ARDMS SPI EXAM REVIEW 2026
COMPLETE QUESTIONS AND ANSWERS
◉ The inertia of the medium describes its:
Answer: Density.
Inertia is described by Newton's principle - an object at rest will stay
at rest. An object in motion stays in motion, unless acted on by an
outside force.
◉ Greatest attenuation would occur at:
Answer: long distance with high frequency
◉ A 3MHz sound beam travels through two media. It attenuates 5 dB
in medium A and 6 dB in medium B.
Answer: Total attentuation is 11 dB
Attenuation simply adds up as sound travels.
◉ What would you do to create a wave with the highest possible
intensity?
,Answer: Highest intensity would occur with a short distance and low
frequency.
◉ Lowest Attenuation is found at
Answer: lowest frequency, with the shortest path length.
◉ What results in the most attenuation?
Answer: most attenuation occurs at the high frequency and long
distance.
◉ Which media has the greatest attenuation and the slowest speed?
Answer: Air
Air > Bone & Lung > Soft Tissue > Water
◉ What type of wave is sound?
Answer: Mechanical and Longitudinal wave
◉ The speed of sound in soft tissue:
Answer: 1540 m/s
◉ The unit for wavelength:
, Answer: Distance (mm)
◉ Enhancement is caused by:
Answer: weakly attenuating structures
◉ Lowest attenuating to highest attenuation
Answer: Fat-Muscle-Bone-Air
◉ List propagation speed from lowest to highest
Answer: Air-Fat-Muscle-Bone
◉ Which of these media has the lowest attenuation and the greatest
speed?
bone
tendon
lung
fat
air
Answer: Bone
Air > Bone & Lung > Soft Tissue > Water
COMPLETE QUESTIONS AND ANSWERS
◉ The inertia of the medium describes its:
Answer: Density.
Inertia is described by Newton's principle - an object at rest will stay
at rest. An object in motion stays in motion, unless acted on by an
outside force.
◉ Greatest attenuation would occur at:
Answer: long distance with high frequency
◉ A 3MHz sound beam travels through two media. It attenuates 5 dB
in medium A and 6 dB in medium B.
Answer: Total attentuation is 11 dB
Attenuation simply adds up as sound travels.
◉ What would you do to create a wave with the highest possible
intensity?
,Answer: Highest intensity would occur with a short distance and low
frequency.
◉ Lowest Attenuation is found at
Answer: lowest frequency, with the shortest path length.
◉ What results in the most attenuation?
Answer: most attenuation occurs at the high frequency and long
distance.
◉ Which media has the greatest attenuation and the slowest speed?
Answer: Air
Air > Bone & Lung > Soft Tissue > Water
◉ What type of wave is sound?
Answer: Mechanical and Longitudinal wave
◉ The speed of sound in soft tissue:
Answer: 1540 m/s
◉ The unit for wavelength:
, Answer: Distance (mm)
◉ Enhancement is caused by:
Answer: weakly attenuating structures
◉ Lowest attenuating to highest attenuation
Answer: Fat-Muscle-Bone-Air
◉ List propagation speed from lowest to highest
Answer: Air-Fat-Muscle-Bone
◉ Which of these media has the lowest attenuation and the greatest
speed?
bone
tendon
lung
fat
air
Answer: Bone
Air > Bone & Lung > Soft Tissue > Water
