Imaging Basics
What helps minimize radiation?
Time, Distance, Shielding
What is the source of electrons during x-ray production?
X-ray beam quality refers to the penetrability of what?
Photons
Size or shape distortion includes what?
magnification, elongation, and foreshortening
What are the minimal views taken?
Lateral, VD/DV
The distance between the radiation source and the image receptor is what?
SID - source image distance
What has a negative charge, keeping the negatively charged electrons focused.
Focusing cup
What is the result of scattered photons interacting with the image receptor?
Fog
What effects the speed of radiographic film?
Both the amount and size of the silver halide crystals
the pylorus
What controls the penetrating power of the x-ray beam?
kVp
What is the positive side side of the x-ray tube?
Anode
The misrepresentation of the size of an object is what?
magnification
What displays a greater number of gray shades but smaller differences among them?
Low contrast images
What structures are including in a thoracic image?
From the cranial thoracic inlet to the most caudodorsal lung field
What directly controls the density produced on the image?
mAs
What consists of very thin lead strips with radiolucent interspaces ?
grid
Why are grids used?
to absorb the scattered radiation exiting the patient
The overall blackness on the processed film image is what?
Density
In a VD view of the abdomen, you should see the relevant spinous processes aligned with what?
center of the vertebral bodies
The quality of a radiographic image depends on what?
brightness, accuracy, contrast
Intensifying screens do what?
convert the exit radiation intensities into visible light, and the light exposes the crystals in the emulsion.
This is the production of an x-ray photon by the attraction between an incoming electron and the nucleus of the tungsten atom
Bremsstrahlung interaction
What is the relationship between distance and x-ray beam intensity called?
inverse square law
What are the major directional axes?
mediolateral (ML), dorsopalmar/dorsoplantar (DP), or craniocaudal (CrCd).