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37 Cards in this Set
- Front
- Back
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Increasing frame rate improves what?
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Temporal resolution
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Real time imaging is accomplished through what?
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Electronic transducer arrays
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Image processing after memory that includes everything from ADC to Digital to analog.
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Post processing
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Read magnification is an example of what?
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Post processing
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The rapid, sequential display of u/s images resulting in a moving presentation.
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Real time imaging
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Opthalmology uses what mode?
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A mode
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Image processing performed on image data retreived from memory, determines how memory appears on display.
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postprocessing
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How is 3D echo data displayed?
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2-D slices, surface renderings, & transparent views.
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What do color displays offer?
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MOre contrast resolution--
B color or Color scale |
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Cannot be performed on frozen images.
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Preprocessing
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A form of postprocessing that improves contrast resolution by assigning colors rather then gray shades to echoes.
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B color
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Brightness mode used in clinical settings
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B-mode, B scan, or gray scale sonography.
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Generates a sharply focused beam of electrons that produces a spot of light on the tube.
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CRT
(cathode ray tube) |
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displays brightness to numbers retrieved from memory that is operator controlled.
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postprocessing
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The number of images presented per second on a display.
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Refresh rate
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What is the common display used to present an image by scanning a spot of light in horizontal lines.
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CRT
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# of images stored per second, and limited by the refresh rate.
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Frame rate
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What is the refresh rate on a display?
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60Hz
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A CRT that presents data retrieved from memory in a 2-D matrix, refreshing the screen often.
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Computer monitor
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LCD using groups of red, blue, green yeilding more color presentations.
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Flat panel display
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Ability of a display to distinguish closely spaced events in time rapidly & correctly.
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Temporal resolution
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What happens to temporal resolution as frame rate increases?
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Temporal Res increases
(less time elapses from 1 frame to the next) |
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# of foci, lines per frame, and frame rate combined are required to computate what?
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PRF
(n x LFP x FR (hz)) |
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Time and frequency are related in what way?
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They are reciprocals
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When lines per frame increase, what happens to PRF?
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Increases
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What happens with PRF if the frame rate increases?
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Increases
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If penetration increases, what happens with the PRF?
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decreases
(In order from one pulse to be received b4 next one sent out) |
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Decrease frequency, penetration is increased, and PRF does what to avoid echo misplacement.
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decrease
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if penetration increases, frame rate..
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decreases
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If number of foci increases, frame rate,,,
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decreases
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If the lines per frame increases (FOV), frame rate..
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decreases
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1/2 the speed of u/s in tissues
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77,000 cm/s
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Temporal resolution in M and A modes is equel to?
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PRF
(each pulse produces a new line of echo info.) |
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Temporal resolution depends on what?
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Frame rate
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Frame rate depends on what?
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Depth, lines/frame, # foci
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M-MOde displays what?
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Depth vs. time
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A mode displays
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Depth vs Amplitude
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