An Investigation of Calibration Phantoms for CT Scanners with Tube Voltage Modulation

Figure 3

Water calibration phantoms and corresponding corrected images of FORBILD head phantom. (a) Elliptical cylinder phantom with semiaxes 48 cm and 40 cm. (b) Elliptical cylinder phantom with semiaxes 28 cm and 12 cm. (c) Corrected image using calibration phantom shown in (a). (d) Corrected image using calibration phantom shown in (b). (e) and (f) are zoomed-in images of the area enclosed by the red squares in (c) and (d). Display window is [0,600] HU.

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