18results about How to "Reduce Motion Artifacts" patented technology

The invention provides a magnetic resonance gating method and device based on a laser speckle image, a terminal and a medium, and particularly relates to the technical field of image processing and physiological monitoring, and the method comprises the steps: collecting a defocus interference speckle image sequence of a heart under the irradiation of a laser lamp within a preset time period through a single camera based on a preset space-time mapping model; based on the out-of-focus interference speckle image sequence, obtaining a composite motion signal of the heart; based on the composite motion signal, determining a time sequence phase characteristic of the heart; and in response to the detected time sequence phase characteristics, extracting a heart vibration signal and a respiratory movement signal by using a preset gating strategy. The novel composite gating strategy provided by the scheme only depends on a single out-of-focus camera, has the advantages of being non-contact, high in precision and robust to disturbance caused by a magnetic field, can simplify the magnetic resonance process, provides more comfortable use experience, and can effectively eliminate breathing and heart motion artifacts existing in the magnetic resonance imaging process.

The application discloses a liquid metal-based shape-insensitive flexible conductive fabric and a preparation method and application thereof. The preparation method comprises the following steps: preparing a thermoplastic polyurethane elastomer (TPU) fiber pad and a liquid metal (LM) microsphere solution; uniformly depositing and trapping the LM microspheres in the pores of the TPU fiber pad through vacuum filtration; and hot-pressing the TPU fiber pad filled with the LM microspheres to make the LM microspheres break and fuse, so that a continuous conductive path is formed, and a flexible conductive fabric is obtained. The conductive fabric takes the TPU fiber pad as a flexible skeleton, and provides good deformation and recovery capacity; the LM is a conductive filler, and has excellent conductivity and fluidity. When various deformations such as stretching, bending, compression and twisting occur, the LM can deform synchronously with the TPU fiber skeleton and does not leak, and has good shape-insensitive conductivity. The conductive fabric can be applied to the fields of flexible high-conductive electrodes, flexible circuits, electromyographic signal monitoring, electrocardiographic signal monitoring and heat management.

The invention provides CT equipment with a breathing machine. The CT equipment comprises a CT scanner, the breathing machine and a bed body. A scanning hollow part is arranged in the middle of the CT scanner, a transmission seat is fixedly arranged at the front bottom end of the CT scanner, a breathing machine is movably connected to the transmission seat and provided with a telescopic air pipe, a bed body is fixedly arranged on the breathing machine and corresponds to the scanning hollow part of the CT scanner, a transmission mechanism is arranged in the transmission seat, and the transmission mechanism is in transmission connection with the breathing machine. And the CT scanner is electrically connected with the breathing machine. According to the invention, the CT scanner and the breathing machine are arranged as an integrated device, and the breathing machine can automatically control the breathing pressure and frequency of the pet according to the operation of the CT scanner, so that the pet can make the corresponding breathing pressure and frequency to comply with the scanning detection of the CT scanner; the pet breathing control system has the advantages of stably controlling pet breathing, reducing motion artifacts caused by pet breathing motion during CT scanning, being capable of improving pet safety, being convenient to use and efficient in operation and the like.

The utility model discloses an array type myoelectricity electrode patch which comprises a substrate, a plurality of sensing electrodes fixed on the substrate and an electrode interface, a plurality of wires connected with the sensing electrodes are arranged on the substrate, and each sensing electrode is connected with the electrode interface through one wire; the conducting wire comprises a first conducting layer, a second conducting layer and a damping layer from inside to outside, the second conducting layer comprises a sensing area and a non-sensing area, the sensing area is connected with the bottom of the sensing electrode, and the damping layer is tightly attached to the outer side of the non-sensing area. According to the utility model, the outer side of the wire is provided with the damping layer which is tightly attached to the outer side of the wire, so that impact force generated by rapid movement or vibration can be absorbed and relieved, the arrangement of the damping layer is helpful for stabilizing an interface between sensing equipment and skin, and movement interference caused by muscle pulling can be reduced during signal acquisition, thereby reducing errors.

The present invention provides a flat-panel CT machine, including a ray emitter and a flat-panel detector, which adopts 360° scanning or 180° scanning. The flat-panel detector uses a larger length and width than the flat-panel detector used for DSA, can cover a single part of the human body, and no longer needs spiral scanning; the scanning time is greatly reduced, which can effectively reduce motion artifacts; the radiation dose of the patient is greatly reduced; the spatial resolution and the number of longitudinal scanning layers are greatly improved, and it is a gapless scanning. The pulse control technology of X-ray emission is adopted to make the data obtained by the CT machine complete and without missing, and the image is clearer. Through pulse control technology or 180° scanning mode, the scanning frequency is reduced by half; pulse control technology can reduce the requirement for the mobility of the detector thin film transistor by about 10 times; by redesigning the number of detector array elements to further reduce the frequency, and control the inverter frequency of the ray emitter within an achievable range, the CT machine has the possibility of practical application.

This invention discloses an indoor mid-to-long-range camera heart rate detection method and system with resistance to environmental interference. The host computer acquires one video stream from each camera to determine the video frame sequence of the current optimal viewing angle. Face detection, tracking, and ROI localization are performed on the video frame sequence to obtain the face ROI region for each video frame. Rigid motion noise filtering is applied to the video frame sequence to obtain an aligned frame sequence and a reference frame sequence. The face ROI region of each aligned frame is determined based on the face ROI region of the reference frame. The ROI signal is determined based on the face ROI region of the aligned frame, and non-rigid noise is filtered out to obtain a pulse wave signal. The heart rate value corresponding to the current sliding window is determined based on the pulse wave signal, and a corresponding quality score is determined. This, combined with a preset correspondence between distance and available focal length, allows for adaptive adjustment of the camera focal length. This invention exhibits high robustness, accuracy, and stability.

The invention discloses an ultra-micro vessel visual imaging method. The method comprises the following steps: acquiring B-mode radio frequency data of an ultrasonic contrast agent; detecting contrast agent microbubbles in each frame of radio frequency data; removing motion artifacts in the data; describing the microbubbles by adopting a proper mathematical model; calculating the moving speed of the microbubbles between two adjacent frames of data, and generating a microbubble moving speed curve; and generating a corresponding index image according to the ultra-capillary related index and displaying the index image in the form of an image. The B-mode radio frequency data of the ultrasonic contrast agent is acquired, and the contrast agent microbubbles are detected by adopting a filtering means, so that noise and tissue clutter interference can be removed according to the dynamic characteristics of the input signal. For example, a space-time adaptive filter is adopted to firstly remove random noise in a space domain and then remove tissue clutters with low dynamic nature in a time dimension, so that a contrast agent microbubble signal is effectively separated from a complex signal, the image contrast is improved, and the structure of an ultra-microvessel can be displayed more clearly.

The utility model discloses a wrist joint examination positioner which comprises a supporting part, and a lifting part is arranged on one side of the supporting part. The height of the lifting part is greater than that of the supporting part; a fixing frame is further arranged on the lifting part. And the fixing frame is U-shaped. After the palm of the patient is placed on the fixing frame and the elbow of the patient is located on the supporting part, the hand of the patient presents a high-wrist and low-elbow layout. The open type structure has good adaptability to obese, thin and weak patients or patients with plaster external fixing devices. Meanwhile, due to the design that the front portion is high and the rear portion is low, the comfortable experience of the patient in the posture placing process is improved, motion artifacts are reduced, the examination time is shortened, meanwhile, the examination quality can be improved, and based on the design, the examination bed is worthy of application and popularization.

The present invention provides a breast coupling, fixing and shaping device and method for breast ultrasound imaging, which belongs to the field of ultrasound imaging. In the device, the SGCA inner ring coupling agent shapes the breast into a circle concentric with the annular array transducer on the coronal plane at each depth, and limits the slope of breast skin sagging on the sagittal plane and the transverse plane; the inner ring support table is used to support the SGCA inner ring coupling agent, and to pull the breast to be fixed and shaped in the SGCA inner ring coupling agent; the SGCA inner ring coupling agent and the SGCA outer ring coupling agent are used for coupling between the breast and the annular array transducer; the annular array transducer is used for ultrasound scanning and imaging of the breast. The present invention solves the problems that the use of degassed water coupling for scanning results in a long preparation time that affects the inspection throughput, the slight movement of the breast during scanning will form motion artifacts on the image, and the different shapes of the breasts result in poor scanning effects.

The present application relates to the field of magnetic resonance imaging technology. The present application discloses a magnetic resonance image rearrangement method, system and storage medium, which can improve the quality of magnetic resonance imaging. The method includes acquiring a PPG signal of the face; acquiring an SCG signal of the heart while acquiring the PPG signal; taking the time point corresponding to the positive peak value of each cycle in the SCG signal as the first trigger point; generating a corresponding first trigger signal based on each first trigger point, and sending all the first trigger signals to the magnetic resonance device to trigger it to perform an image acquisition operation to obtain multiple initial images; performing compensation calculation on the abnormal positive peak value in the SCG signal based on the PPG signal and the individual model to obtain at least one second trigger point; generating a corresponding second trigger signal based on all the first trigger points and all the second trigger points, and sending all the second trigger signals to the magnetic resonance device to trigger it to perform a rearrangement operation on the multiple initial images to obtain a target image set.

A hearing device is disclosed. The hearing device comprises a memory, an interface, a processor, and one or more sensors, where the processor is configured to: obtain, such as receive and / or retrieve, sensor data from the one or more sensors; determining, based on the sensor data, a health parameter indicative, for example, of a cognitive state of a user of the hearing device; and optionally determining whether the health parameter satisfies, for example, a first criterion indicative of cognitive decline. The processor is configured to output a health representation associated with the cognitive state, e.g., via the interface, in accordance with a health parameter satisfying a first criterion.

The invention provides a novel fixing device for mouse brain imaging. The novel fixing device comprises a first fixing assembly, the bottom of the first fixing assembly is connected with an adjusting platform, the bottom of the adjusting platform is connected with a mounting bottom plate, a second fixing assembly is arranged on the mounting bottom plate, and one end of the second fixing assembly is close to the first fixing assembly; the first fixing assembly comprises an inverted-T-shaped plate, the inverted-T-shaped plate is installed at the top of the adjusting platform, two supporting cylinders are symmetrically arranged at the positions, close to the second fixing assembly, of the inverted-T-shaped plate, the top of each supporting cylinder is movably connected with a first connecting plate, a brain fixing piece is connected between the two first connecting plates, and the brain fixing piece is fixed to the head of a mouse. A positioning hole is formed in the brain fixing piece and used for positioning a window area for mouse brain imaging. According to the device, the stress reaction of the mouse in the experiment process is relieved, the reliability and repeatability of the experiment are improved, the absolute stability of the mouse in a waking state is ensured, and the accuracy of experiment data is effectively improved.

The invention provides transcranial electrical stimulation equipment, and particularly relates to the technical field of brain-computer interfaces, and the equipment comprises an electrical stimulation electrode array which is used for carrying out transcranial electrical stimulation and electroencephalogram signal collection on a target stimulation object; the electrical stimulation electrode array comprises a plurality of electrodes, and each electrode is provided with an electrode contact; each electrode contact is covered with an interface modification layer, the interface modification layer comprises a first hydrogel layer and a second hydrogel layer which are stacked in sequence, the first hydrogel layer is attached to the electrode contact, and the second hydrogel layer is used for making contact with the target stimulation object; the modulus of the first hydrogel layer is higher than that of the second hydrogel layer; the electrical stimulation control element is connected with the electrical stimulation electrode array and used for controlling current output of the electrical stimulation electrode array according to the electroencephalogram signals collected by the electrical stimulation electrode array. The quality and reliability of the electroencephalogram signals are improved.

The present application relates to the field of machine vision defect detection, and discloses a COF substrate ink defect visual detection and analysis system, which comprises a topology prior module for calculating a linear polarization degree matrix and generating a topology mask matrix in combination with a CAD drawing; a variable-frequency projection module for giving high-frequency parameters and low-frequency parameters to high and low reflection areas respectively based on the topology mask matrix, and generating a fringe sequence; a collection and demodulation module for acquiring a polarization image by projecting the fringe sequence, processing light intensity values and extracting an alternating current matrix; a characteristic tensor module for calculating a polarization matrix and a frequency-variable depolarization rate, generating a weight matrix based on the topology mask matrix, and fusing and constructing a descriptor tensor; and a defect classification module for searching the descriptor tensor to extract surface-type and internal-type defects, combining the weight matrix to extract penetrating defects and outputting labels. The present application blocks bottom metal reflection crosstalk through spatial frequency adaptive modulation, fuses multi-dimensional physical parameters and prior weights to remove interference artifacts, and realizes accurate classification of cross-layer defects of composite substrates.

The present invention relates to a method of reconstructing an image of a patient's heart using a magnetic resonance imaging apparatus (MRI 1) generating a magnetic field, the method comprising: acquiring electrical activity of the patient's heart; generating an MRI sequence and collecting a 2D dark blood image; generating an MRI sequence and collecting a 2D bright blood image; applying a non-rigid registration algorithm to each subset of the dark blood image of each profile of the heart; applying a non-rigid registration algorithm to each subset of the bright blood image of each profile of the heart; a set of 2D images is generated for each profile, each image corresponding to a combination generated between each pair of dark and bright blood images.

The invention provides an integrated clinostatism dental diagnosis system, which belongs to the technical field of dental diagnosis, and comprises a dental chair, the dental chair adopts a horizontal structure to realize stable lying and positioning of a patient; the diagnosis module is used for acquiring the image data to determine the disease cause of the patient; the diagnosis module comprises a control device, a high-voltage generator in communication connection with the control device, and an X-ray tube head used for controlling to release X-rays for shooting after the high-voltage generator receives a signal of the control device; the interlocking device is used for controlling the dental chair and the diagnosis module to be locked in an alternative mode; according to the system, patients with limited body functions can conveniently see a doctor, motion artifacts are reduced, the system has the advantages of being high in universality and low in cost, meanwhile, instant film reading is achieved through rich interfaces, the diagnosis efficiency is improved, integration of dental clinostatism shooting and diagnosis and treatment is achieved through combination of the diagnosis module and the interlocking device, and the diagnosis and treatment efficiency is improved. And a more efficient, convenient and safe diagnosis and treatment solution is provided for dental clinics.

The application provides a method for preparing an ultrasonic transducer for transparent rigid piezoelectric material. The method first cuts from the piezoelectric layer side of the piezoelectric wafer with a transparent matching layer, leaving a certain thin layer without cutting through completely, to provide overall mechanical support and ensure that the array elements are arranged at a predetermined interval. Then, a transparent organic elastic material is injected into the array element gap, and the support after solidification further fixes the array element position to realize precise bonding of high-density array elements and flexible circuit electrodes. In the subsequent cutting through of the remaining thin layer, the array elements are effectively supported by the transparent elastic material and are not easily damaged, thereby significantly improving the process reliability and array element yield. The method effectively protects the brittle piezoelectric material and supports the manufacture of high-density, large-array flexible arrays. The obtained device realizes high flexibility with the aid of the transparent elastic material in the array element gap and the flexible circuit; and high sensitivity ultrasonic performance is obtained through the design of the double-layer matching layer and the backing.

The invention provides a CT interlocking system and method, electronic equipment, a storage medium and a program product, and relates to the technical field of dental treatment.The CT interlocking system comprises an in-place sensor, an anti-collision sensor, a control circuit board and a communication module. Through cooperative work of the in-place sensor, the anti-collision sensor, the control circuit board and the communication module, the dental imaging equipment in the prior art can be conveniently interlocked and matched with dental chairs of any brand, the occupied space of the equipment is saved, the purchase cost of the equipment is reduced, and the practicability of the equipment is improved. The adaptability and universality of the dental imaging equipment are improved, the functions of accurately detecting the position of the dental chair, monitoring the distance between the C-shaped arm and the dental chair or a patient in real time, automatically controlling the diagnosis module and the dental chair and the like can be achieved, and the functions can improve the shooting quality of the dental CBCT, guarantee the safety of the patient and improve the working efficiency.