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WorksheetsUntitled Quizs
Total questions: 20
Worksheet time: 10mins
Which of the following probes creates a beam with the deepest focus?
a. 4mm diameter, 4 MHz
b. 6mm diameter, 8 MHz
c. 6mm diameter, 2 MHz
d. 5mm diameter, 8 MHz
The acoustic impedance of the matching layer is ___________ the acoustic impedance of skin
less than
equal to
greater than
not comparable to
what is the frame rate of each image of the ultrasound system is created in 0.02 sec (1/50 sec)?
20 Hz
100 Hz
50 Hz
15 Hz
A pair of 9 mm diameter probes are identical except for frequencies, which are 3 mhz and 6 mhz. which sound beam will spread out more in the far field.
3 mhz
6 mhz
4 mhz
2 mhz
How thick are the Active Element and Matching Layer of a transducer?
1/2 and 1/4 of the wavelength thick respectively
1/3 and 1/5 of the wavelength thick respectively
1/4 and 1/6 of the wavelength thick respectively
1/2 and 1/3 of the wavelength thick respectively
What is the ability to accurately distinguish two structures lying close together called?
resolution
contrast
clarity
definition
which of the following locations is the deepest?
a. end of the fresnel zone
b. end of the focal zone
c. end of the fraunhofer zone
d. end of the near zone.
end of the fresnel zone
end of the focal zone
end of the fraunhofer zone
end of the near zone.
List the components of the Transducer (there's how many)?
Case, electric shield, acoustic insulator, PZT/element, wire, matching layer, backing/damping material.
Case, electric shield, acoustic insulator, PZT/element, wire, matching layer.
Case, electric shield, PZT/element, wire, matching layer, backing/damping material.
Case, electric shield, acoustic insulator, wire, matching layer, backing/damping material.
Which of the following transducers best describe as mechanically steered and fixed, single focused?
a. annular phased array
b. annular array
c. mechanical
d. linear phased
What are off-axis sound beams?
Side lobes/Grating lobes
Direct sound waves
Reflected sound waves
Echoes
In a linear phased array, what is the firing pattern that steers a beam to the left or right?
Electronic slope
Beam divergence
Phase shift
Frequency modulation
Which of the probe creates a beam with the most divergence?
large diameter, high freq probes
small diameter, low freq probes
medium diameter, medium freq probes
large diameter, low freq probes
with b-mode, which axis is related to the strength of the reflection?
x-axis
y-axis
z-axis
w-axis
Two different transducers create sound pulses. One transducer is labeled 5 mhz and the other, 3 mhz. which transducer is more likely to create a more accurate image with respect to axial resolution? Which transducer probably has a lower numerical value of axial resolution?
5 mhz transducer
3 mhz transducer
Both transducers have the same axial resolution
Neither transducer can create an accurate image
What are the parameters of sound waves? What about the parameters of pulsed wave ultrasound?
Period, Frequency, Amplitude, Power, Intensity, Wavelength, Speed; PD, PRP, PRF, DF, SPL
Volume, Pitch, Tone, Timbre; Frequency, Amplitude, Wavelength, Speed
Frequency, Amplitude, Speed, Echo; Pulse Duration, Pulse Repetition Period, Pulse Repetition Frequency, Duty Factor
Amplitude, Frequency, Speed, Intensity; Pulse Duration, Pulse Repetition Period, Pulse Repetition Frequency, Duty Factor
Name the 3 synonyms for later resolution
lateral, angular, transverse
lateral, vertical, horizontal
lateral, angular, radial
lateral, angular, azimuthal
which of the following is consistent with improved temporal resolution
a. color doppler
b. more gray shades
c. more detail
d. higher frame rate
a. color doppler
b. more gray shades
c. more detail
d. higher frame rate
what is the time needed to make a single image if the frame rate of an ultrasound system is 20 Hz
1 s
0.02 s
0.05 s
15 Hz
Which type of transducer has more backing material? therapeutic or imaging?
Therapeutic
Imaging
Continuous Wave
Piezoelectric
A sonographer, using phased array ultrasound system, turns off the multi-focus feature. What is the most likely consequence of this action?
a. frame rate decreases
b. temporal resolution degrades
c. imaging depth increases
d. temporal resolution improves
