CN108523891B - Multi-modal medical imaging system and monitoring method and monitoring device thereof - Google Patents
Multi-modal medical imaging system and monitoring method and monitoring device thereof Download PDFInfo
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Abstract
The application relates to a monitoring method of a multi-modality medical imaging system. The monitoring method of the multi-modality medical imaging system comprises the following steps: acquiring first acquisition data information obtained by scanning a target tissue of a detected object by the first modality medical imaging equipment; extracting performance monitoring data of the first modality medical imaging device on the second modality medical imaging device from the first acquisition data information; and judging whether the performance monitoring data meets the preset standard of the second modality medical imaging equipment during working. The application also relates to a multi-modality medical imaging system and a monitoring device thereof. According to the multi-modal medical imaging system and the monitoring method and device thereof, the performance monitoring data is extracted from the first collected data information, and whether the performance monitoring data meets the preset standard or not is judged. Therefore, the performance of the second modality medical imaging equipment is monitored simply and conveniently, and the monitoring efficiency is high.
Description
Technical Field
The present application relates to the field of medical imaging devices, and in particular, to a multi-modality medical imaging system, a monitoring method for the multi-modality medical imaging system, and a monitoring apparatus for the multi-modality medical imaging system.
Background
In medical clinical diagnosis and medical research, various medical imaging apparatuses, such as Positron Emission Tomography (PET), Single Photon Emission Computed Tomography (SPECT), Computed Tomography (CT), and magnetic resonance imaging (MR), are widely used. Among other things, CT images, MR images can provide morphological and structural information of the imaged site. PET images can provide metabolic and functional information of the imaged site. However, the imaging mode of either device has its own drawbacks. For example, CT scanning has good imaging results for tissues with large density differences and high spatial and temporal resolution, but poor soft tissue contrast. MR imaging has a high contrast to soft tissue, but the imaging results are often difficult to quantify. PET scanning is highly sensitive and specific, but has poor spatial resolution. Compared with the medical imaging equipment with a single modality, the medical imaging equipment with different modalities can be combined to obtain more comprehensive morphological parameters, metabolic parameters and other parameters of the imaged tissue, can realize information complementation and is greatly helpful for accurate diagnosis.
In a multi-modality medical imaging apparatus, there is usually interference of one imaging modality with another imaging modality or mutual interference of two modalities, which means that the multi-modality medical imaging apparatus faces the problem of performance monitoring. In a multi-modality imaging apparatus based on magnetic resonance imaging, such as a PET-MR apparatus, for example, during operation, the PET-MR apparatus needs to be provided with a special monitoring module to monitor characteristics of gradient magnetic field intensity, radio frequency energy, vibration, ignition and the like during MR scanning. This results in more complex and less efficient performance monitoring of the MR in PET-MR.
Disclosure of Invention
Therefore, it is necessary to provide a multi-modality medical imaging system, a monitoring method for the multi-modality medical imaging system, and a monitoring apparatus for the multi-modality medical imaging system, in order to solve the problems of complex performance monitoring and low efficiency of a single imaging modality in a multi-modality imaging device.
According to an aspect of the present application, a method of monitoring a multi-modality medical imaging system including at least a first modality medical imaging apparatus and a second modality medical imaging apparatus disposed on a same support structure is presented, the method comprising:
acquiring first acquisition data information obtained by scanning a target tissue of a detected object by the first modality medical imaging equipment;
extracting performance monitoring data of the first modality medical imaging device on the second modality medical imaging device from the first acquisition data information; and
and judging whether the performance monitoring data meets the preset standard of the second modality medical imaging equipment during working so as to judge whether the performance of the second modality medical imaging equipment during working meets the requirement.
In one embodiment, the first acquisition data information includes first modality medical data and performance monitoring data, and the first modality medical data and the performance monitoring data correspond to different frequencies;
the step of extracting performance monitoring data of the first modality medical imaging device to the second modality medical imaging device from the first acquisition data information comprises:
and extracting the performance monitoring data from the first collected data information according to the frequency corresponding to the performance monitoring data.
In one embodiment, the step of determining whether the performance monitoring data meets the preset standard of the second modality medical imaging device during operation to determine whether the second modality medical imaging device during operation meets the performance requirement further includes:
and generating a performance monitoring image according to the performance monitoring data and the preset standard.
In one embodiment, the first modality medical imaging device is a positron emission tomography device or a single photon emission tomography device; the second modality medical imaging device is a magnetic resonance imaging device;
the performance monitoring image includes at least one of a gradient magnetic field strength image, a specific absorption rate image, or a noise image.
In one embodiment, the step of determining whether the performance monitoring data meets the preset standard of the second modality medical imaging device in operation further comprises:
when the performance monitoring data meets the preset standard, the first modality medical imaging device is controlled to image the examinee to acquire second modality medical data while the first modality medical imaging device acquires the first acquisition data information.
According to another aspect of the present application, a monitoring apparatus of a multi-modality medical imaging system is provided, the multi-modality medical imaging system including at least a first modality medical imaging device and a second modality medical imaging device, the monitoring apparatus comprising:
the acquisition module is used for acquiring first acquisition data information obtained by scanning a target tissue of a detected object by the first modality medical imaging equipment;
an extraction module for extracting performance monitoring data of the first modality medical imaging device on the second modality medical imaging device from the first acquisition data information; and
and the judging module is used for judging whether the performance monitoring data meets the preset standard of the second modality medical imaging equipment during working so as to judge whether the performance of the second modality medical imaging equipment during working meets the requirement.
In one embodiment, the monitoring apparatus of the multi-modality medical imaging system further includes an image generation module for generating a performance monitoring image based on the performance monitoring data and the performance criteria.
In one embodiment, the first modality medical imaging device is a positron emission tomography device or a single photon emission tomography device; the second modality medical imaging device is a magnetic resonance imaging device;
the performance monitoring image includes at least one of a gradient magnetic field strength image, a specific absorption rate image, or a noise image.
According to yet another aspect of the present application, a multi-modality medical imaging system is provided, comprising:
the coil support is arranged in a surrounding mode, and an accommodating space is formed in the inner side of the coil support;
a radio frequency coil disposed outside of the support structure;
at least two supporting pieces, wherein the two supporting pieces are respectively arranged on the outer surface of the radio frequency coil in a surrounding manner;
a probe disposed between the at least two supports; the detector is used for scanning the target tissue of the detected object to obtain first acquisition data information;
the switching device is electrically connected with the detector and used for extracting performance monitoring data from the first collected data information, and the monitoring data is used for monitoring whether the radio frequency coil meets a preset standard or not.
In one embodiment, the switching device includes a first filter for outputting performance monitoring data of the radio frequency coil and a second filter for outputting performance monitoring data of the gradient coil.
According to the multi-modality medical imaging system and the monitoring method and device thereof, the detector related to the first modality medical imaging device comprises the electromagnetic wave sensitive material or the temperature sensitive material, when the first modality medical imaging device scans and images the examinee, the performance or the working state of the second modality medical imaging device can be monitored, and then the multi-modality medical imaging system processes the data into the first acquisition data information, namely: the first acquisition data information fuses medical imaging data of the first modality medical imaging device on the subject and monitoring data of the second modality medical imaging device. The multi-modal medical imaging system is provided with the switching device, the switching device can extract performance monitoring data from the first collected data information, and the multi-modal medical imaging system can further judge whether the performance monitoring data meet preset standards. The monitoring method of the multi-modality medical imaging system can monitor the performance of the second modality medical imaging equipment more conveniently, and monitoring efficiency is higher. In addition, one transmission channel is multiplexed in the transmission process of the first-mode medical data and the performance monitoring data, and channel data transmitted by multi-mode system signals are reduced.
Drawings
FIG. 1 is a flow diagram of a monitoring method of a multi-modality medical imaging system according to an embodiment;
FIG. 2 is a schematic diagram of a multi-modality medical imaging system according to an embodiment;
FIG. 3 is a schematic view of a detector in the PET-MR system shown in FIG. 2;
FIG. 4 is a schematic diagram of an internal structure of a probe according to an embodiment;
FIG. 5 is a schematic diagram of the internal structure of a probe according to another embodiment;
FIG. 6 is a flow diagram of a monitoring method of a multi-modality medical imaging system according to another embodiment;
FIG. 7 is a gradient magnetic field strength image generated from monitored data according to an embodiment;
fig. 8 is a block diagram of a monitoring apparatus of the multi-modality medical imaging system according to an embodiment.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present application more comprehensible, embodiments accompanying the present application are described in detail below with reference to the accompanying drawings.
The present application proposes a multi-modality medical imaging system that includes at least a first modality medical imaging device and a second modality medical imaging device. The first modality medical imaging apparatus has two roles, one is to scan a subject (patient) to obtain morphological parameters, metabolic parameters, and the like of an imaged tissue. Another function is to monitor the performance of the second modality medical imaging apparatus by means of its own electronics. The multi-modality medical imaging system may include a first modality medical imaging device and a second modality medical imaging device disposed on the same support structure, the first modality medical imaging device and the second modality medical imaging device being coaxially disposed, for example: the first modality medical imaging device may be MR and the second modality medical imaging device may be PET or SPECT, i.e. the multi-modality medical imaging system may be PET-MR or SPECT-MR. In this embodiment, the multi-modality medical imaging system is PET-MR. In one embodiment, the first modality medical imaging device is configured as an MR system including a magnet, an RF coil, and a gradient coil, and the second modality medical imaging device is configured as a PET system including a detector, wherein: the detector comprises or integrates a monitoring component which can be set into a component with an antenna effect and is used for sensing or monitoring electromagnetic waves with various frequencies; the monitoring component can also be arranged as a temperature sensitive component and can generate corresponding physical parameter information under different temperatures, and the physical parameter information and the temperature information of the detector are in a linear or nonlinear relation, and the temperature of the detector can be determined through the physical parameter. Based on this, the detector of the embodiment of the present application can be used for monitoring the radio frequency energy or gradient pulse energy of the MR.
Fig. 1 is a flowchart illustrating a monitoring method of a multi-modality medical imaging system according to an embodiment. The monitoring method of the multi-modal medical imaging system comprises the following steps:
step S120, acquiring first acquisition data information obtained by the first modality medical imaging device scanning a target tissue of a subject.
Optionally, as mentioned above, the first modality medical imaging apparatus has two roles, one is to scan the subject (patient) for morphological parameters, metabolic parameters, etc. of the imaged tissue. Another function is to monitor the performance of the second modality medical imaging apparatus by means of its own electronics. In this embodiment, the first modality medical imaging device is a PET imaging scanning system. First acquisition data information may be acquired by detecting a target tissue or a target organ of a subject using a first modality medical imaging device. The first acquisition data information includes imaging data of a scan of a subject by a first modality imaging device and performance monitoring information for a second modality medical imaging device.
In this embodiment, the second modality medical imaging apparatus is an MR apparatus, and the first modality medical imaging apparatus is disposed coaxially with the second modality medical imaging apparatus. In one embodiment, the multi-modality medical imaging system may include a coil support surrounding and forming an accommodation space at an inner side thereof, and the radio frequency coil corresponding to the MR device may be disposed at an outer side of the coil support. Detectors of a PET apparatus are disposed between the radio frequency coil and the gradient coils for scanning a target tissue of a subject to obtain first acquisition data information. The detector may include a crystal, a sensor disposed on the crystal, and a circuit board. Wherein: positron generated by isotope decay in a living body is annihilated with negative electron in the living body to generate one or more pairs of gamma rays, and the crystal is used for receiving the gamma rays and generating an optical signal; a sensor disposed on the crystal may receive the optical signal and convert the optical signal to an electrical signal. Further, the circuit board may receive electrical signals from the sensors and amplify and/or filter the electrical signals.
In one embodiment, the circuit board may include an electromagnetic wave sensitive material, and the circuit board itself has a certain antenna effect, and may be used for sensing electromagnetic waves of various frequencies. Therefore, the detector can simultaneously detect the electromagnetic wave of the RF pulse, the electromagnetic wave of the gradient pulse, and the electromagnetic wave generated in an abnormal case while acquiring the imaging data, and different kinds of electromagnetic waves can have different frequency bands. Alternatively, the sensor and the circuit board may be disposed independently of each other, or the sensor and the circuit board may be integrated into a single structure.
In one embodiment, the circuit board may contain temperature sensitive material capable of generating a physical parameter corresponding to temperature information of the probe itself.
In one implementation, the first modality medical imaging device and the second modality medical imaging device may simultaneously perform a scan of a target tissue or a target organ of a subject over a period of time. Or, within a certain time period, the second modality medical imaging device is in a standby state, and only the first modality medical imaging device performs scanning on the target tissue of the detected object; alternatively, during a certain period of time, the first modality medical imaging device is in a standby state and only the second modality medical imaging device performs a scan of the subject target tissue.
In one embodiment, the first acquisition data information of the first modality medical imaging apparatus is acquired once every preset time interval. This means that during the operation of the multi-modality medical imaging system, the system monitors the second modality medical imaging device according to the preset frequency, and the system does not need to continuously monitor the second modality medical imaging device, so as to save the system operation resources. A transmission channel is multiplexed in the transmission process of the first-mode medical data and the performance monitoring data, so that channel data transmitted by multi-mode system signals are reduced.
And step S140, extracting performance monitoring data of the first modality medical imaging device to the second modality medical imaging device from the first acquisition data information.
Optionally, the first modality medical data and the performance monitoring data in the first acquisition data information may correspond to different frequencies. Alternatively, the performance monitoring data may be gradient magnetic field strength characterization data, radio frequency energy absorption characterization data, vibration strike characterization data, or the like. The above information can be used as key information for judging the performance index of the second modality medical imaging equipment. In this embodiment, the performance monitoring data of the first modality medical imaging apparatus to the second modality medical imaging apparatus is extracted from the first acquired data information, so that the performance of the second modality medical imaging apparatus during operation can be analyzed based on the performance monitoring data.
Step S160, determining whether the performance monitoring data meets a preset standard of the second modality medical imaging device during operation, so as to determine whether the performance of the second modality medical imaging device during operation meets a requirement.
Optionally, if the performance monitoring data meets a preset standard of the second modality medical imaging device during operation, or the obtained performance monitoring data is within a preset standard range, determining that the performance of the second modality medical imaging device meets the requirement; otherwise, judging that the performance of the second modality medical imaging equipment does not meet the requirement.
According to the monitoring method of the multi-modality medical imaging system, the first modality medical imaging device scans and images the examinee, the second modality medical imaging device is monitored, and the system processes the first acquisition data information. Namely, the first acquisition data information fuses the scanning data of the first modality medical imaging device to the subject and the detection data of the second modality medical imaging device. And extracting performance monitoring data from the first collected data information, and judging whether the performance monitoring data meets a preset standard or not. Therefore, the performance of the second modality medical imaging equipment is monitored simply and conveniently, and the monitoring efficiency is high.
Fig. 2 is a schematic structural diagram of a multi-modality medical imaging system according to an embodiment. The multi-modality medical imaging system 200 in the present embodiment is exemplified by a PET-MR system. As shown in fig. 2, the first modality medical imaging apparatus is a positron emission tomography apparatus (PET apparatus). The second modality medical imaging device is a magnetic resonance imaging device (MR device).
As shown in fig. 2, the multi-modality medical imaging system 200 includes a radio frequency coil support 201, the radio frequency coil support 201 is substantially cylindrical, and has an inner cavity 2011 and an outer surface 2012, a plurality of positioning portions are formed on the outer surface 2012 of the radio frequency coil support 201, and the positioning portions may be configured as grooves, and the grooves may be generated by slotting on the outer surface of the radio frequency coil. In this embodiment, the rf coil bracket 201 may be made of a high voltage breakdown resistant glass fiber reinforced plastic material to form a cylindrical structure, the thickness of the cylindrical structure is about 20-30mm, and a groove with a depth of about 5-15mm is formed in the outer surface 2012 of the rf coil bracket 201. The grooves comprise a first groove 202 and a second groove 203 which are orthogonal to each other, the two first grooves 202 are arranged around the circumference of the radio frequency coil support 201 and are arranged oppositely, the plurality of second grooves 203 extend along the axial direction of the radio frequency coil support 201, and the first grooves 202 are communicated with the second grooves 203. Be provided with radio frequency coil in the above-mentioned recess, specifically do: an end ring 204 is oppositely arranged in the first groove 202, and the end ring 204 can be composed of discontinuous copper sheets or conducting wires; the plurality of leg portions 205 are arranged in the second groove 203, the leg portions 205 are made of conducting wires or copper sheets and are wrapped by a PCB, the leg portions 205 connect the edges of the two oppositely arranged end rings 204 and are not overlapped with each other, therefore, the end rings 204 and the leg portions 205 jointly form a radio frequency coil, and the thickness of the radio frequency coil is smaller than the depth of the first groove 202 or the second groove 203.
Further, to remove the coupling between the plurality of coil loops, a decoupling device is connected to the radio frequency coil, which is received in the decoupling receptacle 206. The decoupling receptacle 206 is disposed on an outer surface 2012 of the radio frequency coil carrier 201, specifically disposed outside of the first recess 202, and is in communication with the first recess 202. The radio frequency coils may be decoupled from each other by connection decoupling means. In addition, a large amount of heat can be generated in the working process of the radio frequency coil, the radio frequency coil is arranged on the outer surface of the coil support, a thicker heat insulation layer is arranged between the radio frequency coil and the inner cavity, the inner cavity can be directly used as a scanning inner cavity which is in contact with a detected person, and a heat insulation layer does not need to be designed.
A guide rail 207 for supporting a patient bed is arranged at the lower half part of an inner cavity 2011 of the radio frequency coil support 201, the guide rail 207 extends along the axial direction of the inner cavity 2011, and the patient bed can be matched with the guide rail 207 to move in the inner cavity 2011. It should be noted that, in other embodiments, the positioning portion may also be formed through the following processes: according to the actual demand, the thickness of the radio frequency support is reduced, a plurality of bosses which are arranged in parallel are bonded on the outer surface of the radio frequency coil, the bosses are arranged to be parallel to the axial direction (indicated by dotted lines in the figure) of the radio frequency coil support, and gaps among the bosses can be used as positioning parts for fixing the radio frequency coil.
Figure 3 is a schematic diagram of a detector in the PET-MR system shown in figure 2. As shown in fig. 3, the support members 208 may be provided on an outer surface 2012 of the rf coil carrier 201, and the support members 208 may be provided coaxially with the rf coil carrier 201, with an axial spacing between the support members 208 corresponding to a length of the PET detector 209 such that the PET detector 209 is disposed just between the two support members 208, and the support members 208 may be provided as two annular bodies arranged apart from each other in the axial direction. The probe 209 is provided with probe mounting holes at both ends thereof, and correspondingly, the support member is also provided with support member mounting holes, and the fixing member passes through the probe mounting holes and the support member mounting holes to fix the probe 209 on the support member 208. Of course, gradient coils are also provided on the outside of the above-described apparatus for generating gradient fields in the X-axis, Y-axis or Z-axis directions. Optionally, in order to reduce the influence of the RF coil on the detector, one or more shielding layers 210 may be further coated on the outer surface 2012 of the RF coil support 201 for reducing the influence of the RF energy on the detector.
The probe 209 may include a housing, a plurality of components disposed inside the housing, the plurality of components including a crystal unit (crystal array), a circuit board connected to the crystal unit, the circuit board may have a sensor unit integrated therewith, or the sensor unit may be disposed between the circuit board and the crystal unit.
Fig. 4 is a schematic diagram of the internal structure of the detector according to an embodiment, and the detector 209 may include a crystal array composed of a plurality of crystal units 2091, each crystal unit 2091 in the crystal array composed of the detector has a first end S1 and a second end S2 opposite to each other, a readout circuit may be disposed on the first end S1, and the second end S2 is typically an incident end of gamma rays. The readout circuit includes: an electronic circuit board 2092, and a sensor unit 2093 disposed between the electronic circuit board 2092 and the crystal unit 2091. Wherein the crystal unit 2091 is configured to receive gamma rays generated by an annihilation event and generate an optical signal; the sensor unit 2093 may receive the optical signal and convert the optical signal into an electrical signal; the circuit board 2092 may amplify and/or filter the electrical signals.
Fig. 5 is a schematic diagram of the internal structure of a detector according to another embodiment. The detector 209 may include a crystal array of multiple crystal units 2091, which differs from the above embodiments in that: the sensor unit 2093 is integrated within the circuit board 2092.
Alternatively, the crystal unit may be made of a variety of materials. For example, the material of the crystal unit may also be at least one of: bismuth germanate, lutetium silicate, lutetium yttrium silicate, lutetium gadolinium silicate, yttrium silicate, barium fluoride, sodium iodide, cesium iodide, lead tungstate, yttrium aluminate, lanthanum bromide, lanthanum chloride, lutetium aluminum calcium titanium, lutetium pyrosilicate, lutetium aluminate, and lutetium iodide.
The readout circuit may be coupled to its corresponding crystal cell. Wherein the coupling comprises the sensor being in contact with the crystal unit or by means of an adhesive material. In more specific embodiments, the sensor may be an Avalanche Photodiode (APD), Silicon photomultiplier (SiPM). It should be noted that, the sensor unit in the readout circuit of the present application can generate a change in an internal physical parameter under an RF field, a gradient field, or a certain temperature condition, and the change in the two internal physical parameters has a corresponding relationship with the energy value of the RF field, the energy value of the gradient field, and the ambient temperature, that is: the detector of the present application is capable of acquiring RF fields, gradient fields, or heat related physical parameters while acquiring PET data information.
The circuit board 2092 may be made of an electromagnetic wave sensitive material, and has a certain antenna effect, so that it can be used to sense and acquire electromagnetic waves of various frequencies. Alternatively, the type of electromagnetic wave may be a radio frequency (field) electromagnetic wave, a gradient field electromagnetic wave, an energy field electromagnetic wave. The radio frequency electromagnetic wave can correspond to a radio frequency field generated by a radio frequency coil of the MR system; the gradient field electromagnetic wave can correspond to a gradient field generated by a gradient coil of the MR system; the energy field electromagnetic waves may be ignited in response to vibrations generated by the mutual electromagnetic field effects between the electronic components of the MR system. It should be noted that different types of electromagnetic waves may correspond to different frequency bands, for example: the wave band of the radio frequency electromagnetic wave can be 300 KHz-300 GHz, and the gradient field electromagnetic wave or the energy field electromagnetic wave can correspond to other frequency bands.
In clinical application, the higher the frequency of the radio frequency pulse and the gradient pulse, the higher the corresponding energy. The patient has a threshold of tissue heating, contact heating, metal heating, and SAR values associated with the radio frequency field electromagnetic waves. When the tissue is heated, the contact point is heated, the metal is heated, and the SAR value exceeds the bearing threshold of the patient, the staff switches the pulse sequence with the crossed frequency, the radio frequency sequence or terminates the scanning so as to relieve the pain of the patient in the process of receiving the scanning. In this embodiment, the probe 209 is connected to a switching device 211. The switching device is used for extracting performance monitoring data from the first acquired data information, and the performance monitoring data is used for monitoring whether the radio frequency coil and/or the gradient coil meet preset standards. The detector 209 may then detect the time varying gradient magnetic field to prevent the gradient magnetic field from causing cardiac stimulation and ventricular fibrillation. Typically, painful nerve stimulation typically occurs at about twice the mean stimulus sensation threshold. Some discomfort occurs at about 1.5 times the mean gradient strength (PNS) threshold. In this embodiment, the normal mode (minimal stimulation) PNS may be set to a mean stimulation sensation threshold of 70% -80%. The detector 209 can monitor the PNS value at any time and can change to the normal mode if the patient cannot tolerate PNS. Otherwise, the patient continues to be scanned with the pulse sequence at the lower conversion rate. It should be noted that, before the data is transmitted to the switching device 211, the medical data of the first modality included in the first acquired data information and the performance monitoring data of some imaging devices of the second modality are multiplexed by one signal transmission channel, which effectively reduces the number of output channels of signals.
Optionally, the switching device comprises a first filter and a second filter, the first filter output generating performance monitoring data of the radio frequency coil, and the second filter being used for outputting performance monitoring data of the gradient coil.
Fig. 6 is a flowchart illustrating a monitoring method of the multi-modality medical imaging system according to another embodiment. The first modality medical imaging device is a positron emission tomography device or a single photon emission tomography device (PET device); the second modality medical imaging device is a magnetic resonance imaging device (MR device). The multi-modality medical imaging system in this embodiment is still exemplified by a PET-MR system.
In this embodiment, the step of determining whether the performance monitoring data meets the preset standard when the second modality medical imaging apparatus operates, that is, after step S160, includes:
and step S180, generating a performance monitoring image according to the performance monitoring data and a preset standard.
Specifically, the system processes the performance monitoring data and generates a performance monitoring image according to the performance monitoring data and a preset standard. The performance monitoring image can reflect the performance parameters of the second modality medical imaging apparatus more intuitively. I.e. for the performance observation of the second modality medical imaging apparatus.
Three performance characterizations of a magnetic resonance system are usually characterized by the magnetic field strength (PNS) of the gradient, the Specific Absorption Rate (SAR) and the noise (SPARK). In this embodiment, the performance monitoring image may include at least one of a gradient magnetic field strength image, a radio frequency energy image, or a vibration sparking image, from which at least one of a gradient magnetic field strength, a specific absorption rate (SAR value), or noise (referred to as transient spike noise) may be observed. The staff can observe the performance of the MR device by the gradient magnetic field intensity image, the SAR value image or the noise fire image. In this embodiment, the performance monitoring image simultaneously includes a gradient magnetic field intensity image, an SAR value image, and a noise image.
Fig. 7 is a gradient magnetic field strength image generated according to monitoring data according to an embodiment of the present application. Wherein the gradient field selects a bipolar gradient, and the diagram has two scale axes in two directions, wherein the scale axis in the transverse direction represents time and changes from-1 mS to 1 mS; the scale axis in the longitudinal direction represents the monitored gradient signal intensity, varying from-30.0 mV to 50.0 mV. Corresponding to the radio frequency pulses emitted at different times, the detectors of the PET system can acquire the strength of the gradient field instantaneously. Utilize PET detector self to receive as low frequency signal in this application, can sensitively monitor gradient waveform and amplitude, through this gradient magnetic field intensity image, the staff can know the gradient performance of magnetic resonance system at any time.
In an embodiment, the step of determining whether the performance monitoring data meets the preset standard when the second modality medical imaging apparatus is operating, namely step S160 is followed by:
when the performance monitoring data meets the preset standard, the first modality medical imaging device is controlled to image the examinee to acquire the second modality medical data while the first modality medical imaging device acquires the first acquisition data information.
In particular, when the performance monitoring data meets the preset criteria, indicating that the second modality medical imaging apparatus is satisfactory, the subject may be examined. Therefore, the second modality medical imaging device is controlled to image the examinee to acquire the second modality medical data while the first modality medical imaging device acquires the first acquisition data information, so as to ensure that the multi-modality medical imaging system works normally.
A storage medium having stored thereon a computer program which, when executed by a processor, is operable to perform the steps of the method of any one of the preceding claims.
A monitoring apparatus of a multi-modality medical imaging system includes a memory and a processor; the memory has stored therein a computer program. The processor calls the computer program from the memory to perform the steps of the method of any of the above.
Fig. 8 is a block diagram of a monitoring apparatus of the multi-modality medical imaging system according to an embodiment. A multi-modality medical imaging system includes at least a first modality medical imaging device and a second modality medical imaging device. As shown in fig. 8, the multi-modality medical imaging system monitoring apparatus includes:
an obtaining module 120, configured to obtain first acquisition data information obtained by a first modality medical imaging device scanning a target tissue of a subject;
an extraction module 140, configured to extract performance monitoring data of the first modality medical imaging device on the second modality medical imaging device from the first acquired data information; and
the determining module 160 is configured to determine whether the performance monitoring data meets a preset standard of the second modality medical imaging apparatus during operation, so as to determine whether the performance of the second modality medical imaging apparatus during operation meets a requirement.
According to the monitoring device of the multi-modality medical imaging system, the first modality medical imaging equipment is used for scanning and imaging the examinee, the second modality medical imaging equipment is monitored, and then the system processes the first acquisition data information. That is, the first acquisition data information fuses the scan data of the first modality medical imaging device to the subject (first modality medical data) and the detection data of the second modality medical imaging device. And extracting performance monitoring data from the first collected data information, and judging whether the performance monitoring data meets a preset standard or not. Therefore, the performance of the second modality medical imaging equipment is monitored simply and conveniently, and the monitoring efficiency is high.
In one embodiment, the monitoring apparatus of the multi-modality medical imaging system further includes an image generation module for generating performance monitoring images based on the performance monitoring data and the performance criteria.
In one embodiment, the first modality medical imaging device is a positron emission tomography device or a single photon emission tomography device; the second modality medical imaging device is a magnetic resonance imaging device. The performance monitoring image includes at least one of a gradient magnetic field strength image, a specific absorption rate image, or a noise image.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A method of monitoring a multi-modality medical imaging system including at least a first modality medical imaging device and a second modality medical imaging device disposed on a same support structure, the method comprising:
acquiring first acquisition data information obtained by scanning a target tissue of a detected object by the first modality medical imaging equipment;
extracting performance monitoring data of the first modality medical imaging device on the second modality medical imaging device from the first acquisition data information; and
judging whether the performance monitoring data meets a preset standard of the second modality medical imaging equipment during working so as to judge whether the performance of the second modality medical imaging equipment during working meets requirements; and when the performance monitoring data meets the preset standard, controlling the second modality medical imaging device to scan the examinee to acquire second modality medical data while the first modality medical imaging device acquires the first acquired data information.
2. The method according to claim 1, wherein the first acquisition data information includes first modality medical data and performance monitoring data, the first modality medical data and the performance monitoring data corresponding to different frequencies;
the step of extracting performance monitoring data of the first modality medical imaging device to the second modality medical imaging device from the first acquisition data information comprises:
and extracting the performance monitoring data from the first collected data information according to the frequency corresponding to the performance monitoring data.
3. The method of claim 1, wherein the step of determining whether the performance monitoring data meets a predetermined criterion for operation of the second modality medical imaging device to determine whether performance of the second modality medical imaging device is satisfactory further comprises:
and generating a performance monitoring image according to the performance monitoring data and the preset standard.
4. The method of claim 3, wherein the first modality medical imaging device is a positron emission tomography device or a single photon emission tomography device; the second modality medical imaging device is a magnetic resonance imaging device.
5. The method of claim 3, wherein the performance monitoring image comprises at least one of a gradient magnetic field strength image, a specific absorption rate image, or a noise image.
6. A monitoring apparatus of a multi-modality medical imaging system including at least a first modality medical imaging device and a second modality medical imaging device, the monitoring apparatus comprising:
the acquisition module is used for acquiring first acquisition data information obtained by scanning a target tissue of a detected object by the first modality medical imaging equipment;
an extraction module for extracting performance monitoring data of the first modality medical imaging device on the second modality medical imaging device from the first acquisition data information; and
the judging module is used for judging whether the performance monitoring data meets the preset standard of the second modality medical imaging equipment during working so as to judge whether the performance of the second modality medical imaging equipment during working meets the requirement; and when the performance monitoring data meets the preset standard, controlling the second modality medical imaging device to scan the examinee to acquire second modality medical data while the first modality medical imaging device acquires the first acquired data information.
7. The apparatus of claim 6, further comprising an image generation module to generate a performance monitoring image based on the performance monitoring data and the performance criteria.
8. The apparatus of claim 7, wherein the first modality medical imaging device is a positron emission tomography device or a single photon emission tomography device; the second modality medical imaging device is a magnetic resonance imaging device;
the performance monitoring image includes at least one of a gradient magnetic field strength image, a specific absorption rate image, or a noise image.
9. A multi-modality medical imaging system, comprising:
the coil support is arranged in a surrounding mode, and an accommodating space is formed by inner measurement;
the radio frequency coil is arranged on the outer side of the coil support;
at least two supporting pieces, wherein the two supporting pieces are respectively arranged on the outer surface of the radio frequency coil in a surrounding manner;
a probe disposed between the at least two supports; the detector is used for scanning the target tissue of the detected object to obtain first acquisition data information;
the switching device is electrically connected with the detector and used for extracting performance monitoring data from the first acquired data information, and the monitoring data is used for monitoring whether the radio frequency coil meets a preset standard or not;
a memory storing a computer program;
a processor, from which the processor invokes the computer program to perform the steps of the method of any of claims 1-5.
10. The multi-modality medical imaging system of claim 9, further comprising a gradient coil disposed outside the probe, the interface including a first filter for outputting performance monitoring data of the radio frequency coil and a second filter for outputting performance monitoring data of the gradient coil.
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