CN113303781A - Gating synchronous magnetic resonance SAR value monitoring method, device, storage medium and system - Google Patents
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Abstract
The application relates to a method, a device, a storage medium and a system for monitoring a gating synchronous magnetic resonance SAR value, which relate to the technical field of magnetic resonance and comprise the following steps: acquiring current scanning information and current SAR value parameter information; searching current sequence information from a sequence database according to the current scanning information; loading and executing the current sequence information by a spectrometer to output radio frequency pulses to a radio frequency link and output control information to a radio frequency power amplifier; acquiring current SAR value acquisition information from a radio frequency link; acquiring a gating signal from the control information, and extracting current SAR value acquisition information if the gating signal is a high-level signal; and acquiring information according to the current SAR value corresponding to the high level to participate in calculation. The SAR value monitoring method has the advantages that the burden of the SAR value calculation module is reduced, and SAR value monitoring is carried out more efficiently and accurately; the collection rate and the collection precision in the radio frequency emission interval are improved, and the pulse energy of the radio frequency waveform is collected more accurately.
Description
Technical Field
The present application relates to the field of magnetic resonance system technologies, and in particular, to a method, an apparatus, a storage medium, and a system for monitoring a gated synchronous magnetic resonance SAR value.
Background
The magnetic resonance system is a very complex medical imaging system, and in recent years, with the continuous development of the magnetic resonance imaging technology, the main magnetic field has been continuously increased from 0.2 to 3T or even 9.4T, and the like, and a multi-channel radio frequency system has also been developed.
The power of the radio frequency pulse is increased due to the increase of the field intensity and the increase of the channel, so that the energy absorbed by a human body is larger and more unevenly distributed, the body temperature is increased, and even the conditions of local burn, heart rate acceleration and the like can occur. Therefore, this problem needs to be monitored and SAR values are used internationally to define corresponding safety standards for the amount of rf energy absorbed per body weight per unit time.
In the related art, as disclosed in publication No. CN107440718B, a method for determining an SAR value in magnetic resonance imaging is disclosed, which includes: placing a detected person in a scanning bed, moving the detected person to a scanning area, acquiring the mass of a body part in the scanning area, and acquiring the specific gravity r of the radio frequency absorption power of the body part in the forward radio frequency power; exciting a body part in a scanning area by adopting an imaging sequence at the time t1, and acquiring forward radio frequency power corresponding to the imaging sequence from the time t1 to the time tx, wherein tx is greater than t 1; calculating the radio frequency absorption power of the body part at the time from t1 to tx according to the specific gravity r and the forward radio frequency power corresponding to the imaging sequence at the time from t1 to tx, wherein t1< tx is less than or equal to tn, and tn represents the scanning completion time of the imaging sequence; and determining the SAR value according to the radio frequency absorption power and the body part mass of the body part from t1 to tx. The invention can effectively monitor the specific radio frequency absorption rate of the imaging area.
In view of the above-mentioned related technologies, the inventor believes that the SAR value monitoring collects all data in real time, and directly calculates the data on the collection module or transmits the related data to the scanning computer for calculation, and the obtained total SAR value and local SAR value are compared with the internationally established standard threshold value to suspend or stop the execution of the magnetic resonance sequence, thereby avoiding further damage to the patient.
According to the magnetic resonance scanning principle, a scanning computer controls discontinuous output of radio frequency pulses through a spectrometer, the radio frequency pulses do not exist all the time in the sequence scanning process, and related data can be calculated and processed in the period without the radio frequency pulses, so that the burden of an SAR value calculating module is increased, and the space for improvement is provided.
Disclosure of Invention
In order to reduce the burden of an SAR value calculation module and more efficiently and accurately monitor the SAR value, the application provides a gating synchronous magnetic resonance SAR value monitoring method, device, storage medium and system.
In a first aspect, the application provides a gating synchronous magnetic resonance SAR value monitoring method, which adopts the following technical scheme:
a gating synchronous magnetic resonance SAR value monitoring method comprises the following steps:
acquiring current scanning information of a current examinee and current SAR value parameter information of current equipment;
searching current sequence information from a sequence database preset in a scanning computer according to the current scanning information;
loading and executing the current sequence information by a spectrometer to output radio frequency pulses to a radio frequency link and output control information to a radio frequency power amplifier;
acquiring current SAR value acquisition information in real time from a radio frequency link;
collecting a gating signal from the control information, wherein the gating signal comprises a high level signal and a low level signal;
if the gating signal is a high-level signal, extracting current SAR value acquisition information;
if the gating signal is a low-level signal, extracting no current SAR value acquisition information;
and acquiring information according to the current SAR value corresponding to the high level to participate in calculation.
By adopting the technical scheme, the height, the weight and other information of the examinee can be known by acquiring the current scanning information of the examinee, and the current SAR value parameter information of the current equipment can be acquired. Sequence information is searched from a sequence database through scanning information and is loaded by a spectrometer, current SAR value acquisition information is acquired from a radio frequency link, gating information is acquired from control information synchronously to calculate the SAR value, the burden of an SAR value calculation module is reduced, and SAR value monitoring is carried out more efficiently and accurately.
Optionally, the current SAR value parameter information includes quality parameter information and coil loss information; the method for acquiring the quality parameter information and the coil loss information comprises the following steps:
obtaining current quality parameter information from a preset quality parameter database according to human body detection information in the current scanning information;
and obtaining current coil loss information from a preset magnetic resonance parameter library according to the scanning part in the current scanning information.
By adopting the technical scheme, the current quality parameter information is obtained by detecting the human body information in the current scanning information, and the scanning position is synchronously known, so that the current coil loss information is obtained.
Optionally, the SAR value information includes whole-body SAR value information and local SAR value information; the method for acquiring the local SAR value information and the whole-body SAR value information comprises the following steps:
acquiring a whole-body quality parameter of an SAR value, a local quality parameter of the SAR value and total absorbed average power of a detected person;
defining:
the subject's overall SAR value is SARAll-purpose；
The local SAR value of the subject is SAROffice；
SAR value the whole body mass parameter is WAll-in-one；
The local quality parameter of SAR value is WLocal mass；
Total average power absorbed by the subject is PFlat subject；
SARAll-purpose=PFlat subject/WAll-in-one；
SAROffice=PFlat subject/WLocal mass。
By adopting the technical scheme, the SAR value whole body quality parameter, the SAR value local quality parameter and the total absorption average power of the examined person are obtained, so that the whole body SAR value information and the local SAR value information are calculated.
Optionally, the method for calculating the total average absorbed power of the subject includes:
acquiring the absorption instantaneous power and sampling time of a detected person;
defining:
total average power absorbed by the subject is PFlat subject；
Sampling time information is TMining；
Reference time information is TBase of；
PFlat subject=∑(PInhaling the examinee*TMining)/TBase of。
By adopting the technical scheme, the absorption instantaneous power and the sampling time of the examinee are acquired, so that the total absorption average power of the examinee is calculated through a formula, and the later-stage calculation is facilitated.
Optionally, the method for calculating the instantaneous power absorbed by the subject includes:
acquiring real monitoring instantaneous total power of two sampling rings when the two sampling rings are loaded, instantaneous total power of a double-channel transmitting coil and a ratio of coil loss instantaneous power to power on the sampling rings;
defining:
the absorption instantaneous power of the subject is PInhaling the examinee；
The real monitoring instantaneous total power when two sampling rings are loaded is PCarrier ring assembly；
The instantaneous total power of the double-channel transmitting coil is PCarrier assembly；
The ratio of the coil loss instantaneous power to the power on the sampling loop is K;
Pinhaling the examinee=PCarrier assembly-K*PCarrier ring assembly。
By adopting the technical scheme, the real monitoring instantaneous total power when the two sampling rings are loaded, the instantaneous total power of the double-channel transmitting coil and the ratio of the coil loss instantaneous power to the power on the sampling rings are obtained, so that the absorption instantaneous power of the detected person is calculated, and the later calculation is facilitated.
Optionally, the method for calculating the instantaneous total power of the dual-channel transmitting coil includes:
acquiring real forward radio frequency instantaneous power when a first channel is loaded, real reverse radio frequency instantaneous power when the first channel is loaded, real forward radio frequency instantaneous power when a second channel is loaded and real reverse radio frequency instantaneous power when the second channel is loaded;
defining:
the real forward radio frequency instantaneous power when the first channel is loaded is PBefore loading 1；
The real reverse radio frequency instantaneous power when the first channel is loaded is P1 load reverse；
The real forward radio frequency instantaneous power when the second channel is loaded is PBefore 2 loads；
The real reverse radio frequency instantaneous power when the second channel is loaded is P2 load reversal；
PCarrier assembly=（PBefore loading 1-P1 load reverse）+（PBefore 2 loads-P2 load reversal）；
The method for calculating the real monitoring instantaneous total power when two sampling rings are loaded comprises the following steps:
acquiring real monitoring instantaneous power when a first sampling ring is loaded and real monitoring instantaneous power when a second sampling ring is loaded;
defining:
the real monitoring instantaneous power when the first sampling ring is loaded is PCarrier ring 1；
The real monitored instantaneous power when the second sampling ring is loaded is PCarrier ring 2；
PCarrier ring assembly=PCarrier ring 1+PCarrier ring 2；
The ratio K of the coil loss instantaneous power to the power on the sampling ring is a preset parameter, and the acquisition method comprises the following steps:
acquiring real monitoring peak power of a first sampling ring in no-load, real monitoring peak power of a second sampling ring in no-load and peak loss power of a no-load coil;
defining:
the real monitoring peak power when the first sampling loop is in no load is PEmpty ring 1；
The real monitoring peak power when the second sampling loop is in no load is PEmpty ring 2；
Peak power loss of no-load coil is PAir bus；
K=PAir bus/(PEmpty ring 1+PEmpty ring 2)。
By adopting the technical scheme, the real monitoring instantaneous total power of the two sampling rings in the load state is calculated, so that the conditions of the two sampling rings in the load state are calculated, the subsequent calculation of the loss condition of the coil is facilitated, and the practicability is high.
Optionally, the method for calculating the peak loss power of the coil during no-load includes:
acquiring real forward radio frequency peak power of a first channel in no-load, real reverse radio frequency peak power of the first channel in no-load, real forward radio frequency peak power of a second channel in no-load and real reverse radio frequency peak power of the second channel in no-load;
defining:
the real forward RF peak power of the first channel in no-load is P1 unprecedented；
The real reverse RF peak power of the first channel in no-load is P1 air reaction；
The real forward RF peak power of the second channel in no-load is P2 space ahead；
The real reverse RF peak power of the second channel in no load is P2 air reaction；
PAir bus=（P1 unprecedented-P1 air reaction）+（P2 space ahead-P2 air reaction）。
By adopting the technical scheme, the ratio K of the coil loss instantaneous power to the power on the sampling ring can be obtained, so that the coil loss instantaneous power in the later period can be conveniently calculated, and the absorption instantaneous total power of the detected person can be accurately calculated; when the coil is in no-load, the radio frequency output power is completely absorbed by the coil, and the peak power loss of the coil in no-load is obtained by obtaining the total power of the forward peak and the reverse peak of the two channels in no-load.
In a second aspect, the application provides a gated synchronous magnetic resonance SAR value monitoring device, which adopts the following technical scheme:
a gated synchronous magnetic resonance SAR value monitoring apparatus, comprising:
the acquisition module is used for acquiring current scanning information of a current examinee and current SAR value parameter information of current equipment;
the searching module is used for searching current sequence information from a sequence database preset in the scanning computer according to the current scanning information;
the acquisition module is used for loading and executing the current sequence information by the spectrometer to output radio frequency pulses to the radio frequency link and output control information to the radio frequency power amplifier; acquiring current SAR value acquisition information from a radio frequency link, and acquiring a gating signal from control information, wherein the gating signal comprises a high level signal and a low level signal;
the processing module is connected with the acquisition module, the searching module and the acquisition module and is used for processing and storing information;
if the gating signal is a high-level signal, extracting current SAR value acquisition information; if the gating signal is a low-level signal, extracting no current SAR value acquisition information; and acquiring information according to the current SAR value corresponding to the high level to participate in calculation.
By adopting the technical scheme, the height, the weight and other information of the examinee can be known by acquiring the current scanning information of the examinee, and the current SAR value parameter information of the current equipment can be acquired. Sequence information is searched from a sequence database through scanning information and is loaded by a spectrometer, current SAR value acquisition information is acquired from a radio frequency link, gating information is acquired from control information synchronously to calculate the SAR value, the burden of an SAR value calculation module is reduced, and SAR value monitoring is carried out more efficiently and accurately.
In a third aspect, the present application provides a computer-readable storage medium, which adopts the following technical solutions:
a computer-readable storage medium storing a computer program that can be loaded by a processor and executes the above-mentioned method.
By adopting the technical scheme, the height, the weight and other information of the examinee can be known by acquiring the current scanning information of the examinee, and the current SAR value parameter information of the current equipment can be acquired. Sequence information is searched from a sequence database through scanning information and is loaded by a spectrometer, current SAR value acquisition information is acquired from a radio frequency link, gating information is acquired from control information synchronously to calculate the SAR value, the burden of an SAR value calculation module is reduced, and SAR value monitoring is carried out more efficiently and accurately.
In a fourth aspect, the present application provides a computer storage medium, which can store a corresponding program, and has the characteristics of facilitating the implementation of reducing the burden of an SAR value calculation module, and performing SAR value monitoring more efficiently and accurately, and adopts the following technical scheme:
a gated synchronized magnetic resonance SAR value monitoring system comprising a memory and a processor, the memory having stored thereon a computer program which can be loaded by the processor and which performs the method as described above.
By adopting the technical scheme, the height, the weight and other information of the examinee can be known by acquiring the current scanning information of the examinee, and the current SAR value parameter information of the current equipment can be acquired. Sequence information is searched from a sequence database through scanning information and is loaded by a spectrometer, current SAR value acquisition information is acquired from a radio frequency link, gating information is acquired from control information synchronously to calculate the SAR value, the burden of an SAR value calculation module is reduced, and SAR value monitoring is carried out more efficiently and accurately.
In summary, the present application includes at least one of the following beneficial technical effects:
1. the burden of an SAR value calculation module is reduced, and SAR value monitoring is carried out more efficiently and accurately;
2. under the condition of the same hardware resources and calculation resources, the acquisition rate and the acquisition precision in the radio frequency emission interval are improved, and the pulse energy of the radio frequency waveform is acquired more accurately.
Drawings
Fig. 1 is a flow chart of the determination of the ratio K of the instantaneous power of the coil loss to the power on the sampling loop.
Fig. 2 is a flow chart of a method of gated synchronous magnetic resonance SAR value monitoring.
Fig. 3 is a schematic diagram of a structural principle of monitoring SAR values of gating synchronization.
Fig. 4 is a flowchart of a SAR value monitoring calculation method for gating synchronization.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is further described in detail below with reference to fig. 1-4 and the embodiments. 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.
The embodiment of the application discloses a gating synchronous magnetic resonance SAR value monitoring method.
And when the magnetic resonance is installed or changed or the system is corrected, the ratio K of the coil loss instantaneous power under all the receiving coils to the power on the sampling ring is measured for calling in the SAR real-time monitoring process. The determination process is shown in FIG. 1 and includes the following steps:
step 100: and calculating the peak loss power of the coil in the idle state.
Firstly, calculating peak loss power of a coil in no-load, and acquiring real forward radio frequency peak power of a first channel in no-load, real reverse radio frequency peak power of the first channel in no-load, real forward radio frequency peak power of a second channel in no-load and real reverse radio frequency peak power of the second channel in no-load through a sensor.
And defines:
peak power loss of no-load coil is PAir bus；
The real forward RF peak power of the first channel in no-load is P1 unprecedented；
The real reverse RF peak power of the first channel in no-load is P1 air reaction；
True front of second channel when emptyPeak power to radio frequency of P2 space ahead；
The real reverse RF peak power of the second channel in no load is P2 air reaction；
PAir bus=（P1 unprecedented-P1 air reaction）+（P2 space ahead-P2 air reaction）。
Step 101: and acquiring the real monitoring peak power of the sampling ring when the sampling ring is idle.
Acquiring real monitoring peak power of a first sampling ring in no-load and real monitoring peak power of a second sampling ring in no-load through a sensor;
defining:
the real monitoring peak power when the first sampling loop is in no load is PEmpty ring 1；
The real monitoring peak power when the second sampling loop is in no load is PEmpty ring 2；
Step 102: the ratio of the instantaneous power of the coil loss to the power on the sampling loop is calculated.
Defining:
the ratio of the coil loss instantaneous power to the power on the sampling loop is K;
K=Pair bus/(PEmpty ring 1+PEmpty ring 2)；
Referring to fig. 2, a gated synchronous magnetic resonance SAR value monitoring method includes the following steps:
step 200: and acquiring current scanning information of a current subject and current SAR value parameter information of current equipment.
Acquiring current scanning information of a current detected person so as to obtain information such as height, weight, age, a part needing scanning and the like, and acquiring current quality parameter information from a preset quality parameter database according to human body detection information of the current scanning information; and obtaining current coil loss information from the measured magnetic resonance parameter library according to the current scanning part and the adopted coil.
Step 201: and searching current sequence information from a sequence database preset in a scanning computer according to the current scanning information.
And searching the current sequence information by a sequence database preset in a scanning computer through the acquired current scanning information, wherein the corresponding sequence information is different due to different scanning information.
Step 202: and the current sequence information is loaded and executed by the spectrometer to output radio frequency pulses to the radio frequency link and output control information to the radio frequency power amplifier.
And the spectrometer outputs radio frequency pulse to a radio frequency link and simultaneously outputs control information to a radio frequency power amplifier in the loading and executing process, wherein the radio frequency power amplifier is a dual-channel radio frequency power amplifier.
Referring to fig. 3, the spectrometer outputs radio frequency pulses to a dual-channel radio frequency power amplifier, the radio frequency pulses are amplified by the radio frequency power amplifier and output to a dual-channel radio frequency transmitting coil, meanwhile, a bidirectional directional coupler samples radio frequency forward and radio frequency backward, the coil absorption loss is indirectly sampled by a sampling ring 1 and a sampling ring 2, and a radio frequency receiving coil and the like receive magnetic resonance signals, wherein the link is a radio frequency link.
Step 203: and acquiring current SAR value acquisition information in real time from the radio frequency link.
And acquiring current SAR value acquisition information in real time from the radio frequency link so as to be calculated at a later stage.
Step 204: and acquiring a gating signal from the control information, wherein the gating signal comprises a high level signal and a low level signal.
And in the control information, the gate control signals are acquired in real time, so that the extraction operation is carried out in the later period.
Step 205: and if the gating signal is a high-level signal, extracting current SAR value acquisition information.
After the gating signal is obtained, the high level and the low level of the gating signal are judged, and once the gating signal is at the high level, the current SAR value acquisition information corresponding to the high level signal is extracted from the current SAR value acquisition information.
Step 206: and if the gating signal is a low-level signal, extracting the current SAR value acquisition information.
Once at the low level, the current SAR value acquisition information is not extracted and does not participate in the calculation.
Step 207: and acquiring information according to the current SAR value corresponding to the high level to participate in calculation.
Referring to fig. 4, the method for calculating the local SAR value information and the global SAR value information includes the following method steps:
the real monitoring instantaneous total power of the two sampling rings under load is calculated, and the real monitoring instantaneous power of the first sampling ring under load and the real monitoring instantaneous power of the second sampling ring under load are obtained through a sensor.
Defining:
the real monitoring instantaneous total power when two sampling rings are loaded is PCarrier ring assembly；
The real monitoring instantaneous power when the first sampling ring is loaded is PCarrier ring 1；
The real monitored instantaneous power when the second sampling ring is loaded is PCarrier ring 2；
PCarrier ring assembly=PCarrier ring 1+PCarrier ring 2；
Then, calculating the instantaneous total power of the two-channel transmitting coil, and acquiring the real forward radio frequency instantaneous power when the first channel is loaded, the real reverse radio frequency instantaneous power when the first channel is loaded, the real forward radio frequency instantaneous power when the second channel is loaded and the real reverse radio frequency instantaneous power when the second channel is loaded through a sensor;
defining:
the instantaneous total power of the double-channel transmitting coil is PCarrier assembly；
The real forward radio frequency instantaneous power when the first channel is loaded is PBefore loading 1；
The real reverse radio frequency instantaneous power when the first channel is loaded is P1 load reverse；
The real forward radio frequency instantaneous power when the second channel is loaded is PBefore 2 loads；
The real reverse radio frequency instantaneous power when the second channel is loaded is P2 load reversal；
PCarrier assembly=（PBefore loading 1-P1 load reverse）+（PBefore 2 loads-P2 load reversal）。
Then calculating the absorption instantaneous power of the detected person, and acquiring the real monitoring instantaneous total power of the two sampling rings when the two sampling rings are loaded, the instantaneous total power of the two-channel transmitting coil and the ratio of the coil loss instantaneous power to the power on the sampling rings through a sensor;
defining:
the absorption instantaneous power of the subject is PInhaling the examinee；
PInhaling the examinee=PCarrier assembly-K*PCarrier ring assembly。
Then, calculating the total average absorbed power of the examinee, and acquiring the instantaneous absorbed power and sampling time of the examinee through a sensor;
defining:
total average power absorbed by the subject is PFlat subject；
Sampling time information is TMining；
Reference time information is TBase of(ii) a Optionally, the reference time information is 10S and 6 min;
Pflat subject=∑(PInhaling the examinee*TMining)/TBase of。
And finally, calculating the whole-body SAR value of the detected person and the local SAR value of the detected person, and acquiring the whole-body quality parameter of the SAR value and the local quality parameter of the SAR value through a sensor.
Defining:
the subject's overall SAR value is SARAll-purpose；
The local SAR value of the subject is SAROffice；
SAR value the whole body mass parameter is WAll-in-one；
The local quality parameter of SAR value is WLocal mass；
SARAll-purpose=PFlat subject/WAll-in-one；
SAROffice=PFlat subject/WLocal mass。
When monitoring and data calculation are carried out, the current SAR value acquisition information corresponding to the high level is involved in calculation, so that the calculation speed is increased, and the calculation difficulty is reduced.
It will be clear to those skilled in the art that, for convenience and simplicity of description, the foregoing division of the functional modules is merely used as an example, and in practical applications, the above function distribution may be performed by different functional modules according to needs, that is, the internal structure of the device is divided into different functional modules to perform all or part of the above described functions. For the specific working processes of the system, the apparatus and the unit described above, reference may be made to the corresponding processes in the foregoing method embodiments, and details are not described here again.
Based on the same inventive concept, the embodiment of the invention provides a gate-controlled synchronous magnetic resonance SAR value monitoring device, which comprises:
the acquisition module is used for acquiring current scanning information of a current examinee and current SAR value parameter information of current equipment;
the searching module is used for searching current sequence information from a sequence database preset in the scanning computer according to the current scanning information;
the acquisition module is used for loading and executing the current sequence information by the spectrometer to output radio frequency pulses to the radio frequency link and output control information to the radio frequency power amplifier; acquiring current SAR value acquisition information from a radio frequency link, and acquiring a gating signal from control information, wherein the gating signal comprises a high level signal and a low level signal;
the processing module is connected with the acquisition module, the searching module and the acquisition module and is used for processing and storing information;
if the gating signal is a high-level signal, extracting current SAR value acquisition information; if the gating signal is a low-level signal, extracting no current SAR value acquisition information; and acquiring information according to the current SAR value corresponding to the high level to participate in calculation.
It will be clear to those skilled in the art that, for convenience and simplicity of description, the foregoing division of the functional modules is merely used as an example, and in practical applications, the above function distribution may be performed by different functional modules according to needs, that is, the internal structure of the device is divided into different functional modules to perform all or part of the above described functions. For the specific working processes of the system, the apparatus and the unit described above, reference may be made to the corresponding processes in the foregoing method embodiments, and details are not described here again.
An embodiment of the present invention provides a computer-readable storage medium storing a computer program that can be loaded by a processor and execute a magnetic resonance SAR value monitoring method of gate synchronization.
Computer storage media include, for example: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.
Based on the same inventive concept, the embodiment of the invention provides a gating synchronization magnetic resonance SAR value monitoring system, which comprises a memory and a processor, wherein the memory is stored with a computer program which can be loaded by the processor and executes the gating synchronization magnetic resonance SAR value monitoring method.
It will be clear to those skilled in the art that, for convenience and simplicity of description, the foregoing division of the functional modules is merely used as an example, and in practical applications, the above function distribution may be performed by different functional modules according to needs, that is, the internal structure of the device is divided into different functional modules to perform all or part of the above described functions. For the specific working processes of the system, the apparatus and the unit described above, reference may be made to the corresponding processes in the foregoing method embodiments, and details are not described here again.
The foregoing is a preferred embodiment of the present application and is not intended to limit the scope of the application in any way, and any features disclosed in this specification (including the abstract and drawings) may be replaced by alternative features serving equivalent or similar purposes, unless expressly stated otherwise. That is, unless expressly stated otherwise, each feature is only an example of a generic series of equivalent or similar features.
Claims (10)
1. A gating synchronous magnetic resonance SAR value monitoring method is characterized by comprising the following steps:
acquiring current scanning information of a current examinee and current SAR value parameter information of current equipment;
searching current sequence information from a sequence database preset in a scanning computer according to the current scanning information;
loading and executing the current sequence information by a spectrometer to output radio frequency pulses to a radio frequency link and output control information to a radio frequency power amplifier;
acquiring current SAR value acquisition information in real time from a radio frequency link;
collecting a gating signal from the control information, wherein the gating signal comprises a high level signal and a low level signal;
if the gating signal is a high-level signal, extracting current SAR value acquisition information;
if the gating signal is a low-level signal, extracting no current SAR value acquisition information;
and collecting information according to the current SAR value corresponding to the high level to participate in calculating SAR value information.
2. The gated synchronous magnetic resonance SAR value monitoring method according to claim 1, characterized in that the current SAR value parameter information includes quality parameter information and coil loss information; the method for acquiring the quality parameter information and the coil loss information comprises the following steps:
obtaining current quality parameter information from a preset quality parameter database according to human body detection information in the current scanning information;
and obtaining current coil loss information from a preset magnetic resonance parameter library according to the scanning part in the current scanning information.
3. The gated synchronous magnetic resonance SAR value monitoring method according to claim 2, characterized in that the SAR value information includes whole body SAR value information and local SAR value information; the method for acquiring the local SAR value information and the whole-body SAR value information comprises the following steps:
acquiring a whole-body quality parameter of an SAR value, a local quality parameter of the SAR value and total absorbed average power of a detected person;
defining:
the subject's overall SAR value is SARAll-purpose；
The local SAR value of the subject is SAROffice；
SAR value the whole body mass parameter is WAll-in-one；
The local quality parameter of SAR value is WLocal mass；
Total average power absorbed by the subject is PFlat subject；
SARAll-purpose=PFlat subject/WAll-in-one；
SAROffice=PFlat subject/WLocal mass。
4. The gated synchronous magnetic resonance SAR value monitoring method according to claim 3, characterized in that the calculation method of the total average absorbed power of the subject comprises:
acquiring the absorption instantaneous power and sampling time of a detected person;
defining:
total average power absorbed by the subject is PFlat subject；
Sampling time information is TMining；
Reference time information is TBase of；
PFlat subject=∑(PInhaling the examinee*TMining)/TBase of。
5. The gated synchronous magnetic resonance SAR value monitoring method according to claim 4, characterized in that the calculation method of the subject's absorbed instantaneous power comprises:
acquiring real monitoring instantaneous total power of two sampling rings when the two sampling rings are loaded, instantaneous total power of a double-channel transmitting coil and a ratio of coil loss instantaneous power to power on the sampling rings;
defining:
the absorption instantaneous power of the subject is PInhaling the examinee；
Two samplesReal monitoring instantaneous total power when ring is loaded is PCarrier ring assembly；
The instantaneous total power of the double-channel transmitting coil is PCarrier assembly；
The ratio of the coil loss instantaneous power to the power on the sampling loop is K;
Pinhaling the examinee=PCarrier assembly-K*PCarrier ring assembly。
6. The method for gated synchronized magnetic resonance SAR value monitoring of claim 5, characterized in that the method for calculating the instantaneous total power of the two-channel transmit coil comprises:
acquiring real forward radio frequency instantaneous power when a first channel is loaded, real reverse radio frequency instantaneous power when the first channel is loaded, real forward radio frequency instantaneous power when a second channel is loaded and real reverse radio frequency instantaneous power when the second channel is loaded;
defining:
the real forward radio frequency instantaneous power when the first channel is loaded is PBefore loading 1；
The real reverse radio frequency instantaneous power when the first channel is loaded is P1 load reverse；
The real forward radio frequency instantaneous power when the second channel is loaded is PBefore 2 loads；
The real reverse radio frequency instantaneous power when the second channel is loaded is P2 load reversal；
PCarrier assembly=（PBefore loading 1-P1 load reverse）+（PBefore 2 loads-P2 load reversal）；
The method for calculating the real monitoring instantaneous total power when two sampling rings are loaded comprises the following steps:
acquiring real monitoring instantaneous power when a first sampling ring is loaded and real monitoring instantaneous power when a second sampling ring is loaded;
defining:
the real monitoring instantaneous power when the first sampling ring is loaded is PCarrier ring 1；
The real monitored instantaneous power when the second sampling ring is loaded is PCarrier ring 2；
PCarrier ring assembly=PCarrier ring 1+PCarrier ring 2；
The ratio K of the coil loss instantaneous power to the power on the sampling ring is a preset parameter, and the acquisition method comprises the following steps:
acquiring real monitoring peak power of a first sampling ring in no-load, real monitoring peak power of a second sampling ring in no-load and peak loss power of a no-load coil;
defining:
the real monitoring peak power when the first sampling loop is in no load is PEmpty ring 1；
The real monitoring peak power when the second sampling loop is in no load is PEmpty ring 2；
Peak power loss of no-load coil is PAir bus；
K=PAir bus/(PEmpty ring 1+PEmpty ring 2)。
7. The method for monitoring the gated synchronous magnetic resonance SAR value according to claim 6, wherein the method for calculating the peak loss power of the coil during idling comprises:
acquiring real forward radio frequency peak power of a first channel in no-load, real reverse radio frequency peak power of the first channel in no-load, real forward radio frequency peak power of a second channel in no-load and real reverse radio frequency peak power of the second channel in no-load;
defining:
the real forward RF peak power of the first channel in no-load is P1 unprecedented；
The real reverse RF peak power of the first channel in no-load is P1 air reaction；
The real forward RF peak power of the second channel in no-load is P2 space ahead；
The real reverse RF peak power of the second channel in no load is P2 air reaction；
PAir bus=（P1 unprecedented-P1 air reaction）+（P2 space ahead-P2 air reaction）。
8. A gated synchronous magnetic resonance SAR value monitoring device, comprising:
the acquisition module is used for acquiring current scanning information of a current examinee and current SAR value parameter information of current equipment;
the searching module is used for searching current sequence information from a sequence database preset in the scanning computer according to the current scanning information;
the acquisition module is used for loading and executing the current sequence information by the spectrometer to output radio frequency pulses to the radio frequency link and output control information to the radio frequency power amplifier; acquiring current SAR value acquisition information from a radio frequency link, and acquiring a gating signal from control information, wherein the gating signal comprises a high level signal and a low level signal;
the processing module is connected with the acquisition module, the searching module and the acquisition module and is used for processing and storing information;
if the gating signal is a high-level signal, extracting current SAR value acquisition information; if the gating signal is a low-level signal, extracting no current SAR value acquisition information; and acquiring information according to the current SAR value corresponding to the high level to participate in calculation.
9. A computer-readable storage medium, in which a computer program is stored which can be loaded by a processor and which executes the method of any one of claims 1 to 7.
10. A gated synchronized magnetic resonance SAR value monitoring system, characterized by a memory and a processor, the memory having stored thereon a computer program that can be loaded by the processor and that executes the method according to any of claims 1 to 7.
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Denomination of invention: Method, device, storage medium, and system for monitoring magnetic resonance SAR values using gate controlled synchronization Effective date of registration: 20231202 Granted publication date: 20220513 Pledgee: China Co. truction Bank Corp Yuyao branch Pledgor: XINGAOYI MEDICAL EQUIPMENT Co.,Ltd. Registration number: Y2023980068814 |