This command displays a dialog box showing the phantoms that are pre-programmed
into CTSim. After selecting one of these phantoms, the new window with that
phantom will be generated. The pre-programmed phantoms are:
Herman
The Herman head phantom[1]
Shepp-Logan
The head phantom of Shepp & Logan[2]
Unit pulse
A phantom that has a value of 1 for the
center of the phantom and 0 everywhere else.