SU‐F‐J‐75: Accuracy and Stability of Electron Density Measurements Across Patient Size Using Dual Energy CT

Purpose: Dual energy (DE) CT can be used to characterize tissue composition. One application of DE CT is to measure electron density (ED, rho) and atomic number (Z) for use in radiation therapy treatment planning. This work evaluated the accuracy and stability of ED estimation as patient size varied for both single‐energy (SE) and DE CT. Methods: An ED phantom (CIRS) and four torso‐shaped water tanks (lateral widths 15, 25, 35 and 45 cm)...