1. A method of generating high frame rate composite ultrasound frames, comprising: acquiring a series of ultrasound frames for each of N sectors, wherein N is two or more, wherein each of said N sectors corresponds to a different area and wherein each of said series of ultrasound frames is acquired over a different one of one or more cardiac cycles; substantially simultaneously acquiring an ECG signal for each cardiac cycle, wherein each of said series of ultrasound frames for each sector is triggered or gated using said ECG signal; synchronizing data for each of said N sectors in time using said ECG signals; combining said data from said N sectors to generate a series of high frame rate composite ultrasound frames; and displaying at least one of said series of high frame rate composite ultrasound frames to a user.