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Figure 6a: Effect of patient size on adequacy of CT-based attenuation correction. (a) Graph shows µ511 versus patient size for 80 kVp, 10 mA, 0.5 second per rotation, and 1.5:1 pitch. An appropriate value for µ511 (>0.0900 cm–1) was obtained for all pediatric phantoms but not for the adult phantoms. (b) Graph shows µ511 versus tube voltage, tube current, and rotation speed for the adult phantoms. All CT data were acquired with 1.5:1 pitch. Note that, for 10 mA, 120 kVp is necessary and that, for 80 kVp, 40 mA would be necessary for adequate CT-based attenuation correction.
