Motion compensated complementary coding for medical ultrasound

Mirrored motion compensation for complementary-coded ultrasonic imaging

“…As reported previously in [5], the proposed Golay-based scheme demonstrates promising performance under simulated conditions with an appreciable improvement in axial resolution and peak side-lobe level relative to the FM-chirp and without the loss in frame-rate often associated with complementarycoded imaging. This is accompanied by an approximate 5dB increase in coding gain over a comparable chirp at an imaging depth of 1cm, which increases to 18dB at a depth of 10cm under simulated frequency-dependent attenuation of 0.7 dB/MHz/cm.…”

“…Published opinions [2], [3] vary as to the relative suitability of frequency-modulated (FM) signals and binary phase-coded signals for medical ultrasonics. The results of our own investigations [5] suggest that bipolar impulsive filters for binary-phase-coded signals exhibit greater resilience to the distorting effects of transducer and medium than filters matched to linear FM signals of similar duration and bandwidth. This translates to improved axial resolution and reduced fall-off in SNR with increased depth of imaging but these benefits can be offset by the relative complexity of side-lobe suppression for binary-code filters.…”

“…A previous publication [5] described a novel approach to complementary-coded ultrasonic imaging, whereby the constituent codes of a complementary set are transmitted individually without sacrificing frame rate. Here, it is extended to deal with more complex motion profiles and mirrored compensation stages are introduced to reduce alignment issues.…”