Cartoon of a tomography experimental setup
This animation is a cartoon of a generic x-ray tomography setup. A sample is irradiated with a parallel beam of x-rays and the transmission image is recorded on a scintillator screen (here shown in green) as a function of sample rotation angle. The image on the scintillator is imaged on to a camera sensor. Here, the image on the sensor is smaller than the transmission image on the scintillator, which is unusual; this configuration was chosen simply because it makes the setup easier to understand.
A set of tomograms can be generated by a half rotation (180o). The sinogram on the right actually records a full rotation at the height given by the flashing yellow line on the camera sensor, from which two tomograms can be generated via back projection.