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MIT 211 Week 7

CR vs Flat Panel Detectors

QuestionAnswer
Factors of CR Introduced in 1983 stored images on phosphor plates, involved cassette and cassette reader, viewing station and/or printer
Direct and Indirect Capture vs Inversion Direct is no light layer to convert, Indirect process involves conversion of a light layer
Computed Radiography (Indirect)(Inversion and Capture) Changes energy to light using photostimulable plates ; Photo diode transfers photons to electrons
Digital Radiography (direct or indirect) Computer chips convert light into electrons or morphus selenium in IR converts directly into electrons (no light layer step)
What happens to photosimulable phospor plate (CR) in cassette reader? Laser runs overtop of PCP calming down excited electrons (transmitted photons) which gives off light that is read in a photomultiplier tube
What is used as an accelerated technique to return electrons to a calmed state? Infrared Light
What indirect conversion occurs in Digital radiography? X-rays are converted into light, CCD or thin film transistor converts light into electric signals (electrons)
Window level adjusts what? Brightness
Window width adjusts what? Contrast
PACS Picture archiving computed system
DICOM networked group, can be from different modalities, archives and stores them (serves as the file room)
Created by: kdabney22
Popular Radiology sets

 

 



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