['A', 'further', 'advantage', 'of', 'this', 'approach', 'is', 'that', 'US', '-', 'induced', 'cavitation', 'events', 'produce', 'distinct', 'acoustic', 'emissions', 'that', 'can', 'be', 'recorded', 'and', 'characterised', 'providing', 'non', '-', 'invasive', 'feedback', ',', 'a', 'feature', 'which', 'has', 'proven', 'useful', 'in', 'ablative', 'US', 'applications', '[', '17–19', ']', '.']