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28 Cards in this Set
- Front
- Back
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Digital fluoroscopy uses _____ monitor(s).
a. 1 b. 2 c. 3 d. 4 |
b. 2
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The time it takes to turn on the digital fluoroscopy x-ray tube and reach the selected mA and kVp is the _____ time.
a. interrogation b. extinction c. radiographic d. acquisition |
a. interrogation
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A charge-coupled device used in digital fluoroscopy provides high _____.
a. spatial resolution b. signal-to-noise ratio c. detective quantum efficiency d. all of the above |
d. all of the above
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Digital fluoroscopy with a charge-coupled device has lower _____ and higher _____ than conventional fluoroscopy.
a. light sensitivity, patient dose b. patient dose, light sensitivity c. detective quantum efficiency, maintenance d. signal-to-noise ratio, patient dose |
b. patient dose, light sensitivity
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A principal advantage of digital fluoroscopy is the _____.
a. dynamic range b. image acquisition rate c. image subtraction d. progressive mode |
c. image subtraction
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Digital fluoroscopy energy subtraction has less _____ than temporal subtraction.
a. complexity b. x-ray intensity c. kVp switching d. motion artifact |
d. motion artifact
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Image integration results in _____.
a. increased patient dose b. decreased patient dose c. decreased contrast resolution d. increased noise artifact |
a. increased patient dose
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Energy subtraction technique takes advantage of the difference in _____ during contrast injection.
a. tissue density b. K-edge absorption c. Compton scatter d. patient thickness |
b. K-edge absorption
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Digital fluoroscopy systems with hybrid capabilities use both _____.
a. interlace and progressive modes b. high mAs and low mass techniques c. temporal and energy subtraction d. charge coupled devices and TV monitors |
c. temporal and energy subtraction
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Remasking may be required due to _____.
a. noise artifacts b motion artifacts c. technical factors d. any of the above |
d. any of the above
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.In mask mode, the _____ image is shown on monitor B, and the _____ image is shown on monitor A.
a. mask, subtracted b. subtracted, mask c. hybrid, mask d. subtracted, hybrid |
b. subtracted, mask
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The combination of temporal and energy subtraction techniques is called _____.
a. interlacing mode subtraction b. hybrid subtraction c. dual subtraction d. superimposition |
b. hybrid subtraction
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The time-interval delay mode is principally used in _____ imaging.
a. renal angiography b. barium enema c. cardiac d. run-off |
c. cardiac
(TID) |
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Digital fluoroscopic dose rate is lower than that for continuous analog fluoroscopy.
a. True b. False |
a. True
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Hybrid imaging can produce the highest-quality digital fluoroscopy images only if _____.
a. remasking is employed b. energy subtraction is used c. patient motion is controlled d. remasking is completed |
c. patient motion is controlled
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Spatial resolution is limited by _____
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pixel size
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During DF, the under table x-ray tube actually operates in the __________ so the tube current (mA) resembles radiographic mA rather than the low mA with conventional fluoroscopy.
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radiographic mode
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DF images are obtained by ______ the x-ray beam
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pulsing
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The fraction of the time that the x-ray tube is energized is called the_______
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duty cycle
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True or False
A warm up is required for CCDs in medical imaging. |
False
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CCD response is a _____ response
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linear
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The _______ mode of reading the target of the TV camera can degrade a digital image.
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interlaced
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TV cameras are noisy. SNR of 200:1; _______is needed for DF
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1000:1
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Background current flowing in any circuit is __________
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electronic noise
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CRT stands for
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Cathode Ray Tube
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DSA stands for
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digital subtraction angiography
(DSA) |
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Misregistration/Reregistration has to do with
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motion
Improper alignment |
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Teleradiology refers to _________ of images.
a. long-term storage b. realtime viewing c. remote transmission d. telephone transmission |
c. remote transmission
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