CN110007258B - Method and device for determining position of receiving coil of magnetic resonance system - Google Patents
Method and device for determining position of receiving coil of magnetic resonance system Download PDFInfo
- Publication number
- CN110007258B CN110007258B CN201910403107.3A CN201910403107A CN110007258B CN 110007258 B CN110007258 B CN 110007258B CN 201910403107 A CN201910403107 A CN 201910403107A CN 110007258 B CN110007258 B CN 110007258B
- Authority
- CN
- China
- Prior art keywords
- coil
- obtaining
- receiving coil
- unit
- coil unit
- 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.)
- Active
Links
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
- G01R33/28—Details of apparatus provided for in groups G01R33/44 - G01R33/64
- G01R33/32—Excitation or detection systems, e.g. using radio frequency signals
- G01R33/36—Electrical details, e.g. matching or coupling of the coil to the receiver
- G01R33/3628—Tuning/matching of the transmit/receive coil
Abstract
The invention discloses a method and a device for determining the position of a receiving coil of a magnetic resonance system. Therefore, the method can automatically obtain the position and form information of the receiving coil only according to the theoretical coordinate of each coil unit and the actual coordinate acquired from the echo signal without manual participation, reduces the working difficulty of an MRI equipment operator, reduces the possibility of imaging errors caused by personal errors of the operator, and improves the accuracy of magnetic resonance imaging.
Description
Technical Field
The invention relates to the technical field of medical equipment, in particular to a method and a device for determining the position of a receiving coil of a magnetic resonance system.
Background
Magnetic Resonance Imaging (MRI) is one of the main Imaging modes of modern medical Imaging, has the advantages of high soft tissue resolution, no radioactive damage, diversified Imaging parameters and the like, and is widely applied to clinical diagnosis. The basic working principle of magnetic resonance imaging is that firstly, radio frequency pulses are utilized to excite hydrogen atomic nuclei in a human body, then, a gradient field is adopted to carry out space encoding, then, a receiving coil is utilized to receive echo signals, and Fourier transform reconstruction is utilized to obtain image information. The receiving coil comprises a plurality of coil units, and each coil unit is led out to the connector through a cable and is connected into the magnetic resonance system through the connector.
The receiving coil can adopt a fixed-shape coil or a flexible coil. Because the electronic components welding of flexible coil is on flexible printed circuit board, and the outside is also wrapped up by flexible insulating material, make flexible coil have light and the good advantage of toughness, therefore can rotate flexible coil or form change such as folding when using, make flexible coil can match with the suitable type of different health positions (such as belly, knee joint, ankle joint, wrist joint etc.), so as to be close to the formation of image region as far as possible, so can solve because of scanning position shape and the difference of size and lead to the unable problem of hugging closely the formation of image region of fixed shape coil, thereby signal-to-noise ratio has been improved.
In addition, in order to further improve the signal-to-noise ratio, not only the receiving coil needs to be as close to the imaging region as possible, but also the coil unit closest to the imaging region needs to be selected for reconstruction imaging. However, since the flexible coil can flexibly perform the shape change and the position change according to the actual application scene, when the MRI apparatus operator uses the flexible coil, the operator needs to construct a three-dimensional model of the magnetic resonance system, the patient and the flexible coil in the brain to determine the position information and the shape information of the flexible coil, and then select the coil unit corresponding to the scanning region to perform the reconstruction imaging according to the position information and the shape information of the flexible coil.
However, since the operator of the MRI apparatus needs to determine the form information and the position information of the flexible coil according to personal experience and related knowledge, not only the difficulty of the operation of the magnetic resonance system and the working strength of the operator are increased, but also imaging errors are easily caused by personal errors of the operator, and the accuracy of magnetic resonance imaging is reduced.
Disclosure of Invention
In order to solve the technical problems in the prior art, the invention provides a method and a device for determining the position of a receiving coil of a magnetic resonance system, which can automatically acquire the position information and the form information of the receiving coil without manual participation, reduce the working difficulty of an MRI (magnetic resonance imaging) equipment operator, reduce the possibility of imaging errors caused by personal errors of the operator, and improve the accuracy of magnetic resonance imaging.
The present application provides a method of determining the position of a receive coil of a magnetic resonance system, wherein the receive coil comprises a plurality of coil units, the method comprising:
collecting echo signals of each channel during magnetic resonance scanning;
obtaining actual coordinates of each coil unit relative to the center of the magnet according to the echo signals;
acquiring form information of the receiving coil according to the actual coordinates and theoretical coordinates of each coil unit in an original state;
and obtaining the position of the receiving coil according to the form information and the actual coordinate.
Optionally, the obtaining the actual coordinate of each coil unit relative to the center of the magnet according to the echo signal specifically includes:
reconstructing a two-dimensional image corresponding to each coil unit according to the echo signals; the two-dimensional image includes positional information of the coil unit with respect to the center of the magnet;
and obtaining the coordinates of the gravity center of the corresponding two-dimensional image relative to the center of the magnet according to the position information of the coil units, and taking the coordinates as the actual coordinates of each coil unit relative to the center of the magnet.
Optionally, the obtaining the form information of the receiving coil according to the actual coordinates and the theoretical coordinates of each coil unit in the original state specifically includes:
obtaining a theoretical value of a vector formed by connecting central points of any two coil units according to the theoretical coordinates;
obtaining the measurement value of the vector according to the actual coordinate;
obtaining the rotation angles of any two coil units relative to the corresponding original states according to the theoretical values and the measured values;
obtaining the number of the rotation angles falling into a preset angle range;
when the number exceeds a preset number, determining that the receiving coil has a rotation angle theta relative to the original state; otherwise, the receiving coil is determined to be in a folded state.
Optionally, the determining that the receiving coil has a rotation angle θ relative to the original state specifically includes:
and carrying out statistical analysis according to the preset angle range and the preset number to obtain the rotation angle theta of the receiving coil relative to the original state.
Optionally, the obtaining the position of the receiving coil according to the morphological information and the actual coordinate specifically includes:
and when the receiving coil is in a folded state, obtaining the position of the receiving coil according to the weight corresponding to each coil unit and the actual coordinate.
Optionally, the obtaining the position of the receiving coil according to the morphological information and the actual coordinate specifically includes:
and when the receiving coil has a rotation angle theta relative to the original state, obtaining the position of the receiving coil according to the weight corresponding to each coil unit, the actual coordinate, the theoretical coordinate and the theta.
The present application further provides an apparatus for determining a position of a receive coil of a magnetic resonance system, the receive coil comprising a plurality of coil units, the apparatus comprising:
the acquisition unit is used for acquiring echo signals of all channels during magnetic resonance scanning;
the actual coordinate obtaining unit is used for obtaining the actual coordinate of each coil unit relative to the center of the magnet according to the echo signal;
a form information obtaining unit for obtaining form information of the receiving coil according to the actual coordinates of each coil unit and theoretical coordinates in an original state;
and the position obtaining unit is used for obtaining the position of the receiving coil according to the form information and the actual coordinate.
Optionally, the actual coordinate obtaining unit specifically includes:
the reconstruction subunit is used for reconstructing a two-dimensional image corresponding to each coil unit according to the echo signals; the two-dimensional image includes positional information of the coil unit with respect to the center of the magnet;
and the actual coordinate obtaining subunit is used for obtaining the coordinate of the gravity center of the corresponding two-dimensional image relative to the center of the magnet according to the position information of the coil units, and taking the coordinate as the actual coordinate of each coil unit relative to the center of the magnet.
Optionally, the form information obtaining unit specifically includes:
the theoretical value obtaining subunit is used for obtaining a theoretical value of a vector formed by connecting central points of any two coil units according to the theoretical coordinates;
a measured value obtaining subunit, configured to obtain a measured value of the vector according to the actual coordinate;
the rotation angle obtaining subunit is used for obtaining the rotation angles of any two coil units relative to the corresponding original states according to the theoretical values and the measured values;
a number obtaining subunit, configured to obtain the number of the rotation angles falling within a preset angle range;
the determining subunit is used for determining that the receiving coil has a rotation angle theta relative to the original state when the number exceeds a preset number; otherwise, the receiving coil is determined to be in a folded state.
Optionally, the location obtaining unit includes a location obtaining subunit;
and the position obtaining subunit is configured to, when the receiving coil has a rotation angle θ relative to an original state, obtain the position of the receiving coil according to the weight, the actual coordinate, the theoretical coordinate, and the θ corresponding to each coil unit.
The present application further provides a storage medium comprising a stored program, wherein the program performs the method of determining a position of a receive coil of a magnetic resonance system as set forth in any one of the above.
The present application further provides a processor for executing a program, wherein the program is executed to perform the method for determining the position of a receiving coil of a magnetic resonance system as described in any one of the above.
Compared with the prior art, the invention has at least the following advantages:
according to the method for determining the position of the receiving coil of the magnetic resonance system, the actual coordinate of each coil unit relative to the center of the magnet is obtained according to the echo signal collected by the receiving coil, the form information of the receiving coil is obtained according to the actual coordinate of each coil unit and the theoretical coordinate in the original state, and the position of the receiving coil is obtained according to the form information and the actual coordinate. Therefore, the method can automatically obtain the position and form information of the receiving coil only according to the theoretical coordinate of each coil unit and the actual coordinate acquired from the echo signal without manual participation, reduces the working difficulty of an MRI equipment operator, reduces the possibility of imaging errors caused by personal errors of the operator, and improves the accuracy of magnetic resonance imaging.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present application, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic structural diagram of a magnetic resonance system according to an embodiment of the present application;
fig. 2 is a schematic structural diagram of a receiving coil provided in an embodiment of the present application;
FIG. 3 is a schematic diagram of a flexible coil according to an embodiment of the present disclosure in use;
figure 4 is a flow chart of a method for determining the position of a receive coil of a magnetic resonance system according to one embodiment of the present application;
fig. 5 is a flowchart of a method for determining a position of a receiving coil of a magnetic resonance system according to a second embodiment of the present application;
fig. 6 is a flowchart of an implementation manner of S502 provided in an embodiment of the present application;
fig. 7 is a flowchart of an implementation manner of S5022 provided in an embodiment of the present application;
fig. 8 is a schematic structural diagram of a theoretical value of a vector formed by connecting center points of two coil units according to an embodiment of the present application;
fig. 9 is a schematic structural diagram of a control device according to an embodiment of the present application;
fig. 10 is a schematic structural diagram of an apparatus for determining a position of a receive coil of a magnetic resonance system according to an embodiment of the present application.
Detailed Description
With the development of medical device technology, MRI has become one of the main imaging modalities of modern medical imaging. Because MRI has the advantages of high soft tissue resolution, no radioactive damage, diversified imaging parameters and the like, MRI is widely applied to clinical diagnosis.
MRI can work based on magnetic resonance phenomena, and its working principle can be specifically: firstly, exciting hydrogen atomic nuclei in a human body by utilizing radio frequency pulses; then, spatial coding is carried out by adopting a gradient field; and then, according to the echo signals received by the receiving coil, image information is obtained by utilizing Fourier transform reconstruction.
For the purpose of explaining the operating principle of MRI, it will be explained with reference to fig. 1.
Referring to fig. 1, a schematic structural diagram of a magnetic resonance system according to an embodiment of the present application is shown.
As shown in fig. 1, the operation principle of MRI is specifically: firstly, a radio frequency transmitting coil transmits radio frequency pulses to a human body, so that the radio frequency pulses excite hydrogen atomic nuclei in the human body; secondly, the gradient coil adopts a gradient field to carry out spatial coding; then, the echo signals are received by the receiving coil 101, and image information is obtained by fourier transform reconstruction.
MRI generally employs a receiving coil for echo signal acquisition, and the receiving coil is composed of a plurality of coil units, each of which is led out to a connector through a cable and is connected to a magnetic resonance system through the connector.
For convenience of explanation and understanding, a receiving coil including 4 coil units will be described as an example.
Referring to fig. 2, the figure is a schematic structural diagram of a receiving coil provided in an embodiment of the present application.
The receiving coil 201 shown in fig. 2 includes: a first coil unit 2011, a second coil unit 2012, a third coil unit 2013, and a fourth coil unit 2014. Wherein the first coil unit 2011 is drawn out to the connector 202 by the first cable; the second coil unit 2012 is led out to the connector 202 through the second cable; the third coil unit 2013 is led out to the connector 202 through a third cable; the fourth coil unit 2014 is drawn out to the connector 202 through the fourth cable.
The receiving coil can adopt a fixed-shape coil or a flexible coil. Because the electronic components welding of flexible coil is on flexible printed circuit board, and the outside is also wrapped up by flexible insulating material, make flexible coil have light and the good advantage of toughness, therefore can rotate flexible coil or change form such as folding when using, make flexible coil can match with the suitable type of different health positions (such as belly, knee joint, ankle joint, wrist joint etc.), so as to be close to the formation of image region as far as possible, so can solve because of scanning position shape and the difference of size and lead to the unable problem of hugging closely the formation of image region of fixed shape coil, thereby signal-to-noise ratio has been improved.
Referring to fig. 3, the figure is a schematic diagram of the shape and position of the flexible coil provided by the embodiment of the present application when in use.
As shown in fig. 3, since the original state of the flexible coil can be matched with the shape of the abdomen of the human body, when the abdomen of the patient is subjected to magnetic resonance imaging, the flexible coil can be placed on the abdomen of the patient in the original state as shown in (a).
Since the rotation of the flexible coil by 90 ° can match the shape of the left chest of the human body, when the heart of the patient is subjected to magnetic resonance imaging, the flexible coil can be rotated by 90 ° and placed on the left chest of the patient as shown in (b).
Since the folded flexible coil can match the shape of the knee joint of the human body, when the knee joint of the patient is subjected to magnetic resonance imaging, the flexible coil can be wrapped on the knee joint of the patient in a folded state as shown in (c).
In addition, in order to further improve the signal-to-noise ratio, not only the receiving coil needs to be as close to the imaging region as possible, but also the coil unit closest to the imaging region needs to be selected for reconstruction imaging. However, since the flexible coil can flexibly perform the shape change and the position change according to the actual application scene, when the MRI apparatus operator uses the flexible coil, the operator needs to construct a three-dimensional model of the magnetic resonance system, the patient and the flexible coil in the brain to determine the position information and the shape information of the flexible coil, and then select the coil unit corresponding to the scanning region to perform the reconstruction imaging according to the position information and the shape information of the flexible coil.
However, since the operator of the MRI apparatus needs to determine the form information and the position information of the flexible coil according to personal experience and related knowledge, not only the difficulty of the operation of the magnetic resonance system and the working strength of the operator are increased, but also imaging errors are easily caused by personal errors of the operator, and the accuracy of magnetic resonance imaging is reduced.
Therefore, in order to solve the above technical problem, an embodiment of the present invention provides a method for determining a position of a receiving coil of a magnetic resonance system, where the method includes obtaining an actual coordinate of each coil unit with respect to a center of a magnet according to an echo signal acquired by the receiving coil, obtaining morphological information of the receiving coil according to the actual coordinate of each coil unit and a theoretical coordinate in an original state, and obtaining the position of the receiving coil according to the morphological information and the actual coordinate. Therefore, the method can automatically obtain the position and form information of the receiving coil only according to the theoretical coordinate of each coil unit and the actual coordinate acquired from the echo signal without manual participation, reduces the working difficulty of an MRI equipment operator, reduces the possibility of imaging errors caused by personal errors of the operator, and improves the accuracy of magnetic resonance imaging.
In order to make the technical solutions of the present application better understood, the following detailed description of the embodiments of the present application will be given with reference to the accompanying drawings in the embodiments of the present application for clear and complete description, and it is obvious that the described embodiments are only a part of the embodiments of the present application, not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The first embodiment of the method comprises the following steps:
referring to fig. 4, a flowchart of a method for determining a position of a receive coil of a magnetic resonance system according to an embodiment of the present application is shown.
The method for determining the position of the receiving coil of the magnetic resonance system provided by the embodiment of the application comprises the following steps:
s401: and acquiring echo signals of all channels during magnetic resonance scanning.
The receiving coil includes a plurality of coil units, and each coil unit can receive an echo signal.
Magnetic resonance scanning may in particular employ a way of encoding a certain physical axis direction with a read gradient.
As a specific embodiment, S401 may specifically be: all coil units of the receiving coil acquire echo signals during magnetic resonance scanning.
S402: actual coordinates of each coil unit with respect to the center of the magnet are obtained from the echo signals.
The same echo signal can be received by a plurality of coil units, but due to the different positions of the different coil units, the echo signals received by the different coil units have different characteristics, and the characteristics can reflect the position information of each coil unit. For example, the signal amplitude value characteristics corresponding to the echo signals received by different coil units are different.
Thus, after receiving the echo signals using the receiving coils, the actual coordinates of each coil unit with respect to the center of the magnet can be obtained from the echo signals received by each coil unit.
As a specific implementation manner, S402 may specifically be: acquiring the actual coordinate of the ith coil unit relative to the center of the magnet according to the echo signal received by the ith coil unit; wherein i is more than or equal to 1 and less than or equal to N, and N is the total number of coil units in the receiving coil.
S403: and acquiring the form information of the receiving coil according to the actual coordinates of each coil unit and the theoretical coordinates in the original state.
The shape information refers to spatial shape information of the receiver coil, for example, the receiver coil is in a folded shape or the receiver coil is rotated by a preset angle.
The original state means: the receiver coil is not rotated and does not have a corresponding state when folded. As shown in fig. 3, the receiving coil in (a) is in an original state.
The theoretical coordinates refer to: when the receiving coil is in an original state, physical position information of each coil unit.
As an example, when the receiving coil includes N coil units, then the theoretical coordinate of the ith coil unit in the original state is Pi＝(xi,yi) Wherein i is a positive integer, and i is more than or equal to 1 and less than or equal to N; piA theoretical coordinate value representing the ith coil unit; x is the number ofiAn abscissa value representing a theoretical coordinate of the ith coil unit; y isiAnd an ordinate value indicating a theoretical coordinate of the i-th coil unit.
The theoretical coordinates of each coil unit in the original state may be stored in a preset position in advance. For example, the theoretical coordinates of each coil unit in the original state may be stored in a preset file in advance; or, the theoretical coordinates of each coil unit in the original state can be stored in a preset memory in advance; alternatively, the theoretical coordinates of each coil unit in the original state may be stored in advance in a preset file and a preset memory, respectively.
When the receiving coil is rotated or folded, the actual spatial position of each coil unit in the receiving coil is changed relative to the theoretical spatial position in the original state.
As an example, as shown in fig. 3, when the receiving coil shown in (a) is in an original state, the receiving coil of (b) is obtained by rotating the receiving coil of (a) by 90 °, and at this time, each coil unit of (b) is obtained by rotating the corresponding coil unit of (a) by 90 °; (c) the receiving coil of (b) is obtained by folding the receiving coil of (a), and in this case, each coil unit of (c) is obtained by rotating the corresponding coil unit of (a) by different angle values.
Thus, when the theoretical coordinates and the actual coordinates of each coil unit in the original state are obtained, the difference of the actual state from the original state of each coil unit can be obtained based on the theoretical coordinates and the actual coordinates of each coil unit in the original state, so as to obtain the form information of the receiving coil based on the difference of the actual state from the original state.
S404: and obtaining the position of the receiving coil according to the morphological information and the actual coordinates.
Since the form information can represent actual form information of the receiving coil and the actual coordinates can represent actual spatial position information of each coil unit in the receiving coil with respect to the center of the magnet, when the form information of the receiving coil and the actual coordinates of each coil unit with respect to the center of the magnet are determined, the position information of the receiving coil can be obtained from the form information of the receiving coil and the actual coordinates of the receiving coil.
At the moment, an operator of the MRI equipment can directly select the coil unit corresponding to the scanning area to carry out reconstruction imaging according to the obtained position information and the form information of the receiving coil, the operator is not required to construct a three-dimensional model of a magnetic resonance system, a patient and a flexible coil in the brain, and the working difficulty of the operator is reduced.
According to the method for determining the position of the receiving coil of the magnetic resonance system, the actual coordinate of each coil unit relative to the center of the magnet is obtained according to the echo signal collected by the receiving coil, the form information of the receiving coil is obtained according to the actual coordinate of each coil unit and the theoretical coordinate in the original state, and the position of the receiving coil is obtained according to the form information and the actual coordinate. Therefore, the method can automatically obtain the position and form information of the receiving coil only according to the theoretical coordinate of each coil unit and the actual coordinate acquired from the echo signal without manual participation, reduces the working difficulty of an MRI equipment operator, reduces the possibility of imaging errors caused by personal errors of the operator, and improves the accuracy of magnetic resonance imaging.
In order to further improve the accuracy of the obtained receiving coil position and the morphological information, the present application also provides another implementation of the method for determining the receiving coil position of the magnetic resonance system, which will be explained and explained below with reference to the accompanying drawings.
Method embodiment two
For the sake of brevity, the second method embodiment is an improvement on the first method embodiment, and details of the second method embodiment and the first method embodiment are not repeated herein.
Referring to fig. 5, it is a flowchart of a method for determining a position of a receiving coil of a magnetic resonance system according to a second embodiment of the present application.
The method for determining the position of the receiving coil of the magnetic resonance system provided by the embodiment of the application comprises the following steps:
s501: and acquiring echo signals of all channels during magnetic resonance scanning.
The specific implementation of S501 is the same as that of S401, and for brevity, is not described again here.
S502: actual coordinates of each coil unit with respect to the center of the magnet are obtained from the echo signals.
Because the two-dimensional images reconstructed according to the echo signals received by different coil units are different due to different positions of different coil units, in the embodiment of the present application, the position information of each coil can be determined according to the two-dimensional image corresponding to each coil.
Therefore, an implementation manner of S502 is also provided in the embodiments of the present application. For ease of explanation and understanding, reference will now be made to FIG. 6.
Referring to fig. 6, this figure is a flowchart of an implementation manner of S502 provided in an embodiment of the present application.
As an embodiment, S502 may specifically be:
s5021: reconstructing a two-dimensional image corresponding to each coil unit according to the echo signals; the two-dimensional image includes positional information of the coil unit with respect to the center of the magnet.
S5022: and obtaining the coordinate of the gravity center of the corresponding two-dimensional image relative to the center of the magnet according to the position information of the coil units, and taking the coordinate as the actual coordinate of each coil unit relative to the center of the magnet.
Since the position information of the coil unit relative to the center of the magnet included in the two-dimensional image can be obtained by projecting the two-dimensional image in the coordinate system of the magnetic resonance system and according to the intensity characteristics of the projection signal, the position information of the coil unit relative to the center of the magnet can be obtained in the embodiment of the present application from the projection signal of the two-dimensional image in the coordinate system of the magnetic resonance system. Thus, the present application also provides a specific embodiment of S5022, which will be explained and explained with reference to fig. 7.
Referring to fig. 7, the figure is a flowchart of an implementation manner of S5022 provided in an embodiment of the present application.
As an embodiment, S5022 may specifically be:
s50221: and projecting the two-dimensional image of each coil unit in the X direction in a coordinate system of the magnetic resonance system, and obtaining the X-axis coordinate of the gravity center of the two-dimensional image of each coil unit relative to the center of the magnet according to the intensity characteristic of the projection signal in the X direction.
S50222: and projecting the two-dimensional image of each coil unit in the Y direction in a coordinate system of the magnetic resonance system, and obtaining the Y-axis coordinate of the gravity center of the two-dimensional image of each coil unit relative to the center of the magnet according to the intensity characteristic of the projection signal in the Y direction.
S50223: and obtaining the X-axis coordinate of the actual coordinate of each coil unit relative to the center of the magnet according to the X-axis coordinate of the gravity center of the two-dimensional image of each coil unit relative to the center of the magnet, and obtaining the Y-axis coordinate of the actual coordinate of each coil unit relative to the center of the magnet according to the Y-axis coordinate of the gravity center of the two-dimensional image of each coil unit relative to the center of the magnet.
It should be noted that there is no fixed execution sequence between S50221 and S50222, and S50221 and S50222 may be executed in sequence, or S50222 and S50221 may be executed in sequence.
S503: and obtaining a theoretical value of a vector formed by connecting central points of any two coil units according to the theoretical coordinates.
The vector formed by connecting the central points of any two coil units can be used for representing the spatial relationship between the two coil units.
The theoretical value of the vector is a vector value formed by connecting central points of any two coil units when the receiving coil is in an original state.
For the convenience of explanation and understanding of the theoretical values of the vectors, reference will be made to the following description in conjunction with the accompanying drawings.
Referring to fig. 8, the graph is a schematic structural diagram of a theoretical value of a vector formed by connecting center points of two coil units according to an embodiment of the present application.
The receiving coil shown in fig. 8 is in an original state, and a vector between a center point of the first coil unit and a center point of the second coil unit in the receiving coil is P15And, P15And the theoretical value is used for representing a vector formed by connecting the central point of the first coil unit and the central point of the second coil unit.
In fig. 8, a theoretical value of a vector formed by connecting the center points of the first coil unit and the second coil unit is illustrated as an example, and a theoretical value of a vector formed by connecting center points of other coil units may be P15The obtaining method of (1) is not described herein for brevity.
In addition, in the embodiment of the application, a vector formed by connecting the central point of each coil unit with the central point of other coil units except the coil unit in the receiving coil can be obtained, so that the accuracy rate of acquiring the position information and the form information of the receiving coil unit is improved; it is also possible to select a part of the coil units from all the coil units and obtain a vector formed by connecting the center points of each selected coil unit with the center points of other selected coil units except the selected coil unit, so as to improve the efficiency of acquiring the position information and the shape information of the receiving coil unit.
S504: and obtaining the measurement value of a vector formed by connecting the central points of any two coil units according to the actual coordinates.
The measured value of the vector is the actual vector value formed by connecting the central points of any two coil units when the receiving coil is used. At the moment, if the receiving coil is used in an original state, the measured value of a vector formed by connecting central points of any two coil units is the same as a corresponding theoretical value; if the receiving coil is used in a rotating or folding mode, the measured value of a vector formed by connecting central points of any two coil units is different from a corresponding theoretical value, and a certain included angle exists between the theoretical value and the measured value.
Therefore, in the embodiment of the present application, the shape information of the receiving coil can be determined according to the included angle between the theoretical value and the measured value of the vector formed by the central point connecting lines of different coil units.
S505: and obtaining the rotation angles of any two coil units relative to the corresponding original states according to the theoretical values and the measured values.
The rotation angle of any two coil units relative to the corresponding original state is the included angle between the measured value and the theoretical value of the vector formed by connecting the central points of any two coil units.
Various methods for calculating the included angle between different vectors can be adopted in the present application, and for convenience of explanation and understanding, the present application will be described by taking one calculation method as an example.
As a specific embodiment, S505 may specifically be: and (3) obtaining the rotation angle of any two coil units relative to the corresponding original state by using a calculation formula (1) according to the theoretical value and the measured value.
In the formula, thetaabThe included angle between the measured value and the theoretical value of a vector formed by connecting central points of the a-th coil unit and the b-th coil unit is included; mabThe measured value of a vector formed by connecting central points of the a-th coil unit and the b-th coil unit is obtained; t isabThe theoretical value of a vector formed by connecting the central points of the a-th coil unit and the b-th coil unit.
S506: the number of the rotation angles falling within the preset angle range is obtained.
The preset angle range can be preset or determined according to the actual application scene.
As an example, the preset angle range may be preset to [ θ ]T-k,θT+k,]And k is 0-30, wherein thetaTIs determined according to the actual application scene.
As an embodiment, S506 may specifically be: and obtaining the number of the rotating angles falling into the preset angle range by using a statistical analysis method.
S507: judging whether the number exceeds a preset number, if so, executing S508; if not, go to S510.
The predetermined number may be predetermined. For example, when the receiving coil includes N coil units, the preset number N may be preset as: n is larger than or equal to j × N, wherein j can be determined according to the actual application scene.
If the angle falls within the preset angle range [ theta ]T-k,θT+k,]The number of the rotation angles exceeds the preset number, the rotation angles of any two coil units relative to the corresponding original states can be determined to be basically the same, and are all thetaTTherefore, the form change that the receiving coil rotates when in use can be determined; if the angle falls within the preset angle range [ theta ]T-k,θT+k,]The number of the rotation angles of the coil units does not exceed the preset number, a certain difference exists between the rotation angles of any two coil units corresponding to the original state, and therefore the receiving can be determinedThe coil undergoes a folded form change during use.
S508: it is determined that the receiving coil exists a rotation angle theta with respect to the original state.
As an embodiment, S508 may specifically be: and carrying out statistical analysis according to the preset angle range and the preset number to obtain the rotation angle theta of the receiving coil relative to the original state.
For example, if it falls within a preset angle range [ theta ]T-k,θT+k,]The number of the rotation angles exceeds the preset number, the rotation angles of any two coil units relative to the corresponding original states can be determined to be basically the same, and are all thetaTThus, it can be determined that the receiving coil exists at a rotation angle θ ═ θ from the original stateT。
S509: and obtaining the position of the receiving coil according to the weight, the actual coordinate, the theoretical coordinate and theta corresponding to each coil unit.
The weight corresponding to each coil unit may be preset, for example, the weight corresponding to each coil unit may be determined according to the distance of each coil unit from the center of the magnet, and the weight corresponding to the coil unit that is farther from the center of the magnet is smaller.
As an embodiment, S509 may specifically be: and (3) obtaining the position of the receiving coil by using a calculation formula (2) according to the weight, the actual coordinate, the theoretical coordinate and the theta corresponding to each coil unit.
Wherein Pos is the position of the receiving coil; m is the detected data of the coil units, m is less than or equal to N, and N is the number of the coil units included by the receiving coil; wts (E)i) The weight corresponding to the ith coil unit; eiActual coordinates of the ith coil unit; piThe theoretical coordinates of the ith coil unit are shown; theta is the rotation angle of the receiving coil relative to the original state.
It should be noted that, in some cases, the actual coordinates of some coil units cannot be obtained because the signal-to-noise ratio of the coil units is low due to the fact that the coil units are far from the center of the magnet, and at this time, only m coil units can be obtained, so that when the position of the receiving coil is obtained by using the calculation formula (2), only m coil units need to be obtained.
S510: it is determined that the receiving coil is in a folded state.
S511: and obtaining the position of the receiving coil according to the corresponding weight and the actual coordinate of each coil unit.
As an embodiment, S511 may specifically be: and (4) obtaining the position of the receiving coil by using a calculation formula (3) according to the corresponding weight and the actual coordinate of each coil unit.
Wherein Pos is the position of the receiving coil; m is the detected data of the coil units, m is less than or equal to N, and N is the number of the coil units included by the receiving coil; wts (E)i) The weight corresponding to the ith coil unit; eiIs the actual coordinate of the ith coil unit.
According to the method for determining the position of the receiving coil of the magnetic resonance system, the theoretical value and the measured value of the vector formed by connecting the central points of any two coil units are respectively obtained according to the theoretical coordinate and the actual coordinate of each coil unit, the rotating angles of any two coil units relative to the corresponding original state are obtained according to the theoretical value and the measured value, so that the form information of the receiving coil is determined according to the number of the rotating angles falling into the preset angle range, and the position of the receiving coil is determined according to the form information of the receiving coil, the theoretical coordinate and the actual coordinate of each coil unit. Thus, the accuracy of magnetic resonance imaging can be further improved.
The method for determining the position of the receiving coil of the magnetic resonance system provided by the above method embodiments can be executed by the control device shown in fig. 9. The control device shown in fig. 9 includes a processor (processor)901, a communication Interface (Communications Interface)902, a memory (memory)903, and a bus 904. The processor 901, the communication interface 902 and the memory 903 are in communication with each other via a bus 904.
The memory 903 may store logic instructions for determining the position of the receive coil of the magnetic resonance system, and may be, for example, a non-volatile memory (non-volatile memory). The processor 901 may invoke logic instructions in the execution memory 903 to determine the position of receive coils of the magnetic resonance system to perform the method of determining the position of receive coils of the magnetic resonance system described above. As an embodiment, the logic instructions for determining the position of the receiving coil of the magnetic resonance system may be a program corresponding to control software, and when the processor executes the instructions, the control device may correspondingly display a functional interface corresponding to the instructions on a display interface.
The functionality of the logic instructions for determining the position of the receiver coil of the magnetic resonance system can be stored in a computer-readable storage medium if it is implemented in the form of a software functional unit and sold or used as a separate product. Based on such understanding, the technical solutions of the present disclosure may be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the methods according to the embodiments of the present application. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.
The above logic instructions for determining the position of the receive coil of the magnetic resonance system may be referred to as "a device for determining the position of the receive coil of the magnetic resonance system", which may be divided into functional blocks. See in particular the following.
The following explains and explains an apparatus for determining a position of a receiving coil of a magnetic resonance system provided in an embodiment of the present application with reference to the drawings.
Referring to fig. 10, the schematic diagram of the structure of the apparatus for determining the position of the receiving coil of the magnetic resonance system according to the embodiment of the present application is shown.
The device for determining the position of the receiving coil of the magnetic resonance system provided by the embodiment of the application comprises a plurality of coil units, and the device comprises:
an acquisition unit 1001 configured to acquire echo signals of each channel during magnetic resonance scanning;
an actual coordinate obtaining unit 1002, configured to obtain an actual coordinate of each coil unit with respect to the center of the magnet according to the echo signal;
a form information obtaining unit 1003 for obtaining form information of the receiving coil from the actual coordinates of each coil unit and the theoretical coordinates in the original state;
a position obtaining unit 1004 for obtaining the position of the receiving coil according to the morphological information and the actual coordinates.
As an embodiment, in order to further improve the accuracy of magnetic resonance imaging, the actual coordinate obtaining unit 1002 specifically includes:
the reconstruction subunit is used for reconstructing a two-dimensional image corresponding to each coil unit according to the echo signals; the two-dimensional image includes positional information of the coil unit with respect to the center of the magnet;
and the actual coordinate obtaining subunit is used for obtaining the coordinate of the gravity center of the corresponding two-dimensional image relative to the center of the magnet according to the position information of the coil units, and taking the coordinate as the actual coordinate of each coil unit relative to the center of the magnet.
As an embodiment, in order to further improve the accuracy of magnetic resonance imaging, the morphological information obtaining unit 1003 specifically includes:
the theoretical value obtaining subunit is used for obtaining a theoretical value of a vector formed by connecting central points of any two coil units according to the theoretical coordinates;
a measured value obtaining subunit, configured to obtain a measured value of the vector according to the actual coordinate;
the rotation angle obtaining subunit is used for obtaining the rotation angles of any two coil units relative to the corresponding original states according to the theoretical values and the measured values;
a number obtaining subunit, configured to obtain the number of rotation angles falling within a preset angle range;
the determining subunit is used for determining that the receiving coil has a rotation angle theta relative to the original state when the number exceeds a preset number; otherwise, the receiving coil is determined to be in a folded state.
As an embodiment, in order to further improve the accuracy of magnetic resonance imaging, the position obtaining unit 1004 includes a position obtaining subunit;
and the position obtaining subunit is used for obtaining the position of the receiving coil according to the weight, the actual coordinate, the theoretical coordinate and the theta corresponding to each coil unit when the receiving coil has a rotation angle theta relative to the original state.
According to the device for determining the position of the receiving coil of the magnetic resonance system, the actual coordinate of each coil unit relative to the center of the magnet is obtained according to the echo signal collected by the receiving coil, the form information of the receiving coil is obtained according to the theoretical coordinate and the actual coordinate of each coil unit in the original state, and the position of the receiving coil is obtained according to the form information and the actual coordinate. Therefore, the device can obtain the position and the form information of the receiving coil according to the echo signal acquired by the receiving coil without manual participation, reduces the working difficulty of an MRI equipment operator, reduces the possibility of imaging error caused by personal error of the operator, and improves the accuracy of magnetic resonance imaging.
In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other manners. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application may be substantially implemented or contributed to by the prior art, or all or part of the technical solution may be embodied in a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a logistics management server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
The above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.
Claims (10)
1. A method of determining the position of a receive coil of a magnetic resonance system, the receive coil comprising a plurality of coil units, the method comprising:
collecting echo signals of each channel during magnetic resonance scanning;
obtaining actual coordinates of each coil unit relative to the center of the magnet according to the echo signals;
acquiring form information of the receiving coil according to the actual coordinates and theoretical coordinates of each coil unit in an original state;
and obtaining the position of the receiving coil according to the form information and the actual coordinate.
2. The method according to claim 1, wherein the obtaining actual coordinates of each of the coil units with respect to a center of a magnet from the echo signals comprises:
reconstructing a two-dimensional image corresponding to each coil unit according to the echo signals; the two-dimensional image includes positional information of the coil unit with respect to the center of the magnet;
and obtaining the coordinates of the gravity center of the corresponding two-dimensional image relative to the center of the magnet according to the position information of the coil units, and taking the coordinates as the actual coordinates of each coil unit relative to the center of the magnet.
3. The method according to claim 1, wherein the obtaining the morphological information of the receiving coil according to the actual coordinates and the theoretical coordinates of each coil unit in an original state specifically comprises:
obtaining a theoretical value of a vector formed by connecting central points of any two coil units according to the theoretical coordinates;
obtaining the measurement value of the vector according to the actual coordinate;
obtaining the rotation angles of any two coil units relative to the corresponding original states according to the theoretical values and the measured values;
obtaining the number of the rotation angles falling into a preset angle range;
when the number exceeds a preset number, determining that the receiving coil has a rotation angle theta relative to the original state; otherwise, the receiving coil is determined to be in a folded state.
4. The method according to claim 3, wherein the determining that the receiving coil has a rotation angle θ with respect to the original state specifically comprises:
and carrying out statistical analysis according to the preset angle range and the preset number to obtain the rotation angle theta of the receiving coil relative to the original state.
5. The method according to claim 3, wherein the obtaining the position of the receiving coil according to the morphological information and the actual coordinates comprises:
when the receiving coil is in a folded state, obtaining the position of the receiving coil according to the weight corresponding to each coil unit and the actual coordinate;
the weight corresponding to each coil unit is set according to the distance of each coil unit from the center of the magnet, wherein the weight corresponding to the coil unit which is farther away from the center of the magnet is smaller.
6. The method according to any one of claims 3 to 5, wherein the obtaining the position of the receiving coil from the morphology information and the actual coordinates comprises:
when the receiving coil has a rotation angle theta relative to the original state, obtaining the position of the receiving coil according to the weight corresponding to each coil unit, the actual coordinate, the theoretical coordinate and the theta;
the weight corresponding to each coil unit is set according to the distance of each coil unit from the center of the magnet, wherein the weight corresponding to the coil unit which is farther away from the center of the magnet is smaller.
7. An apparatus for determining the position of a receive coil of a magnetic resonance system, the receive coil comprising a plurality of coil units, the apparatus comprising:
the acquisition unit is used for acquiring echo signals of all channels during magnetic resonance scanning;
the actual coordinate obtaining unit is used for obtaining the actual coordinate of each coil unit relative to the center of the magnet according to the echo signal;
a form information obtaining unit for obtaining form information of the receiving coil according to the actual coordinates of each coil unit and theoretical coordinates in an original state;
and the position obtaining unit is used for obtaining the position of the receiving coil according to the form information and the actual coordinate.
8. The apparatus according to claim 7, wherein the actual coordinate obtaining unit specifically includes:
the reconstruction subunit is used for reconstructing a two-dimensional image corresponding to each coil unit according to the echo signals; the two-dimensional image includes positional information of the coil unit with respect to the center of the magnet;
and the actual coordinate obtaining subunit is used for obtaining the coordinate of the gravity center of the corresponding two-dimensional image relative to the center of the magnet according to the position information of the coil units, and taking the coordinate as the actual coordinate of each coil unit relative to the center of the magnet.
9. The apparatus according to claim 7, wherein the morphology information obtaining unit specifically includes:
the theoretical value obtaining subunit is used for obtaining a theoretical value of a vector formed by connecting central points of any two coil units according to the theoretical coordinates;
a measured value obtaining subunit, configured to obtain a measured value of the vector according to the actual coordinate;
the rotation angle obtaining subunit is used for obtaining the rotation angles of any two coil units relative to the corresponding original states according to the theoretical values and the measured values;
a number obtaining subunit, configured to obtain the number of the rotation angles falling within a preset angle range;
the determining subunit is used for determining that the receiving coil has a rotation angle theta relative to the original state when the number exceeds a preset number; otherwise, the receiving coil is determined to be in a folded state.
10. The apparatus of claim 9, wherein the location obtaining unit comprises a location obtaining subunit;
the position obtaining subunit is configured to, when the receiving coil has a rotation angle θ relative to an original state, obtain a position of the receiving coil according to the weight, the actual coordinate, the theoretical coordinate, and the θ corresponding to each coil unit;
the weight corresponding to each coil unit is set according to the distance of each coil unit from the center of the magnet, wherein the weight corresponding to the coil unit which is farther away from the center of the magnet is smaller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910403107.3A CN110007258B (en) | 2019-05-15 | 2019-05-15 | Method and device for determining position of receiving coil of magnetic resonance system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910403107.3A CN110007258B (en) | 2019-05-15 | 2019-05-15 | Method and device for determining position of receiving coil of magnetic resonance system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110007258A CN110007258A (en) | 2019-07-12 |
| CN110007258B true CN110007258B (en) | 2021-04-06 |
Family
ID=67177017
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910403107.3A Active CN110007258B (en) | 2019-05-15 | 2019-05-15 | Method and device for determining position of receiving coil of magnetic resonance system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110007258B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112924911B (en) * | 2021-01-25 | 2022-11-25 | 上海东软医疗科技有限公司 | Method and device for acquiring coil information in magnetic resonance system |
| CN112782618B (en) * | 2021-01-26 | 2021-11-23 | 中国科学院近代物理研究所 | Device and method for detecting magnetic field parameter calculation value of dipolar electromagnet |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1356774A1 (en) * | 2002-04-23 | 2003-10-29 | Ethicon Endo-Surgery | Method for using an MRI compatible biopsy device with detachable probe |
| CN101156777A (en) * | 2006-10-06 | 2008-04-09 | Ge医疗系统环球技术有限公司 | Apparatus and method for magnetic resonance imaging |
| CN101305908A (en) * | 2007-05-17 | 2008-11-19 | 西门子（中国）有限公司 | Signal-noise ratio computation method of parallelly collected image reconstruction |
| CN101533077A (en) * | 2009-04-17 | 2009-09-16 | 中国科学院电工研究所 | Optimal design method of superconducting magnet used for magnetic resonance imaging (MRI) device |
| CN105380649A (en) * | 2015-12-07 | 2016-03-09 | 沈阳东软医疗系统有限公司 | Radio frequency receiving coil positioning method and device in magnetic resonance imaging system |
| CN105476635A (en) * | 2015-12-29 | 2016-04-13 | 沈阳东软医疗系统有限公司 | Positioning method and device of radio frequency coil in nuclear magnetic resonance imaging system |
| CN108663640A (en) * | 2018-05-09 | 2018-10-16 | 上海东软医疗科技有限公司 | A kind of magnetic resonance coil method for determining position and device |
| CN108872909A (en) * | 2018-06-06 | 2018-11-23 | 上海东软医疗科技有限公司 | The gradient coil position calibration method and device of magnetic resonance system |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20190004122A1 (en) * | 2014-04-25 | 2019-01-03 | Purdue Research Foundation | Wireless position sensing using magnetic field of single transmitter |
-
2019
- 2019-05-15 CN CN201910403107.3A patent/CN110007258B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1356774A1 (en) * | 2002-04-23 | 2003-10-29 | Ethicon Endo-Surgery | Method for using an MRI compatible biopsy device with detachable probe |
| CN101156777A (en) * | 2006-10-06 | 2008-04-09 | Ge医疗系统环球技术有限公司 | Apparatus and method for magnetic resonance imaging |
| CN101305908A (en) * | 2007-05-17 | 2008-11-19 | 西门子（中国）有限公司 | Signal-noise ratio computation method of parallelly collected image reconstruction |
| CN101533077A (en) * | 2009-04-17 | 2009-09-16 | 中国科学院电工研究所 | Optimal design method of superconducting magnet used for magnetic resonance imaging (MRI) device |
| CN105380649A (en) * | 2015-12-07 | 2016-03-09 | 沈阳东软医疗系统有限公司 | Radio frequency receiving coil positioning method and device in magnetic resonance imaging system |
| CN105476635A (en) * | 2015-12-29 | 2016-04-13 | 沈阳东软医疗系统有限公司 | Positioning method and device of radio frequency coil in nuclear magnetic resonance imaging system |
| CN108663640A (en) * | 2018-05-09 | 2018-10-16 | 上海东软医疗科技有限公司 | A kind of magnetic resonance coil method for determining position and device |
| CN108872909A (en) * | 2018-06-06 | 2018-11-23 | 上海东软医疗科技有限公司 | The gradient coil position calibration method and device of magnetic resonance system |
Non-Patent Citations (1)
| Title |
|---|
| New Coil Positioning Method for Interleaved;Marius Moisa, MS et al.;《JOURNAL OF MAGNETIC RESONANCE IMAGING》;20091231;第189-197页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110007258A (en) | 2019-07-12 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP5931406B2 (en) | Magnetic resonance imaging system | |
| CN103800006B (en) | Motional error correction in functional magnetic resonance imaging | |
| US10444314B2 (en) | Magnetic resonance imaging apparatus and method for acquiring under-sampled MR signal | |
| KR101663229B1 (en) | Magnetic resonance imaging apparatus and imaging method for magnetic resonance image thereof | |
| JP2015510804A (en) | Reconstruction of magnetic resonance images using detection of respiratory motion during sampling in the middle and periphery of the K-space region | |
| CN110007258B (en) | Method and device for determining position of receiving coil of magnetic resonance system | |
| EP1118008A1 (en) | Determination of the 3d position and orientation of an internal mri receiving coil | |
| CN103901377B (en) | The plural number in the spaces Q- for being detected while relevant and incoherent movement is rebuild | |
| CN104395773A (en) | Through-plane navigator | |
| CN103908253A (en) | Method and apparatus for obtaining magnetic resonance image | |
| KR101811720B1 (en) | Magnetic resonance imaging apparatus and scanning method for magnetic resonance image thereof | |
| WO2023109064A1 (en) | Gradient sensitivity correction method and system | |
| US8160342B2 (en) | System and method for processing data signals | |
| KR20160132946A (en) | System and method for spiral volume imaging | |
| JP2018183448A (en) | Information processing device, information processing method, and program | |
| CN110095741A (en) | Magnetic resonance coil method for determining position, device and magnetic resonance imaging system | |
| US9833166B2 (en) | Magnetic resonance imaging apparatus configured to acquire target site diagnostic image data based on detection of target sites in prior acquired image data | |
| CN108601553A (en) | MR imaging apparatus and the method for scanning magnetic resonance image using the MR imaging apparatus | |
| JP2006158762A (en) | Mri apparatus | |
| JP2000287949A (en) | Nuclear magnetic resonance imaging apparatus | |
| KR101819908B1 (en) | Method and Apparatus for Processing MRI Images | |
| CN106030655B (en) | Articulated structure registration in the magnetic resonance image of brain | |
| CN113466768B (en) | Magnetic resonance imaging method and magnetic resonance imaging system | |
| CN111103562B (en) | Reconstruction method and device for simultaneously imaging multiple slice layers | |
| KR102092908B1 (en) | Magnetic Resonance Imaging Apparatus for Correcting Respiratory Movement |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |