Fig. 4.

Optical designs of research-grade MIOCT systems for live surgical imaging. (A) MIOCT scanner coupled onto the camera port of a commercial microscope [70]. The OCT beam traversed through the microscope optical zoom module and the OCT lateral resolution and field of view (FOV) were coupled to the microscope zoom level. (B) MIOCT scanner integrated directly prior to the microscope objective [71]. This design required a telescope to magnify the OCT beam prior to the objective, but the OCT resolution and lateral FOV were independent of the microscope zoom level. (C) Alternative MIOCT design integrated directly prior to the objective and employing reflective elements to improve transmission and a tunable focus lens [117].