K space data reconstruction method and device, equipment and medium

Abstract

The invention provides a K space data reconstruction method, system and device and a medium, and the method comprises the steps: setting the receiving gain of a K space phase coding line according to a control instruction received by a receiver of a magnetic resonance spectrometer after formal scanning is started; based on the conventional receiving gain and the high receiving gain, scanning the target object to obtain first K space data corresponding to the first part and second K space data corresponding to the second part; normalizing the amplitude of the first K-space data to a high receiving gain level to obtain the normalized first K-space data, and splicing the normalized first K-space data and the second K-space data to obtain complete K-space data; and performing inverse Fourier transform processing on the complete K space data to obtain image data of the target object. According to the invention, the receiving gain parameter can be dynamically adjusted during a single scanning period, and the scanning success rate and the image quality are improved.

Description

Technical Field

[0001] The present invention relates to the field of electronic information technology, and in particular to a K-space data reconstruction method, device, equipment and medium. Background Art

[0002] In magnetic resonance imaging, the received signal data is stored in the form of K space. The echo signal corresponding to the line with a smaller phase encoding gradient is stronger, while the echo signal corresponding to the line with a larger phase encoding gradient is weaker. The K space data can be reconstructed into two-dimensional or three-dimensional image information of the object through inverse Fourier transform. Different areas of the K space have different contributions to different characteristics of the image. Among them, the signal in the central area of ​​the K space mainly determines the image contrast and overall contour, while the signal in the edge area of ​​the K space mainly determines the details and resolution of the image.

[0003] At present, by setting different gain parameters for pre-scanning, the amplitude distribution of the echo signal in the K space under different gain settings is obtained. After the formal scan is started, the phase encoding line of the K space is divided into N parts, and a receiving gain is set for each part, so that the echo signal corresponding to the phase encoding line of the corresponding part can fully utilize the dynamic range of the ADC when it reaches the ADC for analog-to-digital conversion. However, the above-mentioned method for dynamically adjusting the signal amplitude of different regions of the K space within a single scan time still has some potential defects: a practical and feasible specific implementation plan is not given for the division ratio of the N parts of the K space; there are many groups of receiving gain settings, and each scan object is scanned once under each receiving gain control, which will extend the entire sequence scanning time (Time of Repetition), and the amplitude normalization process is more complicated. Therefore, an effective K space data reconstruction method is urgently needed to solve the above problems. Summary of the invention

[0004] In view of the above problems, the present invention is proposed to provide a K-space data reconstruction method, device, equipment and medium that overcome the above problems or at least partially solve the above problems.

[0005] To achieve the above-mentioned and other related purposes, the present invention provides a K-space data reconstruction method, which is applied to a magnetic resonance imaging system, and the method comprises:

[0006] After the formal scan is started, the receiving gain of the K-space phase encoding line is set according to the control instruction received by the receiver of the magnetic resonance imaging system; wherein the K-space phase encoding line is divided into a first part and a second part, the first part is set with a normal receiving gain, and the second part is set with a high receiving gain;

[0007] Scanning the target object based on the conventional receiving gain and the high receiving gain to obtain first K space data corresponding to the first part and second K space data corresponding to the second part;

[0008] Normalizing the amplitude of the first K space data to a high receiving gain level to obtain normalized first K space data, and splicing the normalized first K space data and the second K space data to obtain complete K space data;

[0009] Perform inverse Fourier transform processing on the complete K-space data to obtain image data of the target object.

[0010] Optionally, after the formal scan is started, the receiving gain of the K-space phase encoding line is set according to the control instruction received by the receiver of the magnetic resonance imaging system, including:

[0011] After the formal scan is started, it is determined whether the magnetic resonance imaging system is a two-dimensional pulse sequence scanning mode;

[0012] When it is determined that the magnetic resonance imaging system is in a two-dimensional pulse sequence scanning mode, the receiving gain of the K-space phase encoding line is set according to the control instruction received by the receiver.

[0013] Optionally, after the step of determining whether the magnetic resonance imaging system is a two-dimensional pulse sequence scanning system, the method further includes:

[0014] When it is determined that the magnetic resonance imaging system is in a three-dimensional pulse sequence scanning mode, the receiving gain of the K-space phase encoding line is set according to the control instruction received by the receiver.

[0015] Optionally, the magnetic resonance imaging system further includes a controller and a gradient subsystem, and setting the receiving gain of the K-space phase encoding line according to the control instruction received by the receiver of the magnetic resonance spectrometer includes:

[0016] Sending a control instruction to the receiver through a controller, and setting a receiving gain parameter of the receiver according to the control instruction; wherein the receiving gain parameter includes a normal receiving gain and a high receiving gain;

[0017] Sending a phase encoding line command to the gradient subsystem through the controller, and determining whether the phase encoding line command contains a preset identifier;

[0018] When it is detected that the phase encoding line command contains a preset identifier, the K-space phase encoding lines corresponding to the preset identifier are divided into a first part; and when it is detected that the phase encoding line command does not contain the preset identifier, the K-space phase encoding lines not corresponding to the preset identifier are divided into a second part;

[0019] The reception gain of the first part is set to a normal reception gain, and the reception gain of the second part is set to a high reception gain.

[0020] Optionally, scanning the target object based on the conventional receiving gain and the high receiving gain to obtain first K space data corresponding to the first part and second K space data corresponding to the second part includes:

[0021] Scanning a first portion of the target object according to a conventional receiving gain set for the first portion to obtain first K-space data corresponding to the first portion;

[0022] According to the high receiving gain set for the second part, the second part of the target object is scanned to obtain second K-space data corresponding to the second part.

[0023] Optionally, normalizing the amplitude of the first K-space data to a high receiving gain level to obtain the normalized first K-space data includes:

[0024] calculating a gain difference between the normal receiving gain and the high receiving gain;

[0025] The amplitude of the first K-space data is multiplied by the gain difference to obtain normalized first K-space data.

[0026] Optionally, the step of splicing the normalized first K space data and the second K space data to obtain complete K space data includes:

[0027] Filling the normalized first K space data to the complement of the second K space data relative to the complete K space to form the complete K space data; or

[0028] The second K space data is correspondingly filled into the complement of the normalized first K space data relative to the complete K space so as to be merged into the complete K space data.

[0029] In a second aspect, the present invention further provides a K-space data reconstruction device, which is applied to a magnetic resonance imaging system, and the device comprises:

[0030] A setting module, used for setting the receiving gain of the K-space phase encoding line according to the control instruction received by the receiver of the magnetic resonance imaging system after the formal scanning is started; wherein the K-space phase encoding line is divided into a first part and a second part, the first part is set with a conventional receiving gain, and the second part is set with a high receiving gain;

[0031] A scanning module, configured to scan the target object based on the conventional receiving gain and the high receiving gain, and obtain first K space data corresponding to the first part and second K space data corresponding to the second part;

[0032] a splicing module, used for normalizing the amplitude of the first K space data to a high receiving gain level to obtain normalized first K space data, and splicing the normalized first K space data and the second K space data to obtain complete K space data;

[0033] The processing module is used to perform inverse Fourier transform processing on the complete K-space data to obtain image data of the target object.

[0034] In a third aspect, the present invention provides an electronic device, comprising: a memory and a processor; the memory is used to store a computer program; the processor is used to execute the computer program stored in the memory, so that the electronic device performs the steps of the K-space data reconstruction method as described above.

[0035] In a fourth aspect, the present invention provides a computer-readable storage medium having a computer program stored thereon, which, when executed by an electronic device, implements the steps of the K-space data reconstruction method as described above.

[0036] The above one or more technical solutions provided by the present invention may have the following advantages or at least achieve the following technical effects:

[0037] As described above, the K-space data reconstruction method, device, equipment and medium of the present invention can dynamically adjust the receiving gain parameters during a single scan, thereby improving the scanning success rate and image quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 Shown is a flow chart of a method for reconstructing K-space data in one embodiment of the present invention;

[0039] Figure 2 Shown is a schematic diagram of a process of obtaining K-space data using different scanning methods in one embodiment of the present invention;

[0040] Figure 3 Shown is a schematic diagram of a process for setting a K-space phase encoding line receiving gain in one embodiment of the present invention;

[0041] Figure 4 Shown is a schematic diagram of the distribution process of K-space phase encoding lines in one embodiment of the present invention;

[0042] Figure 5 It is a schematic diagram showing the functional modules of a device for reconstructing K-space data in one embodiment of the present invention;

[0043] Figure 6 Shown is a schematic diagram of an electronic device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0044] The following describes the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.

[0045] It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present invention, and thus the drawings only show components related to the present invention rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0046] In the following description, numerous details are discussed to provide a more thorough explanation of the embodiments of the present invention. However, it is obvious to those skilled in the art that the embodiments of the present invention can be implemented without these specific details. In other embodiments, well-known structures and devices are shown in the form of block diagrams rather than in detail to avoid making the embodiments of the present invention difficult to understand.

[0047] The terms "first", "second", etc. in the specification and claims of the disclosed embodiments and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchanged where appropriate, so that the embodiments of the disclosed embodiments described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions.

[0048] Unless otherwise stated, the term "plurality" means two or more.

[0049] In the embodiment of the present disclosure, the character " / " indicates that the preceding and following objects are in an "or" relationship. For example, A / B indicates: A or B.

[0050] The term "and / or" is a description of the association relationship between objects, indicating that three relationships can exist. For example, A and / or B means: A or B, or, A and B.

[0051] The technical solutions in the embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0052] See also Figure 1 An embodiment of the present invention provides a K-space data reconstruction method, which is applied to a magnetic resonance imaging system. The magnetic resonance imaging system includes a controller and a receiver. The method may include the following steps S10 to S40:

[0053] Step S10, after the formal scan is started, the receiving gain of the K-space phase encoding line is set according to the control instruction received by the receiver of the magnetic resonance imaging system; wherein the K-space phase encoding line is divided into a first part and a second part, the first part is set with a conventional receiving gain, and the second part is set with a high receiving gain.

[0054] Among them, the magnetic resonance imaging system usually includes a controller and a receiver.

[0055] The controller is used to coordinate and control the entire imaging process. The controller can set imaging parameters such as magnetic field strength, pulse sequence, scanning time, etc. to ensure the accuracy and stability of the imaging process.

[0056] The receiver is used to receive magnetic resonance signals from the human body, amplify and process them so that the computer can perform subsequent image reconstruction.

[0057] The controller and receiver work together to ensure the accuracy, stability and efficiency of the magnetic resonance imaging process.

[0058] Control instructions can be instructions issued by the controller to control the receiver according to the requirements of the imaging sequence to adjust the working state of the receiver, such as setting the receiving gain, bandwidth, filter parameters, etc.; thereby ensuring that the receiver can accurately receive and process the magnetic resonance signals of human tissues and provide high-quality data for subsequent image reconstruction and analysis.

[0059] The K-space phase encoding line can be divided into the first part and the second part.

[0060] The first part can be represented by a preset number of phase encoding lines with the smallest K-space phase encoding gradient (for example, 20% of the phase encoding lines with the smallest phase encoding gradient can be set as the first part); it is used to acquire areas with higher signal-to-noise ratio requirements (such as the central area of ​​the image).

[0061] In this embodiment, the preset number needs to be adjusted according to specific imaging requirements, equipment performance and patient conditions.

[0062] The second part can be represented as the phase encoding lines in the K space except the first part; it is used to collect the area with higher requirements for high resolution (such as the edge area of ​​the image).

[0063] As an example, when the magnetic resonance imaging system is in a two-dimensional pulse sequence scanning (such as single-layer imaging of the head, chest, etc.), the 20% phase encoding lines with the smallest phase encoding gradient in the K space can be set as the first part, and the remaining 80% phase encoding lines can be set as the second part.

[0064] As another example, when the magnetic resonance imaging system is in a three-dimensional pulse sequence scanning (e.g., three-dimensional imaging of organs such as the brain and heart), the first and second 20% phase encoding lines with the smallest phase encoding gradients in the K space can be set as the first part, and the remaining 80% phase encoding lines can be set as the second part.

[0065] Conventional receiving gain can be a small amplification factor for the magnetic resonance signal. By reducing the receiving gain, the amplification of noise can be reduced, the noise in the image can be relatively low, and the image clarity and signal-to-noise ratio can be improved.

[0066] High receiving gain can greatly amplify the magnetic resonance signal, which can improve the contrast between specific tissues and surrounding tissues, making the target tissue easier to identify and analyze.

[0067] As an example, the high receive gain may be set to 80 db and the normal receive gain may be set to 60 db.

[0068] As another example, assuming that the receiving gain is expressed in multiples, for example, the high receiving gain can be set to 100 times, and the normal receiving gain can be set to 50 times, it can be converted into a logarithmic form (such as decibel) for calculation. The conversion formula is: Gain (db) = 20log10 (multiple).

[0069] Calculated by the conversion formula, the high receiving gain is 20×log10(100)=40db, and the normal receiving gain is 20log10(50)≈34db.

[0070] In a specific implementation, after the formal scan is started, the controller sends a control instruction to the receiver according to the imaging sequence requirements; after the receiver receives the control instruction, the K-space phase encoding line is divided into a first part and a second part according to the control instruction; and the receiving gain of the first part can be set to a normal receiving gain, and the receiving gain of the second part can be set to a high receiving gain.

[0071] Step S20: Scan the target object based on the conventional receiving gain and the high receiving gain to obtain first K space data corresponding to the first part and second K space data corresponding to the second part.

[0072] The first K-space data may be partial K-space data obtained after scanning the target object according to the conventional receiving gain set in the first part.

[0073] The second K-space data may be partial K-space data obtained after scanning the target object according to the high receiving gain set in the second part.

[0074] In a specific implementation, the target object is scanned according to the respective receiving gains set for the first part and the second part of the K-space phase encoding line, so that first K-space data corresponding to the first part and second K-space data corresponding to the second part can be obtained.

[0075] Step S30, normalizing the amplitude of the first K space data to a high receiving gain level to obtain normalized first K space data, and splicing the normalized first K space data and the second K space data to obtain complete K space data.

[0076] The normalized first K space data may be the K space data normalized to the same high receiving gain level, which generally refers to making the amplitude characteristics of the first K space data at a conventional receiving gain close to the amplitude characteristics of the second K space data at a high receiving gain to a certain extent.

[0077] The complete K-space data may be K-space data obtained by merging the normalized first K-space data and the second K-space data.

[0078] In a specific implementation, the positional relationship between the normalized first K space data and the second K space data in the K space can be determined first to determine the splicing boundary; and then the normalized first K space data and the second K space data can be synthesized into complete K space data according to the splicing boundary.

[0079] Step S40: Perform inverse Fourier transform processing on the complete K-space data to obtain image data of the target object.

[0080] The image data may be the complete K-space data processed by inverse Fourier transform to obtain the corresponding image data.

[0081] Fourier transform is a mathematical tool that converts signals from the time domain to the frequency domain. In magnetic resonance imaging, K-space data can be regarded as signals in the frequency domain, while image data is a signal in the time domain.

[0082] In the specific implementation, by performing inverse Fourier transform on the complete K-space data, the K-space data can be converted into image data to obtain the image data of the target object; by selecting reasonable Fourier transform methods and parameters, high-quality image data can be obtained; thus, strong support can be provided for medical diagnosis and scientific research.

[0083] As an example, for a two-dimensional magnetic resonance image, a two-dimensional inverse Fourier transform is usually used to convert the complete K-space data into image data. The two-dimensional inverse Fourier transform can convert a two-dimensional data matrix in the K-space into a two-dimensional pixel matrix in the image space.

[0084] As another example, for a three-dimensional magnetic resonance image, a three-dimensional inverse Fourier transform is required to convert the complete K-space data into image data. The three-dimensional inverse Fourier transform can convert a three-dimensional data matrix in the K-space into a three-dimensional pixel matrix in the image space.

[0085] For further information, please refer to Figure 2 In one embodiment, step S10 may include the following sub-steps A10 to A20:

[0086] Sub-step A10, after the formal scan is started, it is determined whether the magnetic resonance imaging system is in a two-dimensional pulse sequence scanning mode.

[0087] Among them, the magnetic resonance imaging system includes a two-dimensional pulse sequence scanning mode and a two-dimensional pulse sequence scanning mode.

[0088] Two-dimensional pulse sequence (2D) scanning refers to data acquisition in one plane to obtain two-dimensional images; two-dimensional images can clearly show the anatomical structure and lesions at a specific level. For example, axial, coronal and sagittal images of the brain are often used to diagnose brain diseases.

[0089] The two-dimensional pulse sequence (3D) scanning method refers to the data collection of the entire three-dimensional volume, which can obtain continuous three-dimensional images. For example, the three-dimensional volume imaging of the head can clearly show the structures of the skull, brain blood vessels, etc.

[0090] The two-dimensional pulse sequence scanning and three-dimensional pulse sequence scanning in the magnetic resonance imaging system each have their own characteristics and application scenarios. Doctors and technicians can choose the appropriate scanning method according to specific examination needs.

[0091] In a specific implementation, after the formal scanning is started, it is first determined whether the magnetic resonance imaging system is a two-dimensional pulse sequence scan; and then the K-space phase encoding lines can be divided according to different scanning modes.

[0092] Sub-step A20, when it is determined that the magnetic resonance imaging system is in a two-dimensional pulse sequence scanning mode, setting the receiving gain of the K-space phase encoding line according to the control instruction received by the receiver.

[0093] In a specific implementation, when it is determined that the magnetic resonance imaging system is a two-dimensional pulse sequence scanning mode, a preset number (e.g., 20%) of phase encoding lines with the smallest phase encoding gradient in the K space can be set as the first part, and the remaining 80% of the phase encoding lines can be set as the second part; and then, according to the control instructions received by the computer, a conventional receiving gain is set for the first part, and a high receiving gain is set for the second part.

[0094] For further information, please refer to Figure 2 In one embodiment, step S10 may further include the following sub-step A30:

[0095] Sub-step A30, when it is determined that the magnetic resonance imaging system is in a three-dimensional pulse sequence scanning mode, setting the receiving gain of the K-space phase encoding line according to the control instruction received by the receiver.

[0096] In a specific implementation, when it is determined that the magnetic resonance imaging system is a three-dimensional pulse sequence scanning mode, a preset number of phase encoding lines with the smallest phase encoding gradient in the K space (e.g., 20% of the first and second phase encoding gradients in the K space are the smallest) can be set as the first part, and the remaining 80% of the phase encoding lines can be set as the second part; and then, according to the control instructions received by the computer, a conventional receiving gain can be set for the first part, and a high receiving gain can be set for the second part. Thus, according to the characteristics and application scenarios of the two-dimensional pulse sequence scanning and the three-dimensional pulse sequence scanning in the magnetic resonance imaging system, a suitable scanning mode can be selected to achieve different imaging effects.

[0097] In this embodiment, after the formal scan is started, the receiving gain of the K-space phase encoding line is set according to the control instruction received by the receiver of the magnetic resonance imaging system; wherein the K-space phase encoding line is divided into a first part and a second part, the first part is set with a conventional receiving gain, and the second part is set with a high receiving gain; based on the conventional receiving gain and the high receiving gain, the target object is scanned to obtain the first K-space data corresponding to the first part and the second K-space data corresponding to the second part; the amplitude of the first K-space data is normalized to the high receiving gain level to obtain the normalized first K-space data, and the normalized first K-space data and the second K-space data are spliced ​​to obtain the complete K-space data; the complete K-space data is subjected to inverse Fourier transform processing to obtain the image data of the target object. Thus, the receiving gain parameter can be dynamically adjusted during a single scan, which can improve the scanning success rate and image quality.

[0098] Based on the above embodiments, a second embodiment of the method for reconstructing K-space data of the present invention is proposed. Figure 3 In this embodiment, step S10 may further include the following sub-steps S101 to S104:

[0099] Sub-step S101, sending a control instruction to the receiver through a controller, and setting a receiving gain parameter of the receiver according to the control instruction; wherein the receiving gain parameter includes a normal receiving gain and a high receiving gain.

[0100] The magnetic resonance imaging system may also include a gradient subsystem; the gradient subsystem may be used to generate a linearly varying magnetic field in space to achieve spatial encoding of magnetic resonance signals.

[0101] The receiving gain parameter may include normal receiving gain and high receiving gain.

[0102] As an example, the high receive gain may be set to 80 db and the normal receive gain may be set to 60 db.

[0103] In a specific implementation, after the formal scan is started, a (high or low receiving gain) control instruction is sent to the receiver through the controller; then, the required receiving gain parameters of the receiver can be determined according to the control instruction; wherein the receiving gain parameters include normal receiving gain and high receiving gain.

[0104] Sub-step S102: sending a phase encoding line command to the gradient subsystem through the controller, and determining whether the phase encoding line command contains a preset identifier.

[0105] The phase coding line command can determine the strength and direction of the phase coding gradient applied at different time points, thereby determining the position information of the signal in the phase coding direction. The acquisition parameters (such as receiving gain) are received in the TR segment where the phase coding line is located, and the receiving gain parameters (including receiving gain) are sent to the receiver through the controller.

[0106] The preset identifier may be a preset identifier for identifying different parts of the K-space phase encoding line.

[0107] As an example, see Figure 4 , Figure 4 The display is a schematic diagram of the distribution of K-space phase encoding lines; Figure 4 As shown, the K space can be divided into three regions (based on the phase encoding gradient and signal characteristics), which are represented by S 1,H , S 2,L , S 3,H ; Among them, S 1,H and S3,H is acquired under high receive gain setting (corresponding to the second part of the K-space phase encoding line), S 2,L S is obtained under the normal receiving gain setting (corresponding to the first part of the K-space phase encoding line). 1,H The corresponding phase encoding line number range is L 1,H To L p-1,H , S 3,H The corresponding phase encoding line number range is L q+1,H To L M,H , S 2,L The corresponding phase encoding line number range is L p,L To L q,L .

[0108] It should be noted that the row number does not represent the scanning sequence number, but only represents the sequence number of the echo amplitude filled into the K space according to the phase encoding gradient strength. The echo amplitude corresponding to row numbers 1 to p-1 and q+1 to M is smaller than the echo amplitude corresponding to row numbers p to q. M is the total number of phase encoding rows in the K space, q-p+1 is the total number of phase encoding rows obtained in the K space under the conventional receiving gain setting, of which q-p+1 accounts for 20% of M.

[0109] Among them, S 2,L The "L" in the code can be represented as a preset identifier, and "L" can represent the area (S 2,L ) is the first part of the K-space phase encoding line; and S 1,H , S 3,H There is no "L" mark in the 1,H and S 3,H These two regions constitute the second part of the K-space phase encoding line.

[0110] In a specific implementation, after determining the receiving gain of the receiver, a phase encoding line command can be sent to the gradient subsystem through the controller, and then it can be determined whether the phase encoding line command contains a preset identifier; the first part and the second part of the K-space phase encoding line can be identified by the preset identifier.

[0111] Sub-step S103, when it is detected that the phase encoding line command contains a preset identifier, the K-space phase encoding line corresponding to the preset identifier is divided into a first part; and when it is detected that the phase encoding line command does not contain the preset identifier, the K-space phase encoding line not corresponding to the preset identifier is divided into a second part.

[0112] In a specific implementation, when it is detected that the phase encoding line command contains a preset identifier, the K-space phase encoding line corresponding to the preset identifier can be determined as the first part; and when it is detected that the phase encoding line command does not contain the preset identifier, the K-space phase encoding line not containing the preset identifier can be determined as the second part. Thus, the first part and the second part of the K space can be identified according to the preset identifier.

[0113] Sub-step S104, setting the receiving gain of the first part to a normal receiving gain, and setting the receiving gain of the second part to a high receiving gain.

[0114] In a specific implementation, after the K space is divided into two parts, a normal receiving gain may be set for the first part, and a high receiving gain may be set for the second part.

[0115] In this embodiment, a control instruction is sent to the receiver by a controller, and the receiving gain parameters of the receiver are set according to the control instruction; wherein the receiving gain parameters include a normal receiving gain and a high receiving gain; a phase encoding line command is sent to the gradient subsystem by the controller, and it is determined whether the phase encoding line command contains a preset identifier; when it is detected that the phase encoding line command contains a preset identifier, the K space phase encoding line corresponding to the preset identifier is divided into a first part; and when it is detected that the phase encoding line command does not contain the preset identifier, the K space phase encoding line corresponding to the preset identifier is divided into a second part; the receiving gain of the first part is set to a normal receiving gain, and the receiving gain of the second part is set to a high receiving gain. Thus, by using different receiving gains for different parts of the K space, the signal-to-noise ratio and resolution can be better balanced under the premise of ensuring the overall image quality, so as to meet the different image quality requirements of different regions.

[0116] Based on the above embodiments, a third embodiment of the method for reconstructing K-space data of the present invention is proposed. In this embodiment, step S20 may include the following sub-steps S201 to S202:

[0117] Sub-step S201 : scanning a first part of a target object according to a conventional receiving gain set for the first part to obtain first K-space data corresponding to the first part.

[0118] In a specific implementation, the first part of the target object is scanned using a set conventional receiving gain; then the acquired echo signal of the first part can be filled into the K space to obtain the first K space data corresponding to the first part of the target object.

[0119] Sub-step S202: scanning a second part of the target object according to the high receiving gain set for the second part to obtain second K-space data corresponding to the second part.

[0120] In a specific implementation, the second part of the target object is scanned using a set high receiving gain, and then the acquired echo signal of the second part can be filled into the K space to obtain the second K space data corresponding to the second part of the target object.

[0121] In this embodiment, according to the conventional receiving gain set for the first part, the first part of the target object is scanned to obtain the first K space data corresponding to the first part; according to the high receiving gain set for the second part, the second part of the target object is scanned to obtain the second K space data corresponding to the second part. Thus, by setting different receiving gains for different parts of the target object and performing scanning, K space data with specific characteristics can be obtained.

[0122] Based on the above embodiments, a fourth embodiment of the method for reconstructing K-space data of the present invention is proposed. In this embodiment, step S30 may include the following sub-steps S301 to S302:

[0123] Sub-step S301, calculating the gain difference between the normal receiving gain and the high receiving gain.

[0124] The gain difference can be expressed as the difference between the high receiving gain and the normal receiving gain, which reflects the difference in signal amplification under different receiving gain settings. The gain difference can be expressed in multiples, decibels (db), or other units.

[0125] As an example, assuming that the high reception gain can be set to 80 db and the normal reception gain can be set to 60 db, the gain difference is 80-60=20 db.

[0126] As another example, assuming that the receiving gain is expressed in multiples, first convert it to decibels (convert it to logarithmic form (such as decibels) for calculation, the conversion formula is: gain (db) = 20log10 (multiples)), and then perform a subtraction operation.

[0127] For example, the high receiving gain can be set to 100 times, and the normal receiving gain can be set to 50 times; calculated by the conversion formula, the high receiving gain is 20×log10(100)=40db, and the normal receiving gain is 20log10(50)≈34db; the gain difference is 40-34=6db.

[0128] In a specific implementation, a pre-scanning process can be added before the formal scanning of the target object. Under the control of high receiving gain and conventional receiving gain, a row of echo data of the minimum row of the phase encoding row is collected, and the amplitude multiples of the two sets of data are calculated to obtain the amplitude multiples of the high receiving gain and the conventional receiving gain required for the subsequent amplitude normalization process; finally, the difference between the high receiving gain and the conventional receiving gain is calculated according to the amplitude gain multiple to obtain the gain difference.

[0129] It should be noted that during pre-scanning, the scan is performed once under the control of conventional receiving gain and high receiving gain, and the scanning time for each line of K space is TR (Time of Repetition). This process only increases the data acquisition time by two lines (i.e., 2 TR times). In the related art, the K space is set to N parts, and a receiving gain is set for each part; during pre-scanning, the target object is scanned once under each receiving gain control, and this process requires N lines of data acquisition time (i.e., N TR times). In comparison, the technical solution of the present invention can shorten the pre-scanning time; it can also switch the receiving gain between different partitions of the K space without increasing the scanning time.

[0130] Sub-step S302: multiplying the amplitude of the first K-space data by the gain difference to obtain normalized first K-space data.

[0131] In a specific implementation, after calculating the gain difference, the amplitude of the first K-space data can be multiplied by the gain difference to obtain the normalized first K-space data, so that the conventional receiving gain can be quickly normalized to the high receiving gain level, so that the data collected under different receiving gains can have better consistency.

[0132] In a specific implementation, the gain difference between the conventional receiving gain and the high receiving gain is calculated, and the amplitude of the first K-space data is multiplied by the gain difference to obtain the normalized first K-space data, thereby improving the consistency and analyzability of the magnetic resonance imaging data.

[0133] Based on the above embodiments, a fifth embodiment of the method for reconstructing K-space data of the present invention is proposed. In this embodiment, step S30 may include the following sub-steps S303 to S304:

[0134] Sub-step S303, filling the normalized first K space data into the complement of the second K space data relative to the complete K space to merge into the complete K space data; or.

[0135] In a specific implementation, the complete K space can be determined first, and then the second K space data is kept at a corresponding position in the complete K space with an unchanged amplitude, and then the normalized first K space data is filled into the area not covered by the second K space data in the complete K space, thereby obtaining the complete K space data.

[0136] Sub-step S303: Fill the second K space data into the complement of the normalized first K space data relative to the complete K space to obtain the complete K space data.

[0137] In a specific implementation, alternatively, the complete K space can be determined first, and then the normalized first K space data is kept at the corresponding position in the complete K space with the amplitude unchanged, and then the second K space data is filled into the area not covered by the normalized first K space data in the complete K space accordingly, thereby obtaining the complete K space data.

[0138] In this embodiment, the normalized first K space data is correspondingly filled into the complement of the second K space data relative to the complete K space data to be merged into the complete K space data; or the second K space data is correspondingly filled into the complement of the normalized first K space data relative to the complete K space data to obtain the complete K space data; thereby, by combining the respective advantages of conventional receiving gain and high receiving gain, the merged complete K space data can better reflect the specific characteristics of the target object and obtain high-quality image data.

[0139] Based on the same inventive concept, the sixth embodiment of the present invention also provides a K-space data reconstruction device corresponding to the K-space data reconstruction method of the previous embodiment. Since the principle of solving the problem by the device in the sixth embodiment of the present invention is similar to the K-space data reconstruction method of the previous embodiment of the present invention, the implementation of the device can refer to the implementation of the method, and the repeated parts will not be repeated. Figure 5 , the K-space data reconstruction device of the present invention may include:

[0140] The setting module 10 is used to set the receiving gain of the K-space phase encoding line according to the control instruction received by the receiver of the magnetic resonance imaging system after the formal scanning is started; wherein the K-space phase encoding line is divided into a first part and a second part, the first part is set with a normal receiving gain, and the second part is set with a high receiving gain;

[0141] A scanning module 20, configured to scan the target object based on the conventional receiving gain and the high receiving gain, and obtain first K space data corresponding to the first part and second K space data corresponding to the second part;

[0142] A splicing module 30, configured to normalize the amplitude of the first K space data to a high receiving gain level to obtain normalized first K space data, and splice the normalized first K space data and the second K space data to obtain complete K space data;

[0143] The processing module 40 is used to perform inverse Fourier transform processing on the complete K-space data to obtain image data of the target object.

[0144] In addition, the present invention also provides a computer-readable storage medium, on which a computer program is stored, and when the program is executed by a processor, the above-mentioned K-space data reconstruction device method is implemented.

[0145] Figure 6 is a schematic block diagram of an electronic device provided in an embodiment of the present application. Figure 6 As shown, the electronic device includes: at least one processor 401, a memory 402, at least one network interface 403 and a user interface 405. The various components in the electronic device are coupled together through a bus system 404. It can be understood that the bus system 404 is used to realize the connection and communication between these components. In addition to the data bus, the bus system 404 also includes a power bus, a control bus and a status signal bus. However, for the sake of clarity, Figure 6 In the specification, various buses are labeled as bus systems.

[0146] The user interface 405 may include a display, a keyboard, a mouse, a trackball, a click gun, keys, buttons, a touch pad or a touch screen.

[0147] It is understood that the memory 402 can be a volatile memory or a non-volatile memory, and can also include both volatile and non-volatile memories. Among them, the non-volatile memory can be a read-only memory (ROM), a programmable read-only memory (PROM), which is used as an external cache. By way of example but not limitation, many forms of RAM are available, such as static random access memory (SRAM), synchronous static random access memory (SSRAM). The memory described in the embodiments of the present invention is intended to include but is not limited to these and any other suitable categories of memory.

[0148] The memory 402 in the embodiment of the present invention is used to store various categories of data to support the operation of the electronic device 400. Examples of these data include: any executable program for operating on the electronic device 400, such as an operating system 4021 and an application 4022; the operating system 4021 includes various system programs, such as a framework layer, a core library layer, a driver layer, etc., for implementing various basic services and processing hardware-based tasks. The application 4022 may include various applications, such as a media player (Media Player), a browser (Browser), etc., for implementing various application services. The reconstruction method of the K-space data provided in the embodiment of the present invention may be included in the application 4022.

[0149] The method disclosed in the above embodiment of the present invention can be applied to the processor 401, or implemented by the processor 401. The processor 401 may be an integrated circuit chip with signal processing capabilities. In the implementation process, each step of the above method can be completed by the hardware integrated logic circuit in the processor 401 or the instruction in the form of software. The above processor 401 can be a general processor, a digital signal processor (DSP, Digital Signal Processor), or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components, etc. The processor 401 can implement or execute the methods, steps and logic block diagrams disclosed in the embodiment of the present invention. The general processor 401 can be a microprocessor or any conventional processor, etc. The steps of the reconstruction method of K-space data provided in combination with the embodiment of the present invention can be directly embodied as a hardware decoding processor to perform, or a combination of hardware and software modules in the decoding processor to perform. The software module can be located in a storage medium, which is located in a memory. The processor reads the information in the memory and completes the steps of the above method in combination with its hardware.

[0150] In an exemplary embodiment, the electronic device 400 may be implemented by one or more application specific integrated circuits (ASIC), DSP, programmable logic device (PLD), complex programmable logic device (CPLD) to execute the aforementioned method.

[0151] In summary, the present invention can dynamically adjust the receiving gain parameters during a single scan, thereby improving the scanning success rate and image quality.

[0152] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A method for reconstructing K-space data, characterized in that: Applied to a magnetic resonance imaging system, the method comprises: After the formal scan is started, the receiving gain of the K-space phase encoding line is set according to the control instruction received by the receiver of the magnetic resonance imaging system; wherein the K-space phase encoding line is divided into a first part and a second part, the first part is set with a normal receiving gain, and the second part is set with a high receiving gain; Scanning the target object based on the conventional receiving gain and the high receiving gain to obtain first K space data corresponding to the first part and second K space data corresponding to the second part; Normalizing the amplitude of the first K space data to a high receiving gain level to obtain normalized first K space data, and splicing the normalized first K space data and the second K space data to obtain complete K space data; Perform inverse Fourier transform processing on the complete K-space data to obtain image data of the target object.

2. The method according to claim 1, characterized in that After the formal scanning is started, the receiving gain of the K-space phase encoding line is set according to the control instruction received by the receiver of the magnetic resonance imaging system, including: After the formal scan is started, it is determined whether the magnetic resonance imaging system is a two-dimensional pulse sequence scanning mode; When it is determined that the magnetic resonance imaging system is in a two-dimensional pulse sequence scanning mode, the receiving gain of the K-space phase encoding line is set according to the control instruction received by the receiver.

3. The method according to claim 2, characterized in that After the step of determining whether the magnetic resonance imaging system is in a two-dimensional pulse sequence scanning mode, the method further includes: When it is determined that the magnetic resonance imaging system is in a three-dimensional pulse sequence scanning mode, the receiving gain of the K-space phase encoding line is set according to the control instruction received by the receiver.

4. The method according to claim 1, 2 or 3, characterized in that: The magnetic resonance imaging system further includes a controller and a gradient subsystem, wherein the receiving gain of the K-space phase encoding line is set according to the control instruction received by the receiver of the magnetic resonance spectrometer, including: Sending a control instruction to the receiver through a controller, and setting a receiving gain parameter of the receiver according to the control instruction; wherein the receiving gain parameter includes a normal receiving gain and a high receiving gain; Sending a phase encoding line command to the gradient subsystem through the controller, and determining whether the phase encoding line command contains a preset identifier; When it is detected that the phase encoding line command contains a preset identifier, the K-space phase encoding lines corresponding to the preset identifier are divided into a first part; and when it is detected that the phase encoding line command does not contain the preset identifier, the K-space phase encoding lines not corresponding to the preset identifier are divided into a second part; The reception gain of the first part is set to a normal reception gain, and the reception gain of the second part is set to a high reception gain.

5. The method according to claim 1, characterized in that The step of scanning the target object based on the conventional receiving gain and the high receiving gain to obtain first K space data corresponding to the first part and second K space data corresponding to the second part includes: Scanning a first portion of the target object according to a conventional receiving gain set for the first portion to obtain first K-space data corresponding to the first portion; According to the high receiving gain set for the second part, the second part of the target object is scanned to obtain second K-space data corresponding to the second part.

6. The method according to claim 1, characterized in that The step of normalizing the amplitude of the first K-space data to a high receiving gain level to obtain the normalized first K-space data includes: calculating a gain difference between the normal receiving gain and the high receiving gain; The amplitude of the first K-space data is multiplied by the gain difference to obtain normalized first K-space data.

7. The method according to claim 1, characterized in that The step of splicing the normalized first K space data and the second K space data to obtain complete K space data includes: Filling the normalized first K space data to the complement of the second K space data relative to the complete K space to form the complete K space data; or The second K space data is correspondingly filled into the complement of the normalized first K space data relative to the complete K space so as to be merged into the complete K space data.

8. A K-space data reconstruction device, characterized in that: Applied to a magnetic resonance imaging system, the device comprises: A setting module, used for setting the receiving gain of the K-space phase encoding line according to the control instruction received by the receiver of the magnetic resonance imaging system after the formal scanning is started; wherein the K-space phase encoding line is divided into a first part and a second part, the first part is set with a conventional receiving gain, and the second part is set with a high receiving gain; A scanning module, configured to scan the target object based on the conventional receiving gain and the high receiving gain, and obtain first K space data corresponding to the first part and second K space data corresponding to the second part; a splicing module, used for normalizing the amplitude of the first K space data to a high receiving gain level to obtain normalized first K space data, and splicing the normalized first K space data and the second K space data to obtain complete K space data; The processing module is used to perform inverse Fourier transform processing on the complete K-space data to obtain image data of the target object.

9. An electronic device, characterized in that: The electronic device comprises: a memory and a processor, wherein the memory is used to store a computer program, and the processor is used to execute the computer program stored in the memory, so that the electronic device performs the steps of the method as claimed in any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a program, and when the program is run, it is used to implement the steps of the method according to any one of claims 1 to 7.

Images