ARDMS SPI EXAM LATEST 2025-2026
UPDATE COMPREHENSIVE QUESTIONS
AND CORRECT ANSWERS
lateral resolution answer - Which AIUM test object function utilizes the B group of wires in the
AIUM 100 mm test object?
dead zone answer - Which AIUM test object function utilizes the D group of wires in the AIUM
100 mm test object?
depth calibration 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? answer - improves
How much will a 3.5 MHz pulse be attenuated after passing through 2 cm of soft tissue? answer
- 3.5 dB
Propagation speed errors result in answer - improper axial position
Enhancement is caused by answer - weakly attenuating structures
The Doppler shift frequency is 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 answer -
more than 15
,True/False: The SPTA intensity will always be larger than the SATA intensity. answer - True
The intensity of the ultrasound beam is usually greater at the focal zone because of answer -
the smaller beam diameter
If the amplitude is doubled, the intensity is answer - quadrupled
The attenuation for soft tissue is answer - increased with tissue thickness
The acoustic impedance of the matching layer 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.
answer - False
True/False: The beam diameter is constant in the near zone. answer - False
The operating frequency is dependent on answer - thickness of the crystal
The period of an ultrasound wave is answer - the time of one wavelength
The dynamic range of a system is 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.
answer - True
,Increasing the pulse repetition period answer - increases the maximum depth that can be
imaged
Ultrasound bioeffects answer - are not confirmed below 100 mW/cm² SPTA
True/False: No refraction can occur at an interface if the media impedances are equal. answer -
False
True/False: Smaller transducers always produce smaller beam diameters. answer - False
True/False: The ultrasound beam profile can be measured with a hydrophone. answer - True
True/False: The pulsed-Doppler system yields better depth resolution than the continuous wave
(CW) system. answer - True
True/False: The gray-scale display was made possible when digital scan converters replaced
analog scan converters. 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. answer - False
True/False: Linear phased array scanners need no form of mechanical focusing because focusing
is performed electronically. answer - False
True/False: The fram rate of real-time scanners depends on the number of lines used to form
the image. answer - True
True/False: It is not possible to steer an annular phased array electronically. answer - True
, True/False: The near zone length should be kept as short as possible. answer - False
What percentage of intensity of an ultrasound pulse incident on an interface of 0.25 and 0.75
rayls is reflected? answer - 25%
Axial resolution can be improved by using answer - higher frequency transducers
When particle motion of a medium is parallel to the direction of a wave propagation, the wave
being transmitted is called a answer - longitudinal wave
The wavelength in a material having a wave velocity of 1500 m/s emplying a transducer
frequency of 5 MHz is answer - 0.3 mm
The factor that determines the amount of reflection at the interface of two dissimilar materials
is answer - difference in acoustic impedances
The equation that describes the relationship among propagation, wavelength, and frequency is
answer - λ = c/ƒ
What three things can occur when an ultrasonic beam reaches the interface of two dissimilar
materials? answer - reflection, refraction, mode conversion
The acoustic impedance of a material is answer - equal to the product of density and velocity
The average velocity of ultrasonic waves in soft tissue is answer - 1540 m/s
UPDATE COMPREHENSIVE QUESTIONS
AND CORRECT ANSWERS
lateral resolution answer - Which AIUM test object function utilizes the B group of wires in the
AIUM 100 mm test object?
dead zone answer - Which AIUM test object function utilizes the D group of wires in the AIUM
100 mm test object?
depth calibration 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? answer - improves
How much will a 3.5 MHz pulse be attenuated after passing through 2 cm of soft tissue? answer
- 3.5 dB
Propagation speed errors result in answer - improper axial position
Enhancement is caused by answer - weakly attenuating structures
The Doppler shift frequency is 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 answer -
more than 15
,True/False: The SPTA intensity will always be larger than the SATA intensity. answer - True
The intensity of the ultrasound beam is usually greater at the focal zone because of answer -
the smaller beam diameter
If the amplitude is doubled, the intensity is answer - quadrupled
The attenuation for soft tissue is answer - increased with tissue thickness
The acoustic impedance of the matching layer 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.
answer - False
True/False: The beam diameter is constant in the near zone. answer - False
The operating frequency is dependent on answer - thickness of the crystal
The period of an ultrasound wave is answer - the time of one wavelength
The dynamic range of a system is 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.
answer - True
,Increasing the pulse repetition period answer - increases the maximum depth that can be
imaged
Ultrasound bioeffects answer - are not confirmed below 100 mW/cm² SPTA
True/False: No refraction can occur at an interface if the media impedances are equal. answer -
False
True/False: Smaller transducers always produce smaller beam diameters. answer - False
True/False: The ultrasound beam profile can be measured with a hydrophone. answer - True
True/False: The pulsed-Doppler system yields better depth resolution than the continuous wave
(CW) system. answer - True
True/False: The gray-scale display was made possible when digital scan converters replaced
analog scan converters. 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. answer - False
True/False: Linear phased array scanners need no form of mechanical focusing because focusing
is performed electronically. answer - False
True/False: The fram rate of real-time scanners depends on the number of lines used to form
the image. answer - True
True/False: It is not possible to steer an annular phased array electronically. answer - True
, True/False: The near zone length should be kept as short as possible. answer - False
What percentage of intensity of an ultrasound pulse incident on an interface of 0.25 and 0.75
rayls is reflected? answer - 25%
Axial resolution can be improved by using answer - higher frequency transducers
When particle motion of a medium is parallel to the direction of a wave propagation, the wave
being transmitted is called a answer - longitudinal wave
The wavelength in a material having a wave velocity of 1500 m/s emplying a transducer
frequency of 5 MHz is answer - 0.3 mm
The factor that determines the amount of reflection at the interface of two dissimilar materials
is answer - difference in acoustic impedances
The equation that describes the relationship among propagation, wavelength, and frequency is
answer - λ = c/ƒ
What three things can occur when an ultrasonic beam reaches the interface of two dissimilar
materials? answer - reflection, refraction, mode conversion
The acoustic impedance of a material is answer - equal to the product of density and velocity
The average velocity of ultrasonic waves in soft tissue is answer - 1540 m/s
