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The study reports the development of a thermal imaging method suitable for the screening and differentiation of joint inflammation in the rheumatoid foot of patients in comparison with the control group of healthy participants. The study included 81 patients, with rheumatoid arthritis (RA), and 39 healthy volunteers without any signs or symptoms of inflammation. The feet joints were examined by ultrasonography, and the surface temperature of the dorsal side of the foot was measured using a thermovision camera. Significant differences in mean temperatures between the study group and the control group were found. At the same time, there were no statistically significant differences between the mean temperatures in the left and right foot in any of the designated regions in the study and control group. The comparison of average temperatures of joints with or without inflammation, according to ultrasonography, did not show significance except for two joints. Despite the lack of statistical differences in the recorded temperatures, changes in the form of spikes, hot spots, and gradation of the temperatures during screening were observed. Screening analysis of the temperature distribution of the foot can aid in the diagnosis of RA and in the evaluation of the development of the disease. Additional studies must be conducted to confirm the results of this study.

Thermal imaging for detecting temperature changes within the rheumatoid foot