image capture. x-ray x-ray generation film can be exposed directly to x-ray, but sensitivity is very...
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![Page 1: Image Capture. X-Ray X-Ray Generation Film Can be exposed directly to x-ray, but sensitivity is very low Nitrate – 1910s to 1930s Acetate – 1920s to](https://reader030.vdocument.in/reader030/viewer/2022032414/56649ef45503460f94c07448/html5/thumbnails/1.jpg)
Image Capture
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X-Ray
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X-Ray Generation
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Film
Can be exposed directly to x-ray, but sensitivity is very low
• Nitrate – 1910s to 1930s• Acetate – 1920s to mid 1960s• Polyester – mid 1950s to present
TopcoatEmulsionAdhesive
Base
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Intensifying Screens
Intensifying Screen
Intensifying Screen
Intensifies available x-ray light
X-rays
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Film PACS
Film is the detector and storage…..“The PACS”
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Digital Imaging
• Ultrasound
• Nuclear Medicine
• Computed Tomography
• Magnetic Resonance
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Computed Radiography
Digital Image Capture
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• Expose plate
• Drop into Reader
• PMT scans plate
• Converts to Digital
• Sends to monitor
Secondary Capture DR
CR is Digital
Digital Image Capture - CR
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Imaging PlateExcited Phosphor High Energy
Low Energy
X-ray Energy
Digital Image Capture - CR
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High Energy
Low Energy
Laser Scanning
Creating Visible Light, Digital Capture
Excited Phosphor
Digital Image Capture - CR
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High Energy
Low Energy
Bright White Light
Excited Phosphor
Digital Image Capture - CR
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Flat Panel Detector
Digital Image Capture
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Image Capture - DR
• Flat Panel Detector
• Image info captured
• Converts to Digital
• Sends to monitor
DR is Digital
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TFT Array
CsI
Photodiode
X-rays
TFT Array
GOS
Photodiode
X-rays
Discussion of CsI vs. GOS
Csi focuses scintillator light to TFT
High Image quality
GOs scatters produced light to TFT causing reduced image quality
Flat Panel Technology - Cross Section
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Technology Review
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Flat Panel Technology - Cross Section
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Digital Image Capture - Flat Panel
8 Million
X-ray Energy
High Energy
Low Energy
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High Energy
Low Energy
X-ray Energy
8 Million
Digital Image Capture - Flat Panel
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Digital Radiography
Performance
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4096
Imaging Performance
Digital R
eceptors
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4096
Speed
Digital R
eceptors
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Digital Radiography
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Image Generation - Today
Using 100 yr old technology……Vacuum Tubes
• Heats a negatively charged metal filament to1000º C• Combination of heat and charge releases electrons• Strikes a positively charged electrode• X-rays created by the energy of the impact
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Image Generation - Future
Electron Field Emission
• A myriad of carbon nano-tubes on a platform
• Compact source of x-rays that can be controlled with great precision, built into an array
• Each element programmed to fire when required
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Thank You