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| information system for ordering exams and reporting results |
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| picture archiving and communication system, digital acquisition, display workstations, and storage of images |
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| moving images digitally through phone lines to remote locations |
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| digital imaging and communications in medicine |
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| the unseen image on the imaging plate before being processed |
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| final image seen after processing |
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| durable lightweight plastic, back by thin aluminum (absorbs x-rays), antistatic material (protects against static and dust |
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| what are the 7 layers of the PSP or imaging place |
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Definition
| protective layer, phosphor layer, reflective layer, conductive layer, support layer, backing layer, barcode label |
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| thin, tough, clear plastic that protects phosphor layer |
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| photostimulable phosphor (barium fluorohalide) traps electrons during exposure |
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| sends light in a forward direction when released in the cassette reader (black to reduce spread of light) |
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| material that absorbs and reduces static electricity |
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| semigrid material that gives the imaging sheet strength |
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| soft polymer that protects the back of the cassette |
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| a window with the label allows the tech to match the image information with the patient |
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| remnant beam interacts with BaFl crystals, energy to electrons, electrons go to conductive layer, electrons trapped in phosphor center, trapped signal remains for hours, photostimulable luminescence |
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| the analog to digital converter, now the digital data is ready for processing, display, and storage |
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| build up of background signal can create a ghost image |
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| rows and columns of pixels (512x512 or 1024x1024) |
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Definition
| number of bits per pixel (if a pixel has a bit depth of 8 then the number of gray tones that pixel can show is 2 to the 8th power) |
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| how many shades of gray can the human eye recognize |
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Definition
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| the spatial resolution or detail on an image is the result of what? |
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| how many pixels are in the matrix (more is better) |
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| how to digitize an analog signal |
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Definition
| light signal from each pixel gets a numeric value, the phosphor storage center is scanned and the released electrons get assigned a number based on brightness |
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| the analog image is digitized based on two things |
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Definition
| its position in the matrix and its intensity |
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| what is the exposure indicator |
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Definition
| the S(sensitivity) number |
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| what is the ideal S number |
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Definition
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| how are S number and mAs related |
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Definition
| high S number means you need more mass, low S number means you used too much mass |
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Definition
| a graphic representation of pixel values |
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| what do the x and y-axis represent on a histogram |
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Definition
the x-axis= amount of exposure read
the y-axis= number of pixels for each exposure |
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Definition
| when the computer assigns the same value to a dead pixel as the pixel next to it |
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