Pulse-Echo Flashcards
(31 cards)
Relating to or using signals or information represented by a continuously variable physical quantity such as spatial position or voltage.
Analog
Increases the strength of all electrical signals in the receiver prior to further processing (receiver gain)
Amplification
A signal processing operation where the amplified voltage signal representing an ultrasound echo is converted into a binary number
Analog to digital conversion
This introduces a set of time delays across the individual elements
Beam Former
This means the system has two stable equilibrium states. Something that is bistable can be resting in either of the two states. These rest stays need not be symmetric with respect to stored energy.
Bistable
A display device
Cathode-Ray Tube
Creating very long sound pulses containing a wide range of frequencies, distributing energy over a broad frequency range
Coded Excitation
This is used to make the image uniformly bright from top to bottom.
Compensation.
The phase of the wave when the molecules are pushed together.
Compression
The ability of the imaging system to differentiate between body tissues and display them as different shades of gray.
Contrast Resolution
Retains the actual amplitudes of echo voltages
Demodulation
To allow for greater amplification of the weaker echoes returning from deeper within the body
Depth-Gain Compensation
And electronic device for converting digital signals to analog form
Digital to analog converter
This allows the range of echoes or shades of gray displayed on the screen to be decreased. This will remove low-level echoes from the display and result in an image with more contrast.
Dynamic Range
______ = PRF / Lines per Frame. Depends on the PRF and the number of scan lines per image.
Frame Rate
The degree of amplification of the returning echo is called this. Echo or signal amplification is necessary because the returning echoes are too weak to be displayed in visualized. Echoes can be strengthened by increasing the intensity of the transmitted signal or by increasing the amplification of the returning signal.
Gain
Allows each echo of varying degrees of amplitude to be displayed within the same image.
Gray scale
Stores a number of sequentially acquired and processed static image frames every second which are rapidly sent to the display to provide dynamic real-time ultrasound
Image Memory
This formats the many scanline data into form.
Image Processor
This is an averaging of sequential frames together to get a smoother image.
Persistence
Picture Archiving and Communications System
PACS
A minute area of illumination on a display screen; one of many from which an image is composed.
Pixel
After the scan converter memory.
Post-Processing
Image processing done before echo data is stored in image memory.
Preprocessing.
