31 results about "Cardiac ratio" patented technology

Catheterization of the heart is carried out by inserting a probe having electrodes into a heart of a living subject, recording a bipolar electrogram and a unipolar electrogram from one of the electrodes at a location in the heart, and defining a window of interest wherein a rate of change in a potential of the bipolar electrogram exceeds a predetermined value. An annotation is established in the unipolar electrogram, wherein the annotation denotes a maximum rate of change in a potential of the unipolar electrogram within the window of interest. A quality value is assigned to the annotation, and a 3-dimensional map is generated of a portion of the heart that includes the annotation and the quality value thereof.

An X-ray computed tomography apparatus includes an X-ray source, a high voltage generating unit, an X-ray detector detecting X-rays transmitted through a subject to generate projection data, a storage unit storing the projection data in association with electrocardiographic data of the subject, a setting unit setting a specific cardiac phase in accordance with an operator's instruction, a reconstruction unit reconstructing a tomogram based on projection data sets acquired in specific periods centered on the specific cardiac phase throughout cardiac cycles, a period extending unit extending the specific period on the basis of a heart rate fluctuation range of the subject, and a control unit controlling the high voltage generating unit to generate a relatively high dose of X-rays in the extended specific period and generate a relatively low dose of X-rays in a period other than the extended specific period.

The invention discloses a ventricular ectopic beat detection method based on a 1D (Dimension) convolutional neural network. As the convolutional neural network is generally applied to the aspect of two-dimensional image processing and an electrocardiosignal belongs to a one-dimensional time sequence, the invention designs a one-dimensional convolutional neural network used for detecting ventricular ectopic beats specific to the characteristics of the electrocardiosignal; meanwhile, the invention gives specific partition parameters on the electrocardiosignal specific to the characteristics of the electrocardiosignal, and a series of single cardiac beat data obtained by partitioning a cardiac arrhythmias database is input a specially designed one-dimensional convolutional neural network to be trained. Compared with the past method, the ventricular ectopic beat detection method disclosed by the invention has stronger robustness and higher detection precision.

In a processing section 4, allowable gain-value range defining unit 41 measures a gain value k corresponding to a level ratio between an MPP signal and an SPP signal generated by a tracking error signal generating circuit 3 to define an allowable range of the gain value, and eccentricity measuring unit 42 measures an eccentricity of an optical disk. If the eccentricity is determined to be greater than or equal to a predetermined value by eccentricity determining unit 43, gain-value defining unit 44 selects a minimum value of the gain value k to define the minimum value as a gain value k of an amplifier 37. On the other hand, if the eccentricity is determined to be less than the predetermined value, the gain-value defining unit 44 selects a central value of the gain value k to define the central value as the gain value k of the amplifier 37.

The invention relates to a joint control method of position maintenance and angular momentum unloading of synchronous orbit electric propulsion, comprising: determining the position maintenance period Ts, the control period Tc and the orbit measurement time Tm; The total time; the orbit measurement time Tm is obtained by rounding up the time required for orbit measurement to an integer number of orbit periods; a position keeping period Ts should include an orbit measurement process Tm and several control periods Tc: before the start of each position keeping period Ts , to calculate the control quantities of orbital elements in each control period: inclination control quantity vector (Δix, Δiy), eccentricity control quantity vector (Δex, Δey) and longitude drift rate control quantity ΔD; determine the electric thruster ignition parameters for each control period , the ignition parameters include ignition duration and ignition position; before the start of each control cycle Tc, the rotation angle of the electric thruster is determined according to the ignition parameters of the electric thruster and the angular momentum unloading amount.

A method to provide electrical stimulation therapy to stabilize ventricular rate of a heart during episodes of atrial fibrillation. The stimulation therapy may be a plurality of stimulation pulses delivered to the AV node during the AV node refractory period following the sensing of an atrial event.

The invention is suitable for the technical field of medical signal processing, and provides a method and a device for outputting parameters of a fetal heart rate curve. The method comprises the following steps of according to an original signal collected by fetal heart monitoring equipment, generating the fetal heart rate curve; extracting the fetal heart rate curve within a specified period of time; measuring the wave peak / wave trough parameters of the fetal heart rate curve within the specified period of time; simultaneously outputting the fetal heart rate curve and the measured wave peak / wave trough parameters. The method has the advantage that the wave peaks / wave troughs in the fetal heart rate curve can be accurately identified, so the outputted fetal heart rate curve can visually and correctly display the fetal heart rate acceleration and deceleration conditions, and a medical staff can conveniently and accurately perform identification according to the outputted fetal heart rate curve, and the identifying accuracy is improved.

The invention discloses a baseline identification method for a fetal heart rate curve. A device for implementing the method comprises a signal input detecting module, a baseline identification extracting module, a baseline value parameter calculating module and a baseline value parameter output module. The method comprises the following steps: first, inputting fetal heart rate signals, performing pre-calculation, average optimization and interpolation smoothing in the baseline identification extracting module through pre-treatment and extraction of the effective signals, and calculating a baseline value; then, calculating the baseline proportion in a range and descriptive statistical parameters in a parameter calculating module; finally, outputting the calculating result in the baseline value parameter output module. The baseline value is calculated according to fetal heart rate data of long-term fetal heart rate monitoring and the definition of a fetal heart rate baseline, and has a relatively specific physiological significance; through combination of accelerating, decelerating and variance classifications, counts and duration proportions of the fetal heart rate, more comprehensive information can be obtained from the fetal heart rate signals; through application of the extracted baseline valve, the frequency domain of the fetal heart rate and related entropy information can also be obtained.

The invention relates to a method and device for adjusting a fetal heart and uterine contraction monitoring curve alarm range. The method for adjusting the fetal heart and uterine contraction monitoring curve alarm range comprises the following steps of: setting a fetal heart rate alarm range; judging whether the set fetal heart rate alarm range is the same as a default fetal heart rate alarm range or not; judging whether the set fetal heart rate alarm range is within the set safe fetal heart rate range of a system; automatically adjusting the fetal heart rate alarm range; and displaying the fetal heart rate alarm range and printing a fetal heart rate curve. The method and device for adjusting the fetal heart and uterine contraction monitoring curve alarm range has the advantages that the needs of monitoring the fetal heart rate of a fetus at different periods in different areas can be satisfied, the risk caused by misoperation of a doctor during fetus monitoring is avoided and the reliability and the safety of the product are improved.

A method is provided for determining current eccentricity of a rotating rotor which is equipped with a phase marker scanned at constant speed of rotation up to 500 rpm by a sensor of a phase marker at the point of the phase marker, and outside of the phase marker by at least one sensor of relative rotor vibrations, while after digitizing the signals of the sensors, estimates current position of the phasor of the 1st harmonic component of signal of the sensor of relative rotor vibrations in the complex plane, which is subsequently compared to a reference position of the phasor of the 1st harmonic component, which has been determined in advance, whereas the variation vector of the phasors is an image of eccentricity of the rotor. Further, a method of diagnostics of eccentricity of a rotating rotor is based on this method for determining current eccentricity.