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Physics Module 3

Vocabulary

TermDefinition
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
Created by: ginaliane