Abstract: A method of imaging a portion of a body placed in a static magnetic field by means of magnetic resonance (MR) includes the measurement of ECG data of the body in the form of a vector cardiogram, and determination of an acquisition period from the ECG data, including directional information in the vector cardiogram, in order to synchronize measurement of MR signals to a cyclic movement of the body.

Abstract: An apparatus and method for sensing cardiac function in a patient, particularly adaptable to being worn by an ambulatory patient. Including sensor to receive ECG signals in at least plane of the patient chest area, and an analyzer to derive a signal representation of the electrical axis of the patient heart. Changes in the signal representation can be evaluated to include heart condition. The axis analyzer and other ECG information can be used to generate rate information used in conjunction with the heart axis signal representation. Incidence of phase zero-crossing of the heart axis signal representation and the magnitude peaks can be used to indicate and distinguish various heart conditions.

Abstract: A method and apparatus for signal averaging and analyzing high resolution P wave signals from an electrocardiogram. The method and apparatus for averaging the P wave portion of ECG signals includes sensing human ECG signals having at least a QRS portion and a P wave portion, detecting the QRS portion of the ECG signals, suppressing the QRS portion of the ECG signals, generating a P wave detection function from the wave portion of the ECG signals, cross correlating the P wave portions of the ECG signals and averaging the cross correlated P wave signals. The method and apparatus for analyzing high resolution P wave signals includes averaging at least a portion of the ECG signals, filtering the averaged signals, deriving the vector magnitude (VM) of the filtered averaged signals, determining the base noise level, and setting the P onset and P offset of the VM signals above the noise level.