Imaging Overview Flashcards
what is a radiograph?
the image produced
what is required to produce a radiograph?
x-rays, object, recording device
what are x-rays?
high-energy form of electromagnetic radiation
what is differential Attenuation?
the reduction of x-rays as they pass through material, creating a grayscale gradient
does more Attenuation produce the black or white portion of a radiograph?
white
what are the 4 Attenuation factors?
atomic #
density
thickness (of object)
kVp
does higher energy inc/dec attenuation
inc in E dec in attenuation
what is the contrast?
the difference between the x-rays that pass through the tissue over the # through the bone
how does the kVp relate to the potential difference?
high kVp is due to an increase in the potential difference
what does IR stand for
image receptor
what does the IR do?
absorbs radiation, and (electronically) produces the image
what is isotropic emission
the release of x-rays equally in every direction
how to reduce the effects of beam geometry distortion?
- smaller source
- collimation
- less OID
what is OID?
object to image receptor distance
what is collimation?
the limitation of the primary x-ray beam to the areas of interest
