CN203149106U

CN203149106U - Testing device used for magnetic resonance imaging

Info

Publication number: CN203149106U
Application number: CN 201320057441
Authority: CN
Inventors: 张强
Original assignee: Shanghai United Imaging Healthcare Co Ltd
Current assignee: Shenzhen United Imaging Healthcare Co Ltd
Priority date: 2013-01-31
Filing date: 2013-01-31
Publication date: 2013-08-21
Anticipated expiration: 2023-01-31

Abstract

The utility model discloses a testing device used for magnetic resonance imaging. The testing device comprises a casing and a body arranged inside the casing. The body is provided with a plurality of cavities extending vertically; the upper and lower sides of the body are provided with flow-guide grooves; the flow-guide grooves are communicated with the cavities; the upper side of the casing is provided with an ejection opening; one side of the body is provided with flow-guide holes; the flow-guide holes are communicated with the flow-guide grooves; and the flow-guide holes are communicated with the outside through the ejection opening. An ejection object can enter the cavities smoothly, and air columns do not exist in the cavities, and therefore, the magnetic resonance imaging of the testing device is more realistic, and the accuracy of testing results can be ensured.

Description

The proving installation that is used for magnetic resonance imaging

[technical field]

The utility model relates to the mr imaging technique field, relates in particular to a kind of for the proving installation to the magnetic resonance image (MRI) quality evaluation.

[background technology]

In magnetic resonance image (MRI) quality evaluation process, need come imaging by means of proving installation usually, assess the performance quality of magnetic resonance system then by the performance (for example signal to noise ratio (S/N ratio), geometric distortion, resolution etc.) of image.

Proving installation generally is the housing of sealing, and enclosure interior comprises some test modules and can produce the material of MR signal (as water, different concentrations of copper sulphate solution, silicone oil etc.).

When the design test device, come the design test module according to the different purposes (for example testing signal to noise ratio (S/N ratio), geometric distortion or resolution) of mould usually.These modules can be made up of basic structures such as rectangular parallelepiped, right cylinder, spheroid, wedge, cavity, grids.For measuring resolution, can on module, intended diameter be the big areolas of series such as 2mm, 1.5mm, 1.0mm, 0.5mm for example.Becoming the diameter of the minimum cavity that can see on the image at magnetic resonance system, is exactly the highest resolution that system can reach.Again for example, in the 3D geometry test, the test module that needs design is the cavity structure (as Fig. 1) with array format, perfusion MR signal produces material in cavity, thereby on image, can observe the situation (as Fig. 2) that dot matrix is arranged, by the arrangement of dot matrix, we can assess the geometric distortion amount of magnetic resonance system in the test zone scope.

Two kinds of test modules of above example can be designed to the structure of similar Fig. 3 on section.Test module comprises perfusing hole 1, the cavity 2 that is used as test-purpose and the interval body 3 between the cavity 2, and interval body 3 is not for producing the material of MR signal.Before use, need to pass through perfusing hole 1 test module perfusion MR signal generation material for this reason, allow these materials that can produce the MR signal be full of in the cavity of test module.In the image of MR scanning, the material in the cavity can produce signal, and finally is reflected in (Fig. 2) in the image.Usually can pour into different materials in cavity according to purposes, these materials have different relaxation behaviors, thereby present different contrasts or brightness at image.

In this class testing module of design, the precision of measurement is relevant with the size of cavity.In order to improve measuring accuracy, require size design smaller of cavity.When perfusion MR signal produced material, because the aperture of cavity is very little, potting compound can seal whole cavity in the cavity filling process, and pressurized air forms one section gas column 4 in tiny cavity.Because the viscosity of potting compound is big, the cavity aperture size is little, and the pressure of potting compound is not enough, and reason such as surface tension, and the gas column in the cavity is difficult to emersion from cavity.Such proving installation will produce material (air can not produce the MR signal) because of lacking the MR signal in the cavity, and cause can not observing on the image feature that conforms to proving installation, even cause the false assessment to system performance in imaging.For example, image by geometric distortion water mould, in the non-linear process of proofreading and correct of gradient space, if the quantity of the feature location point in the image is owing to the influence of filling gas column in the cavity reduces, will cause the linear correction mass of gradient to reduce (shown in Figure 5, owing in the cavity gas column is arranged, causes the feature location point disappearance above the image).

[utility model content]

Technical problem to be solved in the utility model provides a kind of for the proving installation to the magnetic resonance image (MRI) quality evaluation.

The utility model is that to solve the problems of the technologies described above the technical scheme that adopts as follows: a kind of proving installation for magnetic resonance imaging, comprise shell body, place the body of shell body inside, body is provided with several cavitys that extends along the vertical direction, the upper and lower side of body is provided with diversion trench, diversion trench is connected with cavity, and the upside of shell body is provided with perfusing hole, and a side of described body also is provided with pod apertures, pod apertures is connected with diversion trench, and by perfusing hole and extraneous conducting.

Further, an other side of described body is provided with another pod apertures.

Further, the upside of described shell body is provided with exhausr port, and exhausr port is positioned at the top of another pod apertures.

Further, described several cavitys form array of cavities.

Further, has bulge on the described cavity.

Further, the cross section of described bulge is triangle or circle or rectangle.

Further, described bulge is communicated with several cavitys.

Further, the diameter of described pod apertures is big than the diameter of cavity.

Further, the diameter of described pod apertures is more than or equal to 2cm.

Further, described body is made by tygon or organic glass.

The utility model contrast prior art has following beneficial effect: potting compound flows to the diversion trench of body downside along pod apertures by perfusing hole, because the internal diameter of pod apertures is bigger, therefore potting compound can arrive diversion trench by pod apertures very soon, after diversion trench had been full of potting compound, potting compound can penetrate in the cavity owing to action of pressure.Because the body upper air vent is in open mode, therefore the air in the cavity can free flow, can be not compressed because of enclosure space, cause pressure rises, and stop potting compound to enter cavity, do not have gas column in the cavity thereby make, make the magnetic resonance imaging of proving installation truer, thereby guarantee precision of test result.

[description of drawings]

Fig. 1 is the structural representation that is used for the proving installation of magnetic resonance imaging in the prior art;

The image that Fig. 2 generates for geometry test;

Fig. 3 is the inner structure synoptic diagram of proving installation shown in Figure 1;

Synoptic diagram when Fig. 4 is perfusion MR semiochemicals;

Fig. 5 is the image when containing gas column in the cavity;

Fig. 6 is the structural representation that is used for the proving installation of magnetic resonance imaging in the utility model;

Fig. 7 is the inner structure synoptic diagram of proving installation shown in Figure 6;

The inner structure synoptic diagram that is used for the proving installation of magnetic resonance imaging in another embodiment of Fig. 8 the utility model.

[embodiment]

The utility model will be further described below in conjunction with drawings and Examples.

See also Fig. 6 to Fig. 7, the utility model be used for proving installation 100 to the magnetic resonance image (MRI) quality evaluation comprise shell body 10, place shell body 10 inside body 13, be arranged on the body 13 and several cavitys 12, the pod apertures 14 that is arranged on body 13 and arranged on left and right sides of extending at above-below direction, the diversion trench 16 that is arranged on body 13 upper and lower sides.

Shell body 10 and body 13 are made by the material that does not produce the MR signal, tygon for example, organic glass etc.Cavity 12 extends along the vertical direction, and several cavitys 12 form array of cavities.Generally all below 5mm, the size of pod apertures 14 is relatively large for the size design of cavity 12 smaller, diameter, and diameter is more than or equal to 2cm.Diversion trench 16 is connected with cavity 12.Be positioned at the pod apertures 14 of body 13 both sides respectively by being arranged on perfusing hole 11 and the exhausr port 15 and extraneous conducting on the shell body 10.Described perfusing hole 11 and exhausr port 15 are arranged in the top of the diversion trench 16 that is positioned at body 13 upsides and are connected with corresponding diversion trench 16.

In the perfusion proving installation, open perfusing hole 11 and exhausr port 15.Potting compound flows to the diversion trench 16 of body 13 downsides along pod apertures 14 by perfusing hole 11, because the internal diameter of pod apertures 14 is bigger, therefore potting compound can arrive diversion trench 16 by pod apertures 14 very soon, after diversion trench 16 had been full of potting compound, potting compound can penetrate in the cavity 12 owing to action of pressure.Because body 13 upper air vents 15 are in open mode, so the air in the cavity can free flow (direction of arrow among the figure), can be not compressed because of enclosure space, and cause pressure rises, and stop potting compound to enter cavity 12.Optionally, if perfusing hole 11 sizes are bigger, the side at exhausr port 15 places does not arrange pod apertures.

In the above-mentioned embodiment, the size of cavity 12 is identical on above-below direction, in other embodiments, according to the purposes of test module, can be designed to other shape, ginseng Fig. 8, each cavity 12 has one or more bulges 120, the cross section of bulge 120 can be circle, triangle, rectangle etc., simultaneously, and bulge 120 of a plurality of cavity 12 common connections.

Though the utility model discloses as above with preferred embodiment; so it is not in order to limit the utility model; any those skilled in the art; in not breaking away from spirit and scope of the present utility model; when doing a little modification and perfect, therefore protection domain of the present utility model is worked as with being as the criterion that claims were defined.

Claims

1. proving installation that is used for magnetic resonance imaging, comprise shell body, place the body of shell body inside, body is provided with several cavitys that extends along the vertical direction, the upper and lower side of body is provided with diversion trench, diversion trench is connected with cavity, and the upside of shell body is provided with perfusing hole, it is characterized in that: a side of described body also is provided with pod apertures, pod apertures is connected with diversion trench, and by perfusing hole and extraneous conducting.

2. the proving installation for magnetic resonance imaging as claimed in claim 1 is characterized in that, an other side of described body is provided with another pod apertures.

3. the proving installation for magnetic resonance imaging as claimed in claim 2 is characterized in that, the upside of described shell body is provided with exhausr port, and exhausr port is positioned at the top of another pod apertures.

4. the proving installation for magnetic resonance imaging as claimed in claim 1 is characterized in that, described several cavitys form array of cavities.

5. the proving installation for magnetic resonance imaging as claimed in claim 1 is characterized in that, has bulge on the described cavity.

6. the proving installation for magnetic resonance imaging as claimed in claim 5 is characterized in that, the cross section of described bulge is triangle or circle or rectangle.

7. the proving installation for magnetic resonance imaging as claimed in claim 5 is characterized in that, described bulge is communicated with several cavitys.

8. the proving installation for magnetic resonance imaging as claimed in claim 1 is characterized in that, the diameter of described pod apertures is big than the diameter of cavity.

9. the proving installation for magnetic resonance imaging as claimed in claim 8 is characterized in that, the diameter of described pod apertures is more than or equal to 2cm.

10. as each described proving installation for magnetic resonance imaging of claim 1-9, it is characterized in that described body is made by tygon or organic glass.