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Image Production 1

Final Review

TermDefinition
Fluorescence Ability of phosphors to emit visible light when exposed to x-rays
Wavelength Distance between two successive crests or troughs of a sine wave
Frequency Number of sine waves passing a point per unit of time
Crooke's tube Low vacuum tube Roentgen used
Beam restriction Physical means of decreasing the size of the projected radiation field
Dual focus tubes X-ray tubes containing a small and large filament
Off-focus radiation Occurs when projectile electrons are reflected and x-rays are produced outside the focal spot
Thermionic emission The boiling off of electrons from the filament
Voltage ripple The amount of consistency in voltage waveforms during x-ray production
Line focus principle Relationship between the actual and effective focal spots
Anode heel effect Due to the angle of the target, x-ray intensity is diminished toward the anode side
Half value layer (HVL) Amount of filtration that reduces the intensity of x-rays to 1/2 the original value
Quantum noise Visible brightness fluctuations resulting from too few photons reaching the IR
Ionization The ability to remove electrons
Transmission Incoming x-ray passes through without interaction
Manifest image Visible image after processing
Latent image Invisible image within IR before processing
Magnification Increase in size of an object on image compared to actual size
Exit radiation X-ray beam leaving the patient made up of both transmitted and scattered radiation
Absorption The energy of an x-ray is deposited in tissue
Actual focal spot size Size of target area exposed to electrons in tube current
Effective focal spot size Measured directly under the anode target
Created by: m33jan
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