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Electronic Imaging
Electronic Imaging Test
| 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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