Sequence optimization for high frame rate imaging with a convex array

In this paper, five different sequences for image compounding at a high frame rate with very few sub-images are investigated for abdominal exploration with a convex probe. Simulation and experiments using a ULA-OP 256 scanner were made to compare the resolution and contrast-to-noise ratio (CNR) of the different sequences. The best configuration is based on a sliding apodization window, gives a resolution of 1°(i.e. 2.1 mm) and CNR of 12.4 dB at 6 cm depth in a Gammex Sono403™ phantom. A frame rate of 1.2 kHz can be achieved at 20 cm depth. This high-frame rate sequence has been chosen to allow the study of fast transient phenomena such as the pulse wave propagation and peak systolic velocity in deep vessels like the abdominal aorta.