X-ray Computed Tomography (CT)
During a CT measurement, an X-ray source is rotated around the subject while the X-ray sensor is placed opposite from the source to collect information from the body. When X-rays penetrate through tissue there is a certain likelihood that it will get absorbed based on electron density. CT produces a topographic data volume similar to PET which can be used to show different structures of the body differentiated based on their ability to block the projected X-ray. CT imaging is mostly used in bone and lung investigations, but several other diagnostic methods are used as well, where rapid imaging coupled with high resolution is required, like cardiac CT.