Fig. 3.

Illustration of 2D compression OCE on an inclusion phantom. (a) Sample arm of the imaging system. OL: objective lens, IW: imaging window, RA: ring actuator (the RA surrounds the IW and is shown cut-though in 2D), P: phantom (subjected to a bulk compressive strain of 15%), RP: rigid plate. (b) Axial displacement measured using phase-sensitive OCT from scans taken between different levels of microscale actuation. Least-squares regression is performed on (b) to obtain the strain elastogram of the phantom in (c). Images (b) and (c) correspond to the region denoted by the dotted black lines in (a). Scale bars represent 500 µm.