DR RAY CLARKE & MERVYN GOFF / SCIENCE PHOTO LIBRARY DR RAY CLARKE & MERVYN GOFF / SCIENCE PHOTO LIBRARY
Thermogram of the legs of someone suffering from rheumatoid arthritis affecting the knee joints. A thermogram is a colour-coded map of temperature distribution over the body surface. The colour coding shows variation in temperature, ranging in steps from blue-black (coolest) to white (warmest areas). Alterations in skin temperature are characteristic of certain diseases; inflammation in rheumatoid arthritis may give rise to temperature increases of up to 2 degrees C. Here, the left knee appears more severely affected, displaying a hotter, white area than the right knee.
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