digital radiography and PACS author carter/veale
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| show | imagine plate
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| what is the very thin, tough, clear plastic that prtects the phosphor layer? | show 🗑
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| where in the imaging plate is the PHOTOSTIMULABLE PHOSPHOR located? | show 🗑
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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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| what is BARIUM FLUOROHALIDE? | show 🗑
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| what is the purpose of the REFLECTIVE layer in the CR imaging plate? | show 🗑
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| show | absorbs and reduces sttic electricty
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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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| What is the purpose of the BARCODE LABEL/BARCODE STICKER on the CR imaging plate? | show 🗑
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| How is the exposure recorded using Computed Radiography? | show 🗑
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| show | In the conductive layer the electrons are trapped in crystals of the color/phosphor center. The trapped signal will remain for hours or days. trapped signal is never completely lost
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| What is the purpose of the LASER? | show 🗑
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| show | When the cassette is put into the reader, the imaging plate is extracted and scanned w/a helium laser beam or solid-state diodes.The pattern is from left to right, returns back to left, scans left to right, returns back to left...
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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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| show | Electronic device that amplifies light and sends it to a digitzer.
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| What does "digitizing the signal" refer to? | show 🗑
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| That does "analog" refer to? | show 🗑
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| In the digitizing process... | show 🗑
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| show | Each square that gets digitized. Typical # pixels in a matrix ranges fr: 512X512 to 2500X2500. The more pixels-the higher image resolution.
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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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| The thinner the phosphor layer... | show 🗑
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| show | ...10-lp/mm ...2.55 to 51-lp/mm
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| show | Film screen
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| show | Time it takes the laser beam to read the imaging plate which is roughly equivalent to 200 speed film/screen. The "speed" is a reflection of the AMOUNT of photstimulable luminescence (PSL) given off by the imaging plate while being scanned by the laser.
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| How often should imaging plates be erased? | show 🗑
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| Wht is involved in the Preprocessing, Processing and Forwarding the Image? | show 🗑
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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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| Kilovoltage Peak is chosen for what? Value range? | show 🗑
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| What is mAs selected for? | show 🗑
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| Insufficient mAs will cause _______. | show 🗑
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| What are the two factors to be considered when selecting a CR imaging cassette? | show 🗑
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| What happens when the grid chosen is unaligned? | show 🗑
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| What causes the moire effect? | show 🗑
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| show | Grid frequency, Grid ratio, Focus, Size
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| show | the height of the lead strips to the distance between the strips. Higher the ratio-the more scatter radiation is abosorbed by the lead strip
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| What is Grid frequency? | show 🗑
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| What is the recommended grid frequency for digital imaging receptors? | show 🗑
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| show | Parallel and focused
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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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| show | Are less critical to beam centering but should not be used at distances less than 48 inches.
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| show | the smaller the grid the hight the sampling rate.
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| show | the reduction of the area of beam that reaches the patient through the use of two pairs of lead shutters encased ina housing attached to the x-ray tube.
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| What is shuttering? | show 🗑
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| show | Decreases compton scattering?
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| what is the exposure indicator number? | show 🗑
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| Which systems use S for their exposure indicator number? What is the number? | show 🗑
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| show | Kodak 1mR @ 80 kVp aluminum/copper filter yield value of 2000
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| The amount of light given off by the imaging plate is a result of the radiation exposure the plate has received. The light converted into a signal that is used to calculate _________ | show 🗑
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| What does the exposure indicator number measure? | show 🗑
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| show | logarithm of the median expousure; term used to express exposure to the imaging plate
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| what is a histogram? | show 🗑
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| show | Segmentation
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| what is the image data recognition phase for Agfa? | show 🗑
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| what is the image data recognition phase for Fuji? | show 🗑
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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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| show | The user selects the exposure index, or sensitivity number, and the value of the latitude from a menu.
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