Determining the structure of lung tissue is difficult in ex-vivo samples. Optical coherence tomography (OCT)
can image alveoli but ignores optical effects that distort the images. For example, light refracts and changes
speed at the alveolar air-tissue surface. We employ ray-tracing to model OCT imaging with directional and
speed changes included, using spherical shapes in 2D. Results show apparent thickening of inter-aveolar walls
and distortion of shape and depth. Our approach suggests a correction algorithm by combining the model with
image analysis. Distortion correction will allow inference of tissue mechanical properties and deeper imaging.