Apparatuses, systems, and methods of monitoring lesion formation using one-dimensional echograms are disclosed. In certain aspects, lesion formation progress is monitored using the intensity of reflectors in successive echograms during ablation. In another aspect, lesion formation progress is monitored based upon actual or apparent movement of acoustic reflectors before and after ablation. In still another aspect, the presence or absence of resonant microbubbles known to populate forming lesions are used to provide feedback on lesion formation. A lesion analysis processor can be programmed to determine lesion formation progress using any of the foregoing approaches, either alone or in various combinations.
