Computed radiography
Updates to Article Attributes
Computed radiography (CR) is the use of photostimulable phosphor as an image receptor. The image receptor is held in a similar casing (cassette) to that of the traditional film screen. CRComputed radiography harnesses the absorption of radiation, trapping electrons at energy levels via the process of photostimulable luminescence.
Electron storage
The CRcomputed radiography plate has a thin layer of phosphor grains, known as a photostimulable phosphor. The plate is exposed to x-ray radiation exciting the phosphor, exciting the electrons to be trapped in the lattice until inevitably they are stimulated by the second round of illumination.
Analog to digital conversion
The CRcomputed radiography plate is exposed to a small, high-intensity laser resulting in the previously trapped electrons to return to their respective valence bands, letting off violet light.
A photomultiplier tube will interpret this light and convert it into an electric signal that, via an analog-to-digital converter (ADC) is digitised and mapped onto a pixel matrix.
Using a white light, the CRcomputed radiography plate can be 'reset' indicating, thus they can be used over and over againreused repeatedly if carefully handled.
-<p><strong>Computed radiography (CR) </strong>is the use of photostimulable phosphor as an image receptor. The image receptor is held in a similar casing (cassette) to that of the traditional film screen. CR harnesses the absorption of radiation, trapping electrons at energy levels via the process of photostimulable luminescence. </p><h5>Electron storage</h5><p>The CR plate has a thin layer of phosphor grains, known as a photostimulable phosphor. The plate is exposed to x-ray radiation exciting the phosphor, exciting the electrons to be trapped in the lattice until inevitably they are stimulated by the second round of illumination. </p><h5>Analog to digital conversion</h5><p>The CR plate is exposed to a small, high-intensity laser resulting in the previously trapped electrons to return to their respective valence bands, letting off violet light.</p><p>A photomultiplier tube will interpret this light and convert it into an electric signal that, via an analog-to-digital converter (ADC) is digitised and mapped onto a pixel matrix.</p><p>Using a white light, the CR plate can be 'reset' indicating they can be used over and over again if carefully handled.</p>- +<p><strong>Computed radiography (CR) </strong>is the use of <a title="Photostimulable phosphors" href="/articles/photostimulable-phosphors">photostimulable phosphor</a> as an image receptor. The image receptor is held in a similar casing (cassette) to that of the traditional film screen. Computed radiography harnesses the absorption of radiation, trapping electrons at energy levels via the process of photostimulable luminescence. </p><h5>Electron storage</h5><p>The computed radiography plate has a thin layer of phosphor grains, known as a photostimulable phosphor. The plate is exposed to <a title="X-rays" href="/articles/x-rays-1">x-ray radiation</a> exciting the phosphor, exciting the electrons to be trapped in the lattice until inevitably they are stimulated by the second round of illumination. </p><h5>Analog to digital conversion</h5><p>The computed radiography plate is exposed to a small, high-intensity laser resulting in the previously trapped electrons to return to their respective valence bands, letting off violet light.</p><p>A photomultiplier tube will interpret this light and convert it into an electric signal that, via an analog-to-digital converter (ADC) is digitised and mapped onto a pixel matrix.</p><p>Using a white light, the computed radiography plate can be 'reset', thus they can be reused repeatedly if carefully handled.</p>
References changed:
- 1. Stewart C. Bushong. Radiologic Science for Technologists: Physics, Biology, and Protection. (2012) ISBN: 9780323081351
- 2. Arnulf Oppelt. Imaging Systems for Medical Diagnostics: Fundamentals, Technical Solutions and Applications for Systems Applying Ionizing Radiation, Nuclear Magnetic Resonance and Ultrasound. (2006) ISBN: 9783895782268
- 1. Stewart C. Bushong. Radiologic Science for Technologists. ISBN: 9780323081351
- 2. Arnulf Oppelt. Imaging Systems for Medical Diagnostics. ISBN: 9783895782268
Sections changed:
- Imaging Technology
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