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24 Cards in this Set
- Front
- Back
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The science of _____ is the study of the response of the human eye to light.
a. physiology b. optometry c. photometry d. ophthalmology |
c. photometry
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What is the basic photometric unit?
a. a lumen b. a candela c. a lux d. a nit |
a. a lumen
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The decreasing luminous intensity with increasing distance from the source of light follows _____.
a. the law of gravity b. Murphy’s law c. cosine law d. the inverse square law |
d. the inverse square law
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A digital display monitor is best viewed _____.
a. straight on b. from above c. from below d. at a 30° angle |
a. straight on
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A liquid crystal is a material in a _____ state.
a. solid b. state between a liquid and a solid c. liquid d. state between a liquid and a gaseous |
b. state between a liquid and a solid
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Almost all digital images in medical imaging are viewed and interpreted on a _____.
a. view box b. CRT device c. digital display device d. television monitor |
c. digital display device
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A digital display device with higher megapixels has better spatial resolution.
a. True b. False |
a. True
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Almost all medical flat panel digital display devices are _____.
a. color liquid crystal displays b. monochrome liquid crystal displays c. color CRTs d. monochrome CRTs |
b. monochrome liquid crystal displays
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Medical flat panel display devices are identified by the _____.
a. aperture ratio b. depth of the monitor c. size of the pixels d. number of pixels |
d. number of pixels
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Compared to CRTs, AMLCDs have _____.
a. better contrast b. better gray scale definition c. less intrinsic noise d. all of the above |
d. all of the above
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An advantage to viewing the AMLCD screen is that the image quality is equally good viewed from any angle.
a. True b. False |
b. False
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Preprocessing the digital image is done _____, and post-processing is done _____.
a. automatically, manually b. manually, manually c. manually, automatically d. automatically, automatically |
a. automatically, manually
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Flatfielding is accomplished through automatic calibration images called _____ and _____.
a. magnification, edge enhancement b. offset images, gain images c. image flip, image lag d. image inversion, pixel shift |
b. offset images, gain images
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Reregistering an image to correct for patient motion is done with _____.
a. edge enhancement b. offset images c. pixel shift d. image inversion |
c. pixel shift
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A computation of the mean pixel value within a region-of-interest is performed for _____.
a. quantitative radiology b. edge enhancement c. image inversion d. window and level adjustment |
a. quantitative radiology
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Post-processing includes all of the following except:
a. image inversion b. signal interpolation c. annotation d. pixel shift |
b. signal interpolation
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_____ is corrected by the application of an offset voltage.
a. Spatial resolution b. Line noise c. Image lag d. Misregistration |
c. Image lag
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PACS stands for _____.
a. Processing, Applications, and Computer Storage b. Processing, Archiving, and Computer Storage c. Physician Applications and Communication Systems d. Picture Archiving and Communication Systems |
d. Picture Archiving and Communication Systems
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Which is not a part of PACS?
a. film storage b. a display system c. a network d. image acquisition |
a. film storage
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Within a PACS network the secretarial workstation and the viewing workstation
would both be called _____. a. mainframes b. remote devices c. clients d. DICOMs |
c. clients
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The national standard for image transmission in teleradiology is the _____ format.
a. RIS b. DICOM c. MB d. PACS |
b. DICOM
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Text data and email are generated at a _____ workstation in PACS.
a. Radiology Information System (RIS) b. DICOM c. image acquisition d. archive retrieval |
a. Radiology Information System (RIS)
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Image file size is determined by _____ size and gray scale.
a. RIS b. DICOM c. matrix d. pixel |
c. matrix
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What is the file size of an image with a 1026 × 1026 matrix and a 2.5 byte gray scale depth?
a. 2,565 bits b. 1,053 bits c. 26 MB d. 2.6 MB |
d. 2.6 MB
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