CN110488210B

CN110488210B - Scanning method for magnetic resonance system, computer device and storage medium

Info

Publication number: CN110488210B
Application number: CN201910653949.4A
Authority: CN
Inventors: 王超洪
Original assignee: Shanghai United Imaging Healthcare Co Ltd
Current assignee: Shanghai United Imaging Healthcare Co Ltd
Priority date: 2019-07-19
Filing date: 2019-07-19
Publication date: 2021-09-17
Anticipated expiration: 2039-07-19
Also published as: CN110488210A

Abstract

The present application relates to a scanning method, a computer device and a storage medium for a magnetic resonance system. The method comprises the following steps: acquiring a pulse sequence to be executed; respectively matching the pulse sequence to be executed with each historical pulse sequence stored in a memory to obtain the matching degree of the pulse sequence to be executed and each historical pulse sequence; according to the matching degree, determining a target pulse waveform of the pulse sequence to be executed from the pulse waveforms corresponding to the historical pulse sequence; and controlling the scanner to transmit a target pulse waveform to perform magnetic resonance scanning. The method can improve the working efficiency of scanning.

Description

Scanning method for magnetic resonance system, computer device and storage medium

Technical Field

The present application relates to the field of medical imaging technology, and in particular, to a scanning method, a computer device, and a storage medium for a magnetic resonance system.

Background

With the development of the field of medical image technology, Magnetic Resonance Imaging (MRI) technology, in particular magnetic resonance imaging sequence methods, has emerged. Magnetic resonance imaging is a relatively new technique compared to other imaging techniques, since it provides excellent soft tissue contrast.

A typical magnetic resonance imaging system comprises a magnet, a radio frequency system, a gradient system, a signal processor and an image reconstruction unit. The hydrogen nuclear spin in the human body can be equivalent to a small magnetic needle. In the strong magnetic field provided by the magnet, the disordered thermal equilibrium state of the hydrogen atomic nucleus is converted into partial instantaneous and partial inverse main magnetic field directions, and the difference between the partial instantaneous and partial inverse main magnetic field directions forms a net magnetization vector. When the hydrogen nuclei precess around the main magnetic field, the precession frequency is proportional to the magnetic field strength. The gradient coils in the gradient system generate magnetic fields with the strength changing with the space position, and the magnetic fields are used for controlling and encoding signals. A radio frequency transmitting coil in a radio frequency system turns a hydrogen atomic nucleus to a transverse plane from the direction of a main magnetic field and precesses around the main magnetic field, a radio frequency receiving coil in the radio frequency system induces an electric current signal and is acquired by an acquisition system, and the acquired signal is processed by a signal processor and an image reconstruction unit to obtain an image of the imaged tissue. That is, the magnetic resonance imaging system realizes imaging by controlling the hardware system to work orderly in time sequence, and such a computer program for controlling the hardware system to work orderly is generally called as a pulse sequence or a sequence for short. Wherein the pulse sequence includes a design of a radio frequency transmit pulse waveform. At the field intensity of 3T and below, because the radio frequency magnetic field B1 is relatively uniform, the common radio frequency transmission pulse uses the same radio frequency transmission pulse waveform for at most two channels, and the radio frequency transmission pulse waveforms of the two channels are only adjusted in amplitude and phase.

However, in ultra high field systems (greater than 3T), to obtain uniform B1 field distribution, multi-channel parallel transmission is typically employed, typically with N (N is 8 or greater) radio frequency transmit coils. In order to more flexibly configure the rf transmit pulses, conventionally, each rf channel is designed to be independent from another, and the amplitude and phase of each rf channel can be independently controlled, so that there are N different rf transmit pulses input. Also, to shorten the rf transmit pulse time, multi-channel transmission is also used to optimize the design of the multi-dimensional excitation rf transmit pulses. The multi-dimensional excitation radio frequency emission pulse needs to calculate the waveform of the radio frequency pulse according to the track of the excitation K space and the shape of the excitation area determined by the preset gradient waveform, and the whole calculation process is time-consuming, so that the working efficiency of scanning is low.

Disclosure of Invention

In view of the above, it is necessary to provide a scanning method, a computer device and a storage medium of a magnetic resonance system capable of improving the work efficiency.

A method of scanning of a magnetic resonance system, the method comprising:

acquiring a pulse sequence to be executed;

matching the pulse sequence to be executed with each historical pulse sequence stored in a memory respectively to obtain the matching degree of the pulse sequence to be executed and each historical pulse sequence;

according to the matching degree, determining a target pulse waveform of the pulse sequence to be executed from pulse waveforms corresponding to the historical pulse sequence;

and controlling a scanner to transmit the target pulse waveform to perform magnetic resonance scanning.

In one embodiment, the matching the pulse sequence to be executed with each historical pulse sequence stored in a memory to obtain a matching degree between the pulse sequence to be executed and each historical pulse sequence includes:

acquiring first characterization data of a first pulse waveform corresponding to the pulse sequence to be executed and acquiring second characterization data of a pulse waveform corresponding to each historical pulse sequence;

and respectively matching the first characterization data with each second characterization data, wherein the obtained matching degree is the matching degree of the pulse sequence to be executed and each historical pulse sequence.

In one embodiment, the determining, according to the matching degree, a target pulse waveform of the pulse sequence to be executed from pulse waveforms corresponding to the historical pulse sequence includes:

when the historical pulse sequence matched with the pulse sequence to be executed is determined to exist according to the matching degree, acquiring the historical pulse sequence with the highest matching degree with the pulse sequence to be executed;

and determining a target pulse waveform of the pulse sequence to be executed based on the first pulse waveform corresponding to the pulse sequence to be executed and the second pulse waveform corresponding to the historical pulse sequence with the highest matching degree.

In one embodiment, the determining a target pulse waveform of the pulse sequence to be executed based on a first pulse waveform corresponding to the pulse sequence to be executed and a second pulse waveform corresponding to the historical pulse sequence with the highest matching degree includes:

when the pulse sequence to be executed is not completely matched with the historical pulse sequence with the highest matching degree, acquiring a difference parameter of the first pulse waveform and the second pulse waveform;

adjusting the second pulse waveform according to the difference parameter, wherein the obtained waveform is a target pulse waveform of the pulse sequence to be executed;

and when the pulse sequence to be executed is completely matched with the historical pulse sequence with the highest matching degree, determining the second pulse waveform as the target pulse waveform of the pulse sequence to be executed.

In one embodiment, the method further comprises:

and when determining that the historical pulse sequence matched with the pulse sequence to be executed does not exist according to the matching degree, determining a first pulse waveform corresponding to the pulse sequence to be executed as a target pulse waveform of the pulse sequence to be executed.

In one embodiment, when it is determined that there is the historical pulse sequence matching the pulse sequence to be executed according to the matching degree, before acquiring the historical pulse sequence with the highest matching degree with the pulse sequence to be executed, the method includes:

comparing the matching degree with a preset matching degree;

if the matching degree is greater than or equal to a preset matching degree, determining that the historical pulse sequence matched with the pulse sequence to be executed exists;

and if the matching degree is smaller than the preset matching degree, determining that the historical pulse sequence matched with the pulse sequence to be executed does not exist.

In one embodiment, the target pulse waveform comprises at least one gradient target pulse waveform;

the control scanner transmits the target pulse waveform to perform magnetic resonance scanning, and comprises:

controlling the scanner to start a gradient emission channel corresponding to the gradient target pulse waveform type, wherein the gradient emission channel comprises at least one of an X-axis gradient emission channel, a Y-axis gradient emission channel and a Z-axis gradient emission channel;

transmitting each gradient target pulse waveform by using the gradient transmitting channel;

in one embodiment, the target pulse waveform comprises at least one radio frequency target pulse waveform;

adjusting the frequency of the radio frequency target pulse waveform;

controlling the scanner to start radio frequency emission channels with the number corresponding to the radio frequency target pulse waveform;

and simultaneously transmitting the radio frequency target pulse waveform after the frequency adjustment by using the radio frequency transmitting channel.

In one embodiment, after determining the target pulse waveform of the pulse sequence to be executed, the method further includes:

and storing the pulse sequence to be executed and the target pulse waveform of the pulse sequence to be executed into a memory.

A computer arrangement comprising a memory and a processor, the memory storing a computer program, characterized in that the processor, when executing the computer program, carries out the steps of the method of scanning of a magnetic resonance system according to any one of the preceding claims.

A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the scanning method of the magnetic resonance system of any one of the preceding claims.

According to the scanning method, the computer equipment and the storage medium of the magnetic resonance system, firstly, the pulse sequence to be executed is obtained, the pulse sequence to be executed is matched with each historical pulse sequence stored in the memory respectively, and the matching degree of the pulse sequence to be executed and each historical pulse sequence is obtained, so that the pulse sequence to be executed can be matched with the stored pulse sequence. And then, determining a target pulse waveform of the pulse sequence to be executed from the pulse waveforms corresponding to the historical pulse sequence according to the matching degree, and controlling a scanner to transmit the target pulse waveform to perform magnetic resonance scanning, so that the waveform can be obtained without calculation, and the scanning working efficiency is improved.

Drawings

Figure 1 is a flow diagram of a scanning method of a magnetic resonance system in one embodiment;

FIG. 2 is a schematic flow chart illustrating the steps of matching the pulse sequence to be executed with each historical pulse sequence stored in the memory to obtain the matching degree between the pulse sequence to be executed and each historical pulse sequence in one embodiment;

FIG. 3 is a flowchart illustrating a step of determining a target pulse waveform of a pulse sequence to be executed from pulse waveforms corresponding to historical pulse sequences according to a matching degree in an embodiment;

FIG. 4 is a schematic flow chart illustrating the steps of controlling a scanner to transmit a target pulse waveform for magnetic resonance scanning according to an embodiment;

FIG. 5 is a block diagram of an embodiment of a magnetic resonance scan processing apparatus;

FIG. 6 is a diagram illustrating an internal structure of a computer device according to an embodiment.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. For convenience of explanation, in the embodiments of the present application, a magnetic resonance system is used as an application target, and the technical solution of the present application is explained. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.

In one embodiment, as shown in fig. 1, a scanning method of a magnetic resonance system is provided, the magnetic resonance system includes a processor, a memory and a scanner, and the method is described as an example of the processor applied in the magnetic resonance system, and includes the following steps:

step S102, acquiring a pulse sequence to be executed.

The pulse sequence, which may also be referred to as a scan sequence, refers to the combination and timing relationships of a set of periodically repeated radio frequency pulses required to generate and measure magnetic resonance signals. For example, the pulse sequence may be an arrangement of related parameters such as radio frequency pulse, gradient field, and signal acquisition time, which are set in a time sequence, and the parameters related to the radio frequency pulse may include bandwidth (frequency band range), amplitude, application time, duration, and the like; the parameters of the gradient field may include the direction of application of the gradient field, the gradient field strength, the gradient time instant, the size time, etc. The pulse sequence to be executed is the pulse sequence which needs to be executed currently. Specifically, after receiving the scan command, the magnetic resonance system obtains a pulse sequence corresponding to the scan command, that is, a pulse sequence to be executed. The pulse sequence to be executed in the present application may comprise five parts, namely a radio frequency pulse, a slice selection gradient field, a phase encoding gradient field, a frequency encoding gradient field and an MR signal acquisition window. In addition, the kind of the pulse sequence to be executed is not particularly limited in the embodiment of the present application, and may be one or a combination of plural kinds of Free Induction Decay (FID) type sequence, Spin Echo type (Fast Spin Echo) sequence, gradient-Echo sequence (GRE) type sequence, hybrid sequence, and the like.

And step S104, respectively matching the pulse sequence to be executed with each historical pulse sequence stored in the memory to obtain the matching degree of the pulse sequence to be executed and each historical pulse sequence.

The historical pulse sequence refers to a pulse sequence that has been executed before the current scanning. It should be understood that the historical pulse sequence refers to a pulse sequence that has been used for over-scanning, or a pulse sequence that has been stored in a database and has a known scanning effect, or a known pulse sequence that has been obtained through a large number of analog operations, that is, the pulse parameters and the pulse waveforms of the historical pulse sequence are known values or a priori values. In this embodiment, after the pulse waveform corresponding to the pulse sequence is scanned, the pulse sequence and the corresponding pulse waveform are stored in the memory for matching with the subsequent pulse sequence.

Specifically, after acquiring the current pulse sequence to be executed, the history pulse sequence stored in the memory is acquired. And matching the current pulse sequence to be executed with the acquired historical pulse sequence to obtain a corresponding matching degree. The matching degree is a numerical value used for representing the matching degree of the pulse sequence to be executed and the historical pulse sequence, and the similarity degree of the pulse sequence to be executed and the historical pulse sequence can be determined through the matching degree.

And step S106, determining a target pulse waveform of the pulse sequence to be executed from the pulse waveforms corresponding to the historical pulse sequence according to the matching degree.

Specifically, when the historical pulse sequence matched with the pulse sequence to be executed is determined from the historical pulse sequences according to the matching degree, the historical pulse sequence matched with the pulse sequence to be executed is obtained. And taking the pulse waveform corresponding to the matched historical pulse sequence as the pulse waveform of the pulse sequence to be executed, namely the target pulse waveform of the pulse sequence to be executed.

And step S108, controlling the scanner to transmit the target pulse waveform to perform magnetic resonance scanning.

Scanners in magnetic resonance systems include, among other things, various coils such as RF transmit coils, RF receive coils, and the like, as well as gradient coils and the like. By driving the coils of the scanner, the magnetic resonance signal can be received or the corresponding pulse can be transmitted, that is, after the target pulse waveform is generated, the RF (Radio Frequency) coil and the gradient coil in the scanner can be controlled to execute the corresponding target pulse waveform.

In one embodiment, the target pulse waveform comprises at least one gradient target pulse waveform, which may be understood as comprising one or more gradient target pulse waveforms, and correspondingly, controlling the scanner to transmit said target pulse waveform for magnetic resonance scanning comprises: controlling the scanner to start a gradient transmitting channel corresponding to the gradient target pulse waveform type, wherein the gradient transmitting channel can comprise an X-axis gradient transmitting channel (corresponding to an X-axis gradient coil), a Y-axis gradient transmitting channel (corresponding to a Y-axis gradient coil), a Z-axis gradient transmitting channel (corresponding to a Z-axis gradient coil) and the like; and transmitting the gradient target pulse waveform by using the gradient transmitting channel. In this embodiment, the three gradient transmitting channels may transmit gradient target pulse waveforms simultaneously to perform first-order shimming, second-order shimming, or higher-order shimming, so as to obtain a uniform gradient field.

In one embodiment, the target pulse waveform comprises at least one radio frequency target pulse waveform, and may be understood to comprise one or more radio frequency target pulse waveforms, and accordingly, controlling the scanner to transmit the target pulse waveform for a magnetic resonance scan comprises: the frequency of the radio frequency target pulse waveform is adjusted, and for a high-field or ultrahigh-field magnetic resonance system transmitted by multiple channels, a plurality of radio frequency target pulse waveforms are provided, and the frequency of the plurality of radio frequency target pulse waveforms can be adjusted simultaneously; and controlling the scanner to simultaneously start a plurality of radio frequency transmitting channels corresponding to the radio frequency target pulse waveform, and simultaneously transmitting the radio frequency target pulse waveform after frequency adjustment by using the plurality of radio frequency transmitting channels.

Optionally, the target pulse waveform may also include a gradient target pulse waveform and a radio frequency target pulse waveform, and after the target pulse waveform is obtained, the scanner may be controlled to start a gradient transmitting channel and a radio frequency transmitting channel corresponding to the type of the target pulse waveform, and transmit the corresponding target pulse waveform simultaneously by using each transmitting channel.

Specifically, after the target pulse waveform is determined to be the radio frequency target pulse waveform, the frequency of the target pulse waveform is adjusted, the scanner is controlled to apply the target pulse waveform after the frequency adjustment to a corresponding coil channel, and the coil is driven to emit the target pulse waveform to perform scanning operation. For example, if the waveform of the target pulse waveform is an RF waveform, the carrier frequency of the RF pulse may be adjusted, the target pulse waveform with the adjusted carrier frequency may be applied to a corresponding RF transmission coil, and the RF transmission coil may be driven to transmit an RF signal to scan the scanned object. The frequency adjustment is understood to mean that the frequency of the target pulses is adjusted to the resonance frequency of the magnetic resonance system, for example, the central resonance frequency of a 1.5T magnetic resonance system with a main magnetic field is about 64MHz, and the central resonance frequency of a 3.0T magnetic resonance system with a main magnetic field is about 128 MHz. Since only the corresponding hydrogen atoms can be excited in accordance with the frequency of the magnetic resonance system and thus receive a fed back magnetic resonance signal.

The scanning method of the magnetic resonance system comprises the steps of firstly obtaining a pulse sequence to be executed, respectively matching the pulse sequence to be executed with each historical pulse sequence stored in a memory, and obtaining the matching degree of the pulse sequence to be executed and each historical pulse sequence, so as to ensure that the pulse sequence to be executed can be matched with the stored pulse sequence. And then, determining a target pulse waveform of the pulse sequence to be executed from the pulse waveforms corresponding to the historical pulse sequence according to the matching degree, and controlling a scanner to transmit the target pulse waveform to perform magnetic resonance scanning, so that the waveform can be obtained without calculation, and the scanning working efficiency is improved.

In one embodiment, as shown in fig. 2, step S104, matching the pulse sequence to be executed with each historical pulse sequence stored in the memory, respectively, to obtain a matching degree between the pulse sequence to be executed and each historical pulse sequence, includes the following steps:

step S202, first characterization data of a first pulse waveform corresponding to the pulse sequence to be executed is obtained, and second characterization data of the pulse waveform corresponding to each historical pulse sequence is obtained.

And step S204, respectively matching the first characterization data with each second characterization data, wherein the obtained matching degree is the matching degree of the pulse sequence to be executed and each historical pulse sequence.

Each pulse sequence has a corresponding pulse waveform, and the pulse waveform includes waveform content and waveform representation data, where the waveform content refers to a waveform of the pulse waveform itself, and the waveform representation data refers to data for representing the pulse waveform, for example, the waveform representation data of the radio frequency pulse waveform may be parameters related to the radio frequency pulse, including bandwidth (frequency band range), amplitude, application time, duration, and the like; the waveform characterization data of the gradient pulse waveform can be parameters of the gradient field, including the application direction of the gradient field, the field strength of the gradient field, the time moment of the gradient, the size time and the like. When the waveform of the pulse waveform is not available, the pulse waveform can be represented by waveform representation data. The first pulse waveform refers to a pulse waveform corresponding to a pulse sequence to be executed, and the second pulse waveform refers to a pulse waveform corresponding to a historical pulse sequence. The first characterization data is waveform characterization data of a first pulse waveform corresponding to the pulse sequence to be executed, and is used for representing data of the first pulse waveform. The second characterization data is waveform characterization data of a second pulse waveform corresponding to the historical pulse sequence, and is used for representing data of the second pulse waveform.

Specifically, when the pulse sequence to be executed is matched with the historical pulse sequence, first characterization data of a first pulse waveform corresponding to the pulse sequence to be executed is acquired, and second characterization data of the pulse waveform corresponding to each historical pulse sequence is acquired. And respectively matching the first characterization data with each second characterization data to respectively obtain the matching degree of the first characterization data and each second characterization data, wherein the matching degree of the first characterization data and the second characterization data is the matching degree of the pulse sequence to be executed and the historical pulse sequence. For example, if the history pulse train includes 3 history pulse trains, the history pulse train 1, the history pulse train 2, and the history pulse train 3 are respectively included. The second characterization data corresponding to the 3 historical pulse sequences are second characterization data 1, second characterization data 2 and second characterization data 3. And then, matching the first characterization data of the pulse sequence to be executed with the second characterization data 1, the second characterization data 2 and the second characterization data 3 respectively to obtain a matching degree 1, a matching degree 2 and a matching degree 3. The matching of the first characterization data and the second characterization data refers to comparing the similarity of the two data, and obtaining the corresponding matching degree according to the similarity. In this embodiment, since the pulse waveform is usually set as an analog wave, the data size of the waveform content itself is large, and if the pulse waveforms of the pulse sequence to be executed are directly matched, the first pulse waveform corresponding to the pulse sequence needs to be obtained and calculated, which results in a large amount of resources and time. And by directly acquiring the characterization data of the pulse waveform for comparison, the consumption of resources is reduced and the speed is increased.

In the present embodiment, the waveform matching using the characterization data is particularly suitable for the case of multi-rf channel transmission. Because each radio frequency channel corresponds to a pulse sequence, the pulse sequences of different radio frequency channels are different in amplitude, phase and the like of radio frequency parameters. In the actual scanning process, the first characterization data can be further divided into a common parameter and a difference parameter according to the common parameter and the difference parameter of different radio frequency channels, and the common parameter can be matched with the second characterization data of the pulse waveform corresponding to each historical pulse sequence only once; and matching the difference parameters with the second characterization data of the pulse waveform corresponding to each historical pulse sequence. For example, if the common parameter of the plurality of different rf channels is phase, the difference parameter is amplitude. It is understood that the plurality of different radio frequency channels are the same phase and different amplitudes. When matching is performed, the phase in the first characterization data of the pulse sequence to be executed is taken as a common parameter, and only the phase needs to be matched with the phase of the second characterization data of any one of the historical pulse sequences, and the result obtained by matching can represent the matching condition of the phase of the second characterization data in any one of the historical pulse sequences. If the amplitudes are different values, the amplitudes in the first characterizing data need to be matched with the amplitudes of the second characterizing data in each historical pulse sequence, that is, the number of the historical pulse sequences needs to be matched several times. And finally, after the two types of parameters are matched, fusing the matching results, namely determining the matching condition of the sequence to be executed and each historical pulse sequence by combining the matching results of the two types of parameters. Therefore, the operation amount is further reduced, and the requirement for real-time execution of the sequence under the high-field condition can be met.

In the embodiment, the pulse sequence can be input and designated by an operator and then sent by a controller of the magnetic resonance system, the pulse waveform corresponding to the historical pulse sequence is stored by the spectrometer system, and the pulse sequence is transmitted to the spectrometer system by replacing each characterization data, so that high bandwidth when a large amount of analog data is transmitted simultaneously is saved; meanwhile, the characterization data matching replaces the conventional analog waveform matching, the speed of a spectrometer system for producing a scanning sequence is increased, and the scanning response real-time performance is high.

In one embodiment, as shown in fig. 3, determining a target pulse waveform of a pulse sequence to be executed from pulse waveforms corresponding to historical pulse sequences according to the matching degree includes the following steps:

step S302, when determining that the historical pulse sequence matched with the pulse sequence to be executed exists according to the matching degree, acquiring the historical pulse sequence with the highest matching degree with the pulse sequence to be executed.

Step S304, a target pulse waveform of the pulse sequence to be executed is determined based on a first pulse waveform corresponding to the pulse sequence to be executed and a second pulse waveform corresponding to the history pulse sequence with the highest matching degree.

Specifically, the matching degree is compared with a preset matching, thereby determining whether there is a history pulse sequence matching the pulse sequence to be performed. And if the historical pulse sequence matched with the pulse sequence to be executed exists according to the matching degree, acquiring the historical pulse sequence with the highest matching degree with the pulse sequence to be executed as the historical pulse sequence obtained by matching. And acquiring a second pulse waveform of the historical pulse sequence with the highest matching degree with the pulse sequence to be executed, and acquiring a first pulse waveform of the pulse sequence to be executed. And determining a target pulse waveform of the pulse sequence to be executed according to the first pulse waveform of the pulse sequence to be executed and the second pulse waveform of the historical pulse sequence with the highest matching degree with the pulse sequence to be executed. Namely, if the historical pulse sequence with the highest matching degree is not completely matched with the pulse sequence to be executed, the second pulse waveform of the historical pulse sequence with the highest matching degree is adjusted according to the first pulse waveform of the pulse sequence to be executed, and the adjusted second pulse waveform is the obtained target pulse waveform. And on the contrary, if the historical pulse sequence with the highest matching degree is completely matched with the pulse sequence to be executed, directly taking the second pulse waveform of the historical pulse sequence with the highest matching degree as the target pulse waveform.

In one embodiment, before step S302, the method further includes: comparing the matching degree with a preset matching degree; if the matching degree is greater than or equal to the preset matching degree, determining that a historical pulse sequence matched with the pulse sequence to be executed exists; and if the matching degree is smaller than the preset matching degree, determining that no historical pulse sequence matched with the pulse sequence to be executed exists. For example, the preset matching degree is 80 percent, and when the matching degree is greater than or equal to 80, it is determined that there is a historical pulse sequence matched with the pulse sequence to be executed. Otherwise, if the matching degree which is more than or equal to 80 does not exist, determining that the historical pulse sequence matched with the pulse sequence to be executed does not exist.

Specifically, when the matching degree is compared with the preset matching degree and it is determined that the matching degree is greater than or equal to the preset matching degree, it indicates that there is a historical pulse sequence matching the pulse sequence to be executed, that is, step S302 is executed. And if the matching degree is smaller than the preset matching degree according to the comparison between the matching degree and the preset matching degree, determining that no historical pulse sequence matched with the pulse sequence to be executed exists. The first pulse waveform corresponding to the pulse sequence to be executed is determined as the target pulse waveform of the pulse sequence to be executed. That is to say, when the pulse sequence to be executed is matched with the historical pulse sequence to obtain a matching degree, and the matching degree is compared with the preset matching degree, so that it is determined that there is no historical pulse sequence matched with the pulse sequence to be executed, it indicates that the second pulse waveform corresponding to the historical pulse sequence cannot be used as the target pulse sequence of the pulse sequence to be executed, that is, the first pulse waveform corresponding to the pulse sequence to be executed is directly obtained as the target pulse waveform. Although acquiring the first pulse waveform corresponding to the to-be-executed pulse sequence consumes a lot of resources and time, if the first pulse waveform corresponding to the to-be-executed pulse sequence is not acquired after the target pulse is not matched, the first pulse waveform is in a state without the pulse waveform, thereby causing scan interruption. If the second pulse waveform with a matching degree not meeting the requirement is selected, the scanning quality is affected. That is, in this embodiment, after it is determined that there is no matching historical pulse sequence, the first pulse waveform of the pulse sequence to be executed is immediately acquired as the target pulse waveform to perform the scanning operation, so that it is ensured that the magnetic resonance scanning is not interrupted due to the fact that the historical pulse waveform is not matched, and the scanning operation is performed smoothly.

Further, if there are a plurality of matching degrees with the same value among the matching degrees obtained by matching with each of the history pulse sequences. The final matching result is determined according to the priority of each historical pulse sequence. The priority of each historical pulse sequence may be understood as being preset. Specifically, when the first characterization data of the pulse sequence to be executed is matched with the second characterization data 1 of the historical pulse sequence 1 and the second characterization data 2 of the historical pulse sequence 2, the obtained matching degrees are both 90 and are both greater than or equal to the preset matching degree 80. The priority of the historical pulse sequence 1 corresponding to the second characterization data 1 and the priority of the historical pulse sequence 2 corresponding to the second characterization data 2 are obtained. And determining the finally matched historical pulse sequence according to the priorities of the historical pulse sequence 1 and the historical pulse sequence 2. That is, if the priority of the history pulse train 2 is higher than that of the history pulse train 1, the history pulse train 2 is determined as the history pulse train with the highest matching degree of the pulse trains to be executed. In the embodiment, when the matching degrees are the same, the finally matched pulse sequence is determined through the priority, so that the scanning work is prevented from being influenced by the matching error.

In one embodiment, determining a target pulse waveform of a pulse sequence to be executed based on a first pulse waveform corresponding to the pulse sequence to be executed and a second pulse waveform corresponding to a historical pulse sequence with the highest matching degree specifically includes: when the pulse sequence to be executed is not completely matched with the historical pulse sequence with the highest matching degree, acquiring a difference parameter of a first pulse waveform and a second pulse waveform; adjusting the second pulse waveform according to the difference parameter, wherein the obtained waveform is a target pulse waveform of the pulse sequence to be executed; and when the pulse sequence to be executed is completely matched with the historical pulse sequence with the highest matching degree, determining the second pulse waveform as the target pulse waveform of the pulse sequence to be executed.

The complete match means that the matching degree reaches the highest value, for example, if the full scale of the value of the matching degree is a percentile system, the matching degree of 100 indicates a complete match. If the full scale is a tenth scale, a matching degree of 10 indicates a perfect match. The difference parameter refers to data different between the first characterization data and the second characterization data, and it can be understood that the data different between the first characterization data and the second characterization data are both difference parameters that need to be adjusted.

Specifically, when the matching degree between the pulse sequence to be executed and the historical pulse sequence with the highest matching degree does not reach the highest value, the incomplete matching is indicated. The method comprises the steps of comparing first characterization data corresponding to a pulse sequence to be executed with second characterization data corresponding to a historical pulse sequence with the highest matching degree to obtain difference parameters between the first characterization data and the second characterization data, and adjusting a second pulse waveform corresponding to the historical pulse sequence with the highest matching degree through the obtained difference parameters to obtain a target pulse waveform. Namely, a preset adjustment algorithm is obtained, and the adjustment algorithm is a prestored algorithm for adjusting the pulse waveform. And adjusting the difference parameters in the second pulse waveform into the difference parameters in the first pulse waveform by using an adjusting algorithm, thereby obtaining a target pulse waveform consistent with the first pulse waveform corresponding to the pulse sequence to be executed. It can be understood that the second pulse waveform is adjusted to obtain the target pulse waveform, that is, the second pulse waveform is optimized and calculated to obtain a new pulse waveform, and the calculated new pulse waveform is consistent with the first pulse waveform of the pulse sequence to be executed. And when the pulse sequence to be executed is completely matched with the historical pulse sequence with the highest matching degree, namely the matching degree is the highest value, directly determining the second pulse waveform as the target pulse waveform of the pulse sequence to be executed. In this embodiment, the target pulse waveform with the height identical to that of the first pulse waveform is obtained by adjusting the second pulse waveform that is not completely matched, so as to prevent the scanning effect from being affected by the too large difference between the matched second pulse waveform and the first pulse waveform.

In one embodiment, the target pulse waveform is a radio frequency target pulse waveform, as shown in fig. 4, the method for controlling the scanner to transmit the target pulse waveform for magnetic resonance scanning includes the following steps:

step S402, when at least two target pulse waveforms are included, frequency adjustment is respectively carried out on each pulse waveform.

Step S404, controlling the scanner to start the transmitting channels corresponding to the number of the target pulse waveforms, and simultaneously transmitting each target pulse waveform after frequency adjustment by using each transmitting channel.

Specifically, when the transmission mode adopted in the scanning of the magnetic resonance system is multi-channel parallel transmission, the to-be-executed pulse sequence acquired by the scanning may include a plurality of corresponding first radio frequency pulse waveforms, or the scanning may include a plurality of to-be-executed radio frequency pulse sequences, and each different to-be-executed radio frequency pulse sequence has a corresponding first radio frequency pulse waveform. That is, after matching a plurality of different first rf pulse waveforms, a target pulse waveform corresponding to each first rf pulse waveform one-to-one is obtained. That is, when at least two target pulse waveforms are obtained, the frequency of each pulse waveform is adjusted so as to be able to reach the resonance frequency. Then, the scanner is controlled to start the transmitting channels corresponding to the number of the target pulse waveforms, which can be understood as how many target pulse waveforms are, that is, how many corresponding transmitting coils are started. And applying each target pulse waveform to different transmitting coils, and driving all the transmitting coils to simultaneously scan the target pulse waveform transmitted by the scanned object.

In one embodiment, the magnetic resonance system comprises 8 radio frequency transmission coils, each radio frequency transmission coil is connected with a radio frequency power amplifier, namely, each radio frequency coil corresponds to a radio frequency transmission channel, and the phase and the amplitude of a middle radio frequency pulse of each radio frequency transmission channel can be independently controlled by a controller. In the application, a pulse sequence to be executed is firstly obtained, the pulse sequence to be executed comprises eight sub-pulse sequences, and each sub-pulse sequence corresponds to a radio frequency transmitting channel. Then, the pulse sequence to be executed is matched with each historical pulse sequence stored in a memory, specifically, a gradient waveform in each sub-pulse sequence is matched with a gradient waveform of the historical pulse sequence, the highest matching degree of the gradient waveform of each sub-pulse sequence and the gradient waveform of the historical pulse sequence is determined, a radio frequency pulse waveform corresponding to the highest matching degree of the gradient waveform of the historical pulse sequence is determined as a radio frequency waveform of the sub-pulse sequence, and then a target pulse waveform of each radio frequency transmitting channel is obtained. Of course, the number of rf transmit channels is not particularly limited in this application, and in other embodiments, the rf transmit channels may be matched according to the main magnetic field strength, such as 16 channels, 32 channels, 64 channels, or higher.

In one embodiment, the historical pulse sequence is also accompanied by a load, which can be understood as information about the scanned object. Specifically, the object to be scanned may be further matched with the load corresponding to the historical pulse sequence, and when the object to be scanned is consistent with the load corresponding to the historical pulse sequence, the target pulse waveform may be directly executed; when the object to be scanned is inconsistent with the load corresponding to the historical pulse sequence, the radio frequency waveform of the sub-pulse sequence can be dynamically optimized, so that the RF energy absorbed by the object in the scanning process, the peripheral nerve stimulation and the like meet the requirements of regulations.

In one embodiment, after obtaining the target pulse waveform, the pulse sequence to be executed and the target pulse waveform corresponding to the pulse sequence to be executed are added to the memory. That is, the target pulse waveform newly added to the memory may be the second pulse waveform of the history pulse train with the highest matching degree after adjustment, the first pulse waveform of the pulse train to be executed, or the second pulse waveform of the history pulse train with the highest matching degree without adjustment. In order to prevent the memory from occupying resources to store the same pulse waveform, when the obtained target pulse waveform is newly added to the memory, whether the target pulse waveform is the second pulse waveform existing in the memory is further judged. This is the case only when the target pulse waveform is the second pulse waveform of the history pulse train having the highest degree of matching without adjustment. Therefore, it can be understood that whether the target pulse waveform is the second pulse waveform of the unadjusted historical pulse sequence with the highest matching degree is further judged, and if so, the pulse sequence to be executed and the corresponding target pulse waveform are not added into the memory. If not, the target pulse waveform is the first pulse waveform of the pulse sequence to be executed or the second pulse waveform of the history pulse sequence with the highest matching degree after adjustment, and the pulse sequence to be executed and the corresponding target pulse waveform are stored in the memory.

In one embodiment, another method for matching first characterization data with second characterization data is provided, which specifically includes: and respectively matching the first characterization data with each second characterization data based on a preset matching rule by acquiring the preset matching rule, wherein the obtained matching degree is the matching degree of the pulse sequence to be executed and each historical pulse sequence. The matching rule is a preset file storing a rule to be followed when matching, that is, when the first representation data is matched with the second representation data, the matching is performed according to the rule set in the matching rule file. It is to be understood that matching data is included in the matching rule.

Specifically, matching data are determined according to a preset matching rule, and corresponding matching data are respectively obtained from the first characterization data and the second characterization data. And matching the matching data of the first characterization data with the matching data of the second characterization data to obtain the corresponding matching degree. Because the unique characterization data of the pulse waveform is generally divided into four parts, in order to save time, matching can be performed without matching the characterization data of the four parts. Thus, the matching data in the matching rule is the portion of the characterizing data specified by the matching rule for matching. Assuming that four parts of the characterization data are respectively first part characterization data, second part characterization data, third part characterization data and fourth part characterization data, when the matching data specified in the matching rule is the first part characterization data and the third part characterization data, the matching of the first characterization data and the second characterization data is only required to be performed by matching the first part characterization data and the third part characterization data in the first characterization data and the second characterization data, and the matching manner can be performed in any manner. Therefore, the matching time can be saved, and the scanning efficiency is improved. And the preset matching degree is a threshold value for successful matching, when the matching degree is greater than or equal to the preset matching degree, the matched historical pulse sequence exists, otherwise, when all the matching degrees are less than the preset matching degree, the matched historical pulse sequence does not exist.

Further, if matching is performed according to a preset matching rule, when it is determined that the pulse sequence to be executed does not completely match the history pulse sequence with the highest matching degree, the obtained difference parameter between the first pulse waveform and the second pulse waveform is the characterization data except the matching data. That is, if the matching data in the matching rule is the first part of the characterization data and the third part of the characterization data, the difference parameter is the second part of the characterization data and the fourth part of the characterization data. According to an adjusting algorithm, adjusting the second part of characterization data and the fourth part of characterization data in the second characterization data corresponding to the historical pulse sequence with the highest matching degree into the second part of characterization data and the fourth part of characterization data of the first characterization data corresponding to the pulse sequence to be executed, wherein the adjusted second characterization data and the first characterization data have the same second part of characterization data and fourth part of characterization data. Namely, the adjusted characterization data of the four parts corresponding to the target pulse waveform are the first part characterization data and the third part characterization data of the first characterization data corresponding to the historical pulse sequence with the highest matching degree, and the second part characterization data and the fourth part characterization data of the first characterization data corresponding to the pulse sequence to be executed. In this embodiment, fast matching is performed according to matching data in a matching rule, and as long as a matching degree obtained by matching the matching data of the pulse sequence to be executed and the matching data of the historical pulse sequence is greater than or equal to a preset matching degree, it indicates that the historical pulse sequence matched with the pulse sequence to be executed exists, and the characterization data that is not the matching data is directly used as a difference parameter to be adjusted, so that a target pulse waveform is obtained. The method not only ensures that the height of the obtained target pulse waveform is consistent with that of the first pulse waveform of the pulse sequence to be executed, and does not influence the scanning quality, but also accelerates the matching by matching part of characterization data, thereby improving the scanning efficiency.

It should be understood that although the various steps in the flow charts of fig. 1-4 are shown in order as indicated by the arrows, the steps are not necessarily performed in order as indicated by the arrows. The steps are not performed in the exact order shown and described, and may be performed in other orders, unless explicitly stated otherwise. Moreover, at least some of the steps in fig. 1-4 may include multiple sub-steps or multiple stages that are not necessarily performed at the same time, but may be performed at different times, and the order of performance of the sub-steps or stages is not necessarily sequential, but may be performed in turn or alternating with other steps or at least some of the sub-steps or stages of other steps.

In one embodiment, as shown in fig. 5, there is provided a scanning apparatus of a magnetic resonance system comprising: an obtaining module 502, a matching module 504, a determining module 506, and a driving module 508, wherein:

an obtaining module 502 is configured to obtain a pulse sequence to be executed.

The matching module 504 is configured to match the pulse sequence to be executed with each historical pulse sequence stored in the memory, respectively, to obtain a matching degree between the pulse sequence to be executed and each historical pulse sequence.

And a determining module 506, configured to determine a target pulse waveform of the pulse sequence to be executed from the pulse waveforms corresponding to the historical pulse sequence according to the matching degree.

And the driving module 508 is used for controlling the scanner to transmit the target pulse waveform to perform magnetic resonance scanning.

In one embodiment, the matching module 504 is further configured to obtain first characterization data of a first pulse waveform corresponding to the pulse sequence to be executed, and obtain second characterization data of a pulse waveform corresponding to each historical pulse sequence; and respectively matching the first characterization data with each second characterization data, wherein the obtained matching degree is the matching degree of the pulse sequence to be executed and each historical pulse sequence.

In one embodiment, the determining module 506 is further configured to, when it is determined that there is a historical pulse sequence matching the pulse sequence to be executed according to the matching degree, obtain a historical pulse sequence with a highest matching degree with the pulse sequence to be executed; and determining a target pulse waveform of the pulse sequence to be executed based on the first pulse waveform corresponding to the pulse sequence to be executed and the second pulse waveform corresponding to the historical pulse sequence with the highest matching degree.

In one embodiment, the determining module 506 is further configured to obtain a difference parameter between the first pulse waveform and the second pulse waveform when the pulse sequence to be executed does not completely match the history pulse sequence with the highest matching degree; adjusting the second pulse waveform according to the difference parameters, wherein the obtained waveform is a target pulse waveform of the pulse sequence to be executed; and when the pulse sequence to be executed is completely matched with the historical pulse sequence with the highest matching degree, determining the second pulse waveform as the target pulse waveform of the pulse sequence to be executed.

In one embodiment, the determining module 506 is further configured to determine the first pulse waveform corresponding to the pulse sequence to be executed as the target pulse waveform of the pulse sequence to be executed when it is determined that there is no historical pulse sequence matching the pulse sequence to be executed according to the matching degree.

In one embodiment, the determining module 506 is further configured to compare the matching degree with a preset matching degree; if the matching degree is greater than or equal to the preset matching degree, determining that a historical pulse sequence matched with the pulse sequence to be executed exists; and if the matching degree is smaller than the preset matching degree, determining that no historical pulse sequence matched with the pulse sequence to be executed exists.

In one embodiment, the target pulse waveform includes at least one gradient target pulse waveform, and the driving module 508 may be configured to control the scanner to start a gradient emission channel corresponding to a type of the gradient target pulse waveform, where the gradient emission channel may include at least one of an X-axis gradient emission channel, a Y-axis gradient emission channel, and a Z-axis gradient emission channel; and transmitting the gradient target pulse waveform by using the gradient transmitting channel.

In one embodiment, the target pulse waveform may include at least one rf target pulse waveform, and the driving module 508 is further configured to perform frequency adjustment on the rf target pulse waveform; controlling a scanner to start radio frequency transmitting channels with the number corresponding to the radio frequency target pulse waveform; and simultaneously transmitting the radio frequency target pulse waveform after the frequency adjustment by using a radio frequency transmitting channel.

For a specific definition of the scanning apparatus of the magnetic resonance system, reference may be made to the above definition of the scanning method of the magnetic resonance system, which is not described in detail here. The various modules in the scanning apparatus of the magnetic resonance system described above may be implemented in whole or in part by software, hardware, and combinations thereof. The modules can be embedded in a hardware form or independent from a processor in the computer device, and can also be stored in a memory in the computer device in a software form, so that the processor can call and execute operations corresponding to the modules.

In one embodiment, a computer device is provided, which may be a server, and its internal structure diagram may be as shown in fig. 6. The computer device comprises a processor, a memory, a network interface, a database, a display screen and an input device which are connected through a system bus. Wherein the processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device comprises a nonvolatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program, and a database. The internal memory provides an environment for the operation of an operating system and computer programs in the non-volatile storage medium. The database of the computer device is used for storing data. The network interface of the computer device is used for communicating with an external terminal through a network connection. The computer program is executed by a processor to implement a scanning method of a magnetic resonance system. The display screen of the computer equipment can be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer equipment can be a touch layer covered on the display screen, a key, a track ball or a touch pad arranged on the shell of the computer equipment, an external keyboard, a touch pad or a mouse and the like.

Those skilled in the art will appreciate that the architecture shown in fig. 6 is merely a block diagram of some of the structures associated with the disclosed aspects and is not intended to limit the computing devices to which the disclosed aspects apply, as particular computing devices may include more or less components than those shown, or may combine certain components, or have a different arrangement of components.

In one embodiment, a computer device is provided, comprising a memory and a processor, the memory having a computer program stored therein, the processor implementing the following steps when executing the computer program:

acquiring a pulse sequence to be executed;

respectively matching the pulse sequence to be executed with each historical pulse sequence stored in a memory to obtain the matching degree of the pulse sequence to be executed and each historical pulse sequence;

according to the matching degree, determining a target pulse waveform of the pulse sequence to be executed from the pulse waveforms corresponding to the historical pulse sequence;

and controlling the scanner to transmit a target pulse waveform to perform magnetic resonance scanning.

In one embodiment, the processor, when executing the computer program, further performs the steps of: acquiring first characterization data of a first pulse waveform corresponding to a pulse sequence to be executed and acquiring second characterization data of pulse waveforms corresponding to historical pulse sequences; and respectively matching the first characterization data with each second characterization data, wherein the obtained matching degree is the matching degree of the pulse sequence to be executed and each historical pulse sequence.

In one embodiment, the processor, when executing the computer program, further performs the steps of: when determining that a historical pulse sequence matched with the pulse sequence to be executed exists according to the matching degree, acquiring the historical pulse sequence with the highest matching degree with the pulse sequence to be executed; and determining a target pulse waveform of the pulse sequence to be executed based on the first pulse waveform corresponding to the pulse sequence to be executed and the second pulse waveform corresponding to the historical pulse sequence with the highest matching degree.

In one embodiment, the processor, when executing the computer program, further performs the steps of: when the pulse sequence to be executed is not completely matched with the historical pulse sequence with the highest matching degree, acquiring a difference parameter of a first pulse waveform and a second pulse waveform; adjusting the second pulse waveform according to the difference parameters, wherein the obtained waveform is a target pulse waveform of the pulse sequence to be executed; and when the pulse sequence to be executed is completely matched with the historical pulse sequence with the highest matching degree, determining the second pulse waveform as the target pulse waveform of the pulse sequence to be executed.

In one embodiment, the processor, when executing the computer program, further performs the steps of: and when determining that no historical pulse sequence matched with the pulse sequence to be executed exists according to the matching degree, determining a first pulse waveform corresponding to the pulse sequence to be executed as a target pulse waveform of the pulse sequence to be executed.

In one embodiment, the processor, when executing the computer program, further performs the steps of: comparing the matching degree with a preset matching degree; if the matching degree is greater than or equal to the preset matching degree, determining that a historical pulse sequence matched with the pulse sequence to be executed exists; and if the matching degree is smaller than the preset matching degree, determining that no historical pulse sequence matched with the pulse sequence to be executed exists.

In one embodiment, the processor, when executing the computer program, further performs the steps of: controlling the scanner to start a gradient emission channel corresponding to the gradient target pulse waveform type, wherein the gradient emission channel can comprise at least one of an X-axis gradient emission channel, a Y-axis gradient emission channel and a Z-axis gradient emission channel; and transmitting the gradient target pulse waveform by using the gradient transmitting channel.

In one embodiment, the processor, when executing the computer program, further performs the steps of: carrying out frequency adjustment on the radio frequency target pulse waveform; controlling a scanner to start radio frequency transmitting channels with the number corresponding to the radio frequency target pulse waveform; and simultaneously transmitting the radio frequency target pulse waveform after the frequency adjustment by using a radio frequency transmitting channel.

In one embodiment, a computer-readable storage medium is provided, having a computer program stored thereon, which when executed by a processor, performs the steps of:

acquiring a pulse sequence to be executed;

In one embodiment, the computer program when executed by the processor further performs the steps of: acquiring first characterization data of a first pulse waveform corresponding to a pulse sequence to be executed and acquiring second characterization data of pulse waveforms corresponding to historical pulse sequences; and respectively matching the first characterization data with each second characterization data, wherein the obtained matching degree is the matching degree of the pulse sequence to be executed and each historical pulse sequence.

In one embodiment, the computer program when executed by the processor further performs the steps of: when determining that a historical pulse sequence matched with the pulse sequence to be executed exists according to the matching degree, acquiring the historical pulse sequence with the highest matching degree with the pulse sequence to be executed; and determining a target pulse waveform of the pulse sequence to be executed based on the first pulse waveform corresponding to the pulse sequence to be executed and the second pulse waveform corresponding to the historical pulse sequence with the highest matching degree.

In one embodiment, the computer program when executed by the processor further performs the steps of: when the pulse sequence to be executed is not completely matched with the historical pulse sequence with the highest matching degree, acquiring a difference parameter of a first pulse waveform and a second pulse waveform; adjusting the second pulse waveform according to the difference parameters, wherein the obtained waveform is a target pulse waveform of the pulse sequence to be executed; and when the pulse sequence to be executed is completely matched with the historical pulse sequence with the highest matching degree, determining the second pulse waveform as the target pulse waveform of the pulse sequence to be executed.

In one embodiment, the computer program when executed by the processor further performs the steps of:

and when determining that no historical pulse sequence matched with the pulse sequence to be executed exists according to the matching degree, determining a first pulse waveform corresponding to the pulse sequence to be executed as a target pulse waveform of the pulse sequence to be executed.

In one embodiment, the computer program when executed by the processor further performs the steps of: comparing the matching degree with a preset matching degree; if the matching degree is greater than or equal to the preset matching degree, determining that a historical pulse sequence matched with the pulse sequence to be executed exists; and if the matching degree is smaller than the preset matching degree, determining that no historical pulse sequence matched with the pulse sequence to be executed exists.

In one embodiment, the computer program when executed by the processor further performs the steps of: controlling a scanner to start a gradient emission channel corresponding to the gradient target pulse waveform type, wherein the gradient emission channel comprises at least one of an X-axis gradient emission channel, a Y-axis gradient emission channel and a Z-axis gradient emission channel; and transmitting the gradient target pulse waveform by using the gradient transmitting channel.

In one embodiment, the computer program when executed by the processor further performs the steps of: carrying out frequency adjustment on the radio frequency target pulse waveform; controlling a scanner to start radio frequency transmitting channels with the number corresponding to the radio frequency target pulse waveform; and simultaneously transmitting the radio frequency target pulse waveform after the frequency adjustment by using a radio frequency transmitting channel.

It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware instructions of a computer program, which can be stored in a non-volatile computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. Any reference to memory, storage, database, or other medium used in the embodiments provided herein may include non-volatile and/or volatile memory, among others. Non-volatile memory can include read-only memory (ROM), Programmable ROM (PROM), Electrically Programmable ROM (EPROM), Electrically Erasable Programmable ROM (EEPROM), or flash memory. Volatile memory can include Random Access Memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms such as Static RAM (SRAM), Dynamic RAM (DRAM), Synchronous DRAM (SDRAM), Double Data Rate SDRAM (DDRSDRAM), Enhanced SDRAM (ESDRAM), Synchronous Link DRAM (SLDRAM), Rambus Direct RAM (RDRAM), direct bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).

The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. A method of scanning a magnetic resonance system, the method comprising:

acquiring a pulse sequence to be executed;

determining a target pulse waveform of the pulse sequence to be executed based on a first pulse waveform corresponding to the pulse sequence to be executed and a second pulse waveform corresponding to the historical pulse sequence with the highest matching degree;

controlling a scanner to transmit the target pulse waveform to perform magnetic resonance scanning;

the determining a target pulse waveform of the pulse sequence to be executed based on the first pulse waveform corresponding to the pulse sequence to be executed and the second pulse waveform corresponding to the historical pulse sequence with the highest matching degree includes:

and adjusting the second pulse waveform according to the difference parameter, wherein the obtained waveform is the target pulse waveform of the pulse sequence to be executed.

2. The method according to claim 1, wherein the matching the pulse sequence to be executed with each historical pulse sequence stored in a memory to obtain a matching degree between the pulse sequence to be executed and each historical pulse sequence comprises:

3. The method according to claim 1, wherein the determining a target pulse waveform of the pulse sequence to be executed based on a first pulse waveform corresponding to the pulse sequence to be executed and a second pulse waveform corresponding to the history pulse sequence with the highest matching degree further comprises:

4. The method of claim 1, further comprising:

5. The method according to claim 1, wherein when it is determined that there is the historical pulse sequence matching the pulse sequence to be executed according to the matching degree, before acquiring the historical pulse sequence matching the pulse sequence to be executed with the highest degree, the method comprises:

comparing the matching degree with a preset matching degree;

6. The method of claim 1, wherein the target pulse waveform comprises at least one gradient target pulse waveform;

and transmitting the gradient target pulse waveform by using the gradient transmitting channel.

7. The method of claim 1, wherein the target pulse waveform comprises at least one radio frequency target pulse waveform;

adjusting the frequency of the radio frequency target pulse waveform;

8. The method according to claim 1, wherein the historical pulse sequence is accompanied by a load, and the determining the target pulse waveform of the pulse sequence to be executed based on the first pulse waveform corresponding to the pulse sequence to be executed and the second pulse waveform corresponding to the historical pulse sequence with the highest matching degree further comprises:

determining that the pulse sequence to be executed is completely matched with the historical pulse sequence with the highest matching degree;

and determining whether the object to be scanned is consistent with the load, optimizing the second pulse waveform radio frequency waveform when the object to be scanned is inconsistent with the load, and taking the optimized second pulse waveform as the target pulse waveform of the pulse sequence to be executed.

9. A computer device comprising a memory and a processor, the memory storing a computer program, wherein the processor implements the steps of the method of any one of claims 1 to 8 when executing the computer program.

10. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the method of any one of claims 1 to 8.