Electronic Imaging Test
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| measurement of the luminance of a monitor calibrated in units of candela per square meter on monitor or soft copy | brightness
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| density differences | contrast
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| picture element | pixel
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| controls number of shades of gray that can be visualized -formula=2 to the nth(n=number of bits) | bit depth
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| what can bit depth be limited by | dynamic range & quantization
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| range of exposures that may be captured by a detector | dynamic range
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| bits per pixel | quantization
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| step by step procedure for software function | algorithm
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| what are the steps of digitization | *scan-divides analog image into an array of pixels
*sampling-measures brightness level of each pixel using a photo multiplier tube
*quantization-brightness levels are assigned a number gray scale value
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| PMT | (photo multiplier tube)-converts low level of light to higher level or A-D)
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| rows and columns of pixels | matrix
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| the sharpness of structural edges recorded in the image | spatial resolution
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| what factors is spatial resolution dependent upon | *pixel/matrix size
*pixel pitch
*bit depth
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| space from center of a pixel to center of the adjacent pixel | pixel pitch
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| number of pixels/mm | pixel density
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| range of exposures which produces optimal image with appropriate dose *since range is wider with digital radiography this can lead to dose creep | exposure latitude
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| PACS | picture archiving communication system
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| what methods of storage are used with digital images | *hard drive
*dvd/cd
*hologram
*down-time flash drive
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| RAID | redundant array of inexpensive discs
-(jukebox)hard drive used to archive digital images
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| hard drive used to archive digital images | optical laser disc drive
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| what two type of computer monitors are used | *LCD(liquid crystal display)
*CRT(cathode ray tube)
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| what is the PACS system used at Halifax | DR-dominator radiology
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| *no loss of information *3:1 compression ratio | lossless compression
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| *some loss of information, but likely not noticeable *5:1 ratio | nearly lossless compression
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| *suitable to send images over low bandwidth network *lossy wavelength compression alters minute details to reduce compressed image size *10:1 - 100:1 ratio | lossy high quality compression
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| *most compressed and fastest working *gray scale reduced to about 256 shades of gray *similar to jpeg images | lossy medium quality compression
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| hard copy images from digital data | laser film
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| used to burn digial images on to disc for patients | cd/dvd burner
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| RIS | radiology information system(PACS)
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| HIS | hospital information system(meditech)
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| LUT | (look up table)
*term used for image that is initially displayed after aquisition
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| DICOM | (digital imaging and communication in midicine)
*for imaging systems to transfer images
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| *must be met for HIS to transmit information and populate patient data in RIS | HL7 (health level 7)
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| FOV | pixel/matrix size
*CR is variable
*DR is not variable
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Created by:
bigad1982
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