1. A method, comprising: ablating a region of interest (ROI) in a material using an ablation catheter; acquiring an Optical Coherence Tomography (OCT) signal from the ablated ROI in the material, wherein the OCT is acquired by an OCT device within the ablation catheter; and during the ablating, controlling an apparatus coupled to the OCT device to determine a development stage of a lesion formed in the ablated ROI by analyzing an optical property of the ROI as recorded in the OCT signal.