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Radiology: Digital Imaging questions with verified answers
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Radiology: Digital Imaging questions with verified answers
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Radiology: Digital ImagingWhat does DICOM stand for? - correct answer ✔✔Digital Imaging and Communication in Medicine
Matrix size - correct answer ✔✔Row x column of a digital image - made up of pixels.
Pixel - correct answer ✔✔Picture element - in a digital radiograph each assigned a shade of gray based
on xray transmission pattern from that specific area
What is the size of most DICOM files? - correct answer ✔✔4-12 MB, MUCH larger than word docs or
images
Bit depth is what? - correct answer ✔✔The number of possible grey shades and is directly related to the
number of pixels in a file . Formed from binary code in the digital processor with binary numbers 1 & 2.
Usually range from 14-16, and because of the limitations of the humane eye there is little benefit beyond
this.
What are the two types of digital radiography? - correct answer ✔✔Computed radiography (CR) and
Direct digital radiography
What is the biggest difference in computed radiography and direct digital radiograph? - correct answer
✔✔For both systems the conventional x-ray tube, x-ray table and grid are used. In CR systems a cassette
containing a flexible image plate is used, where as with DR there is a rigid imaging plate.
Computed Radiograph involves what to process? - correct answer ✔✔Cassettes - similar to film screen,
but involves a imaging plate. The imaging plate is coated with photostimulable phosphor (PSP). The
image created by the xrays and patient is then temp stored as a latent image on PSP (in the form of
electrons). The imaging plate is then stimulated by a scanner that creates a visible image (from
electrons) that can be displayed on a screen. *This process is repeatable once the plate is returned back
to the cassette*
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