Radiology 1. Basic Physics Flashcards
what are radiographs?
images created by xrays which have been projected through an object & then interacted with a receptors
what are the different shades of grey on a radiograph?
correspond to different types of tissue & thicknesses of tissue involved
why radiographs useful?
- see mineralised tissues particularly well
- can show normal anatomy or pathology
- aids diagnosis and treatment planning
what are the intraoral and extraoral types of dental radiographs?
Intro oral: periapical, bitewing, occlusal
extra oral: panoramic, lateral cephalogram
whats a soft vs hard x ray?
soft x ray= lower energy, easily absorbed by tissues
hard x ray= higher energy, able to penetrate human tissues
what are properties of x-rays?
form of EMF radiation (no mass/charge)
undetectable to human senses
cause ionisation (displacement of electrons from atons/molecules)
what are properties of x-rays?
form of EMF radiation (no mass/charge)
undetectable to human senses
cause ionisation (displacement of electrons from atons/molecules)
what is an x-ray beam?
millions of x-ray photons directed in the same general direction. [More photons = higher intensity]
the photons travel in straight lines from the source however they diverge over a distance
why is inverse square law relevant to xrays?
intensity of x-ray beam is inversely proportional to square of distance between x-ray source and point of measurement
intensity = 1/(distance^2)
why is inverse square law relevant to xrays?
intensity of x-ray beam is inversely proportional to square of distance between x-ray source and point of measurement
intensity = 1/(distance^2)
