Calculate the CT numbers (HU) for the following tissues at given X-ray beam energies. Indicate whether the beam energy is suitable or not suitable for imaging of that specific tissue type. In the table below, the attenuation coefficients µ (m-1) are listed for each tissue for each of the beam energies. Beam Energy/Tissue 50keV 60keV 150keV Fat  20.17 18.75 14.25 Muscl  23.75 21.50 15.67 Compact Bones 81.45 60.44 28.42 Water 22.69 20.60 15.05

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