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Fig. 3 | Arthritis Research & Therapy

Fig. 3

From: Refinement and validation of infrared thermal imaging (IRT): a non-invasive technique to measure disease activity in a mouse model of rheumatoid arthritis

Fig. 3

IR camera functionality and accuracy check. Temperature maps for the IR camera while looking at a boiling water, b melting ice, c tear duct, and d black body with a temperature of 36 °C. The ROIs were defined as square boxes to measure the minimum, maximum, and average temperature for boiling water, melting ice, and blackbody while for the tear duct measurement, the spot measure tool was focused on tear duct. e The plot of the IRT reading vs. standard temperature values for given black body temperatures showed linear relationship between IRT measurements and reference black body temperature within 35–40 °C temperature range. Each point represents the average of 3 separate readings and the linear regression line is shown in red

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