Chapter 14 Pulsed Echo Instrumentation Flashcards
What are the 2 major functions of ultrasound systems?
preparation and transmission (electrical signals to the transducer which creates a sound beam)
reception (receives electrical signals from the transducer; which processes images into clinically meaningful images and sounds)
The ___________ of electrical signals to the transducer, which creates a sound beam.
preparation and transmission
The __________ of electrical signals from the transducer, with subsequent processing into clinically meaningful images and sound.
reception
What are the six major components of ultrasound systems?
- Transducer
- Pulser and beam former
- Receiver
- Display
- Storage
- Master Synchronizer
Transforms electrical energy into acoustic energy. During reception, it converts the returning acoustic energy into electrical energy. This describes?
Transducer
The component of the ultrasound system that creates and controls the electrical signals sent to the transducer that generate sound pulses.
Pulser and Beam Former
The _______ determines the amplitude, pulse repetition period, and the pulse repetition frequency.
pulser
The _______ determines the firing delay patterns for phased array systems.
beam former
The component that transforms the electrical signals from the transducer (produced by the reflected sound) into a form suitable for display.
Receiver
What component of the ultrasound system presents the processed data?
Display
What component of the ultrasound system archives the ultrasound studies?
Storage
The component of the ultrasound system that maintains and organizes the proper timing and interaction of the system’s components.
Master Synchronizer
When does the pulser function?
during transmission
When the pulser is set to a low voltage the image tends to be ________.
darker
When the pulser voltage is high, the image tends to be _______.
brighter
What are the synonyms for pulser voltage (transducer output)?
output gain acoustic power pulser power energy output transmitter output power gain (don't use this one cause its to vague)
Can the sonographer adjust transducer output?
yes
Changes in transducer output affect the brightness of ___________.
entire image
defined as a random and persistent disturbance that obscures or reduces the clarity of a signal. contaminates images with low level undesirable signals
noise
What is signal to noise ratio?
comparison of the meaningful info (signal) in an image, compared to the amount of contamination (noise)