A note on beam hardening in iodine-subtraction imaging and its implications for quantitative measurements

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Abstract
Considers the effect only of primary beam hardening due to iodine and bone in subtraction imaging with particular reference to the potential application in quantitative digital fluorography. In order to examine spectral effects comprehensively, it is important to use the same detector material as is used in an image intensifier, namely caesium iodide. If an image-intensifier TV system is used experimentally, it is difficult to eliminate the effects of the other listed contributions to the pixel value. Primary-beam hardening has therefore been estimated theoretically for a range of fluorographic conditions.