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29 Cards in this Set
- Front
- Back
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Intensifying screens _____.
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Emit light
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True or False: Light exposing the film is in direct proportion to the amount and energy of the incident photon upon the screen.
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True
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Which modality was the first to use the principle of digital imaging?
-CT -MRI -Ultrasonography -cardiac catheterization |
CT
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Who was the first to incorporate digital imaging with the CT scanner
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Godfrey Hounsfield
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The first commercial CT scanners could image the _____
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Head only
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In which decade was MRI first introduced?
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1980's
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Teleradiography incorporated ____ to produce radiographic images.
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Telephone lines
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Computed radiography acquires an image through _____
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The use of a storage phosphor plate
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True or False: When switching from a conventional diagnostic radiography room to one that incorporates computer radiography, major equipment changes are to be expected.
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False
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Storage phosphor plates are similar to ____.
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Intensifying screens
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In a digital radiography system, which of the following are needed to produce a radiographic image?
-X-ray absorber and a CCD -Intensifying screen and a TFT -Storage phosphor plate and a CCD -Storage phosphor plate and a TFT |
X-ray absorber and a CCD
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True or False: Like CR, DR can use the existing diagnostic equipment found in today's imaging departments
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False
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True or False: Indirect capture DR converts absorbed x-ray energy into visible light.
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True
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The two elements needed to convert light signals into an electrical signal while using indirect capture DR are TFT and _____.
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Photoconductors
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The x-ray absorber typically used in direct capture DR is a _____.
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Photoconductor
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True or False: A bucky apparatus is required for digital radiography
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False
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Compared with a90-second processing time found in conventional radiography, image acquisition with DR has now been reduced to ____.
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3 to 5 seconds
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In conventional radiography film processing, the sensitivity speck has this electrical charge.
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Negative
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The active element in a storage phosphor is _____.
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Barium fluorohalide
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In reference to CR, to release the latent image, which of the following devices is scanned over the phosphor plate?
-Photomultiplier tube -fluorescent light -focused laser light -lithium crystal |
focused laser light
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Which of the following best describes the sequence for image acquisition using computed radiography?
-phosphor plate, focused laser light scanner, photomultiplier, digital-analog converter, review station -phosphor plate, focused laser light scanner, photodensitometer, digital-analog converter, review station -phosphor plate, focused laser light scanner, photodensitometer, analog-digital converter, review station -phosphor plate, focused laser light scanner, photomultiplier, analog-digital converter, review |
phosphor plate, focused laser light scanner, photomultiplier, analog-digital converter, review station
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X-ray energy related to direct capture DR will stimulate a _____, which eventually is changed into electrical signal
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Scintillator
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The _____ converts x-ray energy directly to a digital electrical signal.
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Photoconductor
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Another name for exposure latitude is _____.
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Dynamic range
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A look-up table maps _____.
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Image gray scale values
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With conventional radiography, optical density is primarily controlled by _____.
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Milliampere-seconds
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Barium fluorohalide phosphor screens have a k-edge at ____ keV.
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37
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True or False: DICOM is a standard that allows imaging modalities and PACS to communicate in the same language.
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True
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All of the following are components of PACS except ____.
-independent KVp and mAs stations -web access -multiple interfaces -reading stations |
independent KVp and mAs stations
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