CR and DR ppt
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Transcript of CR and DR ppt
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Prepared by, Shonima
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DIGITAL PROJECTION RADIOGRAPHY
COMPUTED RADIOGRAPHY (CR) DIGITAL RADIOGRAPHY (DR)
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COMPUTED RADIOGRAPHY (CR)
• Been around since 1980-81• Uses same radiographic equipment• Uses an imaging plate• Need a cassette reader• Very similar to conventional radiographic cassette.• Same amount of time to produce the image as with
film processing time• Increased exposure
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CR SYSTEM
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CR PLATE
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CASETTE CONSTRUCTION
• Light weight aluminum• Plastic• Steel frame• Front panel made of low attenuation carbon fiber• Back panel contains lead foil to protect the plate from
backscatter. • Back panel also contains chip to record patient
demographic information.
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CROSS-SECTION OF CR PLATE
ANTI-HALO & REFLECTIVE LAYER
PROTECTIVE LAYER
PHOSPHOR LAYER
BASE
BACKING LAYER
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DIGITAL RADIOGRAPHY (DR)
• Works like a digital camera• Two options
– CCD– Digital flat plate detector
• Can be sent to PACS
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DIGITAL FLAT PLATE DETECTORS
• Expensive ($80,000-120,000)
• Exposure is decreased thus improving radiation safety
• Do not use grid but use image software
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CCD
• Is sold with an X-ray machine• Camera is placed in machine before install – fits
underneath the table• Less expensive than the Flat Plate Detector • Cause increase in exposure by 2 times
– Double the mAs
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ADVANTAGES OF DR
• No film costs• No darkroom space• No processor to maintain• No films to search for or file• No expense for film jackets• Increased productivity• Decreased retakes• Decreased exposure
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DR PORTABLE SYSTEM
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Radiology 1895 Radiology 2001
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DR IMAGING TECHNIQUE
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COMPARISON
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MANUFACTURERS
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DIGITAL RADIOGRAPHY
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HF X-RAY
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CR MANUFACTURERS
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MARKETING
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VIDEOS
• https://www.youtube.com/watch?v=V9Mi8tqGQlo
• https://www.youtube.com/watch?v=Bc0eOjWkxpU
• https://www.youtube.com/watch?v=upogkGz6D6U
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