Introduction to radiology and radiography Flashcards
What is the definition of radiograph
an image produced by the transmission of x rays through a object
What is radiography
the techniques involved in producing an radiographic image
what is radiology
The interpretation of medical imaging
what is radiation protection
the protection of patients and staff from the harmful effects of ionising radiation
how does blackening of a x-ray image occur
when x rays pass through the body to reach a image detector
different tissues absorb x ray photons differently which leads to a 2D image of a 3D object
what does superimposition cause
overlapping of shadows of different parts of an object
limitation of information on location and shape of object
no depth of info provided
Describe the properties of x rays and how they travel
X rays are high energy electromagnetic radiation that travel as photons.
They are invisible and can be absorbed or scattered
It is a form of ionizing radiation that can damage tissue therefore must be justified when taken
describe radio opaque areas
white, represent dense structures which have attenuated the x-ray beam
Describe radio luscnet areas
black, areas where ebam has passed through the object
what does the grey shadow in x rays represent
where beam has been stopped to a varying degree
what is the density of a radiograph affected by
Material type
Intensity of the x ray beam
Shape of the object
Sensitivity
Thickness of the object
Position of the object relative to the x ray beam and receptor
Name some types of x rays used in dentistry
Bitewings- good for crowns’
periapical- see through to apex
lateral cephalograms - othrodontist
dental pantomograms - full mandible and full maxilla
what is a zygoma
cheek bone
