An Investigation of Calibration Phantoms for CT Scanners with Tube Voltage Modulation
Figure 5
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 water phantom with 8 × 6 cm bone insert. (b) A 14 × 12 cm oval bone phantom with 8 × 6 cm water insert. (c) A two-cylinder phantom; the upper one is an 8 × 6 cm bone cylinder and the lower one is a 5 × 3 cm water elliptical cylinder. (d), (e), and (f) are correction images of FORBILD head phantom using calibration phantoms shown in (a), (b), and (c), respectively.
