ADC

(analog-to-digital converter) converts image information into numerical data

AEC

automatic exposure control (ionization chamber located between the patient and the image receptor)

Collimator

box-like structure attached to the x-ray tube containing lead shutters that limit the x-ray beam to a specific area of the body.

Automatic collimator

also known as positive beam limitation(PBL); the ability of the radiographic equipment to collimate automatically the x-ray beam to the same size as the image receptor resting in the Bucky tray.

Contrast resolution

the smallest change in signal that can be detected by the image receptor

Spacial resolution

the sharpness of the structural edges in the radiographic image; the smallest detail that can be detected

Exposure indicator

describes the status of the exposure and diagnostic value of the digital imag

Image receptor

any device or medium that captures the remnant beam

Image plate

plate that is coated with photostimulable phosphors that absorb the photon energies exiting the patient; located inside a computed radiography (CR) cassette

Voluntary motion is caused by the following:

• Nervousness
• Discomfort
• Excitability
• Mental illness
• Fear
• Age
• Breathing

Involuntary motion is caused by the following:

• Heart pulsation
• Chill
• Peristalsis
• Tremor
• Spasm
• Pain