A CT scanner shares very similar components to an X-ray machine. The key difference is that instead of taking single images from the same position, a CT scanner takes many images from different angles.
When these images are complied together using 3D imaging software, a true 3D image of the x-rayed object is made. Such 3D images allow doctors to peer inside the human body in an non-intrusive way.
Soon after making his DIY X-ray backscatter imager, Ben Kransnow realised with few extra parts he could make a CT scanner. By adding a stepper motor to rotate a target object (Frozen Chicken) and 3D Slicer software, Ben took 45 images of a Chicken to create a 3D model of the Chicken.
This is a slightly different approach to a traditional CT scanner, since the scanner usually rotates around the patient. In this case the CT scanner remains static and the Chicken is rotated.