<unk>  is an imaging technique using X-rays, gamma rays, or similar ionizing radiation and non-ionizing radiation to view the internal form of an object. Applications of<unk>  include medical<unk>  ("diagnostic" and "therapeutic") and industrial<unk> . Similar techniques are used in airport security (where "body scanners" generally use backscatter X-ray). To create an image in conventional<unk> , a beam of X-rays is produced by an X-ray generator and is projected toward the object. A certain amount of the X-rays or other radiation is absorbed by the object, dependent on the object's density and structural composition. The X-rays that pass through the object are captured behind the object by a detector (either photographic film or a digital detector). The generation of flat two dimensional images by this technique is called projectional<unk> . In computed tomography (CT scanning) an X-ray source and its associated detectors rotate around the subject which itself moves through the conical X-ray beam produced. Any given point within the subject is crossed from many directions by many different beams at different times. Information regarding attenuation of these beams is collated and subjected to computation to generate two dimensional images in three planes (axial, coronal, and sagittal) which can be further processed to produce a three dimensional image.
Radiography
X-ray
Tomosynthesis
Magnetic field imaging
Ultrasound
Radiochemistry
Autoradiograph
Radiomics