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