Therefore, we performed a study of the registrations errors. The deleterious effect of registration errors is clearly evident in the figure below. The next images show the result of compounding more and more intersecting B-scans with typical registration errors. Registration is the procedure of realigning the images and should be done before compounding. We have developed a registration algorithm that involves the use of landmarks and computer vision techniques to align the B-scans with each other during the reconstruction.
Image quality is one of the most important issues in ultrasound imaging.
Ultrasound images tend to be noisy due to the presence of speckle. Speckle originates from the constructive-destructive interference of the ultrasound pulses, and is produced to some extent by all ultrasound machines. An important aspect of spatial compounding is its ability to reduce speckle noise to improve image quality. Look again at the figure above to notice how spatial compounding reduces speckle noise. Much of the surrounding white speckle is reduced and the organ grey level is more homogeneous.