An Investigation of Calibration Phantoms for CT Scanners with Tube Voltage Modulation
Figure 6
Dual-material calibration phantoms and corresponding correction images of FORBILD head phantom. The first row shows dual-material calibration phantom with different sizes. (a) A 14 × 12 cm oval bone phantom with 13 × 11 cm water insert. (b) A 13 × 11 cm oval bone phantom with 11.5 × 9.6 cm water insert. (c) A 13 × 11 cm oval bone phantom with 12.4 × 10.4 cm water insert, in which a 1.2 × 1.0 cm oval bone is inserted in the center. (d), (e), and (f) are correction images of the FORBILD head phantom using calibration phantoms shown in (a), (b), and (c), respectively.
