CN104921725A - Method and device for detecting working condition of radio frequency coil - Google Patents
Method and device for detecting working condition of radio frequency coil Download PDFInfo
- Publication number
- CN104921725A CN104921725A CN201410100243.2A CN201410100243A CN104921725A CN 104921725 A CN104921725 A CN 104921725A CN 201410100243 A CN201410100243 A CN 201410100243A CN 104921725 A CN104921725 A CN 104921725A
- Authority
- CN
- China
- Prior art keywords
- coil unit
- unit group
- coil
- signal
- data acquisition
- 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.)
- Pending
Links
Abstract
The present invention provides a method and device for detecting working conditions of a radio frequency coil. The method comprises carrying out pre-scanning once on an imaging object in a scanning field of view before carrying out magnetic resonance examination; receiving a magnetic resonance signal generated by the imaging object by using the radio frequency coil, the radio frequency coil containing at least one coil unit group, and each coil unit group including at least one coil unit which is matched with a data collection channel; calculating a signal to noise ratio of each data collection channel according to the magnetic resonance signals output by the data collection channels; and determining working conditions of the coil unit groups according to the signal to noise ratios of the data collection channels. The method is simple and easy to operate, a user can timely find out abnormal conditions of the radio frequency coil, and influences caused by radio frequency coil abnormities on image quality are avoided.
Description
Technical field
The present invention relates to nuclear magnetic resonance (MRI) technical field, particularly relate to a kind of method detecting radio-frequency coil duty in magnetic resonance equipment.
Background technology
The surperficial phased-array coil (phased array coils) occurred in recent years is a quantum leap of radiofrequency coil technology, a phased-array coil is made up of multiple coil unit (element), needs multiple data acquisition channel (channel) simultaneously and matches.On current novel high field MRI instrument clinically, the subelement of its phased-array coil is general all more than 8 with the data acquisition channel matched, and equipment component has reached 16 or 32.Utilize phased-array coil can significantly improve the signal to noise ratio of MR image, contribute to the picture quality improving thin slice scan, high resolution scanning and low field machine.
Separate between multiple data acquisition channels of a phased-array coil, whether the signal that can be collected by subchannel analysis detects its duty normal.The coil unit or data acquisition channel that break down if exist, the Signal-to-Noise collected under causing this passage is too low, or affects the signal to noise ratio of entire image.Therefore, be necessary to provide information on interactive interface, the duty of prompting operator or doctor's phased-array coil and data acquisition channel.
In existing magnetic resonance system, generally do not carry out real-time phased-array coil and detect, but when service engineering teacher does periodic maintenance to system, the duty of phased-array coil is checked.Like this, damage if in use there is phased-array coil and data acquisition channel, can not Timeliness coverage, so that all can the picture quality of influential system within a period of time.
Summary of the invention
The object of this invention is to provide a kind of method detecting radio-frequency coil duty, enable user find the exception of radio-frequency coil in real time.
For solving the problem, the invention provides a kind of method detecting radio-frequency coil duty, comprising the following steps: a) before carrying out magnetic resonance examination, a prescan is carried out to the imaging object being positioned at scan vision; B) utilize radio-frequency coil to receive the magnetic resonance signal of described imaging object generation, described radio-frequency coil comprises at least one coil unit group, and described coil unit group comprises at least one coil unit, and described coil unit mates with a data acquisition channel; C) according to the magnetic resonance signal that described data acquisition channel exports, the signal to noise ratio of each described data acquisition channel is calculated; D) according to the signal to noise ratio of described data acquisition channel, the duty of described coil unit group is judged.
Further, described steps d) the middle step judging the duty of described coil unit group, be specially: successively the signal to noise ratio of all data acquisition channels corresponding for coil unit group and threshold value are compared, if the signal to noise ratio of all data acquisition channels that this coil unit group is corresponding is all higher than described threshold value, judge that this coil unit group is normal; Otherwise, judge that this coil unit group occurs abnormal.
Further, described steps d) the middle step judging the duty of described coil unit group, be specially: successively the signal to noise ratio of all data acquisition channels corresponding for coil unit group and threshold value are compared, if the signal to noise ratio of all data receiving channels that this coil unit group is corresponding is all higher than described threshold value, judge that this coil unit group is normal; If the signal to noise ratio of all data acquisition channels that this coil unit group is corresponding is all lower than described threshold value, judge that this coil unit group is positioned at outside scan vision; If the signal to noise ratio of the part data acquisition passage that this coil unit group is corresponding is lower than described threshold value, judge that signal to noise ratio corresponding to this coil unit group is damaged lower than the data acquisition channel of described threshold value.
Further, described radio-frequency coil comprises multiple coil unit group, and the signal to noise ratio of all data acquisition channels that coil unit group is corresponding and same threshold value compare, and threshold value corresponding to different coil unit group can be different.
Further, also comprise: when judging to occur abnormal with or without coil unit group, send information by voice or interactive interface to user.
Further, when judging to occur abnormal with or without coil unit group, information is sent by remote service to user.
Further, when having judged that coil unit group occurs abnormal, describedly send in the step of information by voice or interactive interface to user, described information comprises the position that abnormal coil unit group occurs.
For achieving the above object, present invention also offers a kind of device detecting radio-frequency coil duty, comprise with lower unit:
For before carrying out magnetic resonance examination, the imaging object being positioned at scan vision is carried out to the pre-scanning unit of a prescan;
For receiving the radio-frequency coil of the magnetic resonance signal that imaging object produces, described radio-frequency coil comprises at least one coil unit group, and described coil unit group comprises at least one coil unit, and described coil unit mates with a data acquisition channel;
For the magnetic resonance signal exported according to described data acquisition channel, calculate the computing unit of the signal to noise ratio of each described data acquisition channel;
For the signal to noise ratio according to described data acquisition channel, judge the judging unit of the duty of described coil unit group.
Further, also comprising for when judging to occur abnormal with or without coil unit group, sending the Tip element of information by voice or interactive interface to user.
Further, also comprising for when judging to occur abnormal with or without coil unit group, being sent the Tip element of information by remote service to user.
The method and apparatus of detection radio-frequency coil duty provided by the invention, all a prescan can be carried out before each image scanning, the work state information of radio-frequency coil can be obtained by the MR signal analyzing prescan collection, not only method is simple to operation, and user can the abnormal conditions of Timeliness coverage radio-frequency coil, avoid because of radio-frequency coil anomalous effects picture quality.
Accompanying drawing illustrates:
Fig. 1 is the schematic flow sheet of the method for detection radio-frequency coil duty provided by the invention;
Fig. 2 is the structural representation of a kind of existing body flexible surface coils;
Fig. 3 is the structural representation of the device of detection radio-frequency coil duty provided by the invention.
Detailed description of the invention:
For enabling above-mentioned purpose of the present invention, feature and advantage become apparent more, are described in detail the specific embodiment of the present invention below in conjunction with drawings and Examples.
In magnetic resonance system, radio-frequency coil have transmitting coil and receiving coil point.The proton that transmitting coil is launched in radio-frequency pulse (radio wave) exciting human resonates, just as the transmitting antenna in radio station; Receiving coil receives the MR signal (being also a kind of radio wave) sent in human body, just as wireless antenna.Coils all in theory all can be used as transmitting coil and receiving coil, but the radio-frequency field that most surface coils is launched is very uneven, usually be not used as transmitting coil, therefore general only as receiving coil, the work of transmitting coil is born by the body coil be installed in main magnet.The method of detection radio-frequency coil duty of the present invention, be only applicable to the surface coils for received RF pulse, as head coil, shoulder coil, knee coil, wrist coil etc., do not comprise the body coil for launching radio-frequency pulse be installed in main magnet.
Fig. 1 is the schematic flow sheet of the method for detection radio-frequency coil duty provided by the invention.Please refer to Fig. 1, before carrying out magnetic resonance examination, the region at least partially comprising the imaging object of area-of-interest is placed in scan vision, prescan is performed to the imaging object being positioned at scan vision.In pre-scanning process, the MR signal sent in imaging object is received by surface coils.
Be applicable to surface coils of the present invention, have the coil unit of the reception MR signal of varying number, each coil unit has a data acquisition channel to match.Such as, some surface coils have the coil unit of 24 Received signal strength, and some surface coils but only have the coil unit of several Received signal strength.Please refer to Fig. 2, is a kind of body flexible surface coils shown in figure.This surface coils tool six is for receiving the coil unit of MR signal, and these six coil units form coil array.According to the relative position of each coil unit and area-of-interest, be coil unit group by these six coil unit Further Divisions.In the present embodiment, three coil units being positioned at dotted line A1A2 the same side are divided into First Line coil unit group; Three coil units being positioned at dotted line A1A2 opposite side are divided into the second coil unit group, obtain two coil unit groups altogether.Certainly, the dividing mode of coil unit is not limited in above-described embodiment, alternatively, the coil unit of adjacent two or other numbers can also be divided into a coil unit group, and the number of the coil unit that each coil unit group comprises can be different.
Each data acquisition channel is delivered to computer system after carrying out the process such as filtering to the MR signal collected, and computer system receives data, and carries out computation and analysis to received data.The data that computer system utilizes each data acquisition channel to carry, calculate the signal to noise ratio of this data acquisition channel, then in units of coil unit group, the signal to noise ratio of all data acquisition channels corresponding to coil unit group is analyzed, and then judges whether this coil unit group exception occurs.
The signal to noise ratio of the above-mentioned all data acquisition channels corresponding to coil unit group is analyzed, and then judges the step of duty of this coil unit group, comprises numerous embodiments.A kind of concrete embodiment is: the signal to noise ratio of all data acquisition channels corresponding for coil unit group and threshold value are compared successively, if the signal to noise ratio of all data acquisition channels that this coil unit group is corresponding is all higher than described threshold value, judge that this coil unit group is normal; Otherwise, judge that this coil unit group occurs abnormal.Another kind of concrete embodiment is: the signal to noise ratio of all data acquisition channels corresponding for coil unit group and threshold value are compared successively, if the signal to noise ratio of all data receiving channels that this coil unit group is corresponding is all higher than described threshold value, judge that this coil unit group is normal; If the signal to noise ratio of all data acquisition channels that this coil unit group is corresponding is all lower than described threshold value, judge that this coil unit group is positioned at outside scan vision; If the signal to noise ratio of the part data acquisition passage that this coil unit group is corresponding is lower than described threshold value, judge that signal to noise ratio corresponding to this coil unit group is damaged lower than the data acquisition channel of described threshold value.
It should be noted that, when a radio-frequency coil comprises multiple coil unit group, the signal to noise ratio of all data acquisition channels that coil unit group is corresponding and same threshold value compare, and threshold value corresponding to different coil unit group can be different.Be described for the surface coils shown in Fig. 2 below, three coil units that First Line coil unit group comprises have a data acquisition channel to match respectively, the signal to noise ratio of these three data acquisition channels calculated by computer system and threshold value E1 are compared, threshold value E1 can pre-set as required.In like manner, the signal to noise ratio of the data acquisition channel that each coil unit comprised with the second coil unit group mates and threshold value E2 compare.Threshold value corresponding to different coil unit group can be different, and namely threshold value E1, E2 can be the same or different, and specifically will determine according to factors such as the relative positions of the physiological feature of area-of-interest and each coil unit group and area-of-interest.In the specific implementation, user rule of thumb can also set threshold value corresponding to each coil unit group.
When judging according to aforesaid way to occur abnormal with or without coil unit group, also needing to send information to user, making user learn the work state information of radio-frequency coil.A kind of embodiment is: send information by voice or interactive interface to user.Alternatively, information can also be sent by remote service to user.When having judged that coil unit group occurs abnormal, send in the step of information above by voice or interactive interface to user, described information comprises the position that abnormal coil unit group occurs.
Based on the method for above-mentioned detection radio-frequency coil duty, present invention also offers the device of the duty of detection radio-frequency coil as shown in Figure 3, comprise with lower unit: for before carrying out magnetic resonance examination, the imaging object being positioned at scan vision is carried out to the pre-scanning unit of a prescan; For receiving the radio-frequency coil of the magnetic resonance signal that imaging object produces, described radio-frequency coil comprises at least one coil unit group, and described coil unit group comprises at least one coil unit, and described coil unit mates with a data acquisition channel; For the magnetic resonance signal exported according to described data acquisition channel, calculate the computing unit of the signal to noise ratio of each described data acquisition channel; For the signal to noise ratio according to described data acquisition channel, judge the judging unit of the duty of described coil unit group.
Preferably, also comprising Tip element, for when judging to occur abnormal with or without coil unit group, sending information by voice or interactive interface to user.Alternatively, above-mentioned Tip element can also send the Tip element of information to user by remote service.
In sum, the method and apparatus of detection radio-frequency coil duty provided by the invention, all a prescan can be carried out before each image scanning, the work state information of radio-frequency coil can be obtained by the MR signal analyzing prescan collection, not only method is simple to operation, and user can the abnormal conditions of Timeliness coverage radio-frequency coil, avoid because of radio-frequency coil anomalous effects picture quality.
Although the present invention discloses as above with preferred embodiment; so itself and be not used to limit the present invention, any those skilled in the art, without departing from the spirit and scope of the present invention; when doing a little amendment and perfect, therefore protection scope of the present invention is when being as the criterion of defining with claims.
Claims (10)
1. detect a method for radio-frequency coil duty, it is characterized in that, comprise the following steps:
A) before carrying out magnetic resonance examination, a prescan is carried out to the imaging object being positioned at scan vision;
B) utilize radio-frequency coil to receive the magnetic resonance signal of described imaging object generation, described radio-frequency coil comprises at least one coil unit group, and described coil unit group comprises at least one coil unit, and described coil unit mates with a data acquisition channel;
C) according to the magnetic resonance signal that described data acquisition channel exports, the signal to noise ratio of each described data acquisition channel is calculated;
D) according to the signal to noise ratio of described data acquisition channel, the duty of described coil unit group is judged.
2. the method for claim 1, it is characterized in that, described steps d) the middle step judging the duty of described coil unit group, be specially: successively the signal to noise ratio of all data acquisition channels corresponding for coil unit group and threshold value are compared, if the signal to noise ratio of all data acquisition channels that this coil unit group is corresponding is all higher than described threshold value, judge that this coil unit group is normal; Otherwise, judge that this coil unit group occurs abnormal.
3. the method for claim 1, it is characterized in that, described steps d) the middle step judging the duty of described coil unit group, be specially: successively the signal to noise ratio of all data acquisition channels corresponding for coil unit group and threshold value are compared, if the signal to noise ratio of all data receiving channels that this coil unit group is corresponding is all higher than described threshold value, judge that this coil unit group is normal; If the signal to noise ratio of all data acquisition channels that this coil unit group is corresponding is all lower than described threshold value, judge that this coil unit group is positioned at outside scan vision; If the signal to noise ratio of the part data acquisition passage that this coil unit group is corresponding is lower than described threshold value, judge that signal to noise ratio corresponding to this coil unit group is damaged lower than the data acquisition channel of described threshold value.
4. method as claimed in claim 2 or claim 3, it is characterized in that, described radio-frequency coil comprises multiple coil unit group, and the signal to noise ratio of all data acquisition channels that coil unit group is corresponding and same threshold value compare, and threshold value corresponding to different coil unit group can be different.
5. the method for claim 1, is characterized in that, also comprises: when judging to occur abnormal with or without coil unit group, send information by voice or interactive interface to user.
6. the method for claim 1, is characterized in that, also comprises: when judging to occur abnormal with or without coil unit group, send information by remote service to user.
7. the method as described in claim 5 or 6, it is characterized in that, when having judged that coil unit group occurs abnormal, describedly send in the step of information by voice or interactive interface to user, described information comprises the position that abnormal coil unit group occurs.
8. detect a device for radio-frequency coil duty, it is characterized in that, comprise with lower unit:
For before carrying out magnetic resonance examination, the imaging object being positioned at scan vision is carried out to the pre-scanning unit of a prescan;
For receiving the radio-frequency coil of the magnetic resonance signal that imaging object produces, described radio-frequency coil comprises at least one coil unit group, and described coil unit group comprises at least one coil unit, and described coil unit mates with a data acquisition channel;
For the magnetic resonance signal exported according to described data acquisition channel, calculate the computing unit of the signal to noise ratio of each described data acquisition channel;
For the signal to noise ratio according to described data acquisition channel, judge the judging unit of the duty of described coil unit group.
9. device as claimed in claim 8, is characterized in that, also comprising for when judging to occur abnormal with or without coil unit group, sending the Tip element of information by voice or interactive interface to user.
10. device as claimed in claim 8, is characterized in that, also comprising for when judging to occur abnormal with or without coil unit group, being sent the Tip element of information by remote service to user.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410100243.2A CN104921725A (en) | 2014-03-18 | 2014-03-18 | Method and device for detecting working condition of radio frequency coil |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410100243.2A CN104921725A (en) | 2014-03-18 | 2014-03-18 | Method and device for detecting working condition of radio frequency coil |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104921725A true CN104921725A (en) | 2015-09-23 |
Family
ID=54109411
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410100243.2A Pending CN104921725A (en) | 2014-03-18 | 2014-03-18 | Method and device for detecting working condition of radio frequency coil |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104921725A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109425842A (en) * | 2017-08-31 | 2019-03-05 | 西门子(深圳)磁共振有限公司 | The coil selection method and MR imaging apparatus of MR imaging apparatus |
| CN112019474A (en) * | 2020-08-14 | 2020-12-01 | 深圳鑫德瑞电气科技有限公司 | Multi-channel signal wireless transmission system and control method for physical resource grid distribution |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1821804A (en) * | 2005-02-15 | 2006-08-23 | 株式会社东芝 | Magnetic resonance imaging apparatus and its control method |
| US20080129298A1 (en) * | 2006-02-17 | 2008-06-05 | Vaughan J T | High field magnetic resonance |
| CN101268943A (en) * | 2007-03-19 | 2008-09-24 | 株式会社东芝 | Magnetic resonance imaging apparatus and method, magnetic-resonance imaging maintenance apparatus and system |
| CN101793949A (en) * | 2010-03-05 | 2010-08-04 | 厦门大学 | X-nuclear channel broadband pre-amplifier of high-field nuclear magnetic resonance spectrometer |
| US20100308840A1 (en) * | 2009-06-05 | 2010-12-09 | Ulrich Nerreter | Method and device to detect failure of a magnetic resonance gradient coil by monitoring a supply cable thereof |
| CN103376435A (en) * | 2012-04-28 | 2013-10-30 | 上海联影医疗科技有限公司 | Coil testing device and coil testing method |
-
2014
- 2014-03-18 CN CN201410100243.2A patent/CN104921725A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1821804A (en) * | 2005-02-15 | 2006-08-23 | 株式会社东芝 | Magnetic resonance imaging apparatus and its control method |
| US20080129298A1 (en) * | 2006-02-17 | 2008-06-05 | Vaughan J T | High field magnetic resonance |
| CN101268943A (en) * | 2007-03-19 | 2008-09-24 | 株式会社东芝 | Magnetic resonance imaging apparatus and method, magnetic-resonance imaging maintenance apparatus and system |
| US20100308840A1 (en) * | 2009-06-05 | 2010-12-09 | Ulrich Nerreter | Method and device to detect failure of a magnetic resonance gradient coil by monitoring a supply cable thereof |
| CN101793949A (en) * | 2010-03-05 | 2010-08-04 | 厦门大学 | X-nuclear channel broadband pre-amplifier of high-field nuclear magnetic resonance spectrometer |
| CN103376435A (en) * | 2012-04-28 | 2013-10-30 | 上海联影医疗科技有限公司 | Coil testing device and coil testing method |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109425842A (en) * | 2017-08-31 | 2019-03-05 | 西门子(深圳)磁共振有限公司 | The coil selection method and MR imaging apparatus of MR imaging apparatus |
| CN112019474A (en) * | 2020-08-14 | 2020-12-01 | 深圳鑫德瑞电气科技有限公司 | Multi-channel signal wireless transmission system and control method for physical resource grid distribution |
| CN112019474B (en) * | 2020-08-14 | 2023-08-15 | 平康(深圳)医疗设备科技有限公司 | Multichannel signal wireless transmission system and physical resource grid allocation control method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP4760967B2 (en) | Radio station identification device, radio station identification method, radio station identification program | |
| CN104395772A (en) | Magnetic resonance image reconstruction method with respiratory mot detection during sampling of central and peripheral k- space areas | |
| CN104569745B (en) | Live testing apparatus for local discharge and method | |
| CN106249114A (en) | Multifunctional belt electric detection means based on WIFI transmission and method | |
| CN106199237A (en) | The system of test device antenna | |
| CN103926547B (en) | RF identification tester calibration steps | |
| CN104921725A (en) | Method and device for detecting working condition of radio frequency coil | |
| US11740308B2 (en) | Removing RF interference of pilot tone signal in MRI system | |
| JP6835582B2 (en) | Electromagnetic interference wave measuring device, electromagnetic interference wave measuring method, and electromagnetic interference wave measuring program | |
| CN105339805B (en) | The MRI with multi-channel coil of channel selecting is used navigation equipment | |
| CN202486949U (en) | Handheld terminal and device detecting system using the same | |
| CN103974410B (en) | Method and apparatus for positioning | |
| CN109581055A (en) | A kind of transformer winding fault type detection method based on Multiresolution Decomposition method | |
| CN108271244A (en) | The localization method and device of mobile terminal | |
| CN104161516A (en) | Magnetic resonance imaging direction judging method and device | |
| JP5103715B2 (en) | Method and program for identifying source of electromagnetic interference signal | |
| CN107276597A (en) | A kind of two benches frequency spectrum perception optimization method based on USRPN200 | |
| CN204633783U (en) | The wireless anti-cheating device of detecting sweep-frequency Békésy audiometer | |
| CN112964938B (en) | Lightning single-station positioning method, device and system based on artificial intelligence | |
| JP5282914B2 (en) | Radio identification device | |
| CN104771165B (en) | A kind of imaging method and device | |
| CN211528589U (en) | Converter station high-frequency partial discharge detection system capable of eliminating interference | |
| CN208780782U (en) | A kind of chip multistation test system | |
| CN104572388B (en) | Data filtering system, data filtering device and method | |
| CN216982132U (en) | Multi-mode portable positioning equipment based on radio frequency environment measurement |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB02 | Change of applicant information |
Address after: 201815 Shanghai City, Jiading District Jiading Industrial Zone No. 1180 Building 8 Hing Road Applicant after: Shanghai Lianying Medical Technology Co., Ltd Address before: 201815 Shanghai City, Jiading District Jiading Industrial Zone No. 1180 Building 8 Hing Road Applicant before: SHANGHAI UNITED IMAGING HEALTHCARE Co.,Ltd. |
|
| CB02 | Change of applicant information |