diagnostic system 110 sensitivity depending upon the data analysis method the use of n independent bands of ir wavelengths generally leads to a u221a n increase in sensitivity with the two bands used throughout this description this increase in sensitivity leads from a single band ir diagnostic system having a sensitivity of 30 m u00b0 c to a dual band ir diagnostic system 110 having a sensitivity of 21 m u00b0 c alternatively if 30 m u00b0 c is the desired diagnostic system 110 sensitivity then the dual band ir imager 112 can incorporate two single band ir photodetector arrays each having a sensitivity of 42 m u00b0 c thereby improving manufacturability the increased sensitivity of the dual band ir imager 112 over a single band ir imager decreases the occurrence of false positive and false negatives due to tissue and skin variations different portions of the skin may radiate different levels of ir flux even though both the skin and the underlying tissue are healthy as an example a birthmark will likely radiate heat differently than normal skin similarly a tattoo may create a false positive or false negative as it too will radiate heat differently than normal skin for a very sensitive single band ir imager a large freckle may lead to a false positive or false negative however by using two series of ir images each taken in different bands of ir wavelengths false positives and false negatives due to variations in skin color will be minimized variations in the underlying tissue can also affect detection of diseased tissue while a breast may have relatively uniform tissue an arm will include areas of significant.