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RADT Unit 3 > History of Computed Radiography > Flashcards

History of Computed Radiography Flashcards

1
Q

When was computed radiography commercially introduced?

A

1983 by Fuji

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2
Q

CR technology is based on certain halide-based phosphors having energy storage and excitation characteristics known as____________

A

Photostimulable luminance (PSL)

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3
Q

Photostimulable luminance (PSL) does 2 things:

A
  1. Enable phosphors to store x-ray energy temporarily
  2. Release that energy upon excitation by a red laser beam
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4
Q

_______________ is positioned within the cassette or____________

A
  • Photostimulable storage
    phosphor (PSP)
  • Imaging plate (IP)
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5
Q

Commonly used phosphor material for PSP is ________

A

barium fluorohalide

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6
Q

The phosphor particles are bonded with a cohesive material forming ____________ and deposited on a base for _________

A
  • turbid structure
  • mechanical support
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7
Q

When Photostimulable phosphor (PSP) screen is exposed to x-rays, a ______ of that energy is stored.

A

fraction

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8
Q

After exposure the IP is inserted into a _____________

A

CR Reader

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9
Q

The IP is processed by a scanning system or reader which:

A
  1. Extracts the (PSP) screen from the cassette
  2. Moves the screen across a high intensity scanning laser beam
  3. Blue-violet light is emitted via photostimulable luminescence (PSL)
  4. Light energy/signal (analog) is intensified by a photomultiplier tube
  5. The analog signal is changed into an electric/digital signal by an analog to digital converter
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10
Q

Analog signal is converted to a digital format for ____________, ___________,__________, and ___________ if desired.

A
  • manipulation
  • enhancement
  • viewing
  • printing
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11
Q

PSP screen is erased by a ________ inside the reader, reloaded into cassette, and is ready for the next exposure.

A

bright light

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12
Q

Entire process of CR image processing is ________.

A

20 seconds

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13
Q

A _______________dumps all the remaining energy traps allowing the plate to be re-used thousands of times. (Approx up to ___________ before a new phosphor is needed)

A
  • High intensity white light
  • 10,0000 times
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14
Q

Could erase by placing against _______ for several minutes

A

viewbox

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15
Q

Additional Equipment include:

A
  • CR reader
  • Imaging plates and cassettes
  • QC workstation
  • Diagnostic workstation/viewer
  • Laser printer
  • Archive server
  • Web server
  • Film digitizer
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16
Q

CR reader replaces:

A

darkroom, processor, and chemicals

17
Q

Diagnostic viewer replaces:

A

film, storage, and view boxes

RADT Unit 3 (4 decks)

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