SPI Review 1| 580 QUESTIONS WITH COMPLETE SOLUTIONS
Example of nonspecular reflector Correct Answer: red blood cells
What happens to spatial pulse length when frequency increases? Correct
Answer: decreases
Axial resolution is dependent on? Correct Answer: wavelength
Lateral resolution is dependent on? Correct Answer: beam diameter
Where does the beam of an unfocused transducer diverge? Correct
Answer: Fraunhofer zone
Reverberation artifacts are a result of Correct Answer: two or more
strong reflecting surfaces
True/False: Grating lobes are essential for the proper operation of a
linear phased array. Correct Answer: False
True/False: Electronically steered scanners always produce higher
resolution images than do mechanically steered scanners. Correct
Answer: False
True/False: An annular array scanner uses mechanical beam steering.
Correct Answer: True
True/False: A linear sequenced array cannot be dynamically focused.
Correct Answer: False
registration or B-mode alignment Correct Answer: Which AIUM test
object function utilizes all the groups of wires in the AIUM 100 mm test
object?
,axial resolution Correct Answer: Which AIUM test object function
utilizes the A group of wires in the AIUM 100 mm test object?
lateral resolution Correct Answer: Which AIUM test object function
utilizes the B group of wires in the AIUM 100 mm test object?
dead zone Correct Answer: Which AIUM test object function utilizes
the D group of wires in the AIUM 100 mm test object?
depth calibration Correct Answer: Which AIUM test object function
utilizes the C or E groups of wires in the AIUM 100 mm test object?
What happens to axial resolution when spatial pulse length is decreased?
Correct Answer: improves
How much will a 3.5 MHz pulse be attenuated after passing through 2
cm of soft tissue? Correct Answer: 3.5 dB
Propagation speed errors result in Correct Answer: improper axial
position
Enhancement is caused by Correct Answer: weakly attenuating
structures
The Doppler shift frequency is Correct Answer: directly proportional to
the velocity of the reflector
The number of frames per second necessary for a real-time image to be
flicker free is Correct Answer: more than 15
True/False: The SPTA intensity will always be larger than the SATA
intensity. Correct Answer: True
The intensity of the ultrasound beam is usually greater at the focal zone
because of Correct Answer: the smaller beam diameter
,If the amplitude is doubled, the intensity is Correct Answer: quadrupled
The attenuation for soft tissue is Correct Answer: increased with tissue
thickness
The acoustic impedance of the matching layer Correct Answer: can be
chosen to improve transmission into the body
True/False: In a pulse-echo system, the quality factor should be made as
large as possible. Correct Answer: False
True/False: The beam diameter is constant in the near zone. Correct
Answer: False
The operating frequency is dependent on Correct Answer: thickness of
the crystal
The period of an ultrasound wave is Correct Answer: the time of one
wavelength
The dynamic range of a system is Correct Answer: the ratio of smallest
to largest power level that the system can handle
True/False: The intensity of an ultrasonic beam can be measured with
radiation force balance. Correct Answer: True
Increasing the pulse repetition period Correct Answer: increases the
maximum depth that can be imaged
Ultrasound bioeffects Correct Answer: are not confirmed below 100
mW/cm² SPTA
True/False: No refraction can occur at an interface if the media
impedances are equal. Correct Answer: False
, True/False: Smaller transducers always produce smaller beam diameters.
Correct Answer: False
True/False: The ultrasound beam profile can be measured with a
hydrophone. Correct Answer: True
True/False: The pulsed-Doppler system yields better depth resolution
than the continuous wave (CW) system. Correct Answer: True
True/False: The gray-scale display was made possible when digital scan
converters replaced analog scan converters. Correct Answer: False
True/False: Videotape recorders operating at 30 frames per second
cannot be used with mechanical real-time units because the fram rate is
too slow. Correct Answer: False
True/False: Linear phased array scanners need no form of mechanical
focusing because focusing is performed electronically. Correct Answer:
False
True/False: The fram rate of real-time scanners depends on the number
of lines used to form the image. Correct Answer: True
True/False: It is not possible to steer an annular phased array
electronically. Correct Answer: True
True/False: The near zone length should be kept as short as possible.
Correct Answer: False
What percentage of intensity of an ultrasound pulse incident on an
interface of 0.25 and 0.75 rayls is reflected? Correct Answer: 25%
Axial resolution can be improved by using Correct Answer: higher
frequency transducers
Example of nonspecular reflector Correct Answer: red blood cells
What happens to spatial pulse length when frequency increases? Correct
Answer: decreases
Axial resolution is dependent on? Correct Answer: wavelength
Lateral resolution is dependent on? Correct Answer: beam diameter
Where does the beam of an unfocused transducer diverge? Correct
Answer: Fraunhofer zone
Reverberation artifacts are a result of Correct Answer: two or more
strong reflecting surfaces
True/False: Grating lobes are essential for the proper operation of a
linear phased array. Correct Answer: False
True/False: Electronically steered scanners always produce higher
resolution images than do mechanically steered scanners. Correct
Answer: False
True/False: An annular array scanner uses mechanical beam steering.
Correct Answer: True
True/False: A linear sequenced array cannot be dynamically focused.
Correct Answer: False
registration or B-mode alignment Correct Answer: Which AIUM test
object function utilizes all the groups of wires in the AIUM 100 mm test
object?
,axial resolution Correct Answer: Which AIUM test object function
utilizes the A group of wires in the AIUM 100 mm test object?
lateral resolution Correct Answer: Which AIUM test object function
utilizes the B group of wires in the AIUM 100 mm test object?
dead zone Correct Answer: Which AIUM test object function utilizes
the D group of wires in the AIUM 100 mm test object?
depth calibration Correct Answer: Which AIUM test object function
utilizes the C or E groups of wires in the AIUM 100 mm test object?
What happens to axial resolution when spatial pulse length is decreased?
Correct Answer: improves
How much will a 3.5 MHz pulse be attenuated after passing through 2
cm of soft tissue? Correct Answer: 3.5 dB
Propagation speed errors result in Correct Answer: improper axial
position
Enhancement is caused by Correct Answer: weakly attenuating
structures
The Doppler shift frequency is Correct Answer: directly proportional to
the velocity of the reflector
The number of frames per second necessary for a real-time image to be
flicker free is Correct Answer: more than 15
True/False: The SPTA intensity will always be larger than the SATA
intensity. Correct Answer: True
The intensity of the ultrasound beam is usually greater at the focal zone
because of Correct Answer: the smaller beam diameter
,If the amplitude is doubled, the intensity is Correct Answer: quadrupled
The attenuation for soft tissue is Correct Answer: increased with tissue
thickness
The acoustic impedance of the matching layer Correct Answer: can be
chosen to improve transmission into the body
True/False: In a pulse-echo system, the quality factor should be made as
large as possible. Correct Answer: False
True/False: The beam diameter is constant in the near zone. Correct
Answer: False
The operating frequency is dependent on Correct Answer: thickness of
the crystal
The period of an ultrasound wave is Correct Answer: the time of one
wavelength
The dynamic range of a system is Correct Answer: the ratio of smallest
to largest power level that the system can handle
True/False: The intensity of an ultrasonic beam can be measured with
radiation force balance. Correct Answer: True
Increasing the pulse repetition period Correct Answer: increases the
maximum depth that can be imaged
Ultrasound bioeffects Correct Answer: are not confirmed below 100
mW/cm² SPTA
True/False: No refraction can occur at an interface if the media
impedances are equal. Correct Answer: False
, True/False: Smaller transducers always produce smaller beam diameters.
Correct Answer: False
True/False: The ultrasound beam profile can be measured with a
hydrophone. Correct Answer: True
True/False: The pulsed-Doppler system yields better depth resolution
than the continuous wave (CW) system. Correct Answer: True
True/False: The gray-scale display was made possible when digital scan
converters replaced analog scan converters. Correct Answer: False
True/False: Videotape recorders operating at 30 frames per second
cannot be used with mechanical real-time units because the fram rate is
too slow. Correct Answer: False
True/False: Linear phased array scanners need no form of mechanical
focusing because focusing is performed electronically. Correct Answer:
False
True/False: The fram rate of real-time scanners depends on the number
of lines used to form the image. Correct Answer: True
True/False: It is not possible to steer an annular phased array
electronically. Correct Answer: True
True/False: The near zone length should be kept as short as possible.
Correct Answer: False
What percentage of intensity of an ultrasound pulse incident on an
interface of 0.25 and 0.75 rayls is reflected? Correct Answer: 25%
Axial resolution can be improved by using Correct Answer: higher
frequency transducers
