Arrhythmia rejection is a method to reject irregular RR intervals (time duration between two consecutive R waves of the electrocardiogram) in cardiac gating during cardiovascular imaging and to improve the image quality, whereby the cardiac frequency is used as the basis of the normal heart rate. The RR interval window determines the percentage variation of the heart rate. Variations of the acquired data outside the window are rejected and not used in the image reconstruction. Also one interval after the arrhythmic beat will be rejected. Arrhythmia rejection may be inappropriate for patients with certain pathologies, because if the RR interval is constant long, short, long, - all intervals would be rejected.

A particular point in the cardiac cycle.

See also Arrhythmia Rejection.

Cardiology is a medicine sector that covers the clinical study, treatment and imaging of the heart actions and diseases.

See also Ischemia, Calcium Score, Cardiac Phase, Diastole, Adventitia, Defibrillator, ECG Trigger, Arrhythmia Rejection.