Radiology Theory Flashcards
what is key to ensuring a radiographic study is complete
orthogonal projections
where are electrons in a radiograph coming from and where are they going
cathode; anode
how is an x-ray made
electrons accelerated in a vaccum from cathode to anode -> anode produces x-rays -> x-rays directed to patient -> x-rays hit detector
what are the 3 fates of an x-ray when it is directed at a patient
absorbed, scattered, or transmitted
transmission appears _________ whereas absorption appears ________
black; white
what is kVP
difference in charge between the anode and cathode
what reflects the energy of x-rays
kVP
what reflects the number of x-rays
mA
what happens to exposure when you increase mA or kVP
increases
an underexposed x-ray appears ____________ whereas an overexposed x-ray appears __________
white; black
why is an overexposed x-ray darker as opposed to lighter
more mA = more x-rays and more kVP = more energy -> results in more x-rays being transmitted as opposed to absorbed -> darker image
what images do you want when analyzing an x-ray
DICOM images
describe magnification in radiology
anything further from the detector will become magnified
what are the Roentgen signs
Shape
Margins
Size
Opacity
Number
Location
what are the opacities from least to most radiopaque
air, fat, soft tissue/water, mineral/bone, metal/contrast
