.
The operating frequency of the radio frequency coil 1 for transmitting and receiving of the birdcage structure is set to 298.06MHz (magnetic resonance frequency of 1H at 7.0T magnetic field strength), and the operating frequencies of the radio frequency transmitting coil 2 of the birdcage structure and the phased array radio frequency receiving coil 3 of the 8-channel are both set to 78.89MHz (magnetic resonance frequency of 23Na at 7.0T magnetic field strength).
In practical use, an animal to be scanned is placed in the central position of the radio frequency coil system with the three-layer structure, and then the whole system is placed in a 7.0T animal magnetic resonance imaging system. The frequency of a radio frequency system of the magnetic resonance system is set to be 298.06MHz, a receiving and transmitting common radio frequency coil 1 of a birdcage structure is used for transmitting and receiving magnetic resonance signals, the animal to be scanned is scanned, and then the whole hydrogen atom magnetic resonance image of the region to be scanned can be obtained. The region of interest can then be selected by moving the animal forward, backward, left, and right so that the region requiring the 23Na magnetic resonance scan is centered in the imaging region of the entire magnetic resonance imaging system.
Then, the transmitting and receiving common radio frequency coil 1 of the outer birdcage structure is disconnected, and the radio frequency transmitting coil 2 of the intermediate birdcage structure and the phased array radio frequency receiving coil 3 of the inner 8 channels are connected to the magnetic resonance imaging system.
Then the frequency of the radio frequency system is set to 78.89MHz, a radio frequency excitation signal of 298.06MHz is transmitted by a radio frequency transmitting coil 2 of a birdcage structure, and an excited magnetic resonance signal is received by a phased array radio frequency receiving coil 3 of 8 channels.
The radio frequency uniformity of the radio frequency coil transmission of the birdcage structure is good, and the defects of the birdcage structure are that the signal-to-noise ratio of the received signals is poor, the parallel acquisition cannot be carried out, and the imaging speed is slow, so the birdcage structure is used as a radio frequency transmitting coil of 23 Na. Meanwhile, the phased array receiving coil which has high signal-to-noise ratio and can independently transmit signals by each coil unit, forms multi-channel transmission and can be parallelly acquired so as to greatly improve the scanning speed is used for acquiring the 23Na magnetic resonance signals.
In order to study 31P magnetic resonance imaging of animals, a birdcage rf transmit coil 2 and an 8-channel phased array rf receive coil 3 are separately fabricated with the birdcage rf transmit coil 1 unchanged, and their operating frequencies are set to 120.75MHz (31P magnetic resonance frequency at 7.0T magnetic field strength). The same method can be used to perform 1H and 31P magnetic resonance imaging by replacing the intermediate and inner coils in the 1H and 23Na radio frequency coil system.
Claims (8)
1. A method for dual core imaging for magnetic resonance imaging of animals, comprising a radio frequency coil system, characterized by: the specific method comprises the following steps:
the method comprises the following steps: placing a scanned object in a radio frequency coil system to be scanned, wherein the radio frequency coil system is a three-layer radio frequency coil system;
step two: carrying out 1H magnetic resonance imaging on an object to be scanned by utilizing a receiving and transmitting shared radio frequency coil on the outer layer of the radio frequency coil system;
step three: according to the 1H magnetic resonance imaging image, selecting an area needing further imaging, closing the transmitting and receiving shared radio frequency coil on the outer layer, transmitting by using the radio frequency transmitting coil on the middle layer, receiving by using the phased array radio frequency receiving coil on the inner layer, and acquiring the image of the further imaging area;
step four: analyzing the final magnetic resonance imaging image;
the further imaging is one of 23Na magnetic resonance imaging, 13C magnetic resonance imaging, 15N magnetic resonance imaging, 17O magnetic resonance imaging, 19F magnetic resonance imaging, 31P magnetic resonance imaging, 33S magnetic resonance imaging, 39K magnetic resonance imaging.
2. A method of dual core imaging for animal magnetic resonance imaging according to claim 1, characterized in that: the radio frequency coil system comprises a transceiving shared radio frequency coil, a radio frequency transmitting coil and a phased array radio frequency receiving coil, wherein the radio frequency transmitting coil (2) is sleeved on the outer side of the phased array radio frequency receiving coil (3), and the transceiving shared radio frequency coil (1) is sleeved on the outer side of the radio frequency transmitting coil (2).
3. A method of dual core imaging for animal magnetic resonance imaging according to claim 2, characterized in that: the receiving and transmitting shared radio frequency coil is a radio frequency coil with a birdcage structure.
4. A method of dual core imaging for animal magnetic resonance imaging according to claim 2, characterized in that: the radio frequency transmitting coil is a radio frequency transmitting coil with a birdcage structure.
5. Method of dual nuclear imaging for magnetic resonance imaging of animals according to claim 2 or 4, characterized in that: the radio frequency transmitting coil is one of a 1H radio frequency transmitting coil, a 23Na radio frequency transmitting coil, a 13C radio frequency transmitting coil, a 15N radio frequency transmitting coil, a 17O radio frequency transmitting coil, a 19F radio frequency transmitting coil, a 31P radio frequency transmitting coil, a 33S radio frequency transmitting coil and a 39K radio frequency transmitting coil.
6. The method of dual core imaging for animal magnetic resonance imaging according to claim 5, wherein: the radio frequency transmitting coil (2) is matched with the imaging principle of the phased array radio frequency receiving coil (3).
7. A method of dual core imaging for animal magnetic resonance imaging according to claim 2, characterized in that: the phased array radio frequency receiving coil (3) is an 8-to-32-channel phased array radio frequency receiving coil.
8. A method of dual core imaging for animal magnetic resonance imaging according to claim 1, characterized in that: the object to be scanned is a small animal selected from mice, rabbits, cats and dogs.
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