digital radiography and PACS author carter/veale
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| show | imagine plate
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| show | protective layer
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| show | the phosphor or active layer
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| show | the photosimulable phosphor "traps" electrons during exposure; also contains a dye that differentially absorbs the stimulating light to prevent as much spread as possible
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| show | the family in which photostimulable phosphor layer is made from
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| what is the purpose of the REFLECTIVE layer in the CR imaging plate? | show 🗑
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| What is the purpose of the CONDUCTIVE layer in the CR imaging plate? | show 🗑
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| What is the purpose ot the COLOR layer in the CR imaging plate; Where is it w/in the plate? | show 🗑
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| What is the SUPPORT layer do in the CR imaging plate? | show 🗑
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| What is the BACKING layer do in the CR imaging plate? | show 🗑
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| show | Allows the technologist to match the image info w/ the patient-identifying barcode on the exam request. For each new exam the barcode label must be matched w/it's appropriate pt-identifying exam request
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| show | the remnant beam (what didnt get absorbed) interacts w/e`s in the barium fluorohalide crystsal contained w/in the imaging plate. This interaction stimulates(gives energy)e`s in the crystal, allowing them to enter the conductive layer.
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| How is the exposure recorded using CR cont'? | show 🗑
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| show | aka light amplification of stimulated emission of radiation, is a device that creates and amplifies a narrow, intense beam of coherent light.
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| What is a RASTER pattern and where does it occur? | show 🗑
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| show | 100mm wide w/wavelength of 633 nm; helium or solid-state diode. Red laser light is emitted at approximately 2eV and the extra energy allows the trapped e`s to escape the active layer where they emit visible blue light at an energy of 3eV.
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| What is the PHOTOMULTIPLIER? | show 🗑
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| What does "digitizing the signal" refer to? | show 🗑
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| show | Refers to a device or system that represents changing values as continuously variable physical quantities. ex: a wrist watch
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| In the digitizing process... | show 🗑
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| What is a PIXEL? | show 🗑
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| show | One way the image is digitized, by position or spatial resolution. It's the amt of detail present in any image
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| show | the higher the resolution
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| show | ...10-lp/mm ...2.55 to 51-lp/mm
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| Which has better image detail, film/screen or CR? | show 🗑
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| In CR, what is the speed refering to? | show 🗑
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| How often should imaging plates be erased? | show 🗑
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| show | Once imagin plate has been read, the signal is sent to computer, then to the monitor where the technologist can manipulate the image (postprocessing), and send it to the Quality Control (QC) station and ultimately to PACS.
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| Why is is important to select the correct body part and position from the exam menu? | show 🗑
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| show | Chosen for penetration and the type and amount of contrast desired. 45-120 kVp
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| show | to provide the correct number of photons needed for a particular part.
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| Insufficient mAs will cause _______. | show 🗑
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| show | SIZE (pixel size is an amportant factor in determining resolution) and the TYPE
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| show | Will cause a wavy artifact on the image known as MOIRE pattern
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| show | Grid lines that are projected onto the imaging plate when using a stationary grid can interfere w/the image. The grid lines and scanning laser are parallel.
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| What are the four Grid Selection Factors? | show 🗑
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| What is grid ratio? | show 🗑
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| show | number of grid lines per centimeter or lines per inch.
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| show | 103 lines per inch or greater.
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| Most grids chosen by radiography departments are what type? | show 🗑
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| show | Consist of lead strips angled to coincide w/the deversion of the x-ray beam and must be used w/in specific distances using a precisely centered beam.
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| What is a parallel grid? | show 🗑
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| show | the smaller the grid the hight the sampling rate.
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| What is the definition of collimation? | show 🗑
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| show | Through postexposure image manipulation can be accomplished. A black background can be added around the original collimation edges, virtually elliminating the distracting white or clear areas.
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| What does collimation do with the compton effect? | show 🗑
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| show | a numerical representation of the amount of exposure absorbed by the imaging plate, usually the mean value
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| show | Fuji, Phillips, Konica
1mR at 80 kVp has a value of 200
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| Which systems use EI or exposure index? What is the number? | show 🗑
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| show | exposure indicator number
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| show | the amount of radiation the was absorbed by the plate
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| What is lgM? | show 🗑
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| show | a graphic representation of the numerical tone values of an x-ray exposure. Generated by dividing a scanned area into pixels and determining the signal intensity for each pixel; can be calculated for specific anatomy and procedures
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| what is the image data recognition phase for kodak? | show 🗑
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| show | collimation
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| show | exposure data recognition
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| What is automatic data recognition? | show 🗑
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| show | the latitude balue of the histogram is fixed, and only a small reading area is used. NO collimation detection
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| What is Multiple manual selection mode? | show 🗑
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| What does fixed mode do in data recognition and preprocessing? | show 🗑
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