Physics Three
ULTRASOUND THREE
- 1.
What is the average velocity of ultrasound in soft tissue at 5 MHz?
- A.
1540 meter per millisecond
- B.
1540 meters per microsecond
- C.
1540 meters per nanosecond
- D.
1540 meters per second, 1.54 mm/us or 154,000 cm/sec or1.54 km/s
Correct Answer
D. 1540 meters per second, 1.54 mm/us or 154,000 cm/sec or1.54 km/s -
- 2.
Red blodd cells are an example of a
- A.
Are smaller than the beams wavelength
- B.
Rayleigh scattering redirects beam in all directions
- C.
Strong reflector
- D.
Mirror reflector
Correct Answer(s)
A. Are smaller than the beams wavelength
B. Rayleigh scattering redirects beam in all directions -
- 3.
The spatial pulse length
- A.
Determines penetration depth
- B.
Usually decreases with freqency
- C.
Is improved with rectification
- D.
Determines lateral resolution
Correct Answer
B. Usually decreases with freqency -
- 4.
Axial resolution
- A.
Is improved with the focal zone
- B.
Depends on the TCG slope
- C.
Is improved with digital scan converters
- D.
Depends on the wavelength
Correct Answer
D. Depends on the wavelength -
- 5.
If the amplitude is doubled the intensity is
- A.
Doubled
- B.
Halved
- C.
Increased 4 times
- D.
Unchanged
Correct Answer
C. Increased 4 times -
- 6.
Increasing the PRP
- A.
Improves resolution
- B.
Increases the maximum depth that can be imaged
- C.
Decreases the maximum depth that can be imaged
Correct Answer
B. Increases the maximum depth that can be imaged -
- 7.
The change in direction of an ultrasound beam, when it pases from one medium to another, is which elasticity and density differ from those of the first medium is called
- A.
Refraction
- B.
Rarefraction
- C.
Angulation
- D.
Reflection
Correct Answer
A. Refraction -
- 8.
Specular reflection occurs when
- A.
The frequency is small compared with the wavelength
- B.
The object that causes the reflection is small
- C.
The reflector surface is smooth as compared with the wavelength
- D.
The angle of incidence and the angle of reflection differ by at least 45 degrees
Correct Answer
C. The reflector surface is smooth as compared with the wavelength -
- 9.
The transducer _____________is equal to the ratio of the operatoring frequency to the frequency bandwidth
- A.
Frequency
- B.
Q factor
- C.
Resolution
- D.
Polarity
Correct Answer
B. Q factor -
- 10.
As frequency increases the beam width will
- A.
Decrease
- B.
Increase
Correct Answer
A. Decrease -
- 11.
Which of the following will improve both axial and lateral resolution
- A.
Short pulse length
- B.
Narrow beam length
- C.
Increase beam diameter
- D.
Increase transducer frequency
Correct Answer
D. Increase transducer frequency -
- 12.
The ability to resolve structures lying perpendicular to the axis of the ultrasound beam is called
- A.
Lateral resolution
- B.
Axial resolution
- C.
Depth resolution
- D.
Longitudinal resolution
Correct Answer
A. Lateral resolution -
- 13.
The role of sound attentuation in tissue is expressed in terms of
- A.
Half value layer
- B.
Huygen's principle
- C.
Duty factor
- D.
Spatial peak
Correct Answer
A. Half value layer -
- 14.
For a specular reflector
- A.
The angle of incidence is equal to the angle of reflection
- B.
The angle of incidence is greater than the the angle of reflection
- C.
There is no dependence of beam angle
- D.
The angle of incidence is less than the angle of reflection
Correct Answer
A. The angle of incidence is equal to the angle of reflection -
- 15.
The comet tail artifact can be seen posterior to an object that has
- A.
A much lower acoustic impedance than it surroundings
- B.
A much higher acoustic impedance than it surroundings
- C.
Either a much lower or a much higher acoustic impedance than it surroundings
- D.
The same acoustic impedance as it surroundings
Correct Answer
C. Either a much lower or a much higher acoustic impedance than it surroundings -
- 16.
Bandwidth can be increased by
- A.
Increasing the quality factor
- B.
Increasing the frequency
- C.
Increasing the pulse length
- D.
Increasing damping
Correct Answer
D. Increasing damping -
- 17.
Apodization helps reduce
- A.
The pulse duration
- B.
Attenuation in tissue
- C.
Slice thickness
- D.
Alters the electrical spke voltages and reduces side lobes
Correct Answer
D. Alters the electrical spke voltages and reduces side lobes -
- 18.
Pulse duration
- A.
Is the fraction of time that the system is transmitting a pulse
- B.
Is the distance that a pulse occupies in space
- C.
Is the actual time from the start of a pulse to the end of that pulse
Correct Answer
C. Is the actual time from the start of a pulse to the end of that pulse -
- 19.
Dynamic aperture
- A.
Guards the transducer from noise
- B.
Reduces beam width changes with depth
- C.
Provides a diverging image field
- D.
Expands the focal region of single element transducers
Correct Answer
B. Reduces beam width changes with depth -
- 20.
The width of an ultrasound beam measured perpendicular to the scanning plane, determines the
- A.
Hoziontal distance measurement accuracy
- B.
Maximum depth of visualization
- C.
Lateral resolution
- D.
Slice thickenss
Correct Answer
D. Slice thickenss -
- 21.
The near field length of a 5MHz unfocused, single - element transducer will be ____________ than that of 2.5 MHz transducer of the same diameter.
- A.
Twice
- B.
Equal to
- C.
Half
- D.
1/4
Correct Answer
A. Twice -
- 22.
The number of ultrasound pulses per second emitted by an ultrasound machine is
- A.
Transmit power
- B.
Image frame rate
- C.
Pulse repetition frequency
- D.
Wave frequency
Correct Answer
D. Wave frequency -
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Jan 10, 2013Quiz Edited by
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Feb 13, 2010Quiz Created by
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