236 results about "Cerebral mri" patented technology

The invention discloses an Alzheimer's disease early screening method based on magnetic resonance imaging, and relates to the technical field of magnetic resonance imaging, and the method comprises the steps: obtaining information identity data and magnetic resonance scanning image data of a to-be-detected person; preprocessing the magnetic resonance scanning image data, and calculating a brain area volume and a DTI-ALPS index according to the preprocessed magnetic resonance scanning image data; constructing a brain network and calculating global network attributes and regional node attributes according to the brain network; substituting the information identity data, the brain area volume, the DTI-ALPS index, the global network attribute and the area node attribute of the to-be-tested person into an Alzheimer's disease screening model to calculate diagnosis parameters; and comparing the diagnosis parameter with the optimal diagnosis threshold value to obtain a screening result. According to the method, the brain colloidal lymphatic network function is evaluated by means of multiple high-sensitivity nerve image indexes, and the early screening capability of the Alzheimer's disease is improved.

The invention relates to a long-core nuclear magnetic resonance scanning experimental device and experimental method, and relates to the technical field of oil-gas field development. Comprising the following steps: a nuclear magnetic resonance spectrometer is arranged on a rock core translation loading bed; a first guide rail is arranged on the core translation loading bed on one side of the nuclear magnetic resonance spectrometer, a second guide rail is arranged on the other side of the nuclear magnetic resonance spectrometer, and two ends of the first guide rail and the second guide rail are positioned on the same straight line; a first supporting mechanism is arranged on the first guide rail, and a second supporting mechanism is arranged on the second guide rail; one end of the long sample clamping mechanism is connected with the first supporting mechanism, the other end of the long sample clamping mechanism is connected with the second supporting mechanism, and the long sample clamping mechanism penetrates through a waveguide tube of the nuclear magnetic resonance imaging analyzer; the driving mechanism is connected with the second supporting mechanism. The problems that when an existing nuclear magnetic resonance imaging analyzer scans a rock core, only the rock core with the length smaller than 150 mm can be scanned, and the requirement for conducting a scanning experiment on the long rock core with the length larger than 300 mm cannot be met are solved.

The invention discloses a magnetic resonance image positioning diagnosis method based on artificial intelligence, and relates to the technical field of medical image processing and diagnosis. S100, data acquisition and preprocessing, S200, model construction, S300, strategy learning and optimization, S400, personalized scanning path generation, and S500, real-time feedback and adjusting.According to the method, the lesion area of a patient is accurately covered, and scanning of the non-lesion area is reduced, so that the imaging efficiency is improved, the scanning time is shortened, and the imaging accuracy is improved. The imaging quality of a lesion area is remarkably improved, so that the diagnosis accuracy is improved, a traditional magnetic resonance scanning path often adopts a unified standard, individual requirements of different patients are difficult to meet, unclear imaging or omission of the lesion area is easily caused, and the diagnosis result is affected. According to the method, through personalized scanning path design, the defect is overcome, and a more accurate and reliable diagnosis basis is provided for doctors.

The invention provides a femoral head necrosis recognition system and method based on deep learning, and the method comprises the steps: obtaining a multi-mode magnetic resonance image of a hip joint of an examined person, and the multi-mode magnetic resonance image comprises a magnetic resonance image formed by a plurality of magnetic resonance scanning sequences; loading a pre-trained image segmentation model to identify a femoral head and an acetabulum in the hip joint of the multi-modal magnetic resonance image, and segmenting the femoral head and the acetabulum to obtain a femoral head segmentation image of the magnetic resonance image of each scanning sequence; performing enhancement processing on each femoral head segmentation image; extracting femoral head feature data of each femoral head segmentation image type and forming splicing feature data; and loading a pre-trained necrosis recognition model to process the spliced feature data to obtain femoral head necrosis recognition results under each magnetic resonance scanning sequence and output the femoral head necrosis recognition results. The diagnosis accuracy can be improved, and the misdiagnosis rate is reduced.

The invention provides a free breathing heart multi-parameter simultaneous quantitative magnetic resonance imaging method and device, a terminal and a medium, and the method comprises the steps: carrying out the scanning of the heart tissue of a detected object in a free breathing state based on an established corresponding heart multi-parameter simultaneous quantitative magnetic resonance sequence, and obtaining a magnetic resonance scanning image; and processing to obtain a processed magnetic resonance scanning image. And matching the processed magnetic resonance scanning image with the established dictionary to obtain a parameter chart of the heart tissue of the detected object. By means of the method, the problems that in the prior art, T1, T2, T1 rho and other parameters of the heart tissue cannot be measured at the same time in the free breathing state, and the influence of a non-uniform B1 field on parameter measurement cannot be corrected at the same time can be solved.

The invention relates to the technical field of physiological signal detection. The invention discloses a physiological signal detection method and system oriented to magnetic resonance scanning and a storage medium. The method and system can achieve accurate detection of multi-dimensional physiological parameters in a high-intensity magnetic field environment. The physiological signal detection method for magnetic resonance scanning comprises the following steps: in the process of scanning a patient by magnetic resonance equipment of the physiological signal detection system for magnetic resonance scanning, acquiring a multispectral pulse wave signal of the face of the patient by adopting a time sequence light splitting method; when the multispectral pulse wave signals are obtained, heart vibration signals of the chest of the patient are obtained through a vibration measurement method; preprocessing the multispectral pulse wave signal to obtain a first target signal; preprocessing the heart vibration signal to obtain a second target signal; extracting a physiological signal with a plurality of physiological parameters based on the first target signal and the second target signal; the physiological signals are fed back to medical staff.

The invention discloses a white matter microstructure calculation system and method based on multi-shell diffusion-weighted imaging, and the system comprises a data collection module which is used for obtaining diffusion-weighted imaging and structural image magnetic resonance scanning of a testee; the first data processing module is used for obtaining individual fiber orientation distribution and generating a public template of group-specific fiber orientation distribution at the same time; the second data processing module is used for co-registering the individual fiber orientation distribution diagrams to a common template and segmenting the fiber orientation distribution to obtain white matter microstructure indexes of a whole brain level; the third data processing module is used for obtaining a white matter microstructure index of each anatomical fiber bundle level; and the fourth data processing module is used for obtaining a whole brain fiber streamline based on probabilistic fiber bundle tracking and spherical deconvolution information filtering, and generating a white matter microstructure index of a network level in combination with a prior brain map. By adopting the technical scheme of the invention, quantitative calculation and analysis of the white matter microstructure change of the brain are realized.

The invention discloses an electrocardio gating signal processing device and method used under nuclear magnetic resonance, and belongs to the technical field of nuclear magnetic resonance electrocardio gating processing.The method comprises the steps that an integrated circuit board of physical magnetic shielding collects superposed signals of electrocardio signals and nuclear magnetic noise, and the superposed signals serve as original electrocardio signals after noise filtering and amplification are conducted on the superposed signals in sequence; the method comprises the following steps: performing real-time frequency analysis on an original electrocardiosignal, extracting various electrocardiosignal characteristics, reconstructing a mask vector to filter noise and reconstruct a time-domain R-wave signal, reconstructing an electrocardiosignal based on the reconstructed time-domain R-wave signal and the various electrocardiosignal characteristics, detecting an R-wave trigger point based on the reconstructed electrocardiosignal and generating a gating signal, missed triggering and false triggering detection is carried out on R-wave triggering points in real time; and the reconstructed electrocardiosignal, the gating signal and various electrocardiosignal characteristics are output to a nuclear magnetic resonance system, and matching of different gating trigger conditions based on a magnetic resonance scanning sequence is supported, so that accurate positioning of R waves can be realized.

The utility model relates to a radio frequency coil assembly for magnetic resonance scanning equipment and the magnetic resonance scanning equipment. The radio frequency coil assembly comprises a first coil structure and a second coil structure, the first coil structure can be worn on a scanning part of a detected object, and the size of the first coil structure can be matched with the size of the scanning part, so that the first coil structure is closer to and fits the scanning part, and magnetic resonance signals emitted by tissues can be received more efficiently; a higher image signal-to-noise ratio is obtained; the second coil structure is separated from the first coil structure and surrounds the outer side of the worn first coil structure, and a certain gap is formed between the second coil structure and the first coil structure, that is, the size of the second coil structure can be made to be larger, so that the device can adapt to detected objects with more body types, and the proportion of applicable people is increased; and moreover, the problem of claustrophobia of the detected object can be relieved, the comfort of the detected object is improved, and the use is more convenient.

The invention relates to a gradient-based tactile topology mapping model construction method. The method comprises the steps of obtaining functional imaging data and structural imaging data of magnetic resonance scanning of a testee; constructing a voxel-level functional connection matrix based on a voxel space in the functional imaging data; constructing a vertex-level structure connection matrix based on a cortex space in the structure imaging data; based on a gradient dimension reduction analysis processing method, matrix similarity calculation and dimension reduction analysis are carried out on the function connection matrix and the structure connection matrix, and a plurality of gradient components and variance interpretation quantities are obtained; and on the basis of the variance interpretation quantity, determining a functional main gradient and a second structural gradient, and constructing a tactile topology mapping model in combination with a tactile topology distribution rule. According to the method, the problem that the current tactile perception topological mapping is not accurate is solved, and more accurate mapping of tactile perception and brain activation is realized.

The invention discloses a cartilage calcification layer imaging method and device, equipment and a medium, and relates to the technical field of image processing, and the method comprises the steps: obtaining a to-be-imaged knee joint specimen, carrying out the magnetic resonance scanning of the to-be-imaged knee joint specimen, and obtaining a plurality of to-be-processed images; performing double-echo subtraction processing on the first to-be-processed image and the second to-be-processed image to obtain a target image which contains a cartilage calcification layer represented in a high-signal strip form and meets a preset high-resolution condition, and determining position information and form information of the cartilage calcification layer in the target image; and performing single-index fitting processing on all the to-be-processed images to obtain a target quantitative map, processing the target quantitative map based on the position information and the form information to obtain quantitative information of a cartilage calcification layer, and obtaining a target high-resolution image of the to-be-imaged knee joint specimen based on the quantitative information and the target image. And a high-definition image for clearly displaying the fine structure of the calcified cartilage layer is obtained.

The invention relates to a quick dynamic support control system compatible with magnetic resonance, which is matched with a magnetic resonance scanner to provide enough correction pressure for hard joints of a human body and realize quick and targeted posture adjustment. The core is a dynamic composite pressure support which has the magnetic resonance imaging characteristic, and deformation of the dynamic composite pressure support can be observed under magnetic resonance scanning. The supporter is formed by compounding a plurality of layers of materials and comprises a sealing layer and a magnetic resonance developing layer. The pressure adjusting device adjusts the pressure of the supports through a pneumatic pump and an air valve, rapid adjustment is achieved by pre-inflating the pressure container, and the control system monitors the pressure of the actuator, adjusts pressure distribution among the supports in real time and maintains dynamic balance of the needed pressure. During magnetic resonance scanning, a patient only needs to wear the support to prepare in a magnetic resonance scanner, and a magnetic resonance compatible material pipeline is connected with a pressure adjusting loop for adjustment. The method is widely applied to the fields of medical imaging and treatment, can provide rapid and accurate support pressure adjustment, and optimizes the treatment effect.

The embodiment of the invention provides a magnetic resonance scanning acceleration method, system and device and a storage medium, and the method comprises the steps: obtaining a positioning scanning sequence of heart magnetic resonance scanning, and obtaining a plurality of scanning orientations of magnetic resonance positioning scanning in the positioning scanning sequence based on the positioning scanning sequence; determining a corresponding scanning acceleration multiple based on the scanning orientation of magnetic resonance positioning scanning; and carrying out magnetic resonance automatic sequence scanning on the corresponding scanning orientation by adopting the scanning acceleration multiple, and obtaining a magnetic resonance scanning image corresponding to the scanning orientation in an automatic sequence.

The invention relates to the technical field of magnetic resonance scanning examination, in particular to a noise reduction protection device for magnetic resonance examination, which comprises a first adjusting sound insulation device, a support base, a track plate, a locking fixing groove and a second adjusting sound insulation device, and is characterized in that the track plate is fixedly connected to the upper ends of the two sides of the support base; the locking fixing grooves are formed in the upper portions of the outer side ends of the track plates, and the first adjusting sound insulation device and the second adjusting sound insulation device are arranged on the two track plates correspondingly and are the same in structure. According to the device, the sealing air bag ring is fixedly installed on the edge of the outer side end of the sealing sound insulation cover, so that when the ear part is covered for protection and sound insulation, better attaching and sealing are achieved through extrusion, and the sound insulation effect is better.

The invention provides a cooperative control method and system of a bed moving type magnetic resonance scanning system, a medium, a program and an electronic terminal. According to the end time T0 of a current collection sequence, the bed moving time tij corresponding to each remaining to-be-collected sequence Aij and the predicted waiting time uij of each remaining to-be-collected sequence Aij, the bed moving time tij and the predicted waiting time uij of each remaining to-be-collected sequence Aij are calculated; and selecting a next to-be-executed target acquisition sequence Atarget from the remaining to-be-acquired sequences Aij on the basis of a shortest time principle. The moving process of the scanning bed is arranged to be overlapped with'garbage time 'which is not suitable for collection in the physiological cycle of a patient, so that when a bed body accurately arrives at a target position, the physiological state of the patient is just or is about to enter a corresponding target triggering time phase; the two processes of'bed moving 'and'waiting time phase' which originally must be executed in series are parallelized to the maximum extent, and the scanning efficiency and the equipment throughput are remarkably improved.

For autonomous MR scanning of a given medical test, a simplified MR scanner can be used without or with little input or control by a technical expert, e.g., by a physician, radiologist, or person trained in MR scanner operation. The MR scanner autonomously positions, scans, checks quality, analyzes, and / or outputs answers to diagnostic questions with or without MR images. Artificial intelligence-based scan analysis allows continuous or instant changes to the scan configuration to acquire the data desired to answer the diagnostic question. By using a simplified MR scanner, both the positioning of the patient relative to the MR scanner and the localization of the scan by the MR scanner are jointly solved. Sensors can sense the patient at the scan position, with reduced radio frequency requirements allowing a more open bore.

The fast magnetic resonance imaging method provided by the invention comprises the following steps: periodically scanning a target area containing a focus through a magnetic resonance fast imaging sequence to obtain an initial magnetic resonance image sequence of a target period, the target period being any period of periodically scanning the target area; the initial magnetic resonance image sequence of the target period is corrected according to a reference period, a corrected magnetic resonance image sequence of the target period is obtained, and the reference period is a period in which a reference area containing a focus is scanned by magnetic resonance in advance to obtain a space standard image; according to the rapid magnetic resonance imaging method provided by the invention, the target area containing the focus is scanned through the magnetic resonance rapid imaging sequence, the scanned magnetic resonance image is corrected, distortion generated in the rapid scanning process is eliminated, and the efficiency and precision of magnetic resonance imaging are improved.

The invention relates to a flip angle measurement method, system and device, computer equipment and a storage medium. The method comprises the following steps: acquiring a first echo signal and a second echo signal; constructing a spin echo signal solving model according to the first echo signal; according to the second echo signal and the spin echo signal solving model, constructing a stimulated echo signal solving model; obtaining a target flip angle according to the spin echo signal solving model and the stimulated echo signal solving model; the target flipping angle is a flipping angle obtained by measuring a refocusing pulse flipping angle for performing magnetic resonance scanning on the region of interest. By adopting the method, the real flip angle of the refocusing pulse can be corrected, so that the imaging effect of the magnetic resonance image is improved.

The invention relates to the technical field of reconstructed image anomaly detection, in particular to an image data anomaly point detection and correction method and system based on magnetic resonance fingerprints, and the method comprises the steps: generating a simulation data dictionary containing random anomaly points based on a magnetic resonance scanning plane; obtaining a to-be-detected reconstructed image, extracting a reconstructed image signal evolution curve, and matching the reconstructed image signal evolution curve with the simulation data dictionary to obtain an abnormal point position in the to-be-detected reconstructed image; and correcting the image data according to the positions of the abnormal points in the to-be-detected reconstructed image to obtain a corrected image. According to the method, the scanned and acquired data is matched with the pre-generated data dictionary containing the random abnormal points, so that whether the abnormal points are contained or not can be detected, the abnormal points are corrected, related image artifacts are eliminated, reconstructed image anomaly detection can be realized without an AI model, manpower and material resources are saved, the stability is better, and the detection efficiency is improved. Deployment and implementation can be carried out in magnetic resonance imaging equipment.

The invention relates to a patient somatosensory monitoring system, method, device and equipment. The system comprises a magnetic resonance imaging device used for performing magnetic resonance scanning on a patient; the sensor is used for collecting local somatosensory data of the patient during magnetic resonance scanning in the magnetic resonance imaging equipment; the visual processing unit is used for receiving the local somatosensory data collected by the sensor, and predicting to obtain global somatosensory data according to the local somatosensory data; wherein the type of the local somatosensory data is the same as or different from that of the global somatosensory data; and the display unit is used for receiving the global somatosensory data sent by the visualization processing unit and displaying the global somatosensory data. By adopting the scheme, the arrangement difficulty of the sensor can be reduced.

A magnetic resonance-compatible programmable synchronized photostimulation system includes a main control unit and a stimulation execution unit. The main control unit is located outside the magnetic resonance scanning room, while the stimulation execution unit is located inside the scanning room and consists only of an LED light panel shielded by a magnetic field. The main control unit is configured to: receive photostimulation sequence parameters configured by the user in a modular manner through a graphical interface; receive a scan trigger signal from the magnetic resonance equipment, and automatically control the start and stop of the photostimulation sequence based on the trigger signal using hardware triggering; thereby achieving high-precision time synchronization between photostimulation and magnetic resonance scanning while maintaining magnetic resonance compatibility. This invention solves electromagnetic compatibility issues through a split architecture, achieves millisecond-level synchronization accuracy through hardware TTL triggering, and enhances experimental paradigm flexibility through modular programmable sequences, making it suitable for neuroscience research fields such as functional magnetic resonance imaging.

The application provides a portable magnetic resonance imaging-based brain disease remote diagnosis system, and belongs to the cross field of medical imaging and remote medical treatment.The system comprises a portable magnetic resonance imaging device, a remote data transmission and cooperation network and a remote diagnosis and AI auxiliary workstation; wherein the portable magnetic resonance imaging device is arranged in a primary medical institution, is used for performing standardized scanning on a patient's brain disease under a low-field magnetic field, and acquires brain image data of the patient; the remote data transmission and cooperation network is used for connecting the device end and the diagnosis end, and is used for transmitting the brain image data to the remote diagnosis and AI auxiliary workstation; and the remote diagnosis and AI auxiliary workstation is used for performing brain disease analysis based on the brain image data and generating a structured report, and the report is returned to the primary medical institution.The application combines remote medical treatment and on-site magnetic resonance scanning, optimizes medical resources, and improves diagnosis effect.

The application relates to a positioning correction method, a positioning correction device and a storage medium, wherein the positioning correction method comprises the following steps: acquiring a to-be-detected image; wherein the to-be-detected image is an image generated after positioning failure of a magnetic resonance object in magnetic resonance scanning; performing abnormal positioning analysis on the to-be-detected image to determine an abnormal positioning cause of the magnetic resonance object; and determining and outputting positioning correction information based on the abnormal positioning cause. The positioning correction method can analyze the positioning failure cause, provide a positioning correction scheme, facilitate a user to successfully complete automatic positioning based on the positioning correction information, and thus reduce the operation complexity of the magnetic resonance scanning.

The invention relates to the technical field of magnetic resonance, in particular to a magnetic resonance coil device, a using method thereof and a liquid container used for magnetic resonance scanning imaging. The magnetic resonance coil device comprises a bearing body used for bearing an examined object, and the examined object is an animal; the liquid containing space is used for containing liquid, and the detected part of the detected object is immersed in the liquid; the radio frequency coil is arranged on the outer side of the liquid containing space and used for receiving magnetic resonance signals from the detected part. According to the device, the detected part of the detected object can be subjected to magnetic resonance imaging scanning in a liquid environment instead of an air environment, so that magnetic susceptibility artifacts at the boundary position of the detected part can be inhibited, the quality of a magnetic resonance image is improved, and accurate analysis and research on the detected part are facilitated.

The invention relates to a magnetic resonance scanning method and a scanning control method of a magnetic resonance system. The method comprises the following steps: based on physique information, body position information and a to-be-scanned part of a detected object, searching a target PNS limit value model adaptive to the detected object from a plurality of groups of PNS limit value models; the multiple groups of PNS limit value models are obtained by performing gradient pulse testing on a plurality of prior test objects with different physiques at different body positions and different scanning parts; determining a PNS limit value corresponding to the sequence to be scanned based on the target PNS limit value model; in response to the fact that the PNS predicted value of the sequence to be scanned is not matched with the corresponding PNS limit value, optimizing at least one parameter of the sequence to be scanned; and scanning the to-be-scanned part of the detected object by adopting the optimized scanning sequence. By adopting the method, the gradient performance of the magnetic resonance system can be brought into full play, and the scanning result of magnetic resonance can be improved.

The embodiment of the invention provides a magnetic resonance image-based temperature calculation and magnetic resonance guided laser ablation method, and the method comprises the steps: periodically scanning a target region containing a focus through a magnetic resonance fast imaging sequence, and obtaining an initial magnetic resonance image sequence of a target period, the target period is any period of periodically scanning the target area; the initial magnetic resonance image sequence of the target period is corrected according to a reference period, a corrected magnetic resonance image sequence of the target period is obtained, and the reference period is a period in which a reference area containing a focus is scanned by magnetic resonance in advance to obtain a space standard image; the corrected magnetic resonance image sequence of the target period and the corrected magnetic resonance image sequence of the historical period are used to generate the temperature map of the target period, the historical period is any period before the target period, distortion generated in the rapid scanning process is eliminated, and the accuracy and convenience of temperature monitoring are improved.

1. The name of the design product: the main body of the magnetic resonance monitor trolley. 2. The use of the design product: the whole product is used for real-time monitoring of patient's vital signs during magnetic resonance scanning, and the local part of the product is used for the main body of the magnetic resonance monitor trolley. 3. The design points of the design product: in shape. 4. The picture or photo that best indicates the design points: perspective view. 5. Other circumstances that need to be explained: the design requests partial design protection, the solid line part in the view is the content requested for protection, and the dashed line part is not requested for protection.

The application provides a method and system for removing electro-physiological signal gradient artifacts in a magnetic resonance environment, and relates to the technical field of magnetic resonance image processing. The method comprises: collecting an electro-physiological signal of a magnetic resonance scan and a scan synchronization signal; aligning and windowing the electro-physiological signal based on the scan synchronization signal to obtain a windowed sequence; constructing an artifact template based on the windowed sequence; combining the windowed sequence and the artifact template to calculate a first residual; performing principal component analysis on the artifact template and the first residual to obtain a second residual; performing logarithmic domain conversion and polarity extraction operations on the second residual to obtain a logarithmic domain sequence and a polarity symbol layer; inputting the logarithmic domain sequence into a deep learning denoising network to output a de-artifact logarithmic domain sequence; and performing inverse logarithmic transformation and polarity recovery operations on the de-artifact logarithmic domain sequence and the polarity symbol layer, respectively, to determine a de-artifact signal.

The present application relates to the technical field of internal target area delineation based on 4D magnetic resonance imaging, and discloses a method, apparatus, device, and medium for internal target area delineation based on 4D magnetic resonance imaging. The method comprises: obtaining a first abdominal 4D magnetic resonance image and each second abdominal 4D magnetic resonance image; determining a first probability distribution based on a preset organ reference position and the first abdominal 4D magnetic resonance image, and determining each second probability distribution based on the preset organ reference position and each second abdominal 4D magnetic resonance image; determining a target scan duration based on the first probability distribution and each second probability distribution; performing a 4D magnetic resonance scan on a target object based on the target scan duration, obtaining a target nuclear magnetic resonance image corresponding to the target scan duration, and performing internal target area delineation based on the target nuclear magnetic resonance image. The method can determine an appropriate target scan duration, shorten the 4D magnetic resonance scan duration of the target object, and improve the accuracy of internal target area delineation.

The present application relates to a kind of transcranial electrical stimulation system capable of being used in magnetic resonance environment synchronously.The present application includes electrical stimulation instrument, fluorescent thermometer and nuclear magnetic compatible kit, the electrical stimulation instrument is connected nuclear magnetic compatible kit by first coaxial cable, the nuclear magnetic compatible kit is connected stimulation electrode in nuclear magnetic resonance instrument by second coaxial cable and third coaxial cable, the fluorescent thermometer is connected stimulation electrode in the nuclear magnetic resonance instrument by optical fiber.The present application can be in the process of tDCS stimulation and after stimulation stops to the subject for magnetic resonance scanning, analysis stimulation to brain, functional magnetic resonance imaging (fMRI) technology has higher spatial resolution, can observe the influence of transcranial electrical stimulation to brain in the process and after electrical stimulation, can better study the mechanism of transcranial electrical stimulation;It has important influence to the basic mechanism research of tDCS, simple operation.