JP6505819B2 - Vibrator and magnetic resonance imaging apparatus - Google Patents

Description

  Embodiments of the present invention relate to coil pads, shakers and Magnetic Resonance Imaging (MRI) devices.

  Conventionally, there is an imaging method called MR elastography as a method of measuring stiffness of an organ such as a liver using an MRI apparatus. In MR elastography, an exciter is disposed between a receiving coil of an MRI apparatus and a subject, and the exciter vibrates an organ of the subject during imaging, thereby mapping the elastic modulus representing stiffness. An image is obtained. Generally, such MR elastography identifies the fibrotic area in the organ and a biopsy is performed on the identified area.

"MR Elastography-Initial knowledge in Japan-GE Healthcare Japan Ltd.-in Navi Suite", [Search on July 17, 2013], Internet <URL: http://www.innervision.co.jp/ suite / ge / advanced_report2011 / 1109 />

  The problem to be solved by the present invention is to provide a vibrator and an MRI apparatus that can prevent the position of a target of a biopsy from being displaced after elastography.

  The vibrator according to the embodiment is a vibrator that vibrates a subject, and a coil opening portion of a receiving coil mounted on the subject and receiving a magnetic resonance signal generated from the subject, It is attached through the pad opening which the coil pad arranged between the receiving coil and the subject has.

FIG. 1 is a view showing an example of the arrangement of an MRI apparatus according to the first embodiment. FIG. 2 is a view showing an example of the receiving coil according to the first embodiment. FIG. 3 is a view showing an example of the coil pad according to the first embodiment. FIG. 4 is a view showing an example of the internal structure of the coil pad according to the first embodiment. FIG. 5 is a view showing a state in which the receiving coil is disposed on the coil pad according to the first embodiment. FIG. 6 is a view showing an example of a biopsy grid according to the first embodiment. FIG. 7 is a view showing an example of a coil pad according to the second embodiment. FIG. 8 is a view showing an example of a coil pad according to the third embodiment. FIG. 9 is a view showing a state in which a receiving coil is disposed on the coil pad according to the third embodiment. FIG. 10 is a view showing an example of a coil pad according to the fourth embodiment. FIG. 11 is a view showing a state in which a receiving coil is arranged on a coil pad according to the fourth embodiment. FIG. 12 is a view showing an example of a vibrator according to the fourth embodiment. FIG. 13 is a view showing an example of a biopsy grid according to the fourth embodiment. FIG. 14 is a view showing an example of a fixing unit that fixes the vibrator according to the fourth embodiment.

  Hereinafter, embodiments of the coil pad, the vibrator and the MRI apparatus will be described based on the drawings.

First Embodiment
FIG. 1 is a view showing an example of the arrangement of an MRI apparatus according to the first embodiment. As shown in FIG. 1, the MRI apparatus 100 includes a static magnetic field magnet 111, a gradient magnetic field coil 112, a transmission coil 113, a reception coil 120, a coil pad 130, a gradient magnetic field power supply 141, and a transmission unit 142. A reception unit 143, a sequence control device 150, a bed apparatus 160, and a computer system 170 are included.

  The static magnetic field magnet 111 is a magnet formed in a cylindrical shape, and generates a static magnetic field in the space inside the cylinder in which the subject S is disposed, by a current supplied from a static magnetic field power source (not shown).

  The gradient magnetic field coil 112 is a coil formed in a cylindrical shape, and is disposed inside the static magnetic field magnet 111. In addition, the gradient magnetic field coil 112 generates gradient magnetic fields along three directions of x, y and z orthogonal to each other in the space inside the cylinder in which the subject S is disposed by the current supplied from the gradient magnetic field power supply 141 Let

  The transmission coil 113 is a coil formed in a cylindrical shape, and is disposed inside the gradient magnetic field coil 112. In addition, the transmission coil 113 receives supply of high frequency current from the transmission unit 142 via the feeding cable, and generates a high frequency magnetic field in a space inside the cylinder in which the subject S is disposed.

  The static magnetic field magnet 111, the gradient magnetic field coil 112, and the transmission coil 113 are mounted on a gantry (not shown).

  The receiving coil 120 is mounted on the subject S and receives a magnetic resonance signal generated from the subject S due to the influence of the high frequency magnetic field. Further, the receiving coil 120 amplifies and outputs the received magnetic resonance signal by an internal amplifier.

  The coil pad 130 is disposed between the receiving coil 120 and the subject S. By arranging the coil pad 130 between the receiving coil 120 and the subject S, a constant distance can be provided between the receiving coil 120 and the subject S by the thickness of the coil pad 130. Thereby, the sensitivity of the receiving coil 120 can be adjusted. Further, the heat generated from the receiving coil 120 can be prevented from being directly transmitted to the subject S.

  The gradient power supply 141 supplies a current to the gradient coil 112 based on an instruction from the sequence controller 150. For example, the gradient magnetic field power supply 141 includes a high voltage generation circuit, a gradient magnetic field amplifier, and the like. The high voltage generation circuit converts an AC (Alternate Current) current supplied from a commercial AC power supply into a DC (Direct Current) current of a predetermined voltage and supplies it to the gradient magnetic field amplifier. The gradient magnetic field amplifier amplifies the DC current supplied from the high voltage generation circuit and supplies it to the gradient magnetic field coil 112.

  The transmitting unit 142 transmits an RF pulse to the transmitting coil 113 based on an instruction from the sequence control device 150. For example, the transmission unit 142 includes an oscillation unit, a phase selection unit, a frequency conversion unit, an amplitude modulation unit, an RF amplifier, and the like. The oscillator generates an RF pulse at a resonance frequency specific to the target nucleus in the static magnetic field. The phase selector selects the phase of the RF pulse generated by the transmitter. The frequency converter converts the frequency of the RF pulse output from the phase selector. The amplitude modulation unit modulates the amplitude of the RF pulse output from the frequency modulation unit according to, for example, a sinc function. The RF amplifier amplifies the RF pulse output from the amplitude modulation unit and supplies it to the transmission coil 113.

  The receiving unit 143 detects the magnetic resonance signal received by the transmission coil 113 based on an instruction from the sequence control device 150. Also, the reception unit 143 generates raw data by A / D (Analog-to-Digital) conversion of the detected magnetic resonance signal, and transmits the generated raw data to the sequence control device 150. For example, the receiving unit 143 includes a selector, a pre-stage amplifier, a phase detector, an A / D converter, and the like. The selector selectively inputs the magnetic resonance signal output from the transmission coil 113. The pre-amplifier amplifies the magnetic resonance signal output from the selector. The phase detector detects the phase of the magnetic resonance signal output from the pre-stage amplifier. The A / D converter converts the signal output from the phase detector into a digital signal.

  The sequence control device 150 executes data collection by driving the gradient magnetic field power supply 141, the transmitting unit 142, and the receiving unit 143 under the control of the computer system 170. In addition, when raw data is transmitted from the reception unit 143 as a result of data collection, the sequence control device 150 transmits the raw data to the computer system 170.

  The couch device 160 includes a top plate 161 on which the subject S is placed, and moves the top plate 161 together with the subject S to an imaging region in an opening provided in the gantry device.

  The computer system 170 controls the entire MRI apparatus 100. For example, the computer system 170 is transmitted from an input unit that receives various inputs from the operator, a sequence control unit that executes data collection to the sequence control apparatus 150 based on imaging conditions input from the operator, and the sequence control apparatus 150 An image reconstruction unit that reconstructs an image based on raw data, a storage unit that stores a reconstructed image, etc., a display unit that displays various information such as a reconstructed image, and the like based on instructions from the operator It has a main control unit that controls the operation of the functional unit.

  The configuration example of the MRI apparatus 100 according to the first embodiment has been described above. With such a configuration, in the MRI apparatus 100, the coil pad 130 disposed between the receiving coil 120 and the subject S is aligned with the coil opening of the receiving coil 120, It has a pad opening that forms a through hole between itself and the subject S, and a vibrating surface that is provided on the side facing the subject and vibrates when air vibrating into the hollow part formed inside is fed. .

  According to such a configuration, in the MRI apparatus 100 according to the first embodiment, the coil pad 130 can be used instead of the vibrator when MR elastography is performed. Then, after the MR elastography is performed, the puncture coil is inserted into the subject through the through hole formed by the coil opening of the reception coil 120 and the pad opening of the coil pad 130, whereby the reception coil is formed. A biopsy can be performed without removing the coil pad 120 and the coil pad 130 from the subject S.

  In the conventional MRI apparatus, since the exciter is arranged to cover the imaging region when performing MR elastography, it is necessary to remove the exciter when performing a biopsy. For this reason, after MR elastography was performed, it was necessary to remove the receiving coil covering the vibrator from the subject, remove the vibrator, and then reattach it to the subject. Generally, in MR elastography, the target position of the biopsy is specified based on the positional relationship with the biopsy grid attached to the receiving coil, so when the receiving coil is re-mounted before the biopsy, There was a case where the target position of the biopsy shifted.

  On the other hand, in the MRI apparatus 100 according to the first embodiment, the biopsy can be performed without removing the coil pad 130 and the receiving coil 120 from the subject S, so the position of the biopsy target shifts after elastography You can prevent that. Below, the MRI apparatus 100 which concerns on this embodiment is demonstrated in detail.

  FIG. 2 is a view showing an example of the receiving coil according to the first embodiment. For example, as shown in FIG. 2, the receiving coil 120 according to the first embodiment is a surface coil formed in a rectangular shape, and has four coil openings 121. Then, for example, when MR elastography is performed by the MRI apparatus 100, the receiving coil 120 is attached to the subject S so as to cover an organ to be a biopsy target. A transmission cable 122 for transmitting the magnetic resonance signal output from the reception coil 120 to the reception unit 143 is connected to the reception coil 120.

  The shape of the receiving coil 120 is not necessarily limited to the rectangular shape. For example, the shape of the receiving coil 120 may be square or circular. Further, the number of coil openings 121 included in the receiving coil 120 is not limited to four, as long as at least one coil opening 121 is provided.

  FIG. 3 is a view showing an example of the coil pad according to the first embodiment. For example, as shown in FIG. 3, the coil pad 130 according to the first embodiment is formed of a resin such as vinyl chloride in substantially the same shape as the receiving coil 120. For example, when the receiving coil 120 shown in FIG. 2 is used, the coil pad 130 is formed in a rectangular shape as the receiving coil 120 is. Further, four pad openings 131 having the same shape as the coil opening 121 are formed in the coil pad 130 at the same position as the four coil openings 121 of the receiving coil 120.

  The shape of the coil pad 130 may not necessarily exactly match the shape of the receiving coil 120. Specifically, the shape of the coil pad 130 is determined so that when at least one pad opening 131 is aligned with the coil opening 121 when the coil pad 130 is overlapped with the receiving coil 120, May be of different shapes. Further, the number of pad openings 131 included in the coil pad 130 may not necessarily be the same as the number of coil openings 121 included in the reception coil 120. Specifically, at least one pad opening 131 may be provided at a position aligned with the coil opening 121 when overlapping with the receiving coil 120.

  FIG. 4 is a view showing an example of the internal structure of the coil pad according to the first embodiment. For example, as shown in FIG. 4, the coil pad 130 according to the first embodiment has a hollow portion 132 inside. For example, as shown in FIG. 4, the hollow portion 132 is formed on the entire inside of the coil pad 130 except for the pad opening 131. A vibrating surface 133 is provided on the side of the coil pad 130 facing the subject S (the back side of the coil pad 130 shown in FIG. 3). The vibrating surface 133 vibrates when vibrating air is fed into the hollow portion 132. For example, air is fed into the hollow portion 132 from a vibration generator (not shown) via the air supply pipe 134 attached to the long side of the coil pad 130.

  The position where the air supply pipe 134 is attached is not necessarily limited to the long side of the coil pad 130. For example, the air supply pipe 134 may be attached to the short side of the coil pad 130 or may be attached to the corner. In addition, as long as the position does not overlap with the receiving coil 120, it may be mounted on the surface on the receiving coil 120 side.

  FIG. 5 is a view showing a state in which the receiving coil is disposed on the coil pad according to the first embodiment. As shown in FIG. 5, when the receiving coil 120 is disposed on the coil pad 130, the pad opening 131 of the coil pad 130 is aligned with the coil opening 121 of the receiving coil 120, and the coil opening is formed. A through hole is formed between 121 and the subject S. Then, the receiving coil 120 and the coil pad 130 are mounted on the subject S such that the vibrating surface 133 of the coil pad 130 is in contact with the subject S in the overlapped state as shown in FIG. 5.

  As described above, in the first embodiment, the vibrating surface 133 of the coil pad 130 is mounted so as to be in contact with the subject S in a state in which the receiving coil 120 and the coil pad 130 are overlapped. When done, the coil pad 130 can be used in place of a conventional exciter.

  FIG. 6 is a view showing an example of a biopsy grid according to the first embodiment. For example, as shown in FIG. 6, the biopsy grid 180 according to the first embodiment is received through the through hole formed between the coil opening 121 and the subject S by the pad opening 131. It is attached to the coil 120 and the coil pad 130. The biopsy grid 180 serves as a guide when the biopsy puncture needle is inserted into the subject S. For example, as shown in FIG. 6, the biopsy grid 180 has a plurality of adapter attachment parts 181 for fixing the puncture adapter attached to the puncture needle. Here, for example, the adapter mounting portions 181 are holes each formed in a rectangular shape, and are provided so as to be arranged along a plurality of rows and a plurality of columns.

  As described above, in the first embodiment, the biopsy grid 180 is attached through the coil opening 121 of the receiving coil 120 and the pad opening 131 of the coil pad 130. Therefore, after MR elastography is performed The biopsy can be performed without removing the receiving coil 120 and the coil pad 130 from the subject S.

  As described above, according to the first embodiment, the coil pad 130 can be used instead of the exciter when MR elastography is performed. Then, after the MR elastography is performed, a biopsy can be performed without removing the coil pad 130 and the receiving coil 120 from the subject S. Therefore, according to the first embodiment, it is possible to prevent the target position of the biopsy from shifting after elastography.

  Hereinafter, other embodiments of the coil pad, the vibrator and the MRI apparatus will be described. The configurations of the MRI apparatus and the receiving coil according to each embodiment described below are basically the same as those described in the first embodiment, and the configurations of the coil pad and / or the vibrator are different. It is only. Therefore, in each embodiment described below, the description of the configuration of the MRI apparatus and the receiving coil will be omitted, and the configuration of the coil pad and / or the vibrator will be mainly described. Moreover, in each embodiment shown below, the detailed description is abbreviate | omitted as attaching | subjecting the code | symbol same about the site | part which plays the same role as the site | part demonstrated in the 1st Example.

Second Embodiment
In the first embodiment described above, an example in which the hollow portion 132 is formed over the entire inside of the portion excluding the pad opening portion 131 in the coil pad 130 has been described. On the other hand, in the second embodiment, an example in which a plurality of hollow portions are formed inside the coil pad will be described.

  FIG. 7 is a view showing an example of a coil pad according to the second embodiment. For example, as shown in FIG. 7, the coil pad 230 according to the second embodiment includes six portions 235 a to 235 f, and a hollow portion is formed in each of the four portions 235 a to 235 d including the pad opening 131. It is formed. For example, as shown in FIG. 7, the hollow portion 232a is formed inside the portion 235a, and the hollow portion 232b is formed inside the portion 235b.

  Here, vibrating air is fed to the hollow portions formed inside the coil pad 230 through separate air supply pipes. For example, air is supplied to the hollow portion 232a formed inside the portion 235a through the air supply pipe 234a, and air is supplied to the hollow portion 232b formed inside the portion 235b through the air supply pipe 234b. Be done. Further, air is supplied to the hollow portion (not shown) formed inside the portion 235c through the air supply pipe 234c, and the hollow portion (not shown) formed inside the portion 235d is supplied Air is supplied via trachea 234d.

  As described above, in the second embodiment, a plurality of hollow portions are formed inside the coil pad 230, and air is supplied to each hollow portion through another air supply pipe, so that MR elastography is performed. In addition, the coil pad 130 can be vibrated locally. In addition, although the example in the case where an air supply pipe is provided in each of four part 235a-235d was shown in FIG. 7, the air supply pipe may be provided detachably. In that case, for example, the air supply pipe may be provided only in the vibrating portion among the four portions 235a to 235d. Also, the portion provided with the hollow portion may be part of the four portions 235a to 235d.

Third Embodiment
In the first and second embodiments described above, an example in which the biopsy grid 180 is attached through the through hole formed between the coil opening 121 and the subject S by the pad opening 131 is described. explained. On the other hand, in the third embodiment, an example in which a grid portion replacing the biopsy grid is provided on the coil pad itself will be described.

  FIG. 8 is a view showing an example of a coil pad according to the third embodiment. For example, as shown in FIG. 8, in the coil pad 330 according to the third embodiment, four grid portions 380 are formed at the same position as the four coil openings 121 of the receiving coil 120. Here, the grid portion 380 is aligned with the coil opening 121 of the receiving coil 120, and serves as a guide when the biopsy puncture needle is inserted into the subject S. For example, the grid unit 380 has a plurality of puncture guide holes 381 into which puncture needles are inserted. Here, for example, the puncture guide holes 381 are holes each formed in a circular shape, and are provided so as to be arranged along a plurality of rows and a plurality of columns. The peripheral portion of the puncture guide hole 381 is desirably reinforced so as not to be damaged by the puncture needle.

  FIG. 9 is a view showing a state in which a receiving coil is disposed on the coil pad according to the third embodiment. As shown in FIG. 9, when the receiving coil 120 is disposed on the coil pad 330, the grid portion 380 of the coil pad 330 is aligned with the coil opening 121 of the receiving coil 120. Then, the receiving coil 120 and the coil pad 330 are mounted on the subject S such that the vibrating surface 133 of the coil pad 330 is in contact with the subject S in the stacked state as shown in FIG.

  As described above, in the third embodiment, the vibrating surface 133 of the coil pad 130 is mounted so as to be in contact with the subject S in a state in which the receiving coil 120 and the coil pad 130 are overlapped. When done, the coil pad 130 can be used in place of a conventional exciter. In the third embodiment, puncturing can be performed via the coil opening 121 of the receiving coil 120 and the grid portion 380 of the coil pad 330. Therefore, after the MR elastography is performed, the receiving coil 120 and the receiving coil 120 can be used. A biopsy can be performed without removing the coil pad 330 from the subject S. Therefore, according to the third embodiment, it is possible to prevent the target position of the biopsy from shifting after elastography.

Fourth Embodiment
In the first to third embodiments described above, an example is described in which the coil pad is used instead of the vibrator by vibrating air being sent into the hollow portion formed in the inside and vibrating. . On the other hand, in the fourth embodiment, an example in which a vibrator is used will be described.

  FIG. 10 is a view showing an example of a coil pad according to the fourth embodiment. For example, as shown in FIG. 10, the coil pad 430 according to the fourth embodiment is formed in substantially the same shape as the receiving coil 120 by a resin such as vinyl chloride. For example, when the receiving coil 120 shown in FIG. 2 is used, the coil pad 430 is formed in a rectangular shape like the receiving coil 120. Further, in the coil pad 430, four pad openings 431 having the same shape as the coil opening 121 are formed at the same position as the four coil openings 121 of the receiving coil 120. The coil pad 430 according to the fourth embodiment does not have a hollow portion inside.

  The shape of the coil pad 430 may not necessarily exactly match the shape of the receiving coil 120. Specifically, the shape of the coil pad 430 is such that it is provided at a position where at least one pad opening 431 is aligned with the coil opening 121 when overlapping with the receiving coil 120. May be of different shapes. In addition, the number of pad openings 431 included in the coil pad 430 may not necessarily be the same as the number of coil openings 121 included in the reception coil 120. Specifically, at least one pad opening 431 may be provided at a position aligned with the coil opening 121 when overlapping with the receiving coil 120.

  FIG. 11 is a view showing a state in which a receiving coil is arranged on a coil pad according to the fourth embodiment. As shown in FIG. 11, when the receiving coil 120 is disposed on the coil pad 430, the pad opening 431 of the coil pad 430 is aligned with the coil opening 121 of the receiving coil 120, and the coil opening A through hole is formed between 121 and the subject S. The receiving coil 120 and the coil pad 430 are mounted on the subject S such that the vibrating surface 133 of the coil pad 430 is in contact with the subject S in an overlapping state as shown in FIG.

  FIG. 12 is a view showing an example of a vibrator according to the fourth embodiment. For example, as shown in FIG. 12, the vibration exciter 490 according to the fourth embodiment receives the receiving coil via the through hole formed between the coil opening 121 and the subject S by the pad opening 431. And 120 attached to the coil pad 430. Then, when MR elastography is performed, the vibrator 490 vibrates the subject S by the vibrating air being fed into the inside. For example, air is fed to the vibrator 490 from a vibration generator (not shown) via the air supply pipe 491 attached to the side surface of the vibrator 490.

  The position where the air supply pipe 491 is attached is not necessarily limited to the side surface portion of the vibrator 490. For example, the air supply pipe 491 may be attached to the upper surface of the vibrator 490 or may be attached to the corner. Specifically, for example, when the air supply pipe 491 is attached to the side surface portion of the vibrator 490, when the vibrator 490 is attached to the receiving coil 120 and the coil pad 430, it is exposed above the receiving coil 120. Attached to the

  FIG. 13 is a view showing an example of a biopsy grid according to the fourth embodiment. For example, as shown in FIG. 13, the biopsy grid 180 according to the fourth embodiment is similar to the biopsy grid 180 described in the first embodiment. Then, as shown in FIG. 13, the biopsy grid 180 is attached to the receiving coil 120 and the coil pad 430 instead of the exciter 490 when the biopsy of the subject S is performed. That is, the biopsy grid 180 is attached to the receiving coil 120 and the coil pad 430 through the through-hole formed between the coil opening 121 and the subject S by the pad opening 431.

  Thus, in the fourth embodiment, one of the vibrator 490 and the biopsy grid 180 is attached through the coil opening 121 of the receiving coil 120 and the pad opening 431 of the coil pad 430. Can. For this reason, after MR elastography is performed, the vibrator 490 is removed, and a biopsy is performed without removing the receiving coil 120 and the coil pad 430 from the subject S by attaching the biopsy grid 180 instead. be able to. Therefore, according to the fourth embodiment, it is possible to prevent the target position of the biopsy from shifting after elastography.

  Furthermore, in the fourth embodiment, the receiving coil 120 and the exciter 490 may be fixed to the subject S or the MRI apparatus 100 when elastography is performed. At this time, for example, when the exciter 490 is attached through the coil opening 121 of the receiving coil 120 and the pad opening 431 of the coil pad 430, the vibrator 490 is not connected to the receiving coil 120. It is fixed to the sample S or the MRI apparatus 100.

  FIG. 14 is a view showing an example of a fixing unit that fixes the vibrator according to the fourth embodiment. For example, as shown in FIG. 14, the receiving coil 120 is fixed to the top plate 161 or the bed apparatus 160 by the fixing unit 510, and the vibrator 490 is fixed to the top plate 161 or the bed apparatus 160 by the fixing unit 520. . Here, for example, the fixing portions 510 and 520 are each a bendable belt or the like. In that case, for example, the exciter 490 is formed to have a thickness larger than that of the receiving coil 120. Thus, when the vibrator 490 is fixed from above by the fixing portion 510, only the vibrator 490 is pressed and fixed by the fixing portion 510. The receiving coil 120 and the exciter 490 may be fixed to the subject S by the fixing units 510 and 520, respectively.

  Thus, by fixing the exciter 490 independently of the receiving coil 120, the vibration transmitted to the receiving coil 120 can be suppressed to only the vibration transmitted from the subject S. In addition, although the example in the case of using a bendable belt etc. as a fixing | fixed part was demonstrated here, the support body which has rigidity may be used as a fixing | fixed part, for example. In this case, the fixing unit holds the receiving coil 120 and the exciter 490 independently at fixed positions. Thereby, the vibration transmitted to the receiving coil 120 can be further suppressed.

  According to at least one embodiment described above, it is possible to prevent the target position of the biopsy from shifting after elastography.

  While certain embodiments of the present invention have been described, these embodiments have been presented by way of example only, and are not intended to limit the scope of the invention. These embodiments can be implemented in other various forms, and various omissions, replacements, and modifications can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the invention described in the claims and the equivalents thereof as well as included in the scope and the gist of the invention.

100 MRI apparatus 120 receiving coil 130 coil pad 131 pad opening 133 vibrating surface

Claims (6)

A vibrator for vibrating a subject, wherein
A coil opening of a receiving coil mounted on the subject and receiving a magnetic resonance signal generated from the subject; and a pad opening of a coil pad disposed between the receiving coil and the subject Attached through the, vibrator.   The vibration exciter according to claim 1, wherein when attached through the coil opening and the pad opening, it is fixed to the subject or the magnetic resonance imaging apparatus independently of the receiving coil. . A receiving coil mounted on a subject and receiving a magnetic resonance signal generated from the subject;
Mounted so as to penetrate at least one coil opening provided in the receiving coil to vibrate the object, and a removable vibrator from said coil opening,
A magnetic resonance imaging apparatus comprising: It further comprises a grid used for biopsy on the subject,
The coil opening is formed to allow the exciter to pass through, and is formed to allow the grid to be fitted.
The magnetic resonance imaging apparatus according to claim 3. The coil pad further includes a pad opening disposed between the subject and the receiving coil and having a pad opening through which the vibrator can penetrate.
The vibrator is mounted through the coil opening and the pad opening.
The magnetic resonance imaging apparatus according to claim 4. A receiving coil mounted on a subject and receiving a magnetic resonance signal generated from the subject;
A coil pad disposed between the receiving coil and the subject;
The coil pad has a pad opening aligned with the coil opening of the receiving coil to form a through hole between the coil opening and the subject, and the through hole is used to The magnetic resonance imaging system to which the exciter which vibrates the said test object is attached.

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