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Chapter 02: Visibility of Details
Martensen: Radiographic Image Analysis, 5th Edition
MULTIPLE CHOICE
• The light collected and converted to an electrical signal by the photomultiplier tube
(PMT) during CR image sampling is then sent to the to be digitized.
• ADC (analog-to-digital converter)
• DAC (digital-to-analog converter)
• LUT (lookup table)
• workstation
ANS: A
• What is the location on a histogram graph of air/gas?
• Center
• Far right
• Left
• Right
ANS: D
• What is the location on a histogram graph of background brightness?
• Center
• Far right
• Left
• Right
ANS: B
• What is the location on a histogram graph of bone?
• Center
• Far right
• Left
, • Right
ANS: C
• What is the location on a histogram graph of contrast/metal?
• Center
• Far right
• Far left
• Right
ANS: C
• What is the location on a histogram graph of fat?
• Center
• Far right
• Left
• Right
ANS: D
• What is the location on a histogram graph of soft tissue?
• Center
• Far right
• Left
• Right
ANS: A
• All of the following may result in histogram analysis errors except
• unusual pathologic conditions.
• poor positioning.
• motion.
• alignment of the anatomic part with the IR.
ANS: C
• All of the following are guidelines for producing optimal image histograms except
• choose the correct body part and projection from the workstation menu.
• leave minimal background in the exposure field through tight collimation.
• use the smallest possible IR and cover at least 50% of it.
• erase the imaging plate if the IR has not been used for a few days.
ANS: C