WorksheetsCORE exam review 3
Total questions: 25
Worksheet time: 39mins
Sound can be characterized as...
cyclical oscillations in certain acoustic variables
the things you hear with your ear
the total energy transferred from a source to a receiver
energy flowing through a vacuum
Which of the following describes the characteristics of a sound wave?
Mechanical, Longitudinal
Longitudinal, Non-Mechanical
Mechanical, Transverse
Transverse, Acoustic
Which of the following set of parameters are considered acoustic variables?
voltage, density, intensity
frequency, wavelength, speed
pressure, density, displacement of particles
frequency, pressure, displacement of particles
Which of the following parameters are considered characteristics of a wave?
frequency, wavelength, speed
amplitude, frequency, impedance
density, pressure, displacement of particles
intensity, power, voltage
With standard ultrasonic imaging, what happens to the period of a wave as it propagates?
Always increases
Depends on the interactions within the media
Remains the same
Always decreases
As the ultrasound wave travels through the body, its amplitude usually...
Cannot be determined
Increases
Remains the same
Decreases
In diagnostic imaging, what determines the spatial pulse length?
Neither a or b
Both a and b
a. The medium through which the pulse travels
b. The ultrasound system
Which of the following is true regarding the Q value?
A high Q transducer has a short SPL and a narrow bandwidth
For pulsed wave requirements, you need a high Q value
A low Q transducer has a long SPL and a broad bandwidth
A high Q value retains energy in the crystal producing a long PD
Which type of interaction occurs when a beam with planar wave fronts pass through a small aperture (approximately 1 wavelength)?
Diffraction
Refraction
Scattering
Diffuse Reflection
All of the following are true of the focus except...
It is before the Fraunhofer zone
It is within the near zone
It has the highest spatial peak intensity
It is at the start of the Fresnel zone
Two ultrasound systems are identical except for the PRP of the emitted pulse. Which system will have a deeper focus?
The system with the lower PRP
Their focii will be at the same depth
PRP adjustments throw focal points into a chaotic state and cannot be determined.
The system with the higher PRP
For a disc-shaped PZT crystal producing continuous sound, which design will create a beam with the deepest near field depth?
Large diameter, High frequency
Small diameter, Low frequency
Large diameter, Low frequency
Small diameter, High frequency
Which of the following forms of focusing is different than the others?
Phased
Dynamic Receive
Curved crystal
Lens
What two parameters primarily affect the depth of the natural focus?
Wavelength and operating frequency
Axial and lateral resolution
Diameter of the crystal and operating frequency
Amplitude and pulse duration
Which of the following will improve a system's temporal resolution?
Increased frequency
Increased sector angle
Increased PRF
Increased line density
Which of the following best describes the demodulation?
improving the signals attenuation loss
the formation of the signals frequency
the changing of the image grayscale
the packaging of a signal
Which of the following sonographer controlled instrumentation change is least likely to improve the contrast resolution of an image?
Output power level
Increasing PRF
Dynamic Range
Edge enhancement
Which term best describes the region of the minimum amplification on a standard TGC?
Far field
Fraunhofer
Delay
Focus
Which of the following actions will improve SNR?
Increase dynamic range
Increase TGC
Increase output power
Increase gain
What is the primary advantage of multiple focal zones along each scan line of a two dimensional image?
Improved lateral resolution
Improved axial resolution
Improved temporal resolution
Decreased temporal resolution
What is the primary advantage of multiple focal zones along each scan line of a two dimensional image?
Improved lateral resolution
Improved axial resolution
Improved temporal resolution
Decreased temporal resolution
The 'useful' artifact that one might see behind a weakly attenuating structure is:
Reflection
Refraction
Shadowing
Enhancement
Sound travels through a large quantity of muscle tissue (c = 1600m/s). The reflector beyond it will be displayed...
Too close to the transducer
Sound does not travel through muscle
In the correct location
Too far from the transducer
When visualizing a velocity error artifact with a partial obstruction, if the speed of the wave within the obstruction is greater than the speed of soft tissue, the image of the underlying structure will appear split with the obstructed part appearing...
Axially farther than expected
Laterally closer than expected
Laterally farther than expected
Axially closer than expected
Range Ambiguity artifact can be corrected by:
Increasing the PRF
Using a 1.5D transducer to reduce the elevational plane width
Apodization and subdicing
Reducing the PRF
