Syntethic Aperture Sequential Beamforming (SASB) has been proven to achieve a better resolution and penetration depth than Dynamic Receive Focusing (DRF). SASB has also shown great potential for use in a handheld device. SASB with a low F# (<= 0.5) has shown even better resolution at the cost of high grating lobes, which cause loss of contrast in the final image. The hypothesis is that Spatial Match Filter (SMF) applied to the second stage can lower these grating lobes thereby obtaining both high contrast and better resolution.