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Contrast recovery coefficient (CRC) for 0.5 cm diameter spheres as function of iteration number for spheres at radial position of (A) 7cm and (B) 13 cm. The sphere uptake was 6:1 relative to a background that was a 35 cm diameter by 70 cm long cylinder. Each CRC value is an average over 8 equivalent spheres, while the error bar is the ± standard deviation value calculated over the 8 sphere CRC values. Results are from an EGS4-based simulation.
