Siemens Gammasonics, Inc.

Mark W Groch

James R Domnanovich

George K Lewis

James T Rhodes

From a heart sound signal input the occurrence of a first occurring heart sound is detected. Thereupon a predetermined heart sound enable window time is established, which for a first detection cycle is set to approximately the diastolic interval for the maximum heart rate to be detected. If a second heart sound occurs within this heart sound enable window time, this second heart sound is detected as a systole heart sound. The first heart sound may be detected as a diastole heart sound. If a second heart sound does not occur within the heart sound enable window time the procedure is repeated with increasing heart sound enable time as long as a second heart sound occurs within an increased heart sound enable window time. For diagnostics synchronization signals developed exclusively from the heart sound signals are used to validate data from diagnostic equipment such as a gamma camera.

Apparatus for beat buffering techniques varified by arrhythmias

From a heart sound signal input the occurrence of a first occurring heart sound is detected. Thereupon a predetermined heart sound enable window time is established, which for a first detection cycle is set to approximately the diastolic interval for the maximum heart rate to be detected. If a second heart sound occurs within this heart sound enable window time, this second heart sound is detected as a systole heart sound. The first heart sound may be detected as a diastole heart sound. If a second heart sound does not occur within the heart sound enable window time the procedure is repeated with increasing heart sound enable time as long as a second heart sound occurs within an increased heart sound enable window time. Cardiac cycle data provided by diagnostic equipment is gated from discriminated heart sound signals and also ECG signals to provide more meaningful diagnostic analysis.

Heart sound detector and cardiac cycle data are combined for diagnostic

From a heart sound signal input the occurrence of a first occurring heart sound is detected. Thereupon a predetermined heart sound enable window time is established, which for a first detection cycle is set to approximately the diastolic interval for the maximum heart rate to be detected. If a second heart sound occurs within this heart sound enable window time, this second heart sound is detected as a systole heart sound. The first heart sound may be detected as a diastole heart sound. If a second heart sound does not occur within the heart sound enable window time the procedure is repeated with increasing heart sound enable time as long as a second heart sound occurs within an increased heart sound enable window time. For monitoring remotely or by a using recording, an ECG signal is modulated and combined with the associated heart sound signal for use as a single combined signal.

Apparatus for monitoring cardiac activity via ECG and heart sound signals

Heart sound detector and synchronization for diagnostics

A motion correction method and related analog motion correction circuitry are disclosed, which correct for image blurring due to patient movement in scintigram heart studies using an Anger camera. X, Y positional coordinate signals developed for incident quanta of radiation E1 emitted by an isotope of energy 1 distributed in the heart are displayed on a CRT screen after correction in accordance with the displacement from an initial position X.sub.o ', Y.sub.o ' of a centroid calculated from X', Y' positional coordinate signals developed for incident quanta of radiation E2 emitted by isotope of energy 2 in the form of a point source strapped to the patient's chest for movement therewith.

Motion correction circuitry and method for a radiation imaging device

From a heart sound signal input the occurrence of a first occurring heart sound is detected. Thereupon a predetermined heart sound enable window time is established, which for a first detection cycle is set to approximately the diastolic interval for the maximum heart rate to be detected. If a second heart sound occurs within this heart sound enable window time, this second heart sound is detected as a systole heart sound. The first heart sound may be detected as a diastole heart sound. If a second heart sound does not occur within the heart sound enable window time the procedure is repeated with increasing heart sound enable time as long as a second heart sound occurs within an increased heart sound enable window time.

Method and apparatus for detecting heart sounds

A system and method for obtaining a nuclear kymogram of regional wall motion of an organ under study such as a human heart includes injecting a radioisotope into the blood stream which accumulates in the cardiac blood pool or myocardium. A scintillation camera having a reduced generally elongated area of data recordation is positioned overlying a selected portion of the heart and positional 'events' occurring along the major axis of the area of recordation are swept across a CRT in synchronism with the ECG signal. Successive real-time displays each in synchronism with the ECG signal are accumulated to provide a nuclear kymogram.

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Elk Grove, IL, United States of America

Mark W Groch