Frequency
Frequency 2
PRF
Definitions
High & Low Transducers
100
T or F: Frequency is expressed in microseconds
F: Frequency units include: hertz (Hz), kiloHertz (kHz), and megahertz (MHz)
100
What is the relationship of frequency and period?
Frequency and period are directly related
100
What does PRF stand for?
Pulse Repetition Frequency
100
Anatomic imaging with ultrasound is accomplished with
Pulse-echo technique
100
T or F: The frequency of transducers affect the quality of the image
true
200
Define frequency (unqualified)
Frequency is the number of cycles occurring per second for a continuous wave
200
Frequency of infrasound?
Less than 20Hz
200
What is the relationship between PRF and PRP?
They are reciprocals
200
The clinical cross-sectional gray-scale sonographic images produced are sometimes called
B scans/ Gray scale/ B mode
200
High frequency transducers produce long or short wavelengths?
High frequency transducers produce short wavelengths
300
In a nonmoving structure, does echo frequency stay the same or change?
Echo frequency stays the same
300
Period x Frequency =
1
300
Pulse Repetition Frequency definition?
The number of pulses that occur in one second
300
Echoes produced by moving objects have frequencies that are different from the pulses sent into the body; this is called the...
Doppler effect
300
High or low frequency transducers create better axial resolution?
High frequency transducers
400
What is the relationship between frequency and wavelength?
Frequency and wavelength are inversely related
400
Frequency definition as it relates to sound?
A count of how many complete variations (cycles) of pressure (or any other acoustic variable) occur in 1 second
400
What is PRF commonly expressed in?
kilohertz (kHz)
400
The up and down motion of a water surface is perpendicular to the direction of wave travel. This wave travel is called
transverse wave
400
High or low frequency transducers penetrate to deeper structures due to a lower degree of attenuation?
Low frequency transducers
500
What are the typical values of frequency?
2-15MHz
500
T or F: Frequency and PRF are dependently controlled by the sonographic instrument
F: They are independently controlled by the sonographic instrument
500
What are the typical values of PRF?
1-10kHz
500
Definition of a medium
Transition material that propagates energy waves
500
Which frequency transducer would you use (high or low) to image lumbar neuraxial structures deep in most adults?
A low frequency transducer
