Exposure Factors/Technique Factors Flashcards
Controls the energy (penetrating power) of the x-ray beam
Kilovoltage (Kvp)
Controls the quantity or number of x-rays produced
Milliamperage (mA)
Controls the duration of the exposure, usually expressed in milliseconds
Exposure time (ms)
Quantity of x-rays produced in the time that is set
Milliampere Seconds (mAs)
Computer picks the mAs with a preset kVp
Automatic Exposure Control (AEC)
Distance of the tube from the image receptor, affecting magnification
Source Image Receptor Distance (SID)
A misrepresentation of object size or shape as projected onto radiographic recording media
Distortion
Distance between the object to the detector
Object Image Receptor Distance (OID)
The greater the SID means what about the magnification
Lesser
Series of “boxes” that give form to the image
Matrix
Intensity of light that represents the individual pixels in the image on the monitor
Brightness
A numeric representation of the x-ray intensities that are transmitted through the patient
Digital Images
Misrepresentation of object size or shape as projected onto radiographic recording media
Distortion
Highly complex mathematical formulas involved in digital processing
Algorithms
Numerical value that represents the exposure the image receptor receives in digital imaging
Exposure Indicator Number
Random disturbance that obscures or reduces clarity on a digital image
Noise
The recorded sharpness or detail of structural edges in the image
Spatial resolution
The difference in brightness between light and dark areas of an image (shades of gray)
Contrast resolution
A decrease in SID will reduce magnification (T/F) Why?
False because Increase the SID will reduce magnification
Shape distortion is caused when the part angled or is not running parallel to the surface of the IR
What are the two distortion? (T/F)
True - Elongation and Foreshortening
As the distance between the object and the image receptor is increased, magnification is reduced. WHy? (T/F)
False because the magnification is increased
Elongation occurs when the tube is angled(T/F)
True
A grid is used when the part is measured greater than 10cm (T/F)
True
ALARA is acronym for? 3 ways to help with radiation
As Low As Reasonably Achievable. Time Distance Shielding