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Radiation Protection Dosimetry 82:115-124 (1999)
© 1999 Oxford University Press

Evaluation of the Effect of Chest Wall Thickness, Tissue Composition, and Photon Energy on the Quantity Muscle-Equivalent Chest-Wall-Thickness by Monte Carlo Simulation

G.H. Kramer and L.C. Burns

Monte Carlo simulations have been used to derive the relationship between the counting efficiency and both the chest wall thickness and adipose mass fraction as a function of photon energy. Adipose mass fraction can be eliminated by the use of the derived quantity muscle-equivalent chest wall thickness and thus simplify the relationship. As a result, the counting efficiency at any adipose mass fraction can be predicted from a single exponential plot of counting efficiency against muscle-equivalent chest wall thickness; therefore, it is unnecessary to have a family of curves for different adipose mass fraction values. Uncertainties due to the measurement of the subject's adipose mass fraction and the difference between the subject's chest (ribs, cartilage) compared to the phantom cannot be eliminated by the use of muscle-equivalent chest wall thickness. Adipose mass fraction measurements are only important for 17 keV photons and can be neglected at photon energies greater than 40 keV.


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