Background,Motivation and Objective With the advent of high-frequency arrays,achieving micro-resolution ultrasound imaging at real-time frame rates is nowadays readily feasible.However,in using this tool to image cardiovascular dynamics in small animals,the time resolution remains inadequate because data acquisition was typically done via scanline-based beam sweeping.This issue is further aggravated by the fact that the heart rate of rats(up to 400 beats/min) is typically 4-6 times higher than that of humans.To overcome this technical bottleneck,here we aim to establish a new high-frequency array platform with achievable frame rate well above 1000 fps as realized through plane wave compounding.