Color Doppler data is acquired only over a portion of the cardiac cycle, such as during diastole in order to increase the sensitivity of detection. Ultrasound system parameters such as clutter filter coefficience, temporal and spatial filter coefficients may be altered only for a portion of the cardiac...http://www.google.de/patents/US5709210?utm_source=gb-gplus-sharePatent US5709210 - Ultrasound system for imaging
