CN104771169A - Magnetic resonance imaging device and gasket tray - Google Patents
Magnetic resonance imaging device and gasket tray Download PDFInfo
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- CN104771169A CN104771169A CN201510005186.4A CN201510005186A CN104771169A CN 104771169 A CN104771169 A CN 104771169A CN 201510005186 A CN201510005186 A CN 201510005186A CN 104771169 A CN104771169 A CN 104771169A
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- A61B5/05—Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fields; Measuring using microwaves or radio waves
- A61B5/055—Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fields; Measuring using microwaves or radio waves involving electronic [EMR] or nuclear [NMR] magnetic resonance, e.g. magnetic resonance imaging
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Abstract
The invention relates to magnetic resonance imaging device and a gasket tray, and the static magnetic field can be maintained to be uniform. The magnetic resonance imaging device is provided with a gasket accommodating portion and a structural body. Metallic gaskets are accommodated in the gasket accommodating portion in a stacked manner. Furthermore, when the gasket accommodating portion is inserted into an inclined magnetic field coil, at least one inner wall of two inner walls which are arranged oppositely in the axial direction is inclined relative to a surface which is vertical to the axial direction. In addition, the structural body is arranged on the gasket accommodating portion and can move along the gasket accommodating portion in an inclined manner.
Description
The application advocates the priority of the Japanese patent application No. 2014-002694 that on January 9th, 2014 applies for, and quotes the full content of above-mentioned Japanese patent application in this application.
Technical field
Embodiment relates to MR imaging apparatus and pad pallet.
The MR imaging apparatus of embodiment possesses pad resettlement section and tectosome.Pad resettlement section is accommodated stacked for metallic gasket.In addition, at least one inwall of pad resettlement section in axially opposed 2 inwalls of this pad resettlement section when being inserted into gradient magnetic field coil has inclination relative to axially vertical mask.In addition, tectosome is configured in above-mentioned pad resettlement section, can along above-mentioned inclination movement.
According to the MR imaging apparatus of embodiment, the uniformity of magnetostatic field can be maintained.
Detailed description of the invention
Below, with reference to accompanying drawing, the MR imaging apparatus involved by embodiment and pad pallet are described.
(the 1st embodiment)
Fig. 1 is the functional block diagram of the structure of the MRI device 100 represented involved by the 1st embodiment.In addition, below, MR imaging apparatus is called MRI (Magnetic ResonanceImaging) device.
As shown in Figure 1, MRI device 100 possesses: static field magnet 101, magnetostatic field power supply 102, gradient magnetic field coil 103, leaning magnetic field power supply 104, RF coil 105, sending part 106, acceptance division 107, bed 108, sequence (sequence) control part 120, computer 130.In addition, MRI device 100 does not comprise subject P (such as, human body).In addition, the structure shown in Fig. 1 is an example only.Each portion also can suitably be formed in comprehensive or separation.
Static field magnet 101 is the columnar Magnet forming hollow, produces magnetostatic field in the space of cylinder interior.Static field magnet 101 is such as superconducting magnet etc., accepts the supply of electric current and excite from magnetostatic field power supply 102.Magnetostatic field power supply 102 pairs of static field magnet 101 supply electric current.In addition, static field magnet 101 can be permanent magnet, and now, MRI device 100 also can not possess magnetostatic field power supply 102.In addition, magnetostatic field power supply 102 also can separate with MRI device 100 and arrange.
Gradient magnetic field coil 103 is configured in the inner side of static field magnet 101, is the columnar coil being formed as hollow.The supply that gradient magnetic field coil 103 accepts electric current from leaning magnetic field power supply 104 produces leaning magnetic field.In addition, describe in detail for after gradient magnetic field coil 103.Leaning magnetic field power supply 104 supplies electric current to gradient magnetic field coil 103.
RF coil 105 is configured in the inner side of gradient magnetic field coil 103, and the supply accepting RF pulse from sending part 106 produces high frequency magnetic field.In addition, RF coil 105 receives the magnetic resonance signal (following, to be suitably called " MR (Magnet ic Resonance) signal ") that the impact due to high frequency magnetic field sends from subject P, will receive MR signal and export acceptance division 107 to.
In addition, above-mentioned RF coil 105 is an example only.RF coil 105 by combination only possess sending function coil, only possess receiving function coil or possess in the coil of transmission and reception function one or more form.
Sending part 106 supplies the RF pulse corresponding with the Larmor frequency that kind and the magnetic field intensity by the atom as object determines to RF coil 105.Acceptance division 107 detects the MR signal exported from RF coil 105, generates MR data according to the MR signal detected.Specifically, acceptance division 107 by carrying out digital translation to the MR signal exported from RF coil 105, thus generates MR data.In addition, the MR data of generation send to sequence control part 120 by acceptance division 107.In addition, acceptance division 107 also can be installed on the frame device side possessing static field magnet 101 or gradient magnetic field coil 103 etc.
Bed 108 possesses the top board of mounting subject P.In FIG, for convenience of explanation, this top board is only illustrated.Usually, to be set to its length direction parallel with the central shaft of the cylinder of static field magnet 101 for bed 108.In addition, top board can move at length direction and above-below direction, is inserted into the space of the cylinder interior of the inner side of RF coil 105 under the state of mounting subject P.In addition, sometimes the space of this cylinder interior is called " chamber (bore) " etc.
Sequence control part 120, by according to the sequence information sent from computer 130, drives leaning magnetic field power supply 104, sending part 106 and acceptance division 107 to carry out the shooting of subject P.At this, sequence information is the information defined the step of making a video recording.In sequence information, the timing etc. the timing of the intensity of the RF pulse that the timing (t iming) of the intensity of the electric current supplied to gradient magnetic field coil 103 by leaning magnetic field power supply 104 or supply electric current, sending part 106 supplys to RF coil 105 or applying RF pulse, acceptance division 107 being detected to MR signal defines.
Such as, sequence control part 120 is integrated circuit or the electronic circuits such as CPU (Central Processing Unit), MPU (Micro Processing Unit) such as ASIC (Application Specific IntegratedCircuit), FPGA (Field Programmable Gate Array).
In addition, the result that sequence control part 120 drives leaning magnetic field power supply 104, sending part 106 and acceptance division 107 couples of subject P to make a video recording is, when receiving MR data from acceptance division 107, the MR data received is passed on to computer 130.
The entirety that computer 130 carries out MRI device 100 controls.In addition, computer 130, by passing on the reconstruction process such as next MR data applying Fourier transformation from sequence control part 120, carries out the generation etc. of MR image.Such as, computer 130 possesses control part, storage part, input part, display part.Control part is the electronic circuits such as integrated circuit, CPU, MPU such as ASIC, FPGA.Storage part is the semiconductor memery device such as RAM, flash memory, hard disk drive, CD etc.Input part is that the positioning equipment such as mouse or trace ball (trackball) (pointingdevice), mode selector switch etc. select the input equipment such as equipment or keyboard.Display part is the display devices such as liquid crystal display.
Fig. 2 is the axonometric chart of the structure of the gradient magnetic field coil 103 represented involved by the 1st embodiment.At this, in the 1st embodiment, gradient magnetic field coil 103 is ASGC (ActivelyShielded Gradient Coil).As shown in Figure 2, in gradient magnetic field coil 103, inside cylinder, stack gradually main coil 103a, spacer layer 103b and shielding (shield) coil 103c.This main coil 103a is the coil producing leaning magnetic field, and shielded coil 103c is the coil in the magnetic field producing the shielding eliminating stray magnetic field.
Spacer layer 103b is the layer of configuration iron gasket.Specifically, be formed with multiple pad pallet at spacer layer 103b and insert guide 103d.Pad pallet inserts guide 103d and is total length throughout the axis of gradient magnetic field coil 103 and the hole run through, is equally spaced formed at circumferencial direction.Guide 103d is inserted to this pad pallet and inserts pad pallet 10 (in fig. 2, omitting diagram).In addition, the structure shown in Fig. 2 is an example only.Such as, at this, form at gradient magnetic field coil 103 situation that 24 pad pallets insert guide 103d although show, embodiment is not limited thereto, and the pad pallet that also can form arbitrary radical inserts guide 103d.
Fig. 3 is the axonometric chart of the structure of the pad pallet 10 represented involved by the 1st embodiment.As shown in Figure 3, pad pallet 10 has the multiple bag-like regions (hole) being arranged in string.Further, in each bag-like region, using the iron gasket 11 suitably laminated configuration of the plate as irony.That is, operator is by configuring the iron gasket of any number in the optional position (bag-like region) of circumferencial direction and axis, adjusts the uniformity of magnetostatic field.In addition, the structure shown in Fig. 3 is an example only.Such as, at this, exemplify the situation forming 10 bag-like regions on pad pallet 10, but embodiment is not limited thereto, and also can form the bag-like region of arbitrary quantity.
In addition, in the 1st embodiment, as shown in Figure 3, the direction of pad pallet 10 is defined.That is, when pad pallet 10 is inserted into gradient magnetic field coil 103 along the direction of arrow from bed side, the side of inserting at first is defined as rear side, the side of finally inserting is defined as front side.That is, the fore-and-aft direction of pad pallet 10 and the central shaft of static field magnet parallel.In addition, in pad pallet 10, the side existing for the bottom surface of bag-like region is defined as downside, its opposition side is defined as upside.In addition, when observing pad pallet 10 from front side towards rear side, the right side at the center of pad pallet 10 being defined as right side, left side being defined as left side.
In addition, in the 1st embodiment, the fore-and-aft direction of pad pallet 10 is called Z-direction (set rear side as just).In addition, the above-below direction of pad pallet 10 is called Y-direction (set upside as just).In addition, the left and right directions of pad pallet 10 is called X-direction (set right side as just).
But, in pad pallet in the past, even if sometimes adjust the uniformity of magnetostatic field, the uniformity of magnetostatic field can not be maintained.Such as, whenever making a video recording, uniformity is little by little chaotic sometimes.Further, nowadays clearly, the uniformity that can not maintain magnetostatic field causes due to the skew of the Z-direction of iron gasket 11.
Fig. 4 A and Fig. 4 B is the figure be described for the skew of the Z-direction for iron gasket 11.In Fig. 4 A and Fig. 4 B, exemplify by the section (YZ section) in the YZ plane at the center of pad pallet 10.
As shown in Figure 4 A, pad pallet 10 is the structures of the pad resettlement section 20 linking each bag-like region of multiple formation.That is, a pad resettlement section 20 forms a bag-like region.Further, the bag-like region in each pad resettlement section 20 configures stacked for iron gasket 11.In the example shown in Fig. 4 A, configure 4 iron gaskets 11 in each pad resettlement section 20.Further, iron gasket 11 configures thickness adjustment pad 21, in addition, covers lid 22.Like this, by from lid 22 side pressing iron gasket 11, iron gasket 11 movement in the Y direction (skew) is suppressed.In addition, pad pallet 10 can be formed by linking multiple pad resettlement section 20 being shaped (molding) individually, also can be shaped as the tectosome that multiple pad resettlement section 20 links.
At this, in order to the scale error of the scale error and bag-like region that absorb iron gasket 11, in other words, even if also iron gasket 11 can be contained in bag-like region to there is each scale error, bag-like region a certain amount of to be shaped with larger than iron gasket 11.Thus, between iron gasket 11 and the inwall of pad resettlement section 20, there is certain gap (Fig. 4 A).Further, in shooting, based on the electromagnetic force of magnetostatic field or leaning magnetic field in iron gasket 11, the Z-direction of iron gasket 11 in gap offsets, thus the situation of the uniformity confusion of magnetostatic field becomes obvious.
In addition, as shown in Figure 4 B, consider, by inserting pad (spacer) 23 between the inwall in pad resettlement section 20 and iron gasket 11, to suppress the skew of the Z-direction of iron gasket 11.But, respectively pad 23 is inserted to all bag-like regions and can spend very many man-hours.In addition, in the method, when pad 23 does not arrive the bottom surface of bag-like region, the iron gasket 11 of a part may enter the below of pad 23.Therefore, in the method, think and can not fully suppress iron gasket 11 in the skew of Z-direction.
In addition, the method for being fixed iron gasket 11 and pad resettlement section 20 by screw fastening is also considered.Now, in order to obtain required fastening force, use the screw of nonferrous metal.But, due to iron gasket 11 and the screws contact of nonferrous metal, therefore, the noise comparing and can produce because metal contact each other produces and more can produce picture noise (Pop noise) can be thought.
Therefore, the MRI device 100 involved by the 1st embodiment as described below, possesses: pad resettlement section 30, and the inwall in 2 opposed in the axial direction inwalls has inclination relative to axially vertical mask; Movable block 40, is configured at pad resettlement section 30, along inclination movement.Thereby, it is possible to by suppressing the skew of the Z-direction of iron gasket 11, maintain the uniformity of magnetostatic field.
Fig. 5 is the axonometric chart of the structure of the pad resettlement section 30 represented involved by the 1st embodiment.As shown in Figure 5, pad pallet 10 is the structures of the pad resettlement section 30 linking each bag-like region of multiple formation.Further, each pad resettlement section 30 has movable block 40.This movable block 40 is fixed on the inner side of pad resettlement section 30 by external screw thread 50.Below, use Fig. 6 and Fig. 7, the structure for pad resettlement section 30 and movable block 40 is described in detail.In addition, movable block 40 is examples for tectosome.
Fig. 6 is the figure of the structure of the pad resettlement section 30 represented involved by the 1st embodiment.In figure 6, the figure from top view pad resettlement section 30 is exemplified.As shown in Figure 6, the inwall of pad resettlement section 30 in 2 axially opposed inwalls has inclination relative to axially vertical mask.Specifically, as shown in region 31, the direction 32 of the inwall shown in region 31 has the inclination of angle θ relative to X-direction.
In addition, in the 1st embodiment, the inwall exemplifying region 31 doubles as the situation (Fig. 5 reference) of the inwall of 2 adjacent pad resettlement sections 30.Therefore, in figure 6, look that the inwall of both sides has inclination in 2 inwalls that pad resettlement section 30 is opposed in the axial direction.But, as shown in Figure 6, when in 2 pad resettlement sections 30, when iron gasket 11 is accommodated in the pad resettlement section 30 be positioned on rear side of inwall, this iron gasket 11 by being arranged in the inwall on the border of two pad resettlement sections 30, the inwall supporting in region 35 described later and region 36.At this, the face of supporting this iron gasket 11 is with XY parallel plane.Therefore, in fact, there is not gap with the contact internal walls in region 31 in this iron gasket 11.That is, in pad resettlement section 30, alternatively the inwall in region 31, region 35 and region 36 doubles as 2 opposed in z-direction inwalls.
In addition, the length of the inwall shown in region 31 of pad resettlement section 30 is shorter than the width of pad resettlement section 30.Such as, pad resettlement section 30 forms pentagonal structure in region 35 and region 36 respectively from upside observation.Therefore, the length of the left and right directions of the inwall in region 31 is shorter than the width of pad resettlement section 30.Thereby, it is possible to improve the intensity of inwall relative to the power of Z-direction.
In addition, pad resettlement section 30 has the right female thread 33 becoming external screw thread 50 in the bottom surface being configured with iron gasket 11.By external screw thread 50 and female thread 33, movable block 40 is fixed on pad resettlement section 30.In addition, pad resettlement section 30 has depression 34 in bottom surface.This depression 34 forms the space arranging jut 45 described later.In addition, if can form the structure in the space arranging jut 45, then depression 34 also can not necessarily cave in.Such as, corresponding with depression 34 position also can be the hole run through.In addition, the applied coating (coating) with anti-loosing effect of external screw thread 50.
Fig. 7 is the figure of the structure of the movable block 40 represented involved by the 1st embodiment.In the figure 7, the figure from top view movable block 40 is exemplified.In addition, the direction during illustrated direction represents when movable block 40 being fixed on pad resettlement section 30 XYZ coordinate system.
As shown in Figure 7, movable block 40 has the through hole 41 that above-below direction runs through.This through hole 41 is inserted into from upside by external screw thread 50, fastening by external screw thread 50 and the female thread 33 that will insert, thus movable block 40 is fixed on pad resettlement section 30.
At this, through hole 41 has the size that can change screw fastening position.Specifically, the major axis of through hole 41, to parallel relative to direction 42, has the width of the regulation can inserting external screw thread 50.This direction 42 has the inclination of angle θ relative to X-direction.Thus, on the direction 42 of movable block 40 in through hole 41, arbitrary position and pad resettlement section 30 screw fastening can be moved to.In addition, in the figure 7, exemplifying through hole 41 is oval situations, but embodiment is not limited thereto.Such as, through hole 41 can be rectangle, also can be other shape.
In addition, movable block 40 has the pad contacting surface 43 as the contact surface contacted with iron gasket 11.This pad contacting surface 43 is formed abreast relative to X-direction.In addition, pad contacting surface 43 has 3 surrectic structures.This surrectic structure is at the stacked direction of stacked iron gasket 11, that is, above-below direction (Y-direction) is formed abreast.Thus, even if stacked multiple iron gasket 11, the contact condition of each iron gasket 11 and pad contacting surface 43 also can be ensured.In addition, illustrated example is an example only, and such as, pad contacting surface 43 also can not have surrectic structure.But, in order to confirm each iron gasket 11 and the contact condition of pad contacting surface 43, wish that pad contacting surface 43 at least has more than one surrectic structure.Specifically, if pad contacting surface 43 has a surrectic structure, then can ensure the contact condition of each iron gasket 11 and pad contacting surface 43.In addition, as shown in Figure 7, when the width (distance when observing from upside) of pad contacting surface 43 is longer than the width in contact internal walls face 44, in order to confirm contact condition further, wish to possess two or more surrectic structure.In addition, in order to reduce the abrasion (abrasion caused with the contact of iron gasket 11) of surrectic structure, ensureing contact condition simultaneously, as illustrated, wishing to possess three surrectic structures.
In addition, movable block 40 has the contact internal walls face 44 of the contact surface as the contact internal walls with pad resettlement section 30.This contact internal walls face 44 is formed abreast relative to direction 42.Thereby, it is possible to make movable block 40 move along the inwall in region 31.In addition, can not change pad contacting surface 43 towards, and the position of pad contacting surface 43 is moved to X-direction and Z-direction.In addition, this moves and such as by being combined with female thread 33 standard by the external screw thread 50 being inserted into through hole 41, thus easily can carry out.
In addition, movable block 40 has the jut 45 of the lower end projection from pad contacting surface 43.Distance (distance of Z-direction) from the front end of this jut 45 to pad contacting surface 43 is than the distance in the gap shown in Fig. 4 A.In addition, when movable block 40 is fixed on pad resettlement section 30, above jut 45, become the position identical with the bottom surface of pad resettlement section 30.
In addition, movable block 40 is shaped by fiberglass reinforced plastics.Thus, movable block 40 can suppress the abrasion that causes due to the contact with iron gasket 11.
Fig. 8 A and Fig. 8 B is for the figure be fixedly described for the iron gasket 11 based on the pad pallet 10 involved by the 1st embodiment.In Fig. 8 A and Fig. 8 B, exemplify by the section (YZ section) in the YZ plane at the center of pad pallet 10.
As shown in Figure 8 A, pad pallet 10 is the structures of the pad resettlement section 30 linking each bag-like region of multiple formation.Such as, pad pallet 10 is shaped (molding) for linking a tectosome of multiple pad resettlement section 30.In addition, be not limited thereto, multiple pad resettlement section 30 also can be shaped individually.Now, by linking multiple pad resettlement section 30 be shaped individually, thus form pad pallet 10.
Such as, by making the external screw thread 50 of insertion through hole 41 combine with female thread 33 standard, thus movable block 40 is individually fixed in each pad resettlement section 30.At this, so-called accurate combination refers to and carries out screw fastening to be by halves fixed as movable block 40 completely motionless, and is installed as by movable block 40 in the scope of the size of through hole 41 and can moves at left and right directions.In addition, before collecting iron gasket 11, movable block 40 moves to left side (state of Fig. 5) in advance.
Then, the bag-like region in each pad resettlement section 30 is stacked rightly and accommodate by iron gasket 11.In the example shown in Fig. 8 A, configure 4 iron gaskets 11 in each pad resettlement section 20.At this, between iron gasket 11 and movable block 40 (pad contacting surface 43), form the gap (Fig. 8 A) of the scale error for the scale error and bag-like region absorbing iron gasket 11.Further, iron gasket 11 configures thickness adjustment pad (not shown).
Now, jut 45 becomes the state of the downside entering iron gasket 11.This is because the YZ section of movable block 40 is L-shaped shapes, prevents iron gasket 11 from entering the downside of movable block 40.Specifically, become the position identical with the bottom surface of pad resettlement section 30 above jut 45, and the length of jut 45 (distance from the front end of jut 45 to pad contacting surface 43) is than the distance in gap.
Further, movable block 40 is made to move to the right.At this, movable block 40 moves along the inwall in region 31.Thus, according to the distance making movable block 40 movement to the right, movable block 40 forward side moves.That is, until pad contacting surface 43 contacts with iron gasket 11 fill gap, movable block 40 is moved (Fig. 8 B) to the right.Further, be fixed in this condition, to make external screw thread 50 fully carry out screw fastening, movable block 40 can not move.Thus, pad pallet 10 can suppress iron gasket 11 in the skew of Z-direction.
In addition, Fig. 8 A and Fig. 8 B is the YZ section at the center by pad pallet 10, therefore, between the front side and inwall of iron gasket 11, vacates gap.But in fact, as shown in Figure 6 illustrates, the front side of iron gasket 11 is supported by the inwall in region 35 and region 36.
In addition, the angle θ of inclination is larger, then the displacement of filling the movable block 40 needed for gap is less.On the other hand, the angle θ of inclination is less, then the displacement of filling the movable block 40 needed for gap is larger.When angle θ is too small, sometimes can not fill gap, therefore, the angle θ of inclination is set to the size of the degree can filling gap.
In addition, even if pad pallet 10 has electromagnetic force based on magnetostatic field or leaning magnetic field in iron gasket 11, the fixing structure being also difficult to relax of movable block 40.This is because relative to the power of Z-direction acting on movable block 40, except the fastening force of screw, resisted by the frictional force between the contact internal walls face 44 of movable block 40 and the inwall of pad resettlement section 30.
Fig. 9 is the figure for being described for the frictional force of the pad pallet 10 involved by the 1st embodiment.In fig .9, exemplify from enlarged drawing during contact surface between top view pad resettlement section 30 and movable block 40.In addition, for convenience of explanation, in fig .9, compared with other accompanying drawing, angles of display θ is amplified.
As shown in Figure 9, when electromagnetic force is in iron gasket 11, when applying the power of Z-direction to movable block 40, pad resettlement section 30 accepts the power " F " of Z-direction from movable block 40." F " represents by with dip-parallel component " F1 " with the vertical component " F2 " that tilts.In addition, friction of rest power " f " is by the product representation of vertical resistance and coefficient of friction " μ ", and vertical resistance is equal with " F2 ".Therefore, when meeting following formula (1), movable block 40 does not offset.On the other hand, when formula (1) that discontented foot is stated, movable block 40 can along inclination and offset.
μ×F2＞F1…(1)
At this, the angle θ of inclination is less, then " F2 " is larger, and " F1 " becomes less.Thus, in the viewpoint of skew being prevented movable block 40 by frictional force, angle θ wish can blank map 8A gap scope in less.
Figure 10 is the axonometric chart of the structure of the lid 60 of the pad resettlement section 30 represented involved by the 1st embodiment.As shown in the region 61 of Figure 10, lid 60 is the structures covering movable block 40 and external screw thread 50.Thus, even if suppose that lid 60 presses movable block 40 and external screw thread 50 from top, therefore, it is possible to prevent movable block 40 and external screw thread 50 from departing from from pad resettlement section 30 when external screw thread 50 is lax.
As mentioned above, the MRI device 100 involved by the 1st embodiment possesses pad resettlement section 30, and the inwall of this pad resettlement section 30 in 2 axially opposed inwalls has inclination relative to axially vertical mask.In addition, MRI device 100 possesses and is configured at pad resettlement section 30, can along the movable block 40 of inclination movement.Thereby, it is possible to suppress the skew of the Z-direction of iron gasket 11, maintain the uniformity of magnetostatic field.
That is, the MRI device 100 involved by the 1st embodiment possesses: gradient magnetic field coil 103, produces leaning magnetic field; Pad resettlement section 30, is inserted into the inside of gradient magnetic field coil 103, can by rectangle and the metallic gasket of tabular (iron gasket 11) accommodate stackedly.Pad resettlement section 30 has as the movable block 40 along the inwall slide block (slider) of movement obliquely, is pressed, fixing metal pad by slide block.
In addition, pad resettlement section 30, movable block 40 and thickness adjustment pad etc., the parts that contact with iron gasket are all made up of non-conductive material (such as, fiberglass-reinforced plastic etc.).Therefore, not the formation of iron gasket 11 and other Metal Contact, so, the generation of Pop noise can be suppressed.
(other embodiment)
In addition, to be illustrated for the 1st embodiment above, in addition, also can to implement in a variety of ways.
Such as, in the above-described embodiment, exemplify and moved by the inwall of movable block 40 along region 31, thus suppress the situation of the skew of the Z-direction of iron gasket 11, but embodiment is not limited to this.Such as, MRI device 100 uses can the movable block 40 of movement along the Z direction, the skew of the Z-direction of suppression iron gasket 11.
Figure 11 is the figure of the structure of the movable block 40 involved by embodiment representing other.In the figure 7, the figure from top view movable block 40 is exemplified.In addition, the direction during illustrated direction represents when movable block 40 being fixed on pad resettlement section 30 XYZ coordinate system.
Movable block 40 shown in Figure 11 replaces through hole 41 and has through hole 46.This through hole 46 is the ellipses extended in the direction different from through hole 41, and its major axis is to parallel with Z-direction.That is, when with pad resettlement section 30 standard in conjunction with time, this movable block 40 can be mobile to Z-direction (fore-and-aft direction).Therefore, after iron gasket 11 is contained in pad resettlement section 30, when making movable block 40 side being moved forward, pad contacting surface 43 contacts with iron gasket 11 and fills gap.In this condition, make external screw thread 50 carry out screw fastening, the position of fixing movable block 40, thus the skew of the Z-direction of iron gasket 11 can be suppressed.
That is, other the MRI device 100 involved by embodiment possesses: pad resettlement section 30, by stacked for iron gasket 11 collecting; Movable block 40, is configured at pad resettlement section 30, can move along the Z direction.In addition, in the MRI device 100 involved by other embodiment, movable block 40 has jut 45, and pad resettlement section 30 has the depression 34 being formed and arrange the space of jut 45 in bottom surface.Therefore, other the MRI device 100 involved by embodiment can suppress iron gasket 11 in the skew of Z-direction.
In addition, when using the movable block 40 of Figure 11, the inwall in region 31 also can not have inclination.That is, the inwall in region 31 also can be parallel with XY plane.In addition, now, due to the frictional force caused due to inclination can not be produced, therefore, relative to the power of Z-direction acting on movable block 40, can only be resisted by the fastening force of screw.
In addition, such as, in the above-described embodiment, the inwall described in 2 axially opposed inwalls has the situation of inclination relative to the mask vertical with axis, but embodiment is not limited thereto.Such as, the both sides of this inwall also can have inclination.That is, pad resettlement section 30 is that at least one inwall in 2 inwalls that the axis of pad resettlement section 30 when being inserted into gradient magnetic field coil 103 is opposed has to axially vertical mask relatively by stacked for metallic gasket pad resettlement section 30 of accommodating.
In addition, pad resettlement section 30 has inclination, therefore, it is possible to adjust the position of the iron gasket 11 of axis the both sides of 2 axially opposed inwalls.
Figure 12 A and Figure 12 B is the figure of the structure of the pad resettlement section 30 involved by embodiment representing other.In fig. 12, exemplify the position of the iron gasket 11 before the adjustment of position, in Figure 12 B, exemplify the position of the iron gasket 11 after the adjustment of position.
As shown in Figure 12 A and Figure 12 B, pad resettlement section 30 has inclination the both sides of 2 axially opposed inwalls relative to axially vertical mask.Specifically, the inwall of region 31A and region 31B relative to X-direction respectively with θ
aand θ
bangular slope.Further, along the inwall of these regions 31A and region 31B, movable block 40A is configured respectively, 40B.In addition, this structure structure opposed with making the structure shown in Fig. 6 is corresponding, θ
aand θ
balso angle that can be not necessarily identical.In addition, θ
aand θ
balso arbitrary angle can be adjusted to.
In the example shown in Figure 12 A, movable block 40A, 40B, under the state that the positive direction of the X-direction in pad resettlement section 30 is close, are fixed with iron gasket 11.At this, if the interval of both sides does not change, then movable block 40A, even if 40B moves along the inwall of region 31A and region 31B respectively, also can fix iron gasket 11.As an example, as shown in Figure 12 B, movable block 40A, 40B move to the negative direction of X-direction.Now, movable block 40A, 40B are that the positive direction to Z-direction moves along the result of the inclination movement of inwall.Specifically, the interval 70 between the inwall of the positive direction of the Z-direction in pad resettlement section 30 and iron gasket 11, compared with the situation of Figure 12 A, narrows when Figure 12 B, knows that iron gasket 11 moves to the positive direction of Z-direction.
Like this, pad resettlement section 30 has inclination the both sides of 2 axially opposed inwalls, thus can adjust the position of axial iron gasket 11.In addition, in the example of Figure 12 A and Figure 12 B, exemplify movable block 40A, 40B moves to the situation of one end from one end of X-direction, but embodiment is not limited thereto, and can move to the arbitrary position of X-direction.Thus, movable block 40A, 40B can by fixing for iron gasket 11 optional positions in z-direction.
In addition, such as, in the above-described embodiment, describe the situation that movable block 40 has jut 45, but embodiment is not limited thereto.Such as, movable block 40 also can not necessarily have jut 45.Such as, in the example of fig. 7, even if do not have jut 45, movable block 40 by moving along the inwall in region 31, thus also can suppress the skew of the Z-direction of iron gasket 11.In addition, in the example of Figure 11, even if do not have jut 45, movable block 40 also by moving along the Z direction, thus can suppress the skew of the Z-direction of iron gasket 11.In addition, now, pad resettlement section 30 also can not have depression 34.
In addition, such as, in the above-described embodiment, the situation using iron gasket 11 is described, but also can be not necessarily made of iron.Such as, in order to adjust magnetostatic field, it also can be the metallic gasket be made up of magnetic metal.
According at least one embodiment described above, the uniformity of magnetostatic field can be maintained.
Although the description of several embodiment of the present invention, but these embodiments are pointed out as an example, is not intended to limit scope of the present invention.These embodiments can be implemented in other various modes, in the scope of main idea not departing from invention, can carry out various omissions, displacement, change.These embodiments or its distortion be contained in scope of invention or main idea the same, be contained in claims record invention and equalization scope in.
Background technology
Nuclear magnetic resonance is the nuclear spin magnetically being excited the subject be placed in magnetostatic field by RF (RadioFrequency) pulse of its Larmor (Larmor) frequency, and the camera method of data genaration image according to the magnetic resonance signal produced along with exciting.
In this nuclear magnetic resonance, require that magnetostatic field is even.Therefore, in order to adjust the uniformity of magnetostatic field, use pad pallet (shim tray).Specifically, pad pallet has multiple bag-like region (pocket) at length direction, in each bag-like region, accommodate iron gasket rightly.Further, this pad pallet is inserted into frame device along the long axis direction of cylinder.That is, be contained in the number of the iron gasket of each bag-like region by adjustment, adjust the uniformity of magnetostatic field.
But, in pad pallet in the past, even if the uniformity of adjustment magnetostatic field, sometimes can not maintain the uniformity of magnetostatic field.Such as, whenever making a video recording, uniformity can be little by little chaotic.
Summary of the invention
The problem to be solved in the present invention is, provides a kind of MR imaging apparatus and the pad pallet that can maintain the uniformity of magnetostatic field.
Accompanying drawing explanation
Fig. 1 is the functional block diagram of the structure of the MRI device represented involved by the 1st embodiment.
Fig. 2 is the axonometric chart of the structure of the gradient magnetic field coil represented involved by the 1st embodiment.
Fig. 3 is the axonometric chart of the structure of the pad pallet represented involved by the 1st embodiment.
Fig. 4 A is the figure be described for the skew of the Z-direction for iron gasket.
Fig. 4 B is the figure be described for the skew of the Z-direction for iron gasket.
Fig. 5 is the axonometric chart of the structure of the pad resettlement section represented involved by the 1st embodiment.
Fig. 6 is the figure of the structure of the pad resettlement section represented involved by the 1st embodiment.
Fig. 7 is the figure of the structure of the movable block represented involved by the 1st embodiment.
Fig. 8 A is for the figure be fixedly described for the iron gasket based on the pad pallet involved by the 1st embodiment.
Fig. 8 B is for the figure be fixedly described for the iron gasket based on the pad pallet involved by the 1st embodiment.
Fig. 9 is the figure for being described for the frictional force of the pad pallet involved by the 1st embodiment.
Figure 10 is the axonometric chart of the structure of the lid of the pad resettlement section represented involved by the 1st embodiment.
Figure 11 is the figure of the structure of the movable block involved by embodiment representing other.
Figure 12 A is the figure of the structure of the pad resettlement section involved by embodiment representing other.
Figure 12 B is the figure of the structure of the pad resettlement section involved by embodiment representing other.
Claims (13)
1. a MR imaging apparatus, is characterized in that, possesses:
Pad resettlement section, accommodates stacked for metallic gasket, and at least one inwall in axially opposed 2 inwalls of this pad resettlement section when being inserted into gradient magnetic field coil has inclination relative to axially vertical mask; With
Tectosome, is configured in above-mentioned pad resettlement section, can along above-mentioned inclination movement.
2. MR imaging apparatus according to claim 1, is characterized in that,
Above-mentioned tectosome has the jut of the lower end projection from the contact surface contacted with the metallic gasket being contained in above-mentioned pad resettlement section, identical with the basal surface position of above-mentioned pad resettlement section above this jut,
Above-mentioned pad resettlement section has the depression being formed and arrange the space of above-mentioned jut in above-mentioned bottom surface.
3. MR imaging apparatus according to claim 2, is characterized in that,
Above-mentioned jut is longer than the gap be contained between the metallic gasket of above-mentioned pad resettlement section and above-mentioned contact surface.
4. MR imaging apparatus according to claim 1, is characterized in that,
Above-mentioned tectosome has the through hole of the stacked direction running through the metallic gasket being contained in above-mentioned pad resettlement section, and the long axis direction of this through hole is dip-parallel relative to above-mentioned, and through hole has the width of regulation.
5. MR imaging apparatus according to claim 1, is characterized in that,
Above-mentioned tectosome has the pad contacting surface contacted with the metallic gasket being contained in above-mentioned pad resettlement section, and above-mentioned pad contacting surface is and axially vertical face,
Above-mentioned pad contacting surface has the parallel surrectic structure of the stacked direction stacked with the metallic gasket being contained in above-mentioned pad resettlement section.
6. MR imaging apparatus according to claim 1, is characterized in that,
Above-mentioned tectosome possess with the contact internal walls of the side with above-mentioned inclination and with above-mentioned dip-parallel contact internal walls face.
7. MR imaging apparatus according to claim 1, is characterized in that,
Above-mentioned tectosome is shaped by fiberglass reinforced plastics.
8. MR imaging apparatus according to claim 1, is characterized in that,
The length that above-mentioned pad resettlement section has the inwall of the side of above-mentioned inclination is shorter than the width of this pad resettlement section.
9. MR imaging apparatus according to claim 1, is characterized in that,
Above-mentioned MR imaging apparatus also possesses above-mentioned pad resettlement section and the fastening screw of above-mentioned tectosome,
The applied coating with anti-loosing effect of above-mentioned screw.
10. MR imaging apparatus according to claim 9, is characterized in that,
Above-mentioned MR imaging apparatus also possesses the lid covering and be contained in the metallic gasket of above-mentioned pad resettlement section,
Above-mentioned blanketing covers states tectosome and above-mentioned screw.
11. 1 kinds of MR imaging apparatus, is characterized in that,
Above-mentioned MR imaging apparatus possesses:
Pad resettlement section, accommodates stacked for metallic gasket; With
Tectosome, is configured at above-mentioned pad resettlement section, moving axially when can be inserted into gradient magnetic field coil along this pad resettlement section;
Above-mentioned tectosome has the jut of the lower end projection from the contact surface contacted with above-mentioned metallic gasket, identical with the basal surface position of above-mentioned pad resettlement section above this jut,
Above-mentioned pad resettlement section has the depression being formed and arrange the space of above-mentioned jut in above-mentioned bottom surface.
12. 1 kinds of pad pallets, is characterized in that possessing:
Pad resettlement section, accommodates stacked for metallic gasket, and at least one inwall in axially opposed 2 inwalls of this pad resettlement section when being inserted into gradient magnetic field coil has inclination relative to axially vertical mask; With
Tectosome, is configured at above-mentioned pad resettlement section, can along above-mentioned inclination movement.
13. 1 kinds of pad pallets, is characterized in that,
Above-mentioned pad pallet possesses:
Pad resettlement section, accommodates stacked for metallic gasket; With
Tectosome, is configured at above-mentioned pad resettlement section, moving axially when can be inserted into gradient magnetic field coil along this pad resettlement section,
Above-mentioned tectosome has the jut of the lower end projection from the contact surface contacted with above-mentioned metallic gasket, identical with the basal surface position of above-mentioned pad resettlement section above this jut,
Above-mentioned pad resettlement section has the depression being formed and arrange the space of above-mentioned jut in above-mentioned bottom surface.
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| JP2014-002694 | 2014-01-09 | ||
| JP2014002694A JP6245993B2 (en) | 2014-01-09 | 2014-01-09 | Magnetic resonance imaging apparatus and shim tray |
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| CN113661403A (en) * | 2019-04-02 | 2021-11-16 | 皇家飞利浦有限公司 | Passive shimming tray for magnetic resonance examination systems |
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Also Published As
| Publication number | Publication date |
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| CN104771169B (en) | 2017-11-07 |
| JP6245993B2 (en) | 2017-12-13 |
| JP2015130917A (en) | 2015-07-23 |
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Effective date of registration: 20160714 Address after: Japan Tochigi Tian Yuan City Applicant after: Toshiba Medical System Co., Ltd. Address before: Tokyo, Japan, Japan Applicant before: Toshiba Corp Applicant before: Toshiba Medical System Co., Ltd. |
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