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Physics Module 3
Vocabulary
Term | Definition |
---|---|
transmitter | Modifies the electrical current (from the outlet) and can produce electrical waveforms of variable amplitudes and frequencies to drive the various transducers used |
pulser | The pulser controls the electrical signals sent to the piezoelectric crystals and determines PRF, PRP, pulse amplitude, pulse duration |
beam former | pulser in phased array systems |
receiver | component of the ultrasound system that detects, receives, and processes the echo voltage signals |
detection & reception | detects the raw RF signals and sends them through a processing chain |
amplification | amplifies all RF signals equally |
compensation | Compensates for attenuation |
compression | decreases the difference between the smallest amplitude and the largest amplitude |
dynamic range | range of echo signal amplitudes that can be processed by a component of the ultrasound system |
demodulation | changes the echo signal from an RF signal to a video signal that can be displayed; aka rectification & smoothing |
rejection | Also called Suppression, Reject, Threshold or Filter - rejects all echo signal components that fall below a certain adjustable level (or threshold). |
signal to noise ratio | Specifies the signal quality |
scan converter | the memory of the ultrasound system |
display | the monitor of the ultrasound system |
storage | external storage of ultrasound information (paper, CD’s, film, PACS) |
master synchronizer | the computer (CPU Board) or brain of the ultrasound system |
power | the rate at which energy is transferred |
intensity | the concentration of power per unit area |
cathode ray tube | a high-vacuum tube in which cathode rays produce a luminous image on a fluorescent screen, used chiefly in televisions and computer terminals |
liquid crystal display (LCD) | the technology used for displays in notebook and other smaller computers |
A-mode | amplitude mode, shows the strength of the returning echo as a spike |
B-mode | brightness mode, shows the strength of the returning echo as a bright spot |
C-mode | constant depth mode, shows blood flow velocity over time |
M-mode | motion mode, shows motion over time |
volumetric scanning | acquires and displays information in the elevation dimension |
voxel | 3-D picture element (pixel) with a length, width, and thickness |
scan conversion | the ability to convert from a-mode signals to b-mode signals |
B-scan | a compilation of b-mode lines |
real-time imaging | the production of a series of images that are displayed in a rapid sequence creating the impression of continuous motion |
raster scan | |
interlaced | |
non-interlaced | |
bistable | |
gray scale display | |
digital scan converter | |
scanning speed limitation | |
composite time | |
line density | |
persistence | |
parallel processing | |
compound imaging or crossbeam | |
panoramic imaging | |
spatial resolution | |
contrast resolution | |
signal compression | |
signal to noise ration (SNR) | |
frame averaging | |
spatial averaging | |
analog to digital conversion | |
preprocessing | |
postprocessing | |
digital to analog conversion | |
binary | |
decimal | |
bit | |
byte | |
random access memory (RAM) | |
freeze frame | |
cine loop | |
zoom or magnification | |
write (acoustic) zoom | |
read (non-acoustic) zoom | |
region of interest (ROI) | |
tissue colorization | |
trace or ellipse tool | |
speckle tracking | |
hard copy film | |
thermal printer | |
laser imager | high-resolution multi-format films directly from diagnostic radiology procedures image data |
PACS | Picture Archiving and Communication Systems |
teleradiology | the electronic transfer of images and reports from one location to another |
transmitter | |
pulser | |
beam former | |
receiver | detection & reception |
detection & reception | |
amplification | |
compensation | |
compression | |
dynamic range | |
demodulation | |
rejection | |
signal to noise ratio (SNR) | |
scan converter | display |
display | |
storage | |
master synchronizer | |
power | the rate at which energy is transferred |
intensity | the concentration of power per unit area |