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Advantages/Disadvantages of CR. Rad T 265. Advantages. Potential lower patient dose when utilized properly Higher DQE. Lower repeat rate Better contrast resolution No darkroom costs Edge enhancement Easy storage and retrieval. Disadvantages of CR. Initial costs Lower spatial resolution
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Advantages/Disadvantages of CR Rad T 265
Advantages • Potential lower patient dose when utilized properly • Higher DQE
Lower repeat rate • Better contrast resolution • No darkroom costs • Edge enhancement • Easy storage and retrieval
Disadvantages of CR • Initial costs • Lower spatial resolution • Collimation and centering are critical • Potential for overexposure • Exposure creep
Fuji ‘S’ Value • Inversely proportional of plate exposure • 1 mR at 80 kVp reads as an ‘S’ number of 200. • 0.1 mR equals ‘S’ # of 2000 • 10 mR = ‘S’ # of 20 • Ideal value is between 150 - 250
Kodak exposure index • Directly proportional • 1 mR at 80 kVp = 2000 • 0.1 mR = 1000 • 10 mR = 3000 • Properly exposed • 1800 - 2200
Underexposure with CR • Will produce quantum mottle • This is why overexposure is ‘better’ • Overexposure produces decreased contrast. • Think processor that is too hot.