Pulse Echo Flashcards
changing values of continuously variable physical quantities
Analog
Echoes returning from the body are weak from attenuation, treats all echoes equally.
Amplification
Converts voltage amplitude to a number, suitable for computer memory
Analog to digital converter
Determines focus, shape and steer of the beam for array transducers
Beam Former
something that can rest in two states (flip flop in electronics)
Bistable
basic unit of information in a computer and digital communication
Bit
specialized vacuum tube in which images are produced when an electron beam strikes aphosphorescent surface.
Cathode-ray tube
can improve the signal to noise ratio
Coded excitation
increases amplification at varying depths (TGC, DGC)
Compensation
decreases the difference between the largest and smallest voltages or echo amplitudes.
Compression
The ability to distinguish between signal sizes
Contrast resolution
Makes image suitable for display
Radio frequency converts to video form
Demodulation
DGC- Compensates for sound beam attenuation due to different depths of the structure
Depth Gain Compensation
converts processed image video data into analog signals suitable for TV video display
Digital to analog converter
ratio of the largest to smallest amplitude or power that a system can handle
Dynamic range
the number of sonographic images stored into memory per second
Frame rate
Ratio of amplifier output to input electrical power
Gain
range of shades of gray
Gray scale
after echo data is aquired and converted to proper video format image frames are stored here
Image memory
an electronic device that reformats echo data into image form
Image Processor
averaging of sequential frames together to get a smoother image
Persistence
Picture archiving and communications system
allows electronic images to be sent to work stations of site
PACs
a single point in a graphic image
Pixel
Image processing after the scan converter memory
Postprocessing
