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(a) The water phantom aligned exactly at the isocenter without table attenuation. (b) In this perfectly symmetric setting, both full and partial scan reconstruction images have the same range of the CT number variations. (c) The water phantom located 10 cm off the isocenter. (d) Moving the phantom off the isocenter creates enough anisotropy to cause partial scan artifacts. The partial scan has a 7.6 times larger range of CT number variations compared to the full scan.
