Which of the following transducers will produce the highest frequency sound waves?
A. 6mm element thickness, 2mm/μs propagation speed of the element
B.
... [Show More] 2mm element thickness, 6mm/μs propagation speed of the element
C. 6mm element thickness, 6mm/μs propagation speed of the element
D. 2mm element thickness, 2mm/μs propagation speed of the element
2mm element thickness, 6mm/μs propagation speed of the element
The narrowest portion of a beam produced by a focused ultrasound transducer is:
A. the focal point
B. the Fresnel zone
C. the Fraunhofer zone
D. the first centimeter of the beam that leaves the transducer
the focal point
If a Doppler system is operating at a PRF of 5000/s what is the maximum Doppler frequency that can be detected?
A. 2500kHz
B. 500kHz
C. 2.5kHz
D. 5kHz
2.5kHz
Why does Doppler tracing not touch the baseline on either side?
A. high filter settings
B. decreased Doppler gain settings
C. spectral broadening
D. decreased rejection settings
high filter settings
Which of the following statements correctly describes annular arrays?
A. an annular array can electronically focus the beam
B. an annular array can use phasing to electronically steer the beam
C. annular arrays provide the lowest slice thickness resolution
D. annular arrays usually contain 30 or more circular elements
an annular array can electronically focus the beam
Which of the following describes the primary advantage of a 1.5D array over a 1D array?
A. the 1.5D array eliminates the need for a stand-off pad for superficial imaging
B. the 1.5D array can produce a trapezoid field of view while the 1D array can only produce a rectangular field of view
C. the 1.5D array allows for 3D imaging while the 1D array does not
D. the 1.5D array allows for variable elevation focus while the 1D array has a fixed elevation focus
the 1.5D array allows for variable elevation focus while the 1D array has a fixed elevation focus
What wave parameter is defined as the wavelength times the number of cycles in the pulse?
A. period
B. spatial pulse length
C. pulse repetition frequency
D. pulse duration
spatial pulse length
You are scanning a thyroid gland with a 5cm wide linear array transducer. You are unable to document the upper and lower poles in the same image to obtain a length measurement of the gland. Which of the following techniques would assist in documenting the entire thyroid gland on a single image?
A. spatial compounding
B. electronic focusing
C. 3D volume rendering
D. panoramic imaging
panoramic imaging
The average speed of sound in soft tissue is:
A. 1580m/s
B. 3300m/s
C. 1540m/s
D. 1540cm/s
1540m/s
Which of the following is NOT the proper procedure for disinfection of instruments between patients?
A. saniwipes or Cidex can be used to disinfect the transducer after each ultrasound exam
B. sonographers should wash their hands after each exam, even if gloves were used
C. all biopsy needles should be sent out for sterilization after each use
D. gel bottles should be sanitized daily using disinfectant cleanser
all biopsy needles should be sent out for sterilization after each use
Which of the following correctly describes the color displayed on the image?
A. the color scale should be reduced so that the entire vessel is filled with blue color
B. the color scale should be reduced so that the entire vessel is filled with red color
C. the red and blue colors indicate that flow is moving in two different directions simultaneously in the vessel
D. the heel-to-toe method can be used to change the course of the vessel across the image and this will allow the vessel to accurately display a single color
the heel-to-toe method can be used to change the course of the vessel across the image and this will allow the vessel to accurately display a single color
What effect will increased hematocrit levels have on an arterial duplex exam?
A. hematocrit levels do not affect a Doppler evaluation
B. decreased blood viscosity
C. increased color flow display
D. decreased blood flow velocities
decreased blood flow velocities
When using a tissue phantom to evaluate range accuracy, what unit will be used to report the measurement?
A. centimeter
B. micrometer
C. decibel
D. millisecond
centimeter
Increasing the angle of electronic steering causes _______ production of lobe artifact
A. increased
B. decreased
C. no change
D. limited
increased
The main advantage of a curvilinear transducer over a vector transducer is:
A. the ability to perform CW Doppler with 2D imaging
B. the smaller footprint
C. the wider near field
D. the ability to scan at increased frame rates
the wider near field
There is no known adverse biological effect in vivo using an unfocused ultrasound transducer at intensities below ______
A. 1000mW/cm^2 SATA
B. 1000mW/cm^2 SPTA
C. 100W/cm^2 SPTA
D. 100mW/cm^2 SPTA
100mW/cm^2 SPTA
Which of the following is true regarding continuous wave transducer structure and function?
A. CW probes have a single PE element
B. CW probes are preferred for detection of low velocity flow
C. CW probes do not require a matching layer
D. CW probes usually have no backing material
CW probes usually have no backing material
How can you adjust the elevation focus to a more superficial location in a 1D array transducer?
A. there is no way to adjust the elevation focus in a 1D array
B. change the short axis focus setting on the console
C. scan the breast from a lateral approach
D. use a stand off pad
use a stand off pad
What is the proper method used to assess the size of the dead zone?
A. trace the area of the portion of the image that demonstrates reverberation at the top of the screen
B. trace the volume of the portion of the image that demonstrates reverberation at the top of the screen
C. measure the width of the area of reverberation at the top of the screen
D. measure from the top of the image to the depth that uniform tissue is identified
measure from the top of the image to the depth that uniform tissue is identified
As beam width increases, how is intensity affected?
A. decreases
B. increases
C. no change except in endocavity probes intensity decreases
D. no change except in endocavity probes intensity increases
decreases
Spatial resolution is:
A. another term for slice thickness resolution
B. the weakest reflected signal the transducer can receive
C. highest with linear phased arrays
D. the minimum reflector separation required to produce separate echoes
the minimum reflector separation required to produce separate echoes [Show Less]