CN202494773U - Pelvic-part radio-frequency coil component for magnetic resonance imaging - Google Patents
Pelvic-part radio-frequency coil component for magnetic resonance imaging Download PDFInfo
- Publication number
- CN202494773U CN202494773U CN2012201405980U CN201220140598U CN202494773U CN 202494773 U CN202494773 U CN 202494773U CN 2012201405980 U CN2012201405980 U CN 2012201405980U CN 201220140598 U CN201220140598 U CN 201220140598U CN 202494773 U CN202494773 U CN 202494773U
- Authority
- CN
- China
- Prior art keywords
- frequency coil
- radio
- magnetic resonance
- signal
- radio frequency
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Images
Landscapes
- Magnetic Resonance Imaging Apparatus (AREA)
Abstract
The utility model discloses a pelvic-part radio-frequency coil component for magnetic resonance imaging. The pelvic-part radio-frequency coil component comprises two laminated radio-frequency coil units, which respectively comprise six annular units, the six annular units are divided into two rows along the head-feet direction of a human body, and each row comprises three annular units arranged in sequence. The pelvic-part radio-frequency coil component of the utility model has the advantages of favorable multidirectional performance of magnetic resonance signals, high signal to noise ratio in imaging, good image definition and large observable range.
Description
Technical field
The utility model relates to the medical treatment detection device field, is specifically related to a kind of pelvic part radio frequency coil assemblies that is used for magnetic resonance imaging.
Background technology
Magnetic resonance imaging (MRI) system adopts the uniform strong magnetic field of autonomous magnetic system (to be called that MRI system main field-B0) spin polarizes to the hydrogen nuclei in the human body.Magnetic polarization nuclear spin produces magnetic moment i in human body.This magnetic moment points to the main field direction when stable state, if do not encourage disturbance then can not produce Useful Information.
Excite magnetic moment to produce nuclear magnetic resonance (NMR) signal through uniform radio frequency (RF) magnetic field (be called and excite magnetic field or B1 magnetic field), thereby obtain magnetic resonance imaging system (MRI) data.Radio-frequency sending coil produces B1 magnetic field at the image-region of required detection, and this radio-frequency sending coil is driven by the computer-controlled radiofrequency launcher that receives that adopts power amplifier.In excitation process, the nuclear spin system absorbs energy, makes magnetic moment around the precession of main field direction.After exciting, the magnetic moment of precession will experience free induction decay (FID), discharge the energy of its absorption and return stable state.In free induction decay (FID), use to be placed near the received RF coil that human body is excited the part and to survey nuclear magnetic resonance (NMR) signal.This nuclear magnetic resonance (NMR) signal is second voltage (or electric current) that is in the received RF coil, and this voltage (or electric current) is induced by the precession magnetic moment of tissue.The received RF coil can be that transmitting coil itself also can be the absolute coil that receives only radiofrequency signal.Gradient coil through being integrated in the main field system produces the extra-pulse gradient magnetic; Optionally excite the interior atomic nucleus of voxel of required position; And can carry out frequency coding and phase encoding to signal; Thereby confirm its volume coordinate, finally pass through Fourier transform, set up a complete magnetic resonance imaging.
In magnetic resonance imaging system (MRI), the homogeneity in the magnetic field that transmitting coil and receiving coil produced is a key factor that obtains high quality graphic.In the magnetic resonance imaging system of standard, adopt whole-body radio frequency coil to obtain best exciting field homogeneity usually for emission.Whole-body radio frequency coil is a radio-frequency coil maximum in the system.But, if use bigger coil to receive simultaneously, then can produce lower signal to noise ratio (snr), this mainly is because the signal generation tissue distance of such coil and imaging is far away.Because in magnetic resonance imaging system (MRI), the most important thing is high s/n ratio (SNR), receive to improve the signal to noise ratio (snr) of required probe portion so adopt special-purpose coil to carry out radio frequency.But; Because the shape of each physiological location of human body has nothing in common with each other; Very irregular again, and size also difference is very big, so how according to the physiological structure characteristics at each position of human body; Arrange coil circuit dexterously, be coil design personnel's maximum task in the world thereby obtain comparatively uniformly Distribution of Magnetic Field and bigger detection sensitivity always.
In practicality, design preferable special-purpose radio-frequency coil and should have following function: high s/n ratio (SNR), good homogeneity, the high-altitude charge material amount factor (Q) of resonant circuit.In addition, pelvic part radio-frequency coil (10) must be designed to be suitable for patient-operated and have comfort level, and between patient and radio frequency electric equipment, the protection barrier is provided.A kind of method that improves signal to noise ratio (S/N ratio) is that quadrature receives.In this method, by two of the same area that covers required detection mutually independently coil survey two signals.The radiofrequency signal signal to noise ratio (S/N ratio) that adopts quadrature to receive be when adopting single linearity coil situation doubly.A kind of in addition method that improves signal to noise ratio (S/N ratio) is the phased-array coil technology.For a bigger zone is carried out to picture, if use single bigger coil, the noise of the All Ranges that coil covered all gets into coil, so poor signal to noise.If the use phased-array technique uses a plurality of independently small coils to cover this zone together, could get into coil owing to only close on the noise of the very zonule of coil, therefore can improve signal to noise ratio (S/N ratio) effectively.
The pelvic part coil has important use to be worth in clinical magnetic resonance imaging, can be used for diagnosing the pathology of the prostate that is positioned at the Intrapelvic organ of human body, the for example male sex and women's physiological location such as uterus, ovary.Pelvic part magnetic resonance imaging at present mainly contains dual mode; A kind of mode is to use body coil to carry out pelvic part imaging, but owing to receive with body coil, during reception and the signal tissue distance of imaging far away; Fill factor, curve factor is less, and signal to noise ratio (S/N ratio) is lower when therefore being generally picture.
Another kind of mode is to use special-purpose plug-in type radio-frequency coil, in use coil is inserted inside of human body (like rectum, female private part etc.), and this will cause patient to feel very uncomfortable.And, in use needing strict sterilization, and will carry out processing such as intestinal lavage patient, process is complicated.In addition,, otherwise be difficult to keep treating the long-time transfixion of imaging region only if patient is carried out anaesthetic treatment, but simultaneously because the range of observation of this tube base coil is less, the imaging when being not easy to diagnose.
In addition; Traditional magnetic resonance phased-array coil can only use the magnetic resonance signal of a direction, and magnetic resonance signal itself is in the plane perpendicular to static magnetic field, to rotate, and the signal that makes traditional magnetic resonance phased-array coil gather is fewer; Signal to noise ratio (S/N ratio) is lower, and image definition is not enough.
The utility model content
The technical matters that the utility model will solve provides the pelvic part radio frequency coil assemblies that is used for magnetic resonance imaging that the multidirectional performance of a kind of magnetic resonance signal is good, signal to noise ratio (S/N ratio) is higher, but the good range of observation of image definition is bigger when forming images.
For solving the problems of the technologies described above, the technical scheme that the utility model adopts is:
A kind of pelvic part radio frequency coil assemblies that is used for magnetic resonance imaging; Two radio-frequency coil unit that comprise arranged stacked; Said radio-frequency coil unit is made up of six annular elements, and said six annular elements are divided into two rows along human body head pin direction, and each package contains three annular elements that are arranged in order.
Further improvement as the utility model technical scheme:
Overlap between adjacent any two annular elements in said six annular elements and arrange.
Said pelvic part radio frequency coil assemblies comprises that also being used to said annular element provides the radio frequency of radio-frequency signal source to synthesize divider; The synthetic divider of said radio frequency is made up of two 4 port 90 degree compositors; The synthetic divider of said radio frequency comprises three signal input unit and three output signal channels, and said three output signal channels link to each other with the radio-frequency coil unit respectively.
The utlity model has following advantage: the utility model comprises two radio-frequency coil unit of arranged stacked; The radio-frequency coil unit is made up of six annular elements; Six annular elements are divided into two rows along human body head pin direction; Each package contains three annular elements that are arranged in order, and applies certain phase shifts through the signal that 3 annular elements along the human body left and right directions are detected, and can constitute the equivalent orthogonal coil through synthetic; Can conveniently gather the signal of X, Y direction; Make the circular polarisation magnetic resonance signal of prostatic to be detected effectively, theoretical signal to noise ratio (S/N ratio) can improve 0.4 times, and the multidirectional performance of magnetic resonance signal is good, higher, the bigger advantage of the good range of observation of image definition of when imaging signal to noise ratio (S/N ratio) but have.
Description of drawings
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art; To do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below; Obviously, the accompanying drawing in describing below only is some embodiment of the utility model, for those of ordinary skills; Under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the three-dimensional decomposition texture synoptic diagram of the utility model embodiment.
Fig. 2 is the structural representation of radio-frequency coil unit among the utility model embodiment.
Fig. 3 is the distribution schematic diagram of six annular elements in the radio-frequency coil unit among the utility model embodiment.
Fig. 4 is the circuit theory synoptic diagram of the synthetic divider of radio frequency among the utility model embodiment.
Fig. 5 is the sensitivity profile of annular element 1 among the utility model embodiment.
Fig. 6 is the sensitivity profile of annular element 2 among the utility model embodiment.
Fig. 7 is the sensitivity profile of annular element 3 among the utility model embodiment.
Fig. 8 is one group of 3 sensitivity profile that annular element is direct-connected among the utility model embodiment.
Fig. 9 be among the utility model embodiment one group of 3 annular element through the sensitivity profile of compositor.
Figure 10 is the sensitivity profile of one group 3 annular elements, second output channel behind compositor among the utility model embodiment.
Figure 11 is the sensitivity profile of one group of 3 annular element the 3rd output channel behind compositor among the utility model embodiment.
Figure 12 is the sensitivity profile of one group of 3 annular element after second output channel and the 3rd output channel are connected to system behind the compositor among the utility model embodiment.
Embodiment
Below in conjunction with accompanying drawing the preferred embodiments of the present invention are set forth in detail, thereby protection scope of the present invention is made more explicit defining so that advantage of the present invention and characteristic can be easier to it will be appreciated by those skilled in the art that.
As shown in Figure 1; The pelvic part radio frequency coil assemblies that present embodiment is used for magnetic resonance imaging comprises two radio-frequency coil unit of arranged stacked; The radio-frequency coil unit is made up of six annular elements; Six annular elements are divided into two rows along human body head pin direction, and each package contains three annular elements that are arranged in order.
As shown in Figure 2; In six annular elements of present embodiment, overlap between adjacent any two annular elements and arrange, make that the coupling between adjacent any two annular elements is minimum; Centre at coil FOV obtains higher signal sensitivity, improves signal to noise ratio (S/N ratio).
The pelvic part radio frequency coil assemblies of present embodiment comprises that also being used to annular element provides the radio frequency of radio-frequency signal source to synthesize divider; The synthetic divider of radio frequency is made up of two 4 port 90 degree compositors; The synthetic divider of radio frequency comprises three signal input unit and three output signal channels, and three output signal channels link to each other with the radio-frequency coil unit respectively.As shown in Figure 3; The left side is 14 port 90 degree compositors in the circuit diagram, and the right side is another 4 port, 90 degree compositors, and the unit 1 among the figure, unit 2, unit 3 refer to three signal input unit respectively; Passage 1 among the figure, passage 2, passage 3 refer to three output signal channels respectively; Therefore respectively corresponding 4 annular elements of each output signal channel through the usage quantity of conditioning signal input block, can realize exporting 4,8 or 12 radio-frequency channels.
As shown in Figure 4; The radio-frequency coil unit of present embodiment is made up of six annular elements (1,2,3,4,5,6); The annular element 1,2,3 of radio-frequency coil unit, upper strata, lower floor radio-frequency coil unit and annular element 4,5,6 are divided into two rows along human body head pin direction; Each row is made up of three annular elements arranging along the human body left and right directions, carries out suitable overlapping between two rows, makes that coupling each other is minimum; Centre at coil FOV obtains higher signal sensitivity, improves signal to noise ratio (S/N ratio).Three unit of each row form one group, have 4 groups, choose one group of three unit that is positioned at the human body Lower Half and calculate, and that is to say that area-of-interest is the top of these three unit.Fig. 5, Fig. 6 and Fig. 7 be respectively in one group of three annular element first, the sensitivity profile of second and the 3rd annular element.If these 3 annular elements all are directly connected to magnetic resonance system, then system needs 12 radio frequency reception channel altogether.Fig. 8 is exactly that these three annular elements are directly linked the signal sensitivity profile that obtains behind the magnetic resonance system.
If be not directly connected to system to three passages in each group, but the synthetic divider of process radio frequency carries out the synthetic processing of signal in advance, and then the signal of three passages of compositor output will be different fully with the signal of three annular elements that do not synthesize.At first annular element 1 and annular element 3 usefulness one 90 degree quadrature compositors (one of them unit need carry out suitable phase shift earlier) are carried out the synthetic processing of signal, make two output ports of this compositor comprise respectively these two annular elements in the same way and reverse signal.Wherein, signal is directly exported as the output channel 3 of compositor in the same way, and its spatial sensitivity distributes shown in figure 11, and its signal intensity in the human body pelvic part left and right sides is stronger, and the signal intensity of zone line a little less than.And reverse signal is equivalent to annular element 1 and annular element 3 are combined into a butterfly (or 8 fonts) unit in essence; The direction of its signal is along the human body left and right directions, and the output signal of this port is synthesized with annular element 2 usefulness another one quadrature compositors again.Because the sense of annular element 2 is along human body AP direction; Therefore this two paths of signals has the character of quadrature; The sense of rotation of two paths of signals one road and magnetic resonance signal self of output is consistent and greatly enhancing (be called quadrature, suppose it is the output channel 2 of compositor here) is shown in figure 10; And another road is as shown in Figure 9 because greatly reduce (be called anti-quadrature, supposition is the output channel 1 of compositor) mutually on the contrary here with the sense of rotation of magnetic resonance signal self.Therefore the output signal on this road can be given it up.
Carry out if desired the whole pelvic part of human body is carried out to picture; And magnetic resonance system has 8 or above radio frequency reception channel, and then the output channel 2 with the compositor of this coil is connected to magnetic resonance system with passage 3, and the spatial sensitivity after the signal of these two passages is synthetic distributes shown in figure 12; Be directly connected to magnetic resonance system institute picked up signal susceptibility space distribution to Figure 12 and three circular passages; Be that Fig. 8 compares, can find out, regional apart from coil plane 10-15cm; Be the vitals position such as prostate, uterus, ovary of human body pelvic part, its signal intensity much at one.And in the zone near coil plane, i.e. the zone of 0-5cm, the intensity of signal has and obviously weakens; And be skin and subcutaneous fat etc. here; Region of clinical interest normally, more weak signal intensity makes image look very even on the contrary, and helps the imaging of sequences such as fat suppression.In this case, magnetic resonance system needs 8 radio frequency input receiving cables altogether.And if the radio frequency receiver number of magnetic resonance system is limited, then only need the orthogonal signal that intensity is stronger to be connected to magnetic resonance system, just can equally obtain the blur-free imaging of vitals such as prostate, uterus, the spatial sensitivity of its signal distributes and sees Figure 10.In this case, magnetic resonance system needs 4 radio frequency input receiving cables altogether.
The above is merely the preferred implementation of the utility model, and the protection domain of the utility model is not limited in above-mentioned embodiment, and every technical scheme that belongs to the utility model principle all belongs to the protection domain of the utility model.For a person skilled in the art, some improvement and the retouching under the prerequisite of the principle that does not break away from the utility model, carried out, these improvement and retouching also should be regarded as the protection domain of the utility model.
Claims (3)
1. pelvic part radio frequency coil assemblies that is used for magnetic resonance imaging; It is characterized in that: two radio-frequency coil unit that comprise arranged stacked; Said radio-frequency coil unit is made up of six annular elements; Said six annular elements are divided into two rows along human body head pin direction, and each package contains three annular elements that are arranged in order.
2. the pelvic part radio frequency coil assemblies that is used for magnetic resonance imaging according to claim 1 is characterized in that: overlap between adjacent any two annular elements in said six annular elements and arrange.
3. the pelvic part radio frequency coil assemblies that is used for magnetic resonance imaging according to claim 1; It is characterized in that: said pelvic part radio frequency coil assemblies comprises that also being used to said annular element provides the radio frequency of radio-frequency signal source to synthesize divider; The synthetic divider of said radio frequency is made up of two 4 port 90 degree compositors; The synthetic divider of said radio frequency comprises three signal input unit and three output signal channels, and said three output signal channels link to each other with the radio-frequency coil unit respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012201405980U CN202494773U (en) | 2012-04-06 | 2012-04-06 | Pelvic-part radio-frequency coil component for magnetic resonance imaging |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012201405980U CN202494773U (en) | 2012-04-06 | 2012-04-06 | Pelvic-part radio-frequency coil component for magnetic resonance imaging |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202494773U true CN202494773U (en) | 2012-10-17 |
Family
ID=47000996
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012201405980U Expired - Lifetime CN202494773U (en) | 2012-04-06 | 2012-04-06 | Pelvic-part radio-frequency coil component for magnetic resonance imaging |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202494773U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111273206A (en) * | 2020-03-27 | 2020-06-12 | 苏州众志医疗科技有限公司 | Magnetic resonance radio frequency array coil and device and magnetic resonance imaging method |
-
2012
- 2012-04-06 CN CN2012201405980U patent/CN202494773U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111273206A (en) * | 2020-03-27 | 2020-06-12 | 苏州众志医疗科技有限公司 | Magnetic resonance radio frequency array coil and device and magnetic resonance imaging method |
| CN111273206B (en) * | 2020-03-27 | 2022-05-27 | 苏州众志医疗科技有限公司 | Magnetic resonance radio frequency array coil and device and magnetic resonance imaging method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Marques et al. | Low‐field MRI: An MR physics perspective | |
| He et al. | Use of 2.1 MHz MRI scanner for brain imaging and its preliminary results in stroke | |
| US9915712B2 (en) | System and method for magnetic resonance coil arrangement | |
| US20040183534A1 (en) | Diagonal-arranged quadrature MRI radio frequency array coil system for three dimensional parallel imaging | |
| EP2539726B1 (en) | Rf antenna arrangement and method for multi nuclei mr image reconstruction involving parallel mri | |
| CN102914751B (en) | Local coil with multiple shim coils capable of being individually turned off | |
| Wetterling et al. | Whole body sodium MRI at 3T using an asymmetric birdcage resonator and short echo time sequence: first images of a male volunteer | |
| US20050107686A1 (en) | RF array coil system and method for magnetic resonance imaging | |
| US6930480B1 (en) | Head coil arrays for parallel imaging in magnetic resonance imaging | |
| US6377836B1 (en) | RF coil array for vertical field MRI | |
| CN203773037U (en) | Mammary-gland magnetic-resonance radiofrequency receiving coil of magnetic-resonance imaging system | |
| CN102018512A (en) | Pelvic-part RF (radio-frequency) coil for magnetic res.onance imaging | |
| US20150309132A1 (en) | Apparatus, method and coil array for providing split parallel transmission magnetic resonance imaging | |
| CN102481114A (en) | Signal acquisition and processing method and apparatus for magnetic resonance imaging | |
| Sadeghi-Tarakameh et al. | Optimizing the topography of transmit coils for SAR management | |
| US20140097838A1 (en) | Split birdcage coil, devices, and methods | |
| US20050122111A1 (en) | Cervical-thoracic-lumbar spine phased array coil for horizontal field MRI systems | |
| CN202494773U (en) | Pelvic-part radio-frequency coil component for magnetic resonance imaging | |
| US8143893B2 (en) | Thin extended-cavity RF coil for MRI | |
| US20230251335A1 (en) | Rf receiver coil with equal perimeter loops | |
| CN202196164U (en) | Infant whole-body radio-frequency coil device for magnetic resonance imaging system | |
| CN207730921U (en) | Flexible shoulder joint coil device for magnetic resonance imaging | |
| CN100577098C (en) | The pelvic part coil device that is used for nuclear magnetic resonance | |
| US6900635B1 (en) | Head RF quadrature coil array for parallel imaging | |
| CN205229437U (en) | A experiment on mice RF coil device for magnetic resonance imaging |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee | ||
| CP02 | Change in the address of a patent holder |
Address after: Qingpu District of Shanghai city in 201707 Huaqing Road No. 1269 Patentee after: Shanghai Chengguang Medical Technologies Co.,Ltd. Address before: 201107 building 1199, Lane 8, Ji Zhai Road, Shanghai, Minhang District Patentee before: Shanghai Chengguang Medical Technologies Co.,Ltd. |
|
| CX01 | Expiry of patent term |
Granted publication date: 20121017 |
|
| CX01 | Expiry of patent term |