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Fig. 1. Cloacal body temperature predicted by thermographic measurements of scalp temperature. (A) Cloacal temperature vs raw thermographic values. The effect of absorption and emission in the 80° lens attachment are evident. (B) Cloacal temperature thermographic temperature corrected for lens effects. True radiometric scalp temperature averages about 1°C lower than cloacal temperature. (C) Measured cloacal temperature vs cloacal temperature predicted by a regression to the data in Fig. 1B. In all cases, data points are from a single image, and overall precision can be improved by calculating the mean of data from several images.