ABSTRACT
A common in the introduction of clinical manuscripts on optical coherence tomography (OCT) imaging is: ‘OCT is an imaging modality analogous to ultrasound, with the difference that light is used instead of sound1-8’, or a similar phrase. What is the meaning of that adage? In this chapter, we make an attempt to qualify the analogy between light and sound as medical imaging modalities, outlining the physics of the imaging processes and summarizing the practical aspects of the likenesses and distinctions between OCT and ultrasonic imaging.
