Matches 51 - 100 out of 150 < 1 2 3 >
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5840039 Method and apparatus in connection with measuring the heartbeat rate of a person  
The present invention relates to a method and apparatus in connection with measuring the heartbeat rate of a person. In the method, the ECG signal of the person and the timing moment of at least...
5779645 System and method for waveform morphology comparison  
A ventricular tachycardia (VT) complex is distinguished from a sinus tachycardia or a supraventricular tachycardia. A template based on morphology of a normal sinus rhythm is collected. A test...
5718242 Cardiac arrhythmia detection system for an implantable stimulation device and method  
A cardiac event and arrhythmia detection system and method detects arrhythmic cardiac activity or other information from an electrogram signal of a heart. The system senses the electrogram signal...
5709215 R-wave detection method for implantable cardioverter defibrillators  
An ICD detection method for sensing the occurrence of an R-wave improves the ability to distinguish R-waves from noise through the use of variable declining sensitivity thresholds. The method...
5682902 ECG pace pulse detection and processing  
A flexible ECG monitoring system including pace pulse detection. The monitoring system includes a potable monitor 102 that can be worn by a patient 120 or connected to a docking station 104. The...
5682901 Method and apparatus for measuring autonomic activity of a patient  
A method and apparatus for measuring activity of the autonomic nervous system of a patient involves obtaining ECG signals form the patient while the patient is at rest, measuring the R-R intervals...
5682900 Method and apparatus for obtaining heartbeat measurements from a ECG waveform  
A method and apparatus for obtaining heartbeat measurements obtains ECG data from a plurality of ECG waveforms, which are in turn obtained from signals received from a plurality of ECG electrodes....
5683425 Heart pacemaker with improved detection of electrical signals  
A heart pacemaker with improved detection of electrical signals which are used for triggering pacemaker functions, has a detection circuit for registering intracardial heart signals in which...
5623937 Artifact detector for stimulator  
An object of the present device is to precisely lock the output of electrical stimulation pulses onto diastolic periods. An electrical stimulator comprises a pulse sensor, a systolic period pulse...
5622178 System and method for dynamically displaying cardiac interval data using scatter-plots  
A system and method for the dynamic display of scatter-plot data uses a color monitor or gray-scale monitor to indicate the relative frequency of occurrences of interval pairs corresponding to the...
5603321 Artifact removal from physiological signals  
A measured magnetocardiography signal has a relatively small heart signal mixed with a large noise signal. To produce a heart signal having a reduced noise content, the times of occurrence of a...
5564430 Automatic control of the sensing threshold for monitoring cardiac rhythm in a implantable device  
An improved automatic sensing threshold control for cardiac rhythm detection in an implantable device. The improvement includes setting the sensing threshold according to the amplitude of both...
5560370 Method and apparatus for prediction of cardiac electrical instability by simultaneous assessment of T-wave alternans and QT interval dispersion  
A method and apparatus for predicting cardiac electrical instability simultaneously assesses T-Wave Alternans and QT Interval Dispersion. T-wave alternation is an excellent predictor of cardiac...
5560368 Methodology for automated QT variability measurement  
A method for analyzing electrocardiograph signals to determine risk of malignant arrhythmias, that involves: sensing fluctuations in voltage resulting from electrical activity of a heart over a...
5526813 Method and apparatus for heart beat synchronous nuclear magnetic resonance imaging  
A method and an apparatus for heart beat synchronous nuclear magnetic resonance imaging capable of improving the quality of the nuclear magnetic resonance images synchronous with the heart beat by...
5513638 Method of collecting image data of MRI and magnetic resonance imaging apparatus  
In an method of collecting image data in magnetic resonance imaging, a sequential order for collecting image data of the plurality of sliced planes including a most clinically important sliced...
5492123 Diffusion weighted magnetic resonance imaging  
The present invention relates to the use of diffusion weighted magnetic resonance imaging procedures for the diagnosis of conditions in which blood circulation or similar molecular displacements...
RE35122 Method and apparatus for detecting optical pulses  
A method and apparatus for improving the calculation of oxygen saturation and other blood constituents by non-invasive pulse oximeters. The method and apparatus permit more accurate determination...
5477144 Method for reducing image artifacts in magnetic resonance images acquired with synchronization to physiological cycles  
A method for removing image artifacts in MRI created when data acquisition is synchronized to a physiological and therefore uneven intervals. The method simultaneously records both image data from...
5474067 Method for time-resolved MR-imaging  
For time-resolved MR imaging, magnetic resonance signals obtained from a subject are entered row-by-row into a raw data matrix divided into individual segments, the signals being acquired by...
5458115 Detector for sensing events in living tissue  
A detector for sensing events in living tissue, such as electrical events in a heart, contains a microprocessor functioning as comparator which compares an input signal corresponding to electrical...
5456263 Detector for detecting heart depolarizations  
A compact, power-sparing detector for detecting heart polarizations is described. The detector has a first operational amplifier which uses sensed heart signals from a heart as an input signal. By...
5435303 MRA image produced by temporal flow data sharing  
Flow encoded NMR pulse sequences are employed to acquire data sets from which a set of angiographic images can be reconstructed depicting blood flow at successive phases during the cardiac cycle....
5411031 Implantable cardiac patient monitor  
A cardiac monitor which is fully implantable beneath the skin of a patient monitors heart rate variability of a human heart. The heart rate monitor includes at least one electrode which establishes...
5381803 QRS detector for defibrillator/monitor  
A high-accuracy QRS detector detects "activity" on the ECG waveform. Activity results from a steep slope of one sense followed shortly thereafter by a steep slope of the opposite sense. Low-pass...
5372139 Method for suppressing a maternal electrocardiogram signal from a fetal electrocardiogram signal obtained with invasive and non-invasive techniques using an almost pure maternal electrocardiogram signal as a trigger  
A method (10) for suppressing the maternal electrocardiograph (MECG) signal from a composite abdominal ECG including an MECG signal, an fetal ECG (FECG) signal and noise to obtain a substantially...
5365934 Apparatus and method for measuring heart rate  
An exercise apparatus for measuring heart rate is provided which comprises a sensor for generating a signal which includes the biopotential signal produced by a heart. This signal is filtered,...
5355891 ECG analyzer  
Apparatus for analyzing ECG signals from a patient in the form of a data stream comprises a data stream monitor to locate for each heart beat a trigger point (26,37,25) having a constant temporal...
5348011 Shared excitation phase encode grouping for improved throughput cardiac gated MRI cine imaging  
A patient's cardiac cycle is monitored (34) for a characteristic point (54) of the cardiac cycle. Following or in response to the characteristic point, a series of field echo sequences (FIG. 3 )...
5348021 Apparatus and method for reliably detecting a depolarization activation wave of the heart and atrial defibrillator utilizing same  
An atrial defibrillator reliably detects a depolarization activation wave of the heart and delivers cardioverting electrical energy to the atria of the heart in synchronism with a detected...
5330507 Implantable electrical vagal stimulation for prevention or interruption of life threatening arrhythmias  
A method and apparatus for stimulating the right or left vagus nerve with continuous and/or phasic electrical pulses, the latter in a specific relationship with the R-wave of the patient's...
5315248 Method and apparatus for nuclear magnetic resonance for measuring speed of flowing target object  
A nuclear magnetic resonance imaging for measuring a speed of a flowing target object, capable of determining the speed of the flowing target object accurately, even for the high speed flowing...
5299119 Autonomic neuropathy detection and method of analysis  
A non-invasive, programmable cardio-respiratory monitoring system for performing automated autonomic nervous system function tests by monitoring and analyzing EKG signals in relation to specific...
5280791 Monitor system for determining the sleep stages of a person  
A simple system for determining a non-invasive sleep state of a person is described. The system comprises: (a) means for measuring the person's cardiac R-R waves interval; (b) means for calculating...
5277192 Imaging of turbulence with magnetic resonance  
Turbulent fluid flow within a subject is imaged using a magnetic resonance imaging method which is sensitive to non-coherent changes in the magnetic resonance signal intensity and phase....
5277182 Coronory artery imaging method and apparatus  
A method for imaging the coronary artery of a living body using nuclear magnetic resonance, wherein a patient is located in a static magneic field and the heart cycle of the patient is detected...
5273038 Computer simulation of live organ  
A computer system receives two dimensional slice data of a heart or other organ to be simulated in three dimensions. It also receives chemical composition data of the heart or other organ, and...
5263486 Apparatus and method for electrocardiogram data compression  
An improved electrocardiac monitoring device is disclosed in which the sampling period utilized to sample the ECG signal is varied dynamically. Specifically, during rapidly varying portions of the...
5259387 ECG muscle artifact filter system  
A filter system for removing small amplitude, high frequency signals such as muscle artifact signals from an ECG signal is provided. The filter system includes a low pass filter with variable...
5255186 Signal averaging of cardiac electrical signals using temporal data compression and scanning correlation  
A method and apparatus for aligning periodic cardiac signal waveforms for the purpose of signal averaging over a number of cardiac cycles. The aligning method and apparatus sense cardiac electrical...
5251628 Variable ECG delay in fast pulse sequence scans  
An NMR system performs a pulmonary vascular scan comprised of a series of slice acquisition. Each slice acquisition employs a series of fast pulse sequences (GRASS) which are completed in one...
5243993 Apparatus and method for measuring heart rate  
An apparatus for measuring heart rate is provided which comprises a sensor for generating a signal which includes the biopotential signal produced by a heart. This signal is filtered, amplified and...
5188117 Notch filter noise rejection system in a cardiac control device  
A physiological event signal sensing system in a cardiac control or monitoring device for detecting spontaneous cardiac electrical events which may be obscured by continuous or burst EMI line...
5093619 Method for the simultaneous measurement of NMR signals, in particular for determining flow rates in nuclear spin tomography by means of the multiple slice Fourier flow (muff) method  
In a method for the simultaneous measurement of spin resonance signals, in particular NMR signals, from layers located at different depths in a test volume, simultaneous excitation of the different...
5065766 Device for detecting R-waves in electrocardiogram  
A device for detecting an R-wave in an electrocardiogram, comprising a filter for passing a frequency band including the R-wave and a peak hold circuit for forming R-wave pulse signals from signals...
5058597 Long-term electrocardiograph for screening  
An electrocardiograph has an R wave detector for detecting an R wave out of an electrocardiogram (ECG) signal being collected from a subject. When the R wave detector detects an R wave, a heart...
5048535 Method and apparatus for detecting QRS complex of ECG  
A method for detecting a QRS complex of an ECG is provided. The method includes the steps of inputting an ECG signal, setting a first threshold value based on a peak value of a QRS complex of the...
5014284 Discrete slope delta modulation with recovery means  
A method and apparatus for processing electrical signals by modifying delta modulation to discrete slope delta modulation includes converting its electrical signals into compressed digital...
5010887 Noise discrimination in implantable pacemakers  
A noise discrimination circuit determines if sensed electrocardiographic (ECG) pulsed signals sensed within a pulse generator are valid ECG signals, i.e., valid P-waves or R-waves, or noise. The...
5000182 Cardiac synchronization magnetic resonance imaging  
A cardiac monitor (62, 64) monitors the cardiac cycles of a patient in an examination region (10). Each cardiac cycle includes an R-wave (40) at the beginning of the end-diastole. A conditioning...
Matches 51 - 100 out of 150 < 1 2 3 >