Welcome to Prof. Dev Chakraborty's FROC methodology web site
FROC is an abbreviation for Free-response Receiver Operating Characteristic, which is but one of several ways of visualizing search data. The acronymn is misleading and it is more accurate to think of it as a search paradigm. Most imaging examinations involve the element of search.
FROC analysis is used to objectively evaluate imaging systems or radiologists in search tasks. It is intended to answer questions like which is the better imaging system for detecting breast cancer? How good is the radiologist at detecting cancer? In the free-response paradigm the radiologist marks and rates suspicious locations on images. The rating is the confidence level that the marked region is malignant. The free-response paradigm closely parallels tasks such as finding lesions in mammograms or nodules in lung cancer screening. FROC analysis enables more precise evaluation of imaging systems (greater statistical power) than when location is ignored. Recent progress in this field has resulted from a connection made between this paradigm and the Kundel-Nodine model of human perception, which led to the Chakraborty search model for the free-response paradigm.
Images courtesy of Dr. Claudia Mello-Thoms and Prof. Harold Kundel