KR102073082B1 - Multi-channel coaxial loop array magnetic resonance imaging radio frequency coil structure attached to the thermoplastic sheet for fixation, a magnetic resonance imaging apparatus comprising the same and a method for producing magnetic resonance imaging using the same - Google Patents

Abstract

The present invention relates to a coaxial coil structure and a magnetic resonance imaging apparatus including the same. The present invention is in the form of a surface formed with a plurality of openings before deformation, the sheet having a plasticity so as to surround the inspection site of the inspector when deformed, and plastic deformation so as to be in close contact with the inspection site of the inspector deformed in accordance with the deformation of the sheet And a coaxial coil intertwined with the sheet through the plurality of openings, and a magnetic resonance imaging apparatus including the coaxial coil structure.

Description

Multi-channel coaxial loop array magnetic resonance imaging RF coil structure attached to a fixed thermoplastic plastic sheet, magnetic resonance imaging apparatus comprising the same and a method for generating a magnetic resonance image using the same {multi-channel coaxial loop array magnetic resonance imaging radio frequency coil structure attached to the thermoplastic sheet for fixation, a magnetic resonance imaging apparatus comprising the same and a method for producing magnetic resonance imaging using the same}

The present invention relates to a coil of a magnetic resonance imaging apparatus, and more particularly, to a device for positioning closest to a patient's skin with a fixing thermoplastic sheet and a coaxial loop coil structure inserted in the apparatus, and magnetic resonance imaging comprising the same. An apparatus and a method of generating a magnetic resonance image using the same.

Magnetic resonance imaging (MRI) is a technique that uses magnetic resonance phenomena to perform imaging. The principle of magnetic resonance phenomena involves protons becoming spin-like in a nucleus containing a single proton, such as hydrogen nuclei, which are present throughout the human body, resembling small magnets.

In addition, these spin axes do not have a distinct regular pattern, and when an external magnetic field is applied, these small magnets will be rearranged according to the magnetic field lines of the external magnetic field. Specifically, they will be rearranged in two directions, parallel or anti-parallel, with respect to the magnetic field lines of the external magnetic field. The nucleus has only a longitudinal magnetization component, which has both a direction and a magnitude.

As a specific frequency (RF) pulse is used to excite the nuclei in an external magnetic field, the spin axes of these nuclei deviate from the positive or negative longitudinal axis, causing resonance. This is a magnetic resonance phenomenon.

Once the spin axis of the nucleus deviates from the positive or negative longitudinal axis, the atomic nucleus has a transverse magnetization component. After the transmission of the RF pulses is stopped, the excited nuclei emit magnetic resonance signals, gradually releasing absorbed energy in the form of electromagnetic waves, and their phase and energy levels are all returned to the pre-excitation state. . The image can be reconstructed by performing additional processing such as spatial encoding on the magnetic resonance signal emitted by the atomic nucleus.

Korean Laid-Open Patent Publication No. 2012-0015580 Feb. 22, 2012 (Name: RF coil used in magnetic resonance imaging apparatus)

Disclosure of Invention An object of the present invention is to provide a device for positioning closest to a patient's skin with a fixed thermoplastic sheet having improved signal-to-noise ratio (SNR) characteristics, a coaxial loop coil inserted in the device, a magnetic resonance imaging apparatus using the same, and magnetic It provides a method for generating a resonance image.

Coaxial coil structure for acquiring the magnetic resonance image according to a preferred embodiment of the present invention for achieving the above object is a surface form having a plurality of openings before deformation, so as to wrap close to the inspection site of the inspector during deformation And a sheet having a plasticity and a coaxial coil deformed according to the deformation of the sheet to have a plasticity to be in close contact with the inspection site of the inspector and to be entangled with the sheet through the plurality of openings.

The coaxial coil is coupled in a tangled form to the sheet, characterized in that the close contact with the inspection site of the inspector to form a plurality of loops.

At least one of the loops and the other loop of the plurality of loops are characterized in that at least a portion overlaps at the inspection site of the inspector.

Any one loop and the other loop of the plurality of loops may be formed to face each other in a horizontal cross section in the direction of the static field of the inspection site.

When there is a central axis penetrating the center of gravity of the vertical section in the direction of the static field of the test site in the direction of the static field, any one loop and the other loop of the plurality of loops refer to the direction of the static field direction of the test site. It is characterized in that it is formed to pass through the position of 170 to 190 degrees axisymmetric.

The coaxial coil is characterized in that the coaxial cable including a coaxial center conductor and an insulator surrounding the center conductor.

The coaxial coil further includes an outer conductor surrounding the insulator and an outer insulator surrounding the outside of the outer conductor.

The sheet has plasticity when applied with heat above a predetermined first temperature and is solidified below a predetermined second temperature lower than the first temperature.

The coaxial coil structure further includes a peripheral circuit including a detuning circuit and a tuning circuit connected to the coaxial coil.

The detuning circuit includes a passive detuning circuit, wherein the passive detuning circuit includes a first capacitor, a second capacitor, a first variable capacitor, a first inductor, and a cross diode, and the first capacitor and the second capacitor. And each of the first inductors is connected in parallel, the first variable capacitor is connected in series with the first capacitor, and the cross diode is connected in series with the first inductor.

The detuning circuit comprises an active detuning circuit, the active detuning circuit including a fifth capacitor, a sixth capacitor, a diode, and a second inductor, wherein the fifth capacitor and the sixth capacitor are connected in series The diode is connected in parallel with the sixth capacitor, and the second inductor is connected in series with the diode.

The tuning circuit includes a second variable capacitor and a third capacitor, wherein the second variable capacitor and the third capacitor are connected in parallel.

Magnetic resonance imaging apparatus according to a preferred embodiment of the present invention for achieving the above object is a magnet, a gradient magnetic field coil, a sheet formed with a plurality of openings in close contact while wrapping the inspection site of the inspector, and A magnetic field is formed around the inspector through a coaxial coil structure including a coaxial coil intertwined with the sheet through a plurality of openings, a peripheral circuit connected to the coaxial coil, and the magnet and the gradient magnetic coil. And radiating electromagnetic waves to the inspection site of the inspector through the coaxial coil, receiving magnetic resonance signals generated from the inspection site by the radiated electromagnetic waves through the coaxial coil, and receiving magnetic resonance signals from the received magnetic resonance signals. And a control unit constituting the image.

The sheet has plasticity when applied with heat above a predetermined first temperature and is solidified below a predetermined second temperature lower than the first temperature.

Magnetic resonance imaging method of the magnetic resonance imaging apparatus according to a preferred embodiment of the present invention for achieving the object as described above comprises the steps of forming a magnetic field around the inspector, and radiating an electromagnetic wave to the inspection site of the inspector; Acquiring a magnetic resonance signal generated from the inspection portion by the radiated electromagnetic waves through a coaxial coil formed by being entangled in a tightly adhered sheet while surrounding the inspection portion; and obtaining a magnetic resonance image from the obtained magnetic resonance signal. Configuring.

The sheet has plasticity when applied with heat above a predetermined first temperature and is solidified below a predetermined second temperature lower than the first temperature.

According to the present invention, since the coaxial coil can be formed in close contact with the inspection site of the inspector through the sheet, the SNR characteristic of the magnetic resonance signal received through the coaxial coil can be improved.

1 is a block diagram illustrating a magnetic resonance imaging apparatus according to an exemplary embodiment of the present invention.
2 is a view for explaining a coaxial coil structure according to an embodiment of the present invention.
3 and 4 are views for explaining a thermoplastic sheet for attaching a coaxial coil according to an embodiment of the present invention.
5 is a view for explaining a coaxial coil for a loop configuration according to an embodiment of the present invention.
6 and 7 are views for explaining the coupling structure of the thermoplastic sheet and the coaxial coil according to an embodiment of the present invention.
8 is a diagram illustrating a peripheral circuit of a coaxial coil structure according to an exemplary embodiment of the present invention.
9 to 11 are diagrams for explaining a plurality of loops formed through a plurality of coaxial coil structures according to an embodiment of the present invention.
12 to 14 are views for explaining an arrangement of coaxial coils forming a plurality of loops according to an embodiment of the present invention.
15 is a flowchart illustrating a method of generating a magnetic resonance image of a magnetic resonance imaging apparatus including a coaxial coil structure according to an exemplary embodiment of the present invention.

Prior to the description of the present invention, the terms or words used in the specification and claims described below should not be construed as being limited to the ordinary or dictionary meanings, the inventors in their best way For the purpose of explanation, it should be interpreted as meaning and concept corresponding to the technical idea of the present invention on the basis of the principle that it can be appropriately defined as the concept of term. Therefore, the embodiments described in the present specification and the configuration shown in the drawings are only the most preferred embodiments of the present invention, and do not represent all of the technical ideas of the present invention, and various equivalents may be substituted for them at the time of the present application. It should be understood that there may be water and variations.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In this case, it should be noted that like elements are denoted by like reference numerals as much as possible. In addition, detailed descriptions of well-known functions and configurations that may blur the gist of the present invention will be omitted. For the same reason, some components in the accompanying drawings are exaggerated, omitted, or schematically illustrated, and the size of each component does not entirely reflect the actual size.

First, a magnetic resonance imaging (MRI) apparatus 10 according to an embodiment of the present invention will be described. 1 is a block diagram illustrating a magnetic resonance imaging apparatus according to an exemplary embodiment of the present invention. Referring to FIG. 1, a magnetic resonance imaging apparatus 10 according to an exemplary embodiment of the present invention may include a magnet 100, a gradient magnetic field coil 200, a coaxial coil structure 300, an input unit 400, a display unit 500, and the like. The control unit 600 is included.

The magnet 100 includes a main magnetic coil (not shown), and forms a static magnetic field in the measurement space in which the inspector 1 is disposed. The magnetic resonance imaging apparatus 10 may be classified into a horizontal magnetic field method and a vertical magnetic field method by the direction of the static magnetic field formed by the magnet 100. In the case of the horizontal magnetic field method, generally, the magnet 100 has a hollow cylindrical bore and is disposed in the hollow cylindrical shape to generate a static magnetic field in the horizontal direction (the Z-axis direction of the coordinate system of FIG. 1). On the other hand, in the case of the vertical magnetic field method, the pair of magnets positions the examiner 1 in between. That is, a pair of magnets are arranged above and below the inspector 1 to generate a static magnetic field in the up-down direction (Y-axis direction of the coordinate system of FIG. 1). In the embodiment of the present invention will be described based on the horizontal magnetic field method, those skilled in the art will be able to apply the technical spirit of the present invention to the vertical magnetic field method.

Gradient coil 200 is a magnet 100 along three axes (x, y, z axis) orthogonal to each other, ie, slice axis, phase axis and frequency axis, which are orthogonal to each other under the control of the controller 60. Generate three gradient magnetic fields that cause the static magnetic field generated by To generate the gradient magnetic field, the gradient coil 200 is composed of three. Under the control of the controller 600, the gradient magnetic field coil 200 is driven to generate the gradient magnetic field. The gradient magnetic field whose direction corresponds to the direction of the slice axis is called the slicing gradient magnetic field, the gradient magnetic field whose direction corresponds to the direction of the phase axis is called the phase encoding gradient magnetic field, and the gradient magnetic field whose direction corresponds to the direction of the frequency axis is read as the gradient magnetic field ( Or frequency encoded gradient magnetic field). If the coordinate axes in the Cartesian coordinate system defined in three-dimensional space are associated with mutually orthogonal axes in the space of the static field, and that is the X, Y, and Z axes, then any of the X, Y, and Z axes can be considered as the slice axis. have. In the present embodiment, the slice axis can be aligned with the body axis of the photographing object 1, and is regarded as the Z axis. One of the other two axes is the phase axis and the other axis is the frequency axis. In addition, the slice axis, the phase axis, and the frequency axis can be inclined at any inclination with respect to the X, Y, and Z axes while maintaining mutual orthogonality.

The coaxial coil structure 300 includes a sheet 310, a coaxial coil 320, and a peripheral circuit 330. Sheet 310 and the coaxial coil 320 according to the embodiment of the present invention has a plasticity to be formed in close contact with the inspection site of the inspector (1).

The coaxial coil (or radio frequency (RF) coil) 320 is a high frequency magnetic field that is used to excite the spin to the inspection site of the inspector 1 in a state in which a gradient magnetic field is formed in the static magnetic field space under the control of the controller 600. Emits electromagnetic waves (RF signals) to form. In addition, the coaxial coil 320 receives an electromagnetic wave generated by the spin excited from the inspection site of the inspector 1, that is, a magnetic resonance (MR) signal, and transmits it to the control unit 600.

Coaxial coil 320 according to an embodiment of the present invention is composed of a transmission (Tx) coaxial coil for emitting electromagnetic waves and a reception (Rx) coaxial coil for receiving a magnetic resonance signal, or a transmission (Tx) coaxial coil and reception ( Rx) The coaxial coils can be configured separately. When the transmission (Tx) coaxial coil and the reception (Rx) coaxial coil are configured as one, the coaxial coil 320 may perform all functions of emitting electromagnetic waves and receiving a magnetic resonance signal. On the other hand, in the case where the transmit (Tx) coaxial coil and the receive (Rx) coaxial coil are configured separately, the coaxial coil 320 described in the embodiment of the present invention becomes a receive (Rx) coaxial coil and a receive (Rx) coaxial A transmission (Tx) coaxial coil is disposed outside the coaxial coil 320 which is a coil.

The controller 600 may control an overall operation of the magnetic resonance imaging apparatus 10 and control a signal flow between internal blocks of the magnetic resonance imaging apparatus 10 and perform a data processing function for processing data. The controller 600 may include at least one of a central processing unit (CPU), an application processor, and a graphic processing unit (GPU).

The controller 600 allows the gradient magnetic field coil 200 to form a gradient magnetic field in a state in which the magnet 100 forms a static magnetic field, causes the coaxial coil 320 to radiate electromagnetic waves, and controls the coaxial coil 320. Receives a magnetic resonance signal generated from the inspection site of the inspector (1) through. Then, the controller 600 generates a magnetic resonance image in the form of digital data from the magnetic resonance signal. The acquired magnetic resonance signal may be a signal defined in the frequency domain, for example, Fourier space. The controller 600 encodes the distribution of the source of the magnetic resonance signal along two axes to which a gradient magnetic field whose direction corresponds to the phase axis direction and the frequency axis direction is applied. For example, when the Fourier space is adopted as the frequency domain, the magnetic resonance signal is provided as a signal defined in the two-dimensional Fourier space. The two-dimensional Fourier space may be referred to as k space. Accordingly, the controller 600 may determine the position of the sampled signal in the two-dimensional Fourier space through the phase encoding gradient magnetic field and the frequency encoding gradient magnetic field.

The input unit 400 receives a key operation of a user for controlling the magnetic resonance imaging apparatus 10, generates an input signal, and transmits the generated input signal to the controller 600. The input unit 400 may include various keys for controlling the magnetic resonance imaging apparatus 10. When the display unit 500 includes a touch screen, the input unit 400 may perform functions of various keys on the display unit 500. When the input unit 400 may perform all functions using only the touch screen, the input unit 400 may be omitted. It may be.

The display unit 500 may receive data for displaying a screen from the controller 600, for example, a magnetic resonance image, and display the received data on the screen. In addition, the display unit 500 may visually provide a menu, data, function setting information, and various other information of the magnetic resonance imaging apparatus 10 to the user. When the display unit 500 is formed as a touch screen, some or all of the functions of the input unit 400 may be performed instead. The display unit 500 may be formed of a liquid crystal display (LCD), organic light emitting diodes (OLEDs), active matrix organic light emitting diodes (AMOLEDs), and the like.

Next, a coaxial coil structure according to an embodiment of the present invention will be described in more detail. 2 is a view for explaining a coaxial coil structure according to an embodiment of the present invention. 3 and 4 are views for explaining the sheet of the coaxial coil structure according to the embodiment of the present invention. 5 is a view for explaining a coaxial coil of a coaxial coil structure according to an embodiment of the present invention. 6 and 7 are views for explaining the coupling structure of the sheet and the coaxial coil according to an embodiment of the present invention. 8 is a diagram illustrating a peripheral circuit of a coaxial coil structure according to an exemplary embodiment of the present invention. 9 to 11 are diagrams for explaining a plurality of loops formed through a plurality of coaxial coil structures according to an embodiment of the present invention.

Referring to FIG. 2, the coaxial coil structure 300 according to an embodiment of the present invention is connected to the coaxial coil 320 and the coaxial coil 320, which are entangled in the form of sewing on the sheet 310 and the sheet 310. Peripheral circuitry 330 to be included.

The sheet 310 is for fixing the coaxial coil 320 to maintain a close state while wrapping the inspection site of the inspector. To this end, the sheet 310 is plastic. That is, as shown in FIG. 3, the sheet 310 is basically in the form of a plane before deformation. In particular, as shown in FIG. 4, since the sheet 310 has plasticity, the sheet 310 may be modified as shown in FIG. 4 in the form of the surface of FIG. 3. Accordingly, the sheet 310 may be in close contact while wrapping the inspection site of the inspector. The sheet 310 is made of a polymer that has plasticity at a predetermined first temperature or higher and returns to a solid state below a predetermined second temperature lower than the predetermined first temperature. Sheet 310 may be a thermoplastic sheet. For example, the sheet 310 melts or has fluidity when heated above a predetermined first temperature. Here, the first temperature may be 60 degrees to 70 degrees. As described above, the sheet 310 may be deformed to be in close contact with the examination site of the patient by applying heat above the first temperature to deform the shape of the sheet 310. When the sheet 310 is lowered below the second temperature, the sheet 310 is deformed to be made of a polymer that returns to a solid state as it is in close contact with the examination site of the patient. Here, the second temperature may be 40 degrees to 50 degrees. As such, the sheet 310 has plasticity only when artificial heat is applied above the first temperature, and the sheet 310 is solidified at room temperature at which actual inspection is performed below the second temperature. Accordingly, the sheet 310 is deformed so as to be in close contact with the inspection site of the inspector in a state in which the sheet 310 has a plasticity of more than the first temperature, and then maintained in a deformed state during inspection at room temperature below the second temperature. If it is necessary to reuse after the heat is applied to the sheet 310 can be reused.

In addition, the sheet 300 should not be warped when manufactured in the form of sewing by the coaxial coil 320, and should be short in reproducibility and return to the original state. Sensitivity to low temperatures should be low and should consist of thermoplastic sheets with high elasticity when in close contact with the patient's skin. In addition, there is an advantage that can be recycled in this area. Thermoplastics are produced by high molecular compounds that interact with weak intermolecular forces. And it is preferable that the sheet 300 has a thickness of 2mm.

As shown in FIG. 5, the coaxial coil 320 may basically include a coaxial center conductor 321 and a center insulator 323 surrounding the center conductor 321. In addition, the coaxial coil 320 may further include an outer conductor 325 surrounding the center insulator 323 and an outer insulator 327 surrounding the outside of the outer conductor 325. The center conductor 321 and the outer conductor 325 of the coaxial coil 320 are conductors and may be formed using copper. The center insulator 323 and the outer insulator 327 are formed of an insulating material for insulating, and the insulating material is preferably formed of polyvinyl chloride (PVC). Coaxial coil 320 is preferably in the form of, for example, 50 ohm RG-316 cable. In case of RG-316 cable, you can remove the connector at both ends of SMA, SMB, BNC, TNC, MCX.

As shown in FIGS. 3 and 4, the sheet 310 has a plurality of openings 311. The coaxial coil 320 is deformed according to the deformation of the sheet 310 to have plasticity so as to be in close contact with the inspection site. To this end, the coaxial coil 320 is entangled with the sheet 310 through the plurality of openings 311 of the sheet 310. 6 illustrates a form in which the coaxial coil 310 is entangled with the opening 311 of the sheet 310. 7 shows the cross section of the form in which the coaxial coil 310 was entangled with the opening 311 of the sheet 310. In addition, the size of the opening 311 of the sheet 310 is formed to be proportional to the diameter of the coaxial coil 320. Coaxial coil 320 may be a coaxial cable.

As shown in FIG. 8, the coaxial coil 320 constitutes a loop shape. A plurality of peripheral circuits 330 are connected to this coaxial coil. The plurality of peripheral circuits 330 may be connected to a coaxial coil forming a loop to form peripheral circuits 330 (330p, 330a, 330t, and 330c). Peripheral circuits 330p, 330a, and 330t include detuning circuits 330p and 330a, tuning circuits 330t, and capacitors 330c.

The detuning circuits 330p and 330a are passive, that is, passive detuning circuits 330p that suppress resonance according to switching, and active detuning circuits 330a that suppress resonance in an active manner. ).

As shown, the passive detuning circuit 330p includes a first capacitor C1, a second capacitor C2, a first variable capacitor vC1, a first inductor L1, and a cross diode. CD). Here, each of the first capacitor C1, the second capacitor C2, and the first inductor L1 is connected in parallel, the first variable capacitor vC1 is connected in series with the first capacitor C1, and cross The diode CD is connected in series to the first inductor L1.

The active detuning circuit 330a is for suppressing resonance when the coaxial coil 320 transmits electromagnetic waves. The active detuning circuit 330a includes a fifth capacitor C5, a sixth capacitor C6, a diode D, and a second inductor L2. Here, the fifth capacitor C5 and the sixth capacitor C6 are connected in series, the diode is connected in parallel with the sixth capacitor C6, and the second inductor is connected in series with the diode D.

The tuning circuit 330t includes a second variable capacitor vC2 and a third capacitor C3 and is connected in parallel with the second variable capacitor vC2 and the third capacitor C3.

According to each frequency, the shape of the cable plate, that is, the number of segments and the size of the capacitor may vary. The cable plate determines the capacitor break point and the number of segments of the coaxial coil 320. The number of segments can vary depending on the size of the coaxial loop. In the case of a cable plate, the magnitude of the capacitance value is adjusted, and the magnitude of the capacitance value may vary depending on the size of the coaxial loop. For example, as illustrated in FIGS. 9 to 10, the coaxial coil 320 including the peripheral circuit 330 may form a coaxial loop. The plurality of coaxial loops may be arranged such that at least some overlap each other.

As a result, as shown in FIG. 11, the coaxial coil 320 including the peripheral circuit 330 may form a plurality of coaxial loops in a form intertwined with the sheet 310. In particular, at least one of the coaxial loops of the plurality of coaxial loops and the other of the coaxial loops is formed to overlap at the inspection site 301 of the inspector.

Next, the arrangement of the coaxial coil 320 forming the plurality of loops will be described. 12 to 14 are views for explaining an arrangement of coaxial coils forming a plurality of loops according to an embodiment of the present invention.

As shown in FIG. 12, the sheet structure 300 according to the embodiment of the present invention is formed in close contact with the inspection site 301 of the inspector. That is, as shown in Figure 13, the sheet 310 of the sheet structure 300 is formed in close contact with the inspection site 301 of the inspector, and thus, the peripheral circuit (entangled with the sheet 310) Coaxial coil 320 including 330 may also be formed in close contact with the inspection site of the inspector.

In particular, when the coaxial coil 320 forms a plurality of loops, as shown in FIG. 13, one of the plurality of loops and the other one of the loops have a static field direction (Z direction in the drawing) of the inspection site. Are formed to face each other in the horizontal section of the.

In addition, as illustrated in FIGS. 13 and 14, the center of gravity of the vertical section A-A in the direction of the static field of the inspection site may be set to the central axis C penetrating in the direction of the static field. In this case, the coaxial coils 320a or 320b constituting any one of the plurality of loops and the coaxial coils 320c and 320d constituting the other loop are 170 degrees with respect to the static field direction axis Z of the inspection site. To 190 degrees is formed to pass through the axisymmetric position.

As such, the coaxial coil 320a or 320b according to the embodiment of the present invention is fixed to the inspection site 301 through the seat 310. Accordingly, the coaxial coil 320a or 320b is in close contact with the patient's skin, thereby minimizing the excitation space between the test site and the coaxial coil 320a or 320b and minimizing the air layer due to the excitation space. Furthermore, even when the patient moves slightly, the seat 310 may support the coaxial loop including the coaxial coil 320 including the peripheral circuit 330 so as not to be twisted. Therefore, when the magnetic resonance signal is received through the coaxial coil 320, the SNR characteristic may be improved.

Next, a method of generating a magnetic resonance image of the magnetic resonance imaging apparatus including the coaxial coil structure described above will be described. 15 is a flowchart illustrating a method of generating a magnetic resonance image of a magnetic resonance imaging apparatus including a coaxial coil structure according to an exemplary embodiment of the present invention. In FIG. 15, the coaxial coil 320 will be described assuming that a transmission (Tx) coaxial coil for emitting electromagnetic waves and a reception (Rx) coaxial coil for receiving a magnetic resonance signal are configured as one. However, the present invention is not limited thereto, and it will be understood by those skilled in the art that the transmit (Tx) coaxial coil and the receive (Rx) coaxial coil may be configured separately.

Referring to FIG. 15, the control unit 600 of the magnetic resonance imaging apparatus 10 forms a magnetic field around the examiner through the magnet 100 and the gradient magnetic field coil 200 in step S110. That is, the controller 600 forms a static magnetic field around the inspector through the magnet 100 and forms a gradient magnetic field through the gradient magnetic field coil 200.

Then, the control unit 600 of the magnetic resonance imaging apparatus 10 emits an electromagnetic wave to the inspection site 301 of the examiner through the coaxial coil 320 in step S120. When electromagnetic waves are emitted, a magnetic resonance signal is generated from the inspection portion 301 by the emitted electromagnetic waves.

At this time, the control unit 600 is generated from the inspection site 301 through the coaxial coil 320 formed by being entangled in a close contact with the sheet 310 while wrapping the inspection site 301, as shown in FIG. The received magnetic resonance signal.

Subsequently, the controller 600 constructs a magnetic resonance image from the magnetic resonance signal received in step S140. The controller 600 may display the configured magnetic resonance image through the display unit 500.

As described above, according to the exemplary embodiment of the present invention, the air layer between the inspection portion 301 and the coaxial coil 320 is minimized because the coaxial coil 320 is closely attached to the inspection portion 301 of the inspector through the sheet 310. do. Accordingly, the SNR characteristic of the magnetic resonance signal is improved, and artifacts on the magnetic resonance image can be minimized to form a high quality magnetic resonance image.

Meanwhile, the access control method according to the embodiment of the present invention described above may be implemented in a program form readable through various computer means and recorded on a computer readable recording medium. Here, the recording medium may include a program command, a data file, a data structure, etc. alone or in combination. The program instructions recorded on the recording medium may be those specially designed and constructed for the present invention, or may be known and available to those skilled in computer software. For example, the recording medium may be magnetic media such as hard disks, floppy disks, and magnetic tapes, optical media such as CD-ROMs, DVDs, or magnetic-optical media such as floptical disks. magneto-optical media, and hardware devices specifically configured to store and execute program instructions, such as ROM, RAM, flash memory, and the like. Examples of program instructions may include high-level language wires that can be executed by a computer using an interpreter as well as machine language wires such as those produced by a compiler. Such hardware devices may be configured to operate as one or more software modules to perform the operations of the present invention, and vice versa.

While the invention has been described using some preferred embodiments, these embodiments are illustrative and not restrictive. As such, those of ordinary skill in the art will appreciate that various changes and modifications can be made according to equivalents without departing from the spirit of the present invention and the scope of rights set forth in the appended claims.

100: magnet
200: gradient magnetic field coil
300: coaxial coil structure
310: sheet
320: coaxial coil
330: peripheral circuit
400: input unit
500: display unit
600: control unit

Claims (16)

In the coaxial coil structure for obtaining a magnetic resonance image,
A sheet having a surface shape in which a plurality of openings are formed before deformation, and having a thermoplastic so as to be fixed while surrounding the inspection part of the inspector while being deformed to be fixed; And
It is deformed according to the deformation of the sheet to have a plasticity to be fixed while maintaining a close state while wrapping the inspection site of the inspector, coaxial coil formed by being entangled in the sheet through the plurality of openings;
The sheet has a thermoplastic when artificial heat is applied above the first temperature,
Solidifies at room temperature below the second temperature at which the inspection takes place,
After being deformed so as to be in close contact with the inspection site of the inspector in the state having a thermoplastic temperature of more than the first temperature, it is solidified at room temperature less than the second temperature is fixed while maintaining a close state while wrapping the inspection site
Coaxial coil structure. The method of claim 1,
The coaxial coil is
Coaxial coil structure characterized in that to form a plurality of loops in close contact with the inspection site of the inspector by combining in a tangled form on the sheet. The method of claim 2,
At least one of the loops and the other one of the plurality of loops at least a portion of the coaxial coil structure, characterized in that overlapping at the inspection site of the inspector. The method of claim 2,
Any one of the plurality of loops and the other one of the loops is formed in the horizontal cross section in the horizontal direction in the direction of the static field of the inspection site, the coaxial coil structure. The method of claim 2,
When there is a central axis penetrating the center of gravity of the vertical section in the direction of the static field of the test site in the direction of the static field, one of the loops and the other of the loops refer to the direction of the static field direction of the test site. Coaxial coil structure characterized in that formed so as to pass through the position of 170 to 190 degrees axisymmetric. The method of claim 1,
The coaxial coil is
A coaxial cable structure comprising a coaxial center conductor and an insulator surrounding the center conductor. The method of claim 6,
The coaxial coil is
And an outer insulator surrounding the insulator and an outer insulator surrounding the outside of the outer conductor. The method of claim 1,
The sheet is
A coaxial coil structure having plasticity when applied with heat above a predetermined first temperature and solidifying below a predetermined second temperature lower than the first temperature. The method of claim 1,
The coaxial coil structure
And a peripheral circuit including a detuning circuit and a tuning circuit connected to the coaxial coil. The method of claim 9,
The detuning circuit comprises a passive detuning circuit,
The passive detuning circuit includes a first capacitor, a second capacitor, a first variable capacitor, a first inductor, and a cross diode, wherein each of the first capacitor, the second capacitor, and the first inductor is connected in parallel, and the first capacitor The variable capacitor is connected in series with the first capacitor and the cross diode is connected in series with the first inductor. The method of claim 9,
The detuning circuit comprises an active detuning circuit,
The active detuning circuit includes a fifth capacitor, a sixth capacitor, a diode, and a second inductor,
The fifth capacitor and the sixth capacitor are connected in series, the diode is connected in parallel with the sixth capacitor, and the second inductor is connected in series with the diode. The method of claim 9,
The tuning circuit
A second variable capacitor and a third capacitor,
And the second variable capacitor and the third capacitor are connected in parallel. In the magnetic resonance imaging apparatus,
Magnet;
Gradient magnetic coils; And
It is connected to the coaxial coil, a sheet having a plurality of openings and formed with a plurality of openings, a coaxial coil entangled in the sheet through the plurality of openings, while maintaining a close contact with the inspection site to be fixed A coaxial coil structure comprising a peripheral circuit formed; And
The magnetic field is formed around the inspector through the magnet and the gradient magnetic field coil, radiates electromagnetic waves to the inspected part of the inspector through the coaxial coil, and is generated from the inspected part by the radiated electromagnetic waves through the coaxial coil. And a controller configured to receive a magnetic resonance signal, and to configure a magnetic resonance image from the received magnetic resonance signal.
The sheet has thermoplasticity when artificial heat is applied above the first temperature, and solidifies at room temperature where inspection below the second temperature occurs,
After being deformed so as to be in close contact with the inspection site of the inspector in the state having a thermoplastic temperature of more than the first temperature, it is solidified at room temperature less than the second temperature is fixed while maintaining a close state while wrapping the inspection site
Magnetic resonance imaging device. delete In the magnetic resonance image generation method of the magnetic resonance imaging apparatus,
Providing a sheet that has a thermoplastic when the artificial heat is applied above the first temperature and that is solidified at room temperature where inspection below the second temperature occurs;
The sheet is deformed to be in close contact with the inspection site of the inspector in a state having thermoplasticity of the first temperature or more, and then solidified at room temperature below the second temperature to maintain and maintain a close state while wrapping the inspection site. step;
Forming a magnetic field around the examiner;
Radiating an electromagnetic wave to an inspection site of the inspector;
Acquiring a magnetic resonance signal generated from the inspection site by the radiated electromagnetic wave through a coaxial coil intertwined with the sheet; And
And constructing a magnetic resonance image from the obtained magnetic resonance signal. delete

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