Radiology - Digital vs Film Flashcards
what types of intra-oral image receptor are used in digital radiography?
phosphor plates
solid state sensor
what types of intra-oral image receptors are used in film radiography?
direct action film
indirect action film
when is a size 0 image receptor used?
anterior periapicals
when is a size 2 image receptor used?
bitewings
posterior periapicals
when is a size 4 image receptor used?
occlusals
in digital radiography, what colour does the grid square go when few photons are reaching the receptor?
white - value 255
what type of image receptor (film or digital) used grid squares/pixels?
digital
what is the benefit of a digital radiograph having more grid squares/pixels?
better detail as it has higher resolution
resolution has a limit in terms of being beneficial cliniccally
what are the disadvantages using digital receptors?
each image requires storage space which is expensive
how many bits (binary digits) do digital radiographs typically use to create an image?
8 bits (binary digits)
= higher the number of bits the more accurate
what is the total number of shades of grey used in digital radiographs?
256 shades of grey
what is the format for digital images?
DICOM - digital imaging and communications in medicine
what software manages digital images?
PACS - picture archiving communications system
what is the limitation of PACS?
Hospital PACS is not linked to practices - have to ask for them separately
how do we view digital radiographs?
subdued lighting without glare
clean, bright monitor with adequate resolution and contrast
describe how digital phosphor plates work.
not connected to a computer
after use the plate is put in a scanner and read to create the final image.