An ultrasound imaging system (100, 200) configured to provide feedback on a quality of volume flow measurements, the system comprising: a non-transitory computer readable medium encoded with instructions and configured to store power Doppler data for a plurality of Z-surfaces of a volume including a region of interest, ROI,; and at least one processor in communication with the non-transitory computer readable medium configured to execute the instructions, wherein when executed, the instructions cause the at least one processor to: generate a histogram for individual ones of the plurality of Z-surfaces based, at least in part, on the power Doppler data, wherein the histogram has a first curve based on the power Doppler data from within the ROI and a second curve based on the power Doppler data from outside the ROI; characterized in that the system further comprises a user interface; and the instructions further cause the at least one processor to: calculate a signal-to-noise ratio, SNR, (236, 404) by subtracting in the logarithmic scale a peak of the second curve from a peak of the first curve for at least one of the plurality of Z-surfaces; and generate a quality factor based, at least in part, on the SNR; generate display data for a quality indicator (170, 414) based, at least in part, on the quality factor, wherein the quality indicator is indicative of the quality of the volume flow measurements, wherein the user interface is configured to display the quality indicator to a user based on the display data. a non-transitory computer readable medium encoded with instructions and configured to store power Doppler data for a plurality of Z-surfaces of a volume including a region of interest, ROI,; and at least one processor in communication with the non-transitory computer readable medium configured to execute the instructions, wherein when executed, the instructions cause the at least one processor to: generate a histogram for individual ones of the plurality of Z-surfaces based, at least in part, on the power Doppler data, wherein the histogram has a first curve based on the power Doppler data from within the ROI and a second curve based on the power Doppler data from outside the ROI; characterized in that the system further comprises a user interface; and the instructions further cause the at least one processor to: calculate a signal-to-noise ratio, SNR, (236, 404) by subtracting in the logarithmic scale a peak of the second curve from a peak of the first curve for at least one of the plurality of Z-surfaces; and generate a quality factor based, at least in part, on the SNR; generate display data for a quality indicator (170, 414) based, at least in part, on the quality factor, wherein the quality indicator is indicative of the quality of the volume flow measurements, calculate a signal-to-noise ratio, SNR, (236, 404) by subtracting in the logarithmic scale a peak of the second curve from a peak of the first curve for at least one of the plurality of Z-surfaces; and generate a quality factor based, at least in part, on the SNR; generate display data for a quality indicator (170, 414) based, at least in part, on the quality factor, wherein the quality indicator is indicative of the quality of the volume flow measurements, wherein the user interface is configured to display the quality indicator to a user based on the display data.