Methods for color Doppler imaging in an ultrasound imaging system are disclosed herein. Ultrasound radio frequency RF data is demodulated using a nested processing loop including an inner loop and an outer loop. A plurality of Wall filter coefficients are fetched from ultrasound imaging system memory in a single memory access cycle. The plurality Wall filter coefficients are applied to a plurality of complex ultrasound data values in a single execution cycle. The Wall filtered ultrasound data are provided to a flow estimator.
