The graph shows X-ray attenuation coefficients versus photon energy for bone,DCA and water. A phantom is imaged at 50 and 150 keV and the developed film viewed. Which statements hold?
Correct answer: (B) At 50 keV DCA appears brighter than bone; (C) At 150 keV bone appears brighter than DCA
Explanation
Greater attenuation exposes the film less, so the region appears brighter on the displayed conventional radiograph. At fifty keV the graph places DCA above bone, making DCA brighter. At one hundred fifty keV bone lies above DCA, reversing the comparison. Thus B,C.
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