Electronic Imaging Word Scramble
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Question | Answer |
measurement of the luminance of a monitor calibrated in units of candela per square meter on monitor or soft copy | brightness |
density differences | contrast |
picture element | pixel |
controls number of shades of gray that can be visualized -formula=2 to the nth(n=number of bits) | bit depth |
what can bit depth be limited by | dynamic range & quantization |
range of exposures that may be captured by a detector | dynamic range |
bits per pixel | quantization |
step by step procedure for software function | algorithm |
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 |
PMT | (photo multiplier tube)-converts low level of light to higher level or A-D) |
rows and columns of pixels | matrix |
the sharpness of structural edges recorded in the image | spatial resolution |
what factors is spatial resolution dependent upon | *pixel/matrix size *pixel pitch *bit depth |
space from center of a pixel to center of the adjacent pixel | pixel pitch |
number of pixels/mm | pixel density |
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 |
PACS | picture archiving communication system |
what methods of storage are used with digital images | *hard drive *dvd/cd *hologram *down-time flash drive |
RAID | redundant array of inexpensive discs -(jukebox)hard drive used to archive digital images |
hard drive used to archive digital images | optical laser disc drive |
what two type of computer monitors are used | *LCD(liquid crystal display) *CRT(cathode ray tube) |
what is the PACS system used at Halifax | DR-dominator radiology |
*no loss of information *3:1 compression ratio | lossless compression |
*some loss of information, but likely not noticeable *5:1 ratio | nearly lossless compression |
*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 |
*most compressed and fastest working *gray scale reduced to about 256 shades of gray *similar to jpeg images | lossy medium quality compression |
hard copy images from digital data | laser film |
used to burn digial images on to disc for patients | cd/dvd burner |
RIS | radiology information system(PACS) |
HIS | hospital information system(meditech) |
LUT | (look up table) *term used for image that is initially displayed after aquisition |
DICOM | (digital imaging and communication in midicine) *for imaging systems to transfer images |
*must be met for HIS to transmit information and populate patient data in RIS | HL7 (health level 7) |
FOV | pixel/matrix size *CR is variable *DR is not variable |
Created by:
bigad1982
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