13 results about "Breath holds" patented technology

The application provides a radiotherapy breathing control threshold adaptive adjustment method based on image feedback, which comprises the following steps: before any fraction treatment, guiding a patient to perform deep inhalation breath holding, and acquiring chest three-dimensional image data of the patient through an image acquisition device; determining whether a breathing control threshold optimization condition is met based on the chest three-dimensional image data; when the breathing control threshold optimization condition is met, optimizing the breathing control threshold, and determining a new breathing control threshold for triggering radiotherapy beam output. The application uses the real lung volume calculated by three-dimensional image as a feedback variable to adaptively correct the control threshold based on inhaled gas volume in the traditional ABC system, so as to establish a closed-loop breathing control mechanism based on internal anatomical state.

The present application belongs to the technical field of medical ultrasonic signal processing, and specifically relates to a spermatic vein ultrasonic imaging enhancement system and method based on double-wall filtering and adaptive Doppler signal processing. The system comprises a dynamic reconfigurable analog front end, a dual-channel heterogeneous data processing unit and a closed-loop feedback controller. The method extracts fluid dynamics characteristics in real time through an auxiliary path, intelligently identifies resting state and action mutation state. At the action mutation moment, the physical layer automatically switches the analog filtering parameters to prevent signal saturation, and the digital layer adaptively increases the FIR filter weight to eliminate the ringing artifact; in the resting state, the high-gain analog configuration is maintained and the IIR filter is dominated to capture weak signals. With the delay buffer mechanism, accurate timing alignment of control instructions and imaging data is realized. The present application effectively solves the contradiction between low flow rate detection sensitivity and strong tissue motion interference suppression, eliminates the flicker artifact generated by breath holding action, and significantly improves the diagnosis accuracy of weak reflux.

This invention relates to the field of medical device technology, specifically to a fully automatic medical auxiliary breath-holding device, comprising an inflatable pressure abdominal binder and a head support fixation base, as well as an inflatable pressure nasal clip mechanism disposed on the head support fixation base. The head support fixation base also includes a massage mechanism and a main control box containing three sets of air pump assemblies. These three sets of air pump assemblies are respectively connected to the inflatable pressure abdominal binder, the massage mechanism, and the inflatable pressure nasal clip mechanism via three air supply pipes. The main control box is wirelessly connected to a remote control box. This invention solves the problems of existing medical breath-holding auxiliary devices, such as simple functions, insufficient automation and applicability, susceptibility to patient head movements affecting breath-holding effectiveness, low success rate and poor image quality for some patients with poor cooperation, time-consuming and laborious procedures, and inability to alleviate patient anxiety during examinations, which can affect breath-holding duration and effectiveness.

This invention discloses a low-pass filtered non-breath-hold saline angiography combined with cardiac mirror contrast imaging for lung perfusion imaging, belonging to the field of medical imaging technology. The method includes the following steps: S1: determining whether the subject's tidal impedance variation meets the imaging criteria; S2: injecting contrast agent into the subject to perform angiography; S3: obtaining an impedance decrease signal; S4: combining cardiac mirror contrast imaging with lung perfusion images. This invention solves the problem of low success rate of saline angiography in existing technologies, achieves separation of thoracic impedance caused by tidal breathing and thoracic impedance caused by saline angiography, reduces the influence of the cardiac region on lung perfusion images, further improves the accuracy of lung perfusion imaging, greatly reduces the interference of breath-holding on respiratory circulation, improves the simplicity of clinical application, and expands clinical application scenarios.

Disclosed in the present invention are a motion management method and system, and a related device, which relate to the technical field of radiotherapy. The system comprises: a real-time imaging module used for acquiring a body surface contour of a patient in real time and acquiring a respiratory curve of the patient according to the body surface contour, the body surface contour being used for auxiliary positioning of the patient; and a 4D acquisition module used for sending a time signal to a sliding gantry CT according to the respiratory curve of the patient to establish a respiratory phase synchronization timing sequence, wherein when a treatment couch is at a scanning position of the sliding gantry CT, according to a real-time respiratory signal of the patient, 4DCT images or breath-hold images of the patient in different respiratory phases are acquired using the sliding gantry CT. The 4DCT images or the breath-hold images are used for registration with a positioned 4DCT image, thereby overcoming the drawbacks that previously only tumor images at a certain respiratory phase are obtainable and the images are prone to motion artifacts, resulting in errors in registration. As a result, the registration accuracy of a tumor that is greatly affected by respiratory motion is improved, and the clinical efficiency is enhanced.

The present application relates to a kind of cardiac magnetic resonance longitudinal relaxation time measurement method, medium and equipment.The measurement method includes the following steps: S1 uses MOLLI sequence respectively before and after scanning contrast;Specifically, in the before and after scanning contrast, by setting different initial inversion time TI, setting 3 groups of LL experiment LL1, LL2, LL3 triggered by continuous ECG, enough relaxation curve sampling points are obtained after fusion;And data is collected at the end of diastole of cardiac cycle, and 1 image is obtained per heartbeat;S2 image processing.This measurement method can realize single-pixel high-resolution T1 mapping under the breath holding of selection data acquisition and multi-LL experiment data fusion, give consideration to high accuracy, high resolution and high efficiency, and have good compatibility and practicality, provide new scheme for early diagnosis of heart disease, lesion quantification and prognosis evaluation, have wide clinical application prospect.

The present application relates to magnetic resonance examination device technical field, specifically to a kind of cardiac magnetic resonance examination device, including fixed plate and electrocardiogram control patch, fixed plate is equipped with chest coil;Fixed plate is detachably connected with detection plate, detection plate is equipped with breathing training component for exerting chest pressure, breathing training component is electrically connected with control panel;Control panel records and draws fluctuation curve based on the pressure data detected by breathing training component, then obtains the breathing interval of patient based on fluctuation curve, sends breath-holding reminding instruction to voice module according to breathing interval;Detection plate side away from fixed plate is equipped with several electrocardiogram monitoring electrode pieces for detecting the quality of heart beat signal strength, detection plate is equipped with driving mechanism for driving electrocardiogram monitoring electrode piece to move in range;The present application is used to assist patient breathing breath control, realize the accurate matching of patient breathing breath opportunity and imaging sequence, reduce the generation of breathing artifact, guarantee the progress of cardiac magnetic resonance.

This invention discloses a 4D-CT-based method for visualizing lung perfusion, belonging to the field of intelligent medical technology. The method includes: acquiring 4D-CT scan data of a patient's lungs; acquiring the patient's cardiac waveform based on the scan data; acquiring the patient's lung waveform based on the scan data; performing correlation analysis on the cardiac and lung waveforms to obtain a correlation coefficient; and outputting a time-series color image of lung perfusion based on the correlation coefficient. This invention can directly utilize conventional breath-hold 4D-CT volumetric data, intuitively presenting the propagation characteristics of lung perfusion without the need for additional hardware or examination procedures. This method does not require the injection of contrast agents, completely avoiding the risks associated with contrast agents, and has better safety and repeatability. Furthermore, the overall calculation process is highly automated and has a short detection time, improving examination and evaluation efficiency to a certain extent.

The present application relates to the field of virtual reality, in particular to a lung rehabilitation nursing psychological counseling method and system based on virtual reality. The method collects the chest and abdominal girth change signal of the patient, calculates the respiratory flow rate curve through band pass filtering and peak detection algorithm, identifies the inspiration starting point, expiration starting point and breath holding starting point on the respiratory flow rate curve as the respiratory phase turning point. The digital phase-locked loop mechanism is introduced, the respiratory phase turning point is taken as the reference clock signal, the actual presentation time of the virtual visual and auditory stimulation is taken as the output signal of the voltage-controlled oscillator, the rendering pipeline delay of the visual and auditory generation component is adjusted through closed-loop feedback, so that the phase delay of the virtual visual and auditory stimulation is constantly within the preset neuromuscular response threshold. The present application eliminates the phase lag and drift phenomenon between the audio-visual guide signal and the real breathing action of the patient, and enhances the neural drive synchronization of the diaphragm and auxiliary respiratory muscles under the rhythmic audio-visual stimulation.

The present invention discloses a system and method for identifying phases of breathing activity and managing exercises. The system includes a wearable device configured to capture physiological data of user comprising acoustic sound signals associated with inhalation, exhalation, and breath holding, and inertial measurement unit (IMU) data including accelerometer, gyroscope, and magnetometer data. A database stores user data and trained models, including probabilistic breath phase, breath phase transition, posture, and stability models. A computing device, in network communication with the wearable device and the database, executes program modules to receive the physiological data, preprocess the sound and motion data from physiological data, and extract features therefrom. The sound data are processed into Mel-frequency cepstral coefficient features, and the motion data are processed into slope-based features. Using these features, the system predicts breath phases in real time, segments individual breath cycles, and determines transitions between inhalation, holding, and exhalation

The disclosure relates to a method for generating MR images of a heart of a patient. The method may include selecting first 3D MR datasets acquired at a first breath hold of the patient over a plurality of cardiac phases and selecting second 3D MR datasets acquired at a second breath hold over several cardiac phases. A first combined MR dataset may be generated based on the first 3D MR datasets at the first breath hold, and a second combined MR dataset may be generated based on the second 3D MR datasets at the second breath hold. Motion information for the heart between the first and second breath hold may be determined based on the first and second combined MR datasets. For the plurality of cardiac phases, MR images of the heart may be reconstructed based on the first 3D MR datasets, motion information, and second 3D MR datasets.

Method for acquiring magnetic resonance data of a target area of ​​a patient moving during respiration using a magnetic resonance device (1), wherein an optical camera (5) arranged in a patient recording of the magnetic resonance device (1) and directed towards the patient is used, wherein image data of the patient acquired by the camera (5) before and / or during the acquisition of the magnetic resonance data are evaluated to obtain respiratory information describing the respiratory state, characterized in that the respiratory information is used to trigger and / or correct movement and / or assess a breath-holding process of a patient, wherein a message is issued to an operator when an interrupted breath-holding process is detected during the acquisition of magnetic resonance data.

This invention discloses a method and apparatus for real-time estimation of ventilator leakage flow based on pressure equal point pairs, relating to the field of medical device technology. The method includes: acquiring breath-hold point data and the total number g of leakage model parameters during the respiratory cycle; constructing g multivariate linear equations using the breath-hold point data and calculating g leakage model parameters; if the number of breath-hold points w is less than g, then constructing w multivariate linear equations using the data from w breath-hold points and calculating w leakage model parameters; and constructing n multivariate linear equations using point pairs of points with equal pressure during the inspiratory and expiratory phases of the respiratory cycle and calculating n leakage model parameters; and calculating the leakage flow using the g leakage model parameters. This invention can perform leakage compensation in real-time, breath-by-breath during the patient's normal breathing; it can adapt to various complex leakage situations, improving compensation accuracy; it has low computational load, a stable and reliable algorithm, and high robustness.