Display and artifacts
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
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| What are the acceptable ways to divide the CR plate to make multiple exposures? | show 🗑
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| show | *Motion
*patient artifacts
*improper positioning/clipped anatomy
*quantum mottle
*double exposure (CR)
*grid lines/cutoff
*moire effect
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| show | Digital Imaging and Communications in Medicine -
international standard to transmit, store, retrieve, print, process, and display medical imaging information
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| What is HL7? | show 🗑
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| show | Society of Motion Picture and Television Engineers
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| show | American Association of Physicists in Medicine
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| show | National Electronics Manufacturer's Association
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| How is QC of electronic display devices performed? | show 🗑
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| What does a Display Test Pattern evaluate? | show 🗑
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| What is geometric distortion? | show 🗑
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| show | involves evaluating overall appearance of pattern - look for dropped pixels (no brightness, appears as a dark space that doesn't change location w/diff images)
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| show | verification all 16 luminance patches are distinctly visible from adjacent patches
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| What is resolution? | show 🗑
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| What is ambient light and what is standard? | show 🗑
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| Are you able to visually identify a monitor test pattern? | show 🗑
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| Describe procedure for QC displays? Papp p 187-188 | show 🗑
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| show | (luminance dependencies) - relationship between display luminance and input values from standard display systems (test pattern)
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| show | viewing angle between observer and center of display - no less than 80' for LED screen
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| What is spatial/geometric distortion in QC of displays? | show 🗑
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| show | verify contrast patterns are visible both in white and black squares; verify proper contrast balance available within image
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| What is spatial resolution ? | show 🗑
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| show | uniformly gray across entire display
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| What is display artifacts? | show 🗑
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| What is display reflection? | show 🗑
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| Which display is best luminance (brightness)? | show 🗑
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| What is reject and repeat analysis program (RAP)? | show 🗑
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| show | increased department efficiency; decreased department cost; decrease patient dose (most important)
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| What is an artifact? | show 🗑
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| show | b/c may be produced by CR system itself; users not using proper image techniques or selecting appropriate imaging protocols
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| show | because the IP is very sensitive to scattered radiation
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| show | artifacts can obscure important anatomy; picture looks bad; cannot be corrected by any image processing algorithm
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| List some Image Plate artifacts. Papp p 137-139 | show 🗑
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| What are digital radiography artifacts? | show 🗑
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| are you familiar with appropriate collimation when making more than one exposure on a CR plate? | show 🗑
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| show | *motion - involuntary/voluntary
*patient artifacts - removable/not removable
*improper positioning or anatomy
*quantum mottle
*double exposure (CR plates)
*grid lines/cutoff (angel hair pasta)
*Moire effect (Nyquist frequency)
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| show | *Heat Blur - CR
*Improper image brightness (incorrect algorithm)
*Electronic noise
*Quantum mottle
*Phantom image
*Scatter
*Dbl exposure
*Foreign Objects
*Dropped pixel
*Halo artifacts
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| What is heat blur? | show 🗑
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| What is Improper image brightness? | show 🗑
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| show |
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Created by:
Larobbins
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