SENSORS FOR MEDICAL THERMOGRAPHY AND INFRARED RADIATION MEASUREMENTS · 439 A B Figure 9.18. (a) A knee thermogram (hot area showing inflammatory arthritis) recorded with an AGEMA 782 (1984), mechanically scanned, single-element, InSb detector cooled by liquid nitrogen (3 µm to 5 µm). (b) Inflammatory arthritis affecting one knee, recorded by a FLIR SC500 (2002), 320 pixel × 240 pixel FPA uncooled microbolometer (7 µm to 13 µm). It has a spatial resolution (IFOV) of 1.3 mrad and a thermal sensitivity at 50 Hz to 60 Hz of 0.08°C at 30°C.