(DQA) This procedure is used by system operators to verify an x-ray system, gamma camera, or CT scanner operation based on relevant image quality parameters like e.g., geometric distortion, x-ray yield, signal to noise ratio. The quality assurance should carry out according to instructions of the manufacturer.

See also Acceptance Checking, Calibration and Calibration Factor.

The darkroom fog is an additional optical density on a film due to light leaks or safe lights in a darkroom. Darkroom fog degrades the film contrast and must be eliminated to ensure image quality.

Data acquisition is the generation of data that can be manipulated with a computer.

The nuclide produced by radioactive decay or nuclear reaction (e.g. in a generator) of the parent nuclide. The daughter nuclide becomes, if not stable, the unstable parent in the next decay.

See also Decay, Decay Chain and Generator.

See Radioactive Decay.