Magnetic Resonance Angiography Method, Apparatus, Electronic Device, and Storage Medium

Abstract

The present application relates to a magnetic resonance angiography method, apparatus, electronic device, and storage medium. Among them, the magnetic resonance angiography method includes: determining the relative position between the saturation band and the imaging band according to the blood flow direction of the target blood vessel; determining the polarities of the slice selection gradients of the saturation band and the imaging band based on the relative position, as well as the resonance frequency magnitudes of the target base substance and the interfering base substance; determining the slice selection gradient magnitude of the saturation band based on the interval distance between the saturation band and the imaging band and the slice selection gradient magnitude of the imaging band; or determining the slice selection gradient magnitude of the imaging band based on the interval distance between the saturation band and the imaging band and the slice selection gradient magnitude of the saturation band; scanning the target blood vessel based on the slice selection gradient polarities of the saturation band and the imaging band and the slice selection gradient magnitudes of the saturation band and the imaging band to generate a target blood vessel image. Through the present application, the artifacts in magnetic resonance angiography are reduced, and the imaging efficiency of magnetic resonance angiography is improved.

Description

Technical Field

[0001] The present application relates to the field of medical imaging technology, and particularly to a magnetic resonance angiography method, device, electronic device, and storage medium. Background Art

[0002] Magnetic resonance angiography (MRA) is a non-invasive vascular imaging method that does not require intubation or contrast agents and has been widely used in clinical practice.

[0003] Due to the chemical shift caused by the resonance frequency difference between water and fat in the imaging band, artifacts exist in the layer direction during magnetic resonance angiography. At a certain main magnetic field strength, the chemical shift between water and fat decreases with the increase of the excitation bandwidth. To reduce artifacts, related technicians usually increase the excitation bandwidth continuously. However, reducing artifacts by continuously increasing the excitation bandwidth will increase the SAR of the scan and affect the use of magnetic resonance angiography.

[0004] In time-of-flight (TOF) imaging of magnetic resonance, fat signals will affect the observation of blood signals. Generally, by setting the scan protocol parameters to water-fat opposed phase, the effect of fat suppression can be achieved. At this time, if a more ideal fat suppression effect is desired, fat suppression technology is generally required, but this requires an additional scan time and affects the imaging efficiency of magnetic resonance angiography.

[0005] Regarding the problem of low imaging efficiency of magnetic resonance angiography in the related art, no effective solution has been proposed yet. Summary of the Invention

[0006] In this embodiment, a magnetic resonance angiography method, device, electronic device, and storage medium are provided to solve the problem of low imaging efficiency of magnetic resonance angiography in the related art.

[0007] In a first aspect, in this embodiment, a magnetic resonance angiography method is provided, and the method includes:

[0008] Determine the relative position between the saturation band and the imaging band according to the blood flow direction of the target blood vessel, where the saturation band is used to suppress the blood imaging of non-target blood vessels;

[0009] Based on the relative position, and the resonance frequency magnitudes of the target basis substance and the interfering basis substance, determine the slice selection gradient polarities of the saturation band and the imaging band;

[0010] Based on the interval distance between the saturation band and the imaging band and the slice selection gradient amplitude of the imaging band, determine the slice selection gradient amplitude of the saturation band;

[0011] Determine the slice selection gradient amplitude of the imaging band based on the interval distance between the saturation band and the imaging band and the slice selection degree amplitude of the saturation band;

[0012] Scan the target blood vessel based on the slice selection gradient polarities of the saturation band and the imaging band and the slice selection gradient amplitudes of the saturation band and the imaging band, and generate a target blood vessel image.

[0013] In some embodiments, before determining the relative position between the saturation band and the imaging band according to the blood flow direction of the target blood vessel, it includes:

[0014] In response to a user instruction, determine the target blood vessel, where the target blood vessel is a venous blood vessel or an arterial blood vessel.

[0015] In some embodiments, the determining the slice selection gradient amplitude of the saturation band based on the interval distance between the saturation band and the imaging band and the slice selection gradient amplitude of the imaging band includes:

[0016] In response to a user instruction, determine the slice selection gradient amplitude of the imaging band, and based on the slice selection gradient amplitude of the imaging band, determine a first offset in the imaging band, where the first offset is the offset of the imaging position of the interfering base substance in the imaging band relative to the imaging position of the target base substance under the slice selection gradient amplitude of the imaging band;

[0017] Based on the first offset and the interval distance, determine a second offset in the saturation band, where the second offset is the desired offset of the imaging position of the interfering base substance in the saturation band relative to the imaging position of the target base substance;

[0018] Determine the slice selection gradient amplitude of the saturation band based on the second offset.

[0019] In some embodiments, the determining the slice selection gradient amplitude of the saturation band based on the second offset includes:

[0020] Determine the resonance frequency difference between the target base substance and the interfering base substance under the main magnetic field;

[0021] Based on the resonance frequency difference and the second offset, determine the slice selection gradient amplitude of the saturation band.

[0022] In some embodiments, the determining the slice selection gradient amplitude of the saturation band based on the resonance frequency difference and the second offset includes:

[0023] Determine the thickness of the saturation band;

[0024] Determine the excitation pulse bandwidth of the saturation band based on the resonance frequency difference, the thickness of the saturation band, and the second offset;

[0025] Determine the slice selection gradient amplitude of the saturation band based on the excitation pulse bandwidth of the saturation band.

[0026] In some embodiments, the determining the slice selection gradient amplitude of the saturation band based on the excitation pulse bandwidth of the saturation band includes:

[0027] Determine the slice selection gradient amplitude of the saturation band based on the excitation pulse bandwidth of the saturation band and the thickness of the saturation band.

[0028] In some embodiments, the determining the slice selection gradient amplitude of the imaging band based on the interval distance between the saturation band and the imaging band and the slice selection amplitude of the saturation band includes:

[0029] In response to a user instruction, determine the slice selection gradient amplitude of the saturation band, and based on the slice selection gradient amplitude of the saturation band, determine a second offset in the saturation band, where the second offset is the offset of the imaging position of the interfering base substance in the saturation band relative to the imaging position of the target base substance under the slice selection gradient amplitude of the saturation band;

[0030] Based on the second offset and the interval distance, determine a first offset in the imaging band, where the first offset is the desired offset of the imaging position of the interfering base substance in the imaging band relative to the imaging position of the target base substance;

[0031] Determine the slice selection gradient amplitude of the imaging band based on the first offset.

[0032] In some embodiments, the determining the slice selection gradient amplitude of the imaging band based on the first offset includes:

[0033] Determine the resonance frequency difference between the target base substance and the interfering base substance under the main magnetic field;

[0034] Based on the resonance frequency difference and the first offset, determine the slice selection gradient amplitude of the imaging band.

[0035] In some embodiments, the determining the slice selection gradient amplitude of the imaging band based on the resonance frequency difference and the first offset includes:

[0036] Determine the thickness of the imaging band;

[0037] Based on the resonance frequency difference, the thickness of the imaging band, and the first offset, determine the excitation pulse bandwidth of the imaging band;

[0038] Determine the slice selection gradient amplitude of the imaging band based on the excitation pulse bandwidth of the imaging band.

[0039] In some embodiments, the determining the slice selection gradient amplitude of the imaging band based on the excitation pulse bandwidth of the imaging band includes:

[0040] Determine the slice selection gradient amplitude of the imaging band based on the excitation pulse bandwidth of the imaging band and the thickness of the imaging band.

[0041] In some embodiments, the sum of the first offset and the second offset is greater than the distance between the saturation band and the imaging band.

[0042] In a second aspect, a magnetic resonance angiography apparatus is provided in this embodiment, including:

[0043] A first determination module, configured to determine the relative position between the saturation band and the imaging band according to the blood flow direction of the target blood vessel, where the saturation band is used to suppress blood imaging of non-target blood vessels;

[0044] A second determination module, configured to determine the slice selection gradient polarities of the saturation band and the imaging band based on the relative position and the resonance frequency magnitudes of the target basis substance and the interfering basis substance;

[0045] A third determination module, configured to determine the slice selection gradient amplitude of the saturation band based on the distance between the saturation band and the imaging band and the slice selection gradient amplitude of the imaging band;

[0046] Or configured to determine the slice selection gradient amplitude of the imaging band based on the distance between the saturation band and the imaging band and the slice selection gradient amplitude of the saturation band;

[0047] An imaging module, configured to scan the target blood vessel based on the slice selection gradient polarities of the saturation band and the imaging band and the slice selection gradient amplitudes of the saturation band and the imaging band, and generate a target blood vessel image.

[0048] In a third aspect, an electronic device is provided in this embodiment, including a memory, a processor, and a computer program stored on the memory and executable on the processor. When the processor executes the computer program, the magnetic resonance angiography method described in the first aspect above is implemented.

[0049] In a fourth aspect, a storage medium is provided in this embodiment, on which a computer program is stored. When the program is executed by a processor, the magnetic resonance angiography method described in the first aspect above is implemented.

[0050] Compared with the related art, in a magnetic resonance angiography method provided in this embodiment, the relative position between the saturation band and the imaging band is determined according to the blood flow direction of the target blood vessel, so as to determine whether the saturation band is located above or below the imaging band. Further, based on the relative position, as well as the resonance frequency magnitudes of the target base substance and the interfering base substance, the slice selection gradient polarities of the saturation band and the imaging band are determined, so that the imaging position of the interfering base substance in the saturation band is towards the imaging band, and the imaging position of the interfering base substance in the imaging band is towards the saturation band. Further, based on the interval distance between the saturation band and the imaging band and the slice selection gradient amplitude of the imaging band, the slice selection gradient amplitude of the saturation band is determined; or based on the interval distance between the saturation band and the imaging band and the slice selection gradient amplitude of the saturation band, the slice selection gradient amplitude of the imaging band is determined, so that the interfering base substance in the saturation band can block the interfering base substance in the imaging band. Further, the target blood vessel is scanned based on the slice selection gradient polarities and the slice selection gradient amplitudes of the saturation band and the imaging band to generate a target blood vessel image, thereby reducing the imaging range of the interfering base substance in the imaging band, that is, reducing the artifacts in the imaging band of the target blood vessel image. In this way, there is no need to weaken the artifacts by continuously exciting the bandwidth, nor is it necessary to additionally increase the scanning time, effectively improving the imaging efficiency of magnetic resonance angiography.

[0051] Details of one or more embodiments of the present application are set forth in the following drawings and description to make other features, objects, and advantages of the present application more concise and understandable. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments and descriptions of the present application are used to explain the present application and do not constitute an improper limitation of the present application. In the drawings:

[0053] Figure 1 is a hardware structure block diagram of a terminal of a magnetic resonance angiography method provided by an embodiment of the present application.

[0054] Figure 2 is a flowchart of a magnetic resonance angiography method provided by an embodiment of the present application.

[0055] Figure 3 is a schematic diagram of the positions of the imaging band and the saturation band in a venous angiography provided by an embodiment of the present application.

[0056] Figure 4 is a schematic diagram of the imaging positions of water and fat in the imaging band under a positive slice selection gradient polarity provided by an embodiment of the present application.

[0057] Figure 5It is a schematic diagram of the imaging positions of water and fat in the imaging band under the negative selection layer gradient polarity provided by an embodiment of the present application.

[0058] Figure 6 It is a structural block diagram of a magnetic resonance angiography device provided by an embodiment of the present application. Detailed implementation manners

[0059] To understand the purpose, technical solution and advantages of the present application more clearly, the present application will be described and illustrated below with reference to the accompanying drawings and embodiments.

[0060] Unless otherwise defined, the technical terms or scientific terms involved in the present application shall have the general meanings understood by those with ordinary skills in the technical field to which the present application belongs. In the present application, words such as "a", "one", "a kind of", "the", "these" and the like do not indicate a limitation in quantity, and they can be singular or plural. The terms "including", "comprising", "having" and any variants thereof involved in the present application are intended to cover non-exclusive inclusion; for example, a process, method, system, product or device including a series of steps or modules (units) is not limited to the listed steps or modules (units), but may include unlisted steps or modules (units), or may include other steps or modules (units) inherent in these processes, methods, products or devices. The terms "connected", "coupled" and the like involved in the present application are not limited to physical or mechanical connections, but may include electrical connections, whether directly or indirectly connected. The "plurality" involved in the present application means two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships can exist. For example, "A and / or B" can mean: A exists alone, A and B exist simultaneously, and B exists alone. Usually, the character " / " indicates that the associated objects before and after are an "or" relationship. The terms "first", "second", "third" and the like involved in the present application are only used to distinguish similar objects and do not represent a specific sorting for the objects.

[0061] In the method embodiment provided in this embodiment, it can be executed on a terminal, a computer or a similar computing device. For example, it runs on a terminal. Figure 1 It is a hardware structural block diagram of a terminal of a magnetic resonance angiography method provided by an embodiment of the present application. As Figure 1 shown, the terminal may include one or more ( Figure 1 only one is shown in the figure) processors 102 and a memory 104 for storing data. Among them, the processor 102 may include, but is not limited to, a processing device such as a microprocessor MCU or a field programmable gate array FPGA. The above terminal may also include a transmission device 106 for communication functions and an input / output device 108. Those of ordinary skill in the art can understand thatFigure 1 The structure shown is only schematic and does not limit the structure of the above terminal. For example, the terminal may further include more or fewer components than those shown in Figure 1 or have a different configuration from that shown in Figure 1 .

[0062] The memory 104 can be used to store computer programs, for example, software programs and modules of application software, such as the computer program corresponding to a magnetic resonance angiography method in this embodiment. The processor 102 executes various functional applications and data processing by running the computer program stored in the memory 104, that is, implements the above method. The memory 104 may include high-speed random access memory and may also include non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memories. In some embodiments, the memory 104 may further include a memory remotely disposed relative to the processor 102, and these remote memories can be connected to the terminal through a network. Examples of the above network include but are not limited to the Internet, enterprise intranet, local area network, mobile communication network, and combinations thereof.

[0063] The transmission device 106 is used to receive or send data via a network. The above network includes a wireless network provided by the communication provider of the terminal. In one embodiment, the transmission device 106 includes a network adapter (Network Interface Controller, abbreviated as NIC), which can be connected to other network devices through a base station and thus communicate with the Internet. In one embodiment, the transmission device 106 can be a radio frequency (RF) module, which is used to communicate with the Internet wirelessly.

[0064] Magnetic resonance angiography (MRA) is a non-invasive angiography method that does not require intubation or contrast agents and has been widely used in clinical practice.

[0065] Due to the chemical shift caused by the resonance frequency difference between water and fat in the imaging plane, there are artifacts in the layer direction during magnetic resonance angiography. When the main magnetic field strength is constant, the chemical shift between water and fat decreases with the increase of the excitation bandwidth. In order to reduce the artifacts, related technicians usually increase the excitation bandwidth continuously. However, reducing the artifacts by continuously increasing the excitation bandwidth will cause an increase in the SAR of the scan, which affects the use of magnetic resonance angiography.

[0066] In time-of-flight (TOF) magnetic resonance imaging, fat signals can affect the observation of blood signals. Generally, by setting the scanning protocol parameters to water-fat opposed phase, the effect of fat suppression can be achieved. At this time, if a more ideal fat suppression effect is desired, fat suppression techniques are generally required, but this requires an additional scanning time, which affects the imaging efficiency of magnetic resonance angiography.

[0067] Therefore, how to improve the imaging efficiency of magnetic resonance angiography is a problem that needs to be solved.

[0068] In this embodiment, a magnetic resonance angiography method is provided. Figure 2 It is a flowchart of a magnetic resonance angiography method provided by an embodiment of the present application. The execution subject of this method can be an electronic device. Optionally, the electronic device can be a server or a terminal device, but the present application is not limited thereto. As Figure 2 shown, the process includes the following steps:

[0069] Step S201, determine the relative position between the saturation band and the imaging band according to the blood flow direction of the target blood vessel.

[0070] Among them, the saturation band is used to suppress the blood imaging of non-target blood vessels.

[0071] Exemplarily, in TOF imaging in MRA, the imaging principle mainly utilizes the inflow enhancement effect of blood and the saturation of static tissues. When TOF is used for vascular imaging, through the action of exciting radiofrequency pulses, the stationary tissues in the action layer are in a saturated state, while the inflowing fresh blood is not affected by the exciting pulse and is in an unsaturated state, showing a high-intensity signal. In this way, an obvious difference is formed between the saturated stationary tissues and the unsaturated fresh blood. TOF performs MRA imaging based on this inflow enhancement effect. When TOF is used for arteries, veins need to be suppressed, and vice versa. Usually, the saturation pulse of the saturation band is placed outside the imaging band, so as to saturate the unwanted blood flow signals, so that the saturated blood flow signals are low signals when flowing into the imaging band and do not affect the blood flow signals to be imaged.

[0072] Since the blood flow directions of arterial blood vessels and venous blood vessels are different, therefore, when performing TOF vascular imaging, the blood flow direction of the target blood vessel affects the relative position between the imaging band and the saturation band. Therefore, the relative position between the saturation band and the imaging band is determined according to the blood flow direction of the target blood vessel.

[0073] Step S202, based on the relative position, and the resonance frequency magnitudes of the target basis substance and the interfering basis substance, determine the slice selection gradient polarities of the saturation band and the imaging band.

[0074] Among them, the polarities of the slice selection gradients of the saturation band and the imaging band are opposite, and both the imaging band and the saturation band include the target base substance and the interfering base substance.

[0075] As an example, both the saturation band and the imaging band include the target base substance and the interfering base substance, and the imaging position of the interfering base substance relative to the target base substance is jointly determined by the polarity of the slice selection gradient and the magnitudes of the resonance frequencies of the target base substance and the interfering base substance.

[0076] When the magnitudes of the resonance frequencies of the target base substance and the interfering base substance are determined, the imaging position of the interfering base substance relative to the target base substance is different under different polarities of the slice selection gradient. If the resonance frequency of the target base substance is greater than that of the interfering base substance, the frequency value of the imaging position of the target base substance is greater than that of the imaging position of the interfering base substance in a certain direction. Conversely, if the resonance frequency of the target base substance is less than that of the interfering base substance, the frequency value of the imaging position of the target base substance is less than that of the imaging position of the interfering base substance in a certain direction.

[0077] When the target base substance is water in blood and the interfering base substance is fat, since the resonance frequency of water is greater than that of fat, taking the upward direction as the positive direction, if the polarity of the slice selection gradient is positive, the imaging position of water is above the imaging position of fat; if the polarity of the slice selection gradient is changed to negative, the imaging position of water is below the imaging position of fat.

[0078] Therefore, according to the relative positions between the saturation band and the imaging band, and the magnitudes of the resonance frequencies of the target base substance and the interfering base substance, determine the polarities of the slice selection gradients of the saturation band and the imaging band, so that the imaging position of the interfering base substance in the saturation band is towards the imaging band direction, and the imaging position of the interfering base substance in the imaging band is towards the saturation band direction.

[0079] It should be noted that this application only takes the target base substance as water in blood and the interfering base substance as fat as an example for illustration. In practical applications, in order to obtain the imaging of fat, it is also possible that the target base substance is fat and the interfering base substance is water in blood, which is not limited here.

[0080] Step S203, determine the slice selection gradient magnitude of the saturation band based on the interval distance between the saturation band and the imaging band and the slice selection gradient magnitude of the imaging band, or determine the slice selection gradient magnitude of the imaging band based on the interval distance between the saturation band and the imaging band and the slice selection gradient magnitude of the saturation band.

[0081] As an embodiment, determine the slice selection gradient magnitude of the saturation band based on the interval distance between the saturation band and the imaging band and the slice selection gradient magnitude of the imaging band.

[0082] Exemplarily, obtain the slice selection gradient amplitude of the imaging band, and determine the obtained slice selection gradient amplitude of the imaging band as the slice selection gradient amplitude of the imaging band in practical applications.

[0083] It should be noted that the obtained slice selection gradient amplitude of the imaging band in the embodiments of the present application can be preset according to experience, and clear blood vessel images can be obtained under the preset slice selection gradient amplitude of the imaging band, or can be set by the user according to needs, and no limitation is made here.

[0084] Further, determine the slice selection gradient amplitude of the saturation band according to the interval distance between the saturation band and the imaging band and the slice selection gradient amplitude of the imaging band.

[0085] Exemplarily, in order to enable the interfering base substances in the saturation band to block the interfering base substances in the imaging band, determine the slice selection gradient amplitude of the saturation band according to the interval distance between the saturation band and the imaging band and the slice selection gradient amplitude of the imaging band, so that the offset of the imaging position of the interfering base substances in the saturation band relative to the imaging position of the target base substance can block the interfering base substances in the imaging band within the interval range between the saturation band and the imaging band.

[0086] Specifically, when, under the determined slice selection gradient amplitude of the saturation band, the offset of the imaging position of the interfering base substances in the saturation band relative to the imaging position of the target base substance is greater than or equal to the interval distance between the saturation band and the imaging band, and the imaging position of the interfering base substances in the imaging band is towards the saturation band, that is, at least part of the imaging position of the interfering base substances in the imaging band is between the saturation band and the imaging band, then the interfering base substances in the saturation band can block the interfering base substances in the imaging band that fall between the saturation band and the imaging band, so that the interfering base substances in the saturation band can saturate part of the interfering base substances in the imaging band.

[0087] It should be noted that in the saturation band, the imaging position of the target base substance coincides with the saturation band position, and the offset of the imaging position of the interfering base substances in the saturation band relative to the imaging position of the target base substance is the offset of the imaging position of the interfering base substances relative to the saturation band position; similarly, in the imaging band, the imaging position of the target base substance coincides with the imaging band position, and the offset of the imaging position of the interfering base substances in the imaging band relative to the imaging position of the target base substance is the offset of the imaging position of the interfering base substances relative to the imaging band position.

[0088] Or, as another embodiment, determine the slice selection gradient amplitude of the imaging band based on the interval distance between the saturation band and the imaging band and the slice selection gradient amplitude of the saturation band.

[0089] Exemplarily, obtain the slice selection gradient amplitude of the saturation band, and determine the obtained slice selection gradient amplitude of the saturation band as the slice selection gradient amplitude of the saturation band in practical applications.

[0090] It should be noted that the slice selection gradient amplitude of the obtained saturation band in the embodiments of the present application can be preset according to experience, and clear blood vessel images can be obtained under the preset slice selection gradient amplitude of the saturation band, or can be set by the user according to needs, and no limitation is made here.

[0091] Further, according to the interval distance between the saturation band and the imaging band and the slice selection degree amplitude of the saturation band, the slice selection gradient amplitude of the imaging band is determined.

[0092] Exemplarily, in order to enable the interfering base substances in the saturation band to block the interfering base substances in the imaging band, the slice selection gradient amplitude of the imaging band is determined according to the interval distance between the saturation band and the imaging band and the slice selection gradient amplitude of the saturation band, so that the offset of the imaging position of the interfering base substances in the imaging band relative to the imaging position of the target base substances after determination is within the interval range between the saturation band and the imaging band and can be blocked by the interfering base substances in the saturation band.

[0093] Specifically, when the offset of the imaging position of the interfering base substances in the imaging band relative to the imaging position of the target base substances is greater than or equal to the interval distance between the saturation band and the imaging band under the determined slice selection gradient amplitude of the imaging band, and the imaging position of the interfering base substances in the saturation band is in the direction of the imaging band, that is, at least part of the imaging position of the interfering base substances in the imaging band is between the saturation band and the imaging band and can be blocked by the interfering base substances in the saturation band, so that the interfering base substances in the saturation band can saturate part of the interfering base substances in the imaging band.

[0094] Step S204, scan the target blood vessels based on the slice selection gradient polarities of the saturation band and the imaging band and the slice selection gradient amplitudes of the saturation band and the imaging band, and generate a target blood vessel image.

[0095] Further, according to the determined slice selection gradient polarity of the saturation band and the slice selection gradient amplitude of the saturation band, the pulse of the saturation band is excited, and according to the determined slice selection gradient polarity of the imaging band and the slice selection gradient amplitude of the imaging band, the pulse of the imaging band is excited, and the target blood vessels are scanned, so as to obtain a target blood vessel image, and part of the interfering base substances in the imaging band are saturated by the interfering base substances in the saturation band, thereby reducing the artifacts in the layer direction during magnetic resonance angiography.

[0096] In the above implementation process, according to the relative positions between the saturation band and the imaging band, and the resonance frequency magnitudes of the target base substance and the interfering base substance, the slice selection gradient polarities of the saturation band and the imaging band are determined, so that the imaging positions of the interfering base substances in the saturation band are towards the imaging band, and the imaging positions of the interfering base substances in the imaging band are towards the saturation band. Further, based on the interval distance between the saturation band and the imaging band and the slice selection gradient amplitude of the imaging band, the slice selection gradient amplitude of the saturation band is determined; or based on the interval distance between the saturation band and the imaging band and the slice selection gradient amplitude of the saturation band, the slice selection gradient amplitude of the imaging band is determined, so that the interfering base substances in the saturation band can block the interfering base substances in the imaging band. Further, based on the slice selection gradient polarities and the slice selection gradient amplitudes of the saturation band and the imaging band, the target blood vessel is scanned to generate a target blood vessel image, so that the saturation band can saturate part or all of the fat, thereby suppressing the imaging of the fat in the imaging band, reducing the artifacts in the target blood vessel image, and without the need to continuously increase the excitation bandwidth to reduce the artifacts, nor using fat suppression techniques, which increases the additional scanning time. Further, the imaging efficiency of magnetic resonance angiography is improved.

[0097] In some of these embodiments, before determining the relative positions between the saturation band and the imaging band according to the blood flow direction of the target blood vessel, it may further include: in response to a user instruction, determining the target blood vessel, where the target blood vessel is a venous blood vessel or an arterial blood vessel.

[0098] Exemplarily, before the blood flow direction of the target blood vessel determines the relative positions between the saturation band and the imaging band, the user may further generate a user instruction according to the scan protocol parameters and send it to the electronic device. Further, the electronic device receives the user's user instruction, and this user instruction is used to determine the target blood vessel, where the target blood vessel may be a venous blood vessel or an arterial blood vessel.

[0099] Exemplarily, if the user instruction is to use the venous blood vessel as the target blood vessel, TOF acts on the venous blood vessel. Figure 3 It is a schematic diagram of the positions of the imaging band and the saturation band for venous blood vessel imaging provided by an embodiment of the present application. As Figure 3 shown, when performing venous blood vessel imaging, the venous blood flow of the venous blood vessel is downward, and the arterial blood flow of the arterial blood vessel is upward. In order to suppress the imaging of the blood in the arterial blood vessel, the saturation band 302 is placed below the imaging band 301. When the arterial blood is excited by the saturation pulse of the saturation band 302, the arterial blood flowing into the imaging band 301 shows a low signal.

[0100] Further, in Figure 3In the shown position, since the resonance frequency of water is higher than that of fat and the saturation band 302 is located below the imaging band 301, in order to make the imaging position of fat in the saturation band 302 move towards the imaging band 301, the slice selection gradient polarity direction of the saturation band 302 is determined to be downward. In order to make the imaging position of fat in the imaging band 301 move towards the saturation band 302, the slice selection gradient polarity direction of the imaging band 301 is determined to be upward. Under the upward slice selection gradient polarity of the imaging band 301, the imaging position of fat in the imaging band 301 is below the imaging position of water. At this time, the imaging position of fat in the lower saturation band 302 is above the imaging position of water. The imaging positions of fat in the imaging band 301 and the saturation band 302 approach each other, and there are imaging positions of some fat located between the imaging band 301 and the saturation band 302. Further, according to the interval distance between the saturation band and the imaging band and the slice selection gradient amplitude of the imaging band, the slice selection gradient amplitude of the saturation band is determined, so that the fat in the saturation band 302 blocks part of the fat in the imaging band 301, or according to the interval distance between the saturation band and the imaging band and the slice selection gradient amplitude of the saturation band, the slice selection gradient amplitude of the imaging band is determined, so that part or all of the fat in the imaging band 301 is blocked by the fat in the saturation band 302, thereby reducing the artifacts in the target image.

[0101] As Figure 3 shown, the saturation band 302 is below the imaging band 301, and the interval distance between the saturation band 302 and the imaging band 301 is the distance between the lower edge of the imaging band 301 and the upper edge of the saturation band 302. In another embodiment, if the saturation band is above the imaging band, the interval distance between the saturation band and the imaging band is the distance between the lower edge of the saturation band and the upper edge of the imaging band.

[0102] It should be noted that in the embodiments of the present application, only the venous blood vessel is taken as an example of the target blood vessel for illustration. In practical applications, the target blood vessel can also be an arterial blood vessel. At this time, the saturation band is above the imaging band, and the target blood vessel can be determined according to the actual situation, which is not limited here.

[0103] In the above implementation process, the target blood vessel is determined according to the user instruction, which is convenient for further determining the relative position between the saturation band and the imaging band according to the blood flow direction of the target blood vessel.

[0104] In some of these embodiments, determining the slice selection gradient amplitude of the saturation band based on the interval distance between the saturation band and the imaging band and the slice selection gradient amplitude of the imaging band may include the following steps:

[0105] Step 1: In response to a user instruction, determine the slice gradient magnitude of the imaging band. Based on the slice gradient magnitude of the imaging band, determine a first offset in the imaging band. The first offset is the offset of the imaging position of the interfering base substance in the imaging band relative to the imaging position of the target base substance under the slice gradient magnitude of the imaging band.

[0106] Exemplarily, receive a user instruction that includes the slice gradient magnitude of the imaging band. Further, the electronic device determines the slice gradient magnitude of the imaging band according to the user instruction.

[0107] Further, determine the first offset in the imaging band according to the slice gradient magnitude of the imaging band.

[0108] Step 2: Based on the first offset and the spacing distance, determine a second offset in the saturation band. The second offset is the desired offset of the imaging position of the interfering base substance in the saturation band relative to the imaging position of the target base substance.

[0109] Further, determine the second offset in the saturation band according to the first offset and the spacing distance, where the second offset is the desired offset of the imaging position of the interfering base substance in the saturation band relative to the imaging position of the target base substance, and at this desired offset, the interfering base substance in the saturation band can block the interfering base substance in the imaging band.

[0110] Step 3: Determine the slice gradient magnitude of the saturation band based on the second offset.

[0111] Further, determine the slice gradient magnitude in the saturation band according to the second offset, so that at the slice gradient magnitude of the saturation band, the interfering base substance in the saturation band can block the interfering base substance in the imaging band.

[0112] In the above implementation process, according to the first offset in the imaging band and the spacing distance between the saturation band and the imaging band, determine the offset of the imaging position of the interfering base substance in the saturation band relative to the imaging position of the target base substance, that is, the second offset. Further, determine the gradient magnitude of the saturation band according to the second offset, so that at the gradient magnitude of the saturation band, the interfering base substance in the saturation band can block the interfering base substance in the imaging band.

[0113] In some of the embodiments, determining the slice gradient magnitude of the saturation band based on the second offset may include the following steps:

[0114] Step 1: Determine the resonance frequency difference between the target base substance and the interfering base substance under the main magnetic field.

[0115] Step 2: Based on the resonance frequency difference and the second offset, determine the slice gradient magnitude of the saturation band.

[0116] Exemplarily, the magnetic field strength of the main magnetic field affects the resonance frequency difference between the target base substance and the interfering base substance. When performing magnetic resonance angiography, the magnetic field strength of the main magnetic field is usually the same and fixed in the saturation band and the imaging band. Therefore, the resonance frequency difference Δf between the target base substance and the interfering base substance in the imaging band and the saturation band under the main magnetic field is also the same and fixed.

[0117] Therefore, the resonance frequency difference Δf between water and fat is determined according to the magnetic field strength of the main magnetic field.

[0118] Furthermore, based on the resonance frequency difference and the second offset, the slice selection gradient amplitude of the saturation band is determined.

[0119] Specifically, in the saturation band, the offset of the fat imaging position relative to the water imaging position, that is, the second offset Δd2, can be determined by the following formula (1):

[0120] Δd2 = Δf / (γG2) (1)

[0121] In formula (1), Δf is the resonance frequency difference between water and fat, γ is the gyromagnetic ratio, G2 is the slice selection gradient amplitude of the saturation band, and Δd2 is the offset of the fat imaging position relative to the water imaging position in the saturation band, that is, the second offset.

[0122] Therefore, the slice selection gradient amplitude G2 of the saturation band can be determined based on the resonance frequency difference and the second offset.

[0123] In the above implementation process, during magnetic resonance angiography, the resonance frequency differences between the target base substance and the interfering base substance corresponding to different magnetic field strengths of the main magnetic field are different. Therefore, according to the magnetic field strength of the main magnetic field, the resonance frequency difference between water and fat is determined. Furthermore, it is convenient to determine the slice selection gradient amplitude of the saturation band based on the resonance frequency difference and the second offset.

[0124] In some of these embodiments, determining the slice selection gradient amplitude of the saturation band based on the resonance frequency difference and the second offset may include the following steps:

[0125] Step 1: Determine the thickness of the saturation band.

[0126] Step 2: Based on the resonance frequency difference, the thickness of the saturation band, and the second offset, determine the excitation pulse bandwidth of the saturation band.

[0127] Step 3: Based on the excitation pulse bandwidth of the saturation band, determine the slice selection gradient amplitude of the saturation band.

[0128] Exemplarily, in the saturation band, the offset of the fat imaging position relative to the water imaging position, that is, the second offset Δd2, can be determined by the following formula:

[0129] Δd2 = (Δf * d2) / BW2 (2)

[0130] In formula (2), Δf is the resonance frequency difference between water and fat, d2 is the thickness of the saturation band, BW2 is the excitation pulse bandwidth of the saturation band, and Δd2 is the offset of the fat imaging position relative to the water imaging position in the saturation band, that is, the second offset.

[0131] That is, the thickness d2 of the saturation band is determined. Further, based on the thickness d2 of the saturation band, the resonance frequency difference Δf, and the second offset Δd2, the excitation pulse bandwidth BW2 of the saturation band is determined.

[0132] Further, the slice selection gradient amplitude of the saturation band is determined according to the excitation pulse bandwidth of the saturation band.

[0133] In the above implementation process, based on the resonance frequency difference, the thickness of the saturation band, and the second offset, the excitation pulse bandwidth of the saturation band is determined, which is convenient for further determining the slice selection gradient amplitude of the saturation band according to the excitation pulse bandwidth of the saturation band.

[0134] In some of these embodiments, determining the slice selection gradient amplitude of the saturation band based on the excitation pulse bandwidth of the saturation band includes: determining the slice selection gradient amplitude of the saturation band based on the excitation pulse bandwidth of the saturation band and the thickness of the saturation band.

[0135] Specifically, in the saturation band, the excitation pulse bandwidth of the saturation band can be determined according to the following formula (3):

[0136] BW2 = γG2 * d2 (3)

[0137] In formula (3), BW2 is the excitation pulse bandwidth of the saturation band, γ is the gyromagnetic ratio, and G2 is the slice selection gradient amplitude of the saturation band.

[0138] Therefore, according to formula (3), it can be known that the slice selection gradient amplitude G2 of the saturation band can be determined according to the excitation pulse bandwidth of the saturation band, the thickness of the saturation band, and the gyromagnetic ratio. Specifically, since the gyromagnetic ratio γ is a constant, the slice selection gradient amplitude G2 of the saturation band can be determined according to the excitation pulse bandwidth of the saturation band and the thickness of the saturation band.

[0139] In the above implementation process, the slice selection gradient amplitude of the saturation band can be accurately determined according to the excitation pulse bandwidth of the saturation band and the thickness of the saturation band. Thus, at the slice selection gradient amplitude of the saturation band, the fat imaging position in the saturation band can block the imaging positions of some fat in the imaging band, thereby reducing the fat signal in the target blood vessel image.

[0140] In some of these embodiments, determining the slice selection gradient amplitude of the imaging band based on the interval distance between the saturation band and the imaging band and the slice selection degree amplitude of the saturation band may include the following steps:

[0141] Step 1: In response to a user instruction, determine the slice selection gradient magnitude of the saturation band. Based on the slice selection gradient magnitude of the saturation band, determine a second offset in the saturation band. The second offset is the offset of the imaging position of the interfering base substance in the saturation band relative to the imaging position of the target base substance at the slice selection gradient magnitude of the saturation band.

[0142] Exemplarily, receive a user instruction that includes the slice selection gradient magnitude of the saturation band. Further, the electronic device determines the slice selection gradient magnitude of the saturation band according to the user instruction.

[0143] Further, determine the second offset in the saturation band according to the slice selection gradient magnitude of the saturation band.

[0144] Step 2: Based on the second offset and the interval distance, determine a first offset in the imaging band. The first offset is the desired offset of the imaging position of the interfering base substance in the imaging band relative to the imaging position of the target base substance.

[0145] Further, determine the first offset in the imaging band according to the second offset and the interval distance, where the first offset is the desired offset of the imaging position of the interfering base substance in the imaging band relative to the imaging position of the target base substance, and at this desired offset, the interfering base substance in the saturation band can block the interfering base substance in the imaging band.

[0146] Step 3: Determine the slice selection gradient magnitude of the imaging band based on the first offset.

[0147] Further, determine the slice selection gradient magnitude in the imaging band according to the first offset, so that at the slice selection gradient magnitude of the imaging band, the interfering base substance in the imaging band can be partially or completely blocked by the interfering base substance in the saturation band.

[0148] In the above implementation process, according to the second offset in the saturation band and the interval distance between the saturation band and the imaging band, determine the offset of the imaging position of the interfering base substance in the imaging band relative to the imaging position of the target base substance, that is, the first offset. Further, determine the gradient magnitude of the imaging band according to the first offset, so that at the gradient magnitude of the imaging band, the interfering base substance in the imaging band can be partially or completely blocked by the interfering base substance in the saturation band.

[0149] In some of the embodiments, determining the slice selection gradient magnitude of the imaging band based on the first offset includes:

[0150] Step 1: Determine the resonance frequency difference between the target base substance and the interfering base substance under the main magnetic field.

[0151] Step 2: Based on the resonance frequency difference and the first offset, determine the slice selection gradient magnitude of the imaging band.

[0152] Similarly, the magnetic field strength of the main magnetic field affects the resonance frequency difference between the target base substance and the interfering base substance. When performing magnetic resonance angiography, the magnetic field strength of the main magnetic field is usually the same and fixed in the saturation band and the imaging band. Therefore, the resonance frequency difference Δf between the target base substance and the interfering base substance in the imaging band and the saturation band under the main magnetic field is also the same and fixed.

[0153] Therefore, the resonance frequency difference Δf between water and fat is determined according to the magnetic field strength of the main magnetic field.

[0154] Furthermore, according to the resonance frequency difference and the first offset, the slice selection gradient amplitude of the imaging band is determined.

[0155] Specifically, in the imaging band, the offset of the fat imaging position relative to the water imaging position, that is, the first offset, can be determined by the following formula (1):

[0156] Δd1 = Δf / (γG1) (4)

[0157] In formula (4), Δf is the resonance frequency difference between water and fat, γ is the gyromagnetic ratio, G1 is the slice selection gradient amplitude of the imaging band, and Δd1 is the offset of the fat imaging position relative to the water imaging position in the imaging band, that is, the first offset.

[0158] Therefore, the slice selection gradient amplitude G1 of the saturation band can be determined according to the resonance frequency difference and the first offset.

[0159] In the above implementation process, during magnetic resonance angiography, the resonance frequency differences between the target base substance and the interfering base substance corresponding to different magnetic field strengths of the main magnetic field are different. Therefore, according to the magnetic field strength of the main magnetic field, the resonance frequency difference between water and fat is determined. Furthermore, it is convenient to determine the slice selection gradient amplitude of the imaging band according to the resonance frequency difference and the first offset.

[0160] In some of these embodiments, determining the slice selection gradient amplitude of the imaging band based on the resonance frequency difference and the first offset includes:

[0161] Step 1: Determine the thickness of the imaging band.

[0162] Step 2: Based on the resonance frequency difference, the thickness of the imaging band, and the first offset, determine the excitation pulse bandwidth of the imaging band.

[0163] Step 3: Based on the excitation pulse bandwidth of the imaging band, determine the slice selection gradient amplitude of the imaging band.

[0164] Similar to the above formula (1), in the imaging band, the offset Δd1 of the fat imaging position relative to the water imaging position can be determined by the following formula:

[0165] Δd1 = (Δf * d1) / BW1 (5)

[0166] In formula (5), Δf is the resonance frequency difference between water and fat, d1 is the thickness of the imaging band, BW1 is the excitation pulse bandwidth of the imaging band, and Δd1 is the offset of the fat imaging position relative to the water imaging position in the imaging band, that is, the first offset.

[0167] That is, the thickness d1 of the saturation band is determined. Further, based on the thickness d1 of the imaging band, the resonance frequency difference Δf, and the first offset Δd1, the excitation pulse bandwidth BW1 of the imaging band is determined.

[0168] Further, the slice selection gradient amplitude of the imaging band is determined according to the excitation pulse bandwidth of the imaging band.

[0169] In the above implementation process, based on the resonance frequency difference, the thickness of the imaging band, and the first offset, the excitation pulse bandwidth of the imaging band is determined, which is convenient for further determining the slice selection gradient amplitude of the imaging band according to the excitation pulse bandwidth of the imaging band.

[0170] In some of these embodiments, determining the slice selection gradient amplitude of the imaging band based on the excitation pulse bandwidth of the imaging band includes: determining the slice selection gradient amplitude of the imaging band based on the excitation pulse bandwidth of the imaging band and the thickness of the imaging band.

[0171] Specifically, similar to the above formula (3), in the imaging band, the excitation pulse bandwidth BW1 of the imaging band can be determined by the following formula (6):

[0172] BW1 = γG1 * d1 (6)

[0173] Wherein, BW1 is the excitation pulse bandwidth of the imaging band, γ is the gyromagnetic ratio, G1 is the slice selection gradient amplitude of the imaging band, and d1 is the thickness of the imaging band.

[0174] Therefore, the slice selection gradient amplitude G1 of the imaging band can be determined according to the excitation pulse bandwidth of the imaging band, the thickness of the imaging band, and the gyromagnetic ratio. Specifically, since the gyromagnetic ratio γ is a constant, the slice selection gradient amplitude G1 of the imaging band can be determined according to the excitation pulse bandwidth of the imaging band and the thickness of the imaging band.

[0175] In the above implementation process, the slice selection gradient amplitude of the imaging band can be accurately determined according to the excitation pulse bandwidth of the imaging band and the thickness of the imaging band. Thus, at the slice selection gradient amplitude of the imaging band, the fat imaging position in the imaging band can be blocked by the imaging positions of some fat in the saturation band, thereby reducing the fat signal in the target blood vessel image.

[0176] In some of these embodiments, the sum of the first offset and the second offset is greater than the spacing distance between the saturation band and the imaging band.

[0177] Exemplarily, in order to enable the fat in the saturation band to block the fat in the imaging band, it is only necessary to ensure that the sum of the offset of the fat imaging position in the imaging band relative to the water imaging position, i.e., the first offset Δd1, and the offset of the fat imaging position in the saturation band relative to the water imaging position, i.e., the second offset Δd2, is greater than the distance H between the saturation band and the imaging band, that is, (Δd1 + Δd2) > H.

[0178] In the above implementation process, making the sum of the first offset and the second offset greater than the distance between the saturation band and the imaging band can achieve that the fat imaging position in the saturation band blocks the imaging position of the fat in the imaging band, thereby reducing the fat signal in the target vessel image.

[0179] Exemplarily, Figure 4 is a schematic diagram of the imaging positions of water and fat in the imaging band under the positive selected layer gradient polarity provided by an embodiment of the present application. Figure 4 The imaging positions of water and fat in the saturation band are not shown. In the coordinate system shown in Figure 4 , the abscissa is frequency and the ordinate is excitation thickness. The saturation band is above the imaging band. When the imaging magnetic field polarity is positive, the fat imaging position under the positive selected layer gradient polarity is below the water imaging position, and the fat imaging position under the positive selected layer gradient polarity is far from the saturation band position.

[0180] After determining the relative positions of the saturation band and the imaging band, and the resonance frequency difference between water and fat in the imaging band, in order to shift the fat imaging position in the imaging band towards the saturation band, the selected layer gradient polarity of the imaging band can be changed to negative to move the fat imaging position towards the saturation band. At the same time, ensure that the selected layer gradient polarity of the saturation band is positive to shift the fat signal position suppressed by the saturation band towards the imaging band, so that part or all of the fat is saturated by the saturation band, thereby reducing the fat signal in the target vessel image.

[0181] In Figure 4 On this basis, after changing the selected layer gradient polarity of the imaging band, make the selected layer gradient polarity of the imaging band negative to obtain Figure 5 the schematic diagram of the imaging positions of water and fat shown, Figure 5 which is a schematic diagram of the imaging positions of water and fat in the imaging band under the negative selected layer gradient polarity provided by an embodiment of the present application. As shown in Figure 5 , the fat imaging position under the negative selected layer gradient polarity is within the range of the saturation band position. At the same time, ensure that the selected layer gradient polarity of the saturation band is positive to shift the fat signal position suppressed by the saturation band towards the imaging layer, so that the saturation band saturates part of the fat in the imaging band, reducing the artifacts in the target image.

[0182] Therefore, during magnetic resonance angiography, only the slice selection gradient polarity of the imaging band needs to be adjusted to shift the fat position in the imaging band towards the saturation band, so that the saturation band saturates part of the fat in the imaging band, thereby reducing the chemical artifacts caused by the resonance frequency difference between water and fat. Compared with the prior art method of continuously increasing the excitation bandwidth to reduce artifacts, the imaging efficiency of magnetic resonance angiography is improved. Moreover, by saturating the fat with the saturation band, the influence of fat imaging in the imaging band is reduced, rather than simply changing the direction of fat imaging, effectively reducing the area of artifacts.

[0183] It should be noted that the steps shown in the above process or the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions. And although the logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in a different order than here.

[0184] In this embodiment, a magnetic resonance angiography device is also provided. This device is used to implement the above-mentioned embodiments and preferred implementation manners, and those that have been described will not be repeated here. The following terms such as "module", "unit", "sub-unit", etc. can be a combination of software and / or hardware that can achieve a predetermined function. Although the devices described in the following embodiments are preferably implemented in software, implementation in hardware, or a combination of software and hardware is also possible and contemplated.

[0185] Figure 6 is a structural block diagram of a magnetic resonance angiography device provided by an embodiment of the present application. As Figure 6 shown, the device includes:

[0186] A first determination module 601, configured to determine the relative position between the saturation band and the imaging band according to the blood flow direction of the target blood vessel, where the saturation band is used to suppress the blood imaging of non-target blood vessels;

[0187] A second determination module 602, configured to determine the slice selection gradient polarities of the saturation band and the imaging band based on the relative position, and the resonance frequency magnitudes of the target base substance and the interfering base substance;

[0188] A third determination module 603, configured to determine the slice selection gradient magnitude of the saturation band based on the interval distance between the saturation band and the imaging band and the slice selection gradient magnitude of the imaging band;

[0189] Or configured to determine the slice selection gradient magnitude of the imaging band based on the interval distance between the saturation band and the imaging band and the slice selection gradient magnitude of the saturation band;

[0190] An imaging module 604, configured to scan the target blood vessel based on the slice selection gradient polarities of the saturation band and the imaging band and the slice selection gradient magnitudes of the saturation band and the imaging band, and generate a target blood vessel image.

[0191] In some of these embodiments, the first determination module 601 is further configured to:

[0192] In response to a user instruction, determine a target blood vessel, where the target blood vessel is a venous blood vessel or an arterial blood vessel.

[0193] In some of these embodiments, the third determination module 603 is specifically configured to:

[0194] In response to a user instruction, determine the slice selection gradient amplitude of the imaging band, and based on the slice selection gradient amplitude of the imaging band, determine a first offset in the imaging band, where the first offset is the offset of the imaging position of the interfering base substance in the imaging band relative to the imaging position of the target base substance at the slice selection gradient amplitude of the imaging band;

[0195] Based on the first offset and the interval distance, determine a second offset in the saturation band, where the second offset is the desired offset of the imaging position of the interfering base substance in the saturation band relative to the imaging position of the target base substance;

[0196] Based on the second offset, determine the slice selection gradient amplitude of the saturation band.

[0197] In some of these embodiments, the third determination module 603 is specifically configured to:

[0198] Determine the resonance frequency difference between the target base substance and the interfering base substance under the main magnetic field;

[0199] Based on the resonance frequency difference and the second offset, determine the slice selection gradient amplitude of the saturation band.

[0200] In some of these embodiments, the third determination module 603 is specifically configured to:

[0201] Determine the thickness of the saturation band;

[0202] Based on the resonance frequency difference, the thickness of the saturation band, and the second offset, determine the excitation pulse bandwidth of the saturation band;

[0203] Based on the excitation pulse bandwidth of the saturation band, determine the slice selection gradient amplitude of the saturation band.

[0204] In some of these embodiments, the third determination module 603 is specifically configured to:

[0205] Based on the excitation pulse bandwidth of the saturation band and the thickness of the saturation band, determine the slice selection gradient amplitude of the saturation band.

[0206] In some of these embodiments, the third determination module 603 is configured to:

[0207] In response to a user instruction, determine the slice selection gradient amplitude of the saturation band, and based on the slice selection gradient amplitude of the saturation band, determine a second offset in the saturation band, where the second offset is the offset of the imaging position of the interfering base substance in the saturation band relative to the imaging position of the target base substance at the slice selection gradient amplitude of the saturation band;

[0208] Based on the second offset and the interval distance, determine a first offset in the imaging band, where the first offset is the desired offset of the imaging position of the interfering base substance in the imaging band relative to the imaging position of the target base substance;

[0209] Based on the first offset, determine the slice selection gradient amplitude of the imaging band.

[0210] In some embodiments, the third determination module 603 is specifically configured to:

[0211] Based on the first offset, determine the slice selection gradient amplitude of the imaging band, including:

[0212] Determine the resonance frequency difference between the target base substance and the interfering base substance in the main magnetic field;

[0213] Based on the resonance frequency difference and the first offset, determine the slice selection gradient amplitude of the imaging band.

[0214] In some embodiments, the third determination module 603 is specifically configured to:

[0215] Determine the thickness of the imaging band;

[0216] Based on the resonance frequency difference, the thickness of the imaging band, and the first offset, determine the excitation pulse bandwidth of the imaging band;

[0217] Based on the excitation pulse bandwidth of the imaging band, determine the slice selection gradient amplitude of the imaging band.

[0218] In some embodiments, the third determination module 603 is specifically configured to:

[0219] Based on the excitation pulse bandwidth of the imaging band, determine the slice selection gradient amplitude of the imaging band, including:

[0220] Based on the excitation pulse bandwidth of the imaging band and the thickness of the imaging band, determine the slice selection gradient amplitude of the imaging band.

[0221] In some embodiments, the sum of the first offset and the second offset is greater than the interval distance between the saturation band and the imaging band.

[0222] It should be noted that the above-mentioned various modules can be functional modules or program modules, and can be implemented either by software or by hardware. For the modules implemented by hardware, the above-mentioned various modules can be located in the same processor; or the above-mentioned various modules can also be located in different processors in any combined form.

[0223] In this embodiment, an electronic device is further provided, including a memory and a processor. A computer program is stored in the memory, and the processor is configured to run the computer program to execute the steps in any one of the above method embodiments.

[0224] Optionally, the above-mentioned electronic device may further include a transmission device and an input / output device. Among them, the transmission device is connected to the above-mentioned processor, and the input / output device is connected to the above-mentioned processor.

[0225] Optionally, in this embodiment, the above-mentioned processor may be configured to execute the following steps through a computer program:

[0226] S1. Determine the relative position between the saturation band and the imaging band according to the blood flow direction of the target blood vessel. The saturation band is used to suppress the blood imaging of non-target blood vessels.

[0227] S2. Based on the relative position, as well as the resonance frequency magnitudes of the target basis substance and the interfering basis substance, determine the slice selection gradient polarities of the saturation band and the imaging band.

[0228] S3. Based on the interval distance between the saturation band and the imaging band and the slice selection gradient amplitude of the imaging band, determine the slice selection gradient amplitude of the saturation band, or based on the interval distance between the saturation band and the imaging band before and the slice selection degree amplitude of the saturation band, determine the slice selection gradient amplitude of the imaging band.

[0229] S4. Scan the target blood vessel based on the slice selection gradient polarities of the saturation band and the imaging band and the slice selection gradient amplitudes of the saturation band and the imaging band, and generate a target blood vessel image.

[0230] It should be noted that the specific examples in this embodiment can refer to the examples described in the above embodiment and the optional implementation manners, and will not be elaborated in this embodiment.

[0231] In addition, in combination with the magnetic resonance angiography method provided in the above embodiment, a storage medium can also be provided to implement it in this embodiment. A computer program is stored on the storage medium; when the computer program is executed by a processor, any one of the magnetic resonance angiography methods in the above embodiment is implemented.

[0232] It should be understood that the specific embodiments described herein are only used to explain this application and not to limit it. All other embodiments obtained by those of ordinary skill in the art without creative efforts according to the embodiments provided in this application fall within the protection scope of this application.

[0233] Obviously, the accompanying drawings are only some examples or embodiments of this application. For those of ordinary skill in the art, this application can also be applied to other similar situations based on these drawings without creative efforts. Additionally, it can be understood that although the work done during this development process may be complex and time-consuming, for those of ordinary skill in the art, certain design, manufacturing, or production changes based on the technical content disclosed in this application are only conventional technical means and should not be regarded as insufficient disclosure of this application.

[0234] The term "embodiment" in this application means that the specific features, structures, or characteristics described in connection with the embodiments may be included in at least one embodiment of this application. The phrase appears in various positions in the specification and does not necessarily mean the same embodiment, nor does it mean being independent or alternative to other embodiments and mutually exclusive. Those of ordinary skill in the art can clearly or implicitly understand that the embodiments described in this application can be combined with other embodiments without conflict.

[0235] The above-described embodiments only represent several implementation manners of this application, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of patent protection. It should be noted that for those of ordinary skill in the art, without departing from the concept of this application, several modifications and improvements can still be made, and these all fall within the protection scope of this application. Therefore, the protection scope of this application should be subject to the appended claims.

Claims

1. A magnetic resonance angiography method, characterized in that, the method includes: determining the relative position between the saturation band and the imaging band according to the blood flow direction of the target blood vessel, where the saturation band is used to suppress the blood imaging of non-target blood vessels; determining the slice selection gradient polarities of the saturation band and the imaging band based on the relative position, and the resonance frequency magnitudes of the target base substance and the interfering base substance; determining the slice selection gradient magnitude of the saturation band based on the interval distance between the saturation band and the imaging band and the slice selection gradient magnitude of the imaging band; or determining the slice selection gradient magnitude of the imaging band based on the interval distance between the saturation band and the imaging band and the slice selection gradient magnitude of the saturation band; scanning the target blood vessel based on the slice selection gradient polarities of the saturation band and the imaging band and the slice selection gradient magnitudes of the saturation band and the imaging band, and generating a target blood vessel image.

2. The method according to claim 1, characterized in that, before determining the relative position between the saturation band and the imaging band according to the blood flow direction of the target blood vessel, it includes: responding to a user instruction to determine the target blood vessel, where the target blood vessel is a venous blood vessel or an arterial blood vessel.

3. The method according to claim 1, characterized in that, determining the slice selection gradient magnitude of the saturation band based on the interval distance between the saturation band and the imaging band and the slice selection gradient magnitude of the imaging band includes: responding to a user instruction to determine the slice selection gradient magnitude of the imaging band, and based on the slice selection gradient magnitude of the imaging band, determining a first offset in the imaging band, where the first offset is the offset of the imaging position of the interfering base substance relative to the imaging position of the target base substance in the imaging band under the slice selection gradient magnitude of the imaging band; determining a second offset in the saturation band based on the first offset and the interval distance, where the second offset is the desired offset of the imaging position of the interfering base substance relative to the imaging position of the target base substance in the saturation band; determining the slice selection gradient magnitude of the saturation band based on the second offset.

4. The method according to claim 3, characterized in that, determining the slice selection gradient magnitude of the saturation band based on the second offset includes: determining the resonance frequency difference between the target base substance and the interfering base substance under the main magnetic field; determining the slice selection gradient magnitude of the saturation band based on the resonance frequency difference and the second offset.

5. The method according to claim 4, characterized in that, determining the slice selection gradient magnitude of the saturation band based on the resonance frequency difference and the second offset includes: determining the thickness of the saturation band; determining the excitation pulse bandwidth of the saturation band based on the resonance frequency difference, the thickness of the saturation band, and the second offset; determining the slice selection gradient magnitude of the saturation band based on the excitation pulse bandwidth of the saturation band.

6. The method according to claim 5, characterized in that, determining the slice selection gradient magnitude of the saturation band based on the excitation pulse bandwidth of the saturation band includes: Determine the slice selection gradient amplitude of the saturation band based on the excitation pulse bandwidth of the saturation band and the thickness of the saturation band.

7. The method according to claim 1, wherein, the determining the slice selection gradient amplitude of the imaging band based on the distance between the saturation band and the imaging band and the slice selection gradient amplitude of the saturation band includes: in response to a user instruction, determine the slice selection gradient amplitude of the saturation band, and based on the slice selection gradient amplitude of the saturation band, determine a second offset in the saturation band, where the second offset is the offset of the imaging position of the interfering base substance in the saturation band relative to the imaging position of the target base substance under the slice selection gradient amplitude of the saturation band; based on the second offset and the distance between the intervals, determine a first offset in the imaging band, where the first offset is the desired offset of the imaging position of the interfering base substance in the imaging band relative to the imaging position of the target base substance; determine the slice selection gradient amplitude of the imaging band based on the first offset.

8. The method according to claim 7, wherein, the determining the slice selection gradient amplitude of the imaging band based on the first offset includes: determine the resonance frequency difference between the target base substance and the interfering base substance under the main magnetic field; determine the slice selection gradient amplitude of the imaging band based on the resonance frequency difference and the first offset.

9. The method according to claim 8, wherein, the determining the slice selection gradient amplitude of the imaging band based on the resonance frequency difference and the first offset includes: determine the thickness of the imaging band; based on the resonance frequency difference, the thickness of the imaging band, and the first offset, determine the excitation pulse bandwidth of the imaging band; determine the slice selection gradient amplitude of the imaging band based on the excitation pulse bandwidth of the imaging band.

10. The method according to claim 9, wherein, the determining the slice selection gradient amplitude of the imaging band based on the excitation pulse bandwidth of the imaging band includes: determine the slice selection gradient amplitude of the imaging band based on the excitation pulse bandwidth of the imaging band and the thickness of the imaging band.

11. The method according to any one of claims 3-10, wherein, the sum of the first offset and the second offset is greater than the distance between the saturation band and the imaging band.

12. A magnetic resonance angiography device, wherein, comprises: a first determination module, configured to determine the relative position between the saturation band and the imaging band according to the blood flow direction of the target blood vessel, where the saturation band is used to suppress the blood imaging of non-target blood vessels; a second determination module, configured to determine the slice selection gradient polarities of the saturation band and the imaging band based on the relative position, and the resonance frequency magnitudes of the target base substance and the interfering base substance; a third determination module, configured to determine the slice selection gradient amplitude of the saturation band based on the distance between the saturation band and the imaging band and the slice selection gradient amplitude of the imaging band; or used to determine the slice selection gradient amplitude of the imaging band based on the interval distance between the saturation band and the imaging band and the slice selection degree amplitude of the saturation band; An imaging module, configured to scan the target blood vessel based on the slice selection gradient polarities of the saturation band and the imaging band and the slice selection gradient amplitudes of the saturation band and the imaging band, and generate a target blood vessel image.

13. An electronic device, comprising a memory and a processor, wherein, a computer program is stored in the memory, and the processor is configured to run the computer program to execute the magnetic resonance angiography method according to any one of claims 1 to 11.

14. A computer-readable storage medium, on which a computer program is stored, wherein, when the computer program is executed by a processor, the steps of the magnetic resonance angiography method according to any one of claims 1 to 11 are implemented.

Images