Edelman Understanding Ultrasound Physics Exam Review | Questions and Correct Answers

Edelman Understanding Ultrasound Physics Exam Review | Questions and Correct Answers

As a pulse passes through soft tissue, a certain amount of acoustic energy remains in the tissue as heat.
What is this constituent of attenuation called?
a. Scattering
b. Absorption
c. Refraction
d. Rarefaction
Absorption
What is the amount of attenuation per centimeter that a sound wave undergoes called?
a. Beam uniformity coefficient
b. Attenuation coefficient
c. Attenuation
d. Duty factor
Attenuation coefficient
A sound beam travels 9 cm in soft tissue. The attenuation coefficient is 3 dB/cm. What is the total
attenuation that the sound beam experienced?
a. 9 dB
b. 3 dB
c. 27 dB
d. 18 dB
27 dB
The attenuation of an acoustic wave traveling through bone is _______ its attenuation through soft
tissue.
a. Greater than
b. Less than
c. Equal to
Greater than
Ultrasound waves traveling through lung tissue attenuate to a ________ extent than when traveling
through soft tissue.
a. Greater
b. Lesser
c. Nearly equal
Greater
Sound traveling through blood attenuates to a ____ extent than when traveling through soft tissue.
a. Greater
b. Lesser
c. Relatively equal
Lesser
Which of these lists indicates media with increasing attenuation of ultrasound?
a. Water, lung, soft tissue, bone, air
b. Lung, wair, soft tissue, bone
c. Lung, fat, muscle
d. Water, blood, fat, muscle, bone, air
Water, blood, fat, muscle, bone, air
True or false? Attenuation and propagation speed are unrelated.
True
Acoustic impedance is a property of ______ and has units of ___________.
a. Source and medium, lumps
b. Medium, dB
c. Medium, Rayls
d. Medium, Ohms
Medium, Rayls
To calculate the acoustic impedance of a medium, one should ________ the __________ by the
__________.
a. Divide, propagation speed, density
b. Multiple, density, propagation speed
c. Divide, density, propagation speed
d. Multiply, stiffness, density
Multiply, density, propagation speed
Which two attributes help establish the acoustic impedance of a medium?
a. Density and temperature
b. Density and stiffness
c. Stiffness and elastance
d. Elasticity and compressibility
Density and stiffness
Which value is closest to the impedance of soft tissue?
a. 1.5 kiloRayls
b. 2.5 deciRayls
c. 19 megaRayls
d. 2,000,000 Rayls
2,000,000 Rayls
Which of the following describes an angle with a measure of 45 degrees?
a. Orthogonal
b. Acute
c. Obtuse
d. Normal
Acute
Which of the following describes an angle with a measure of 123 degrees?
a. Orthogonal
b. Acute
c. Obtuse
d. Normal
Obtuse
The angle between the direction of propagation and the boundary between two media is 90 degrees.
What term describes the form of incidence of the wave?
a. Not normal
b. Direct
c. Oblique
d. Orthogonal
Orthogonal
Which term below does not belong in the group below?
a. Orthogonal
b. At right angles
c. Oblique
d. 90 degrees
e. Normal
f. Perpendicular
Oblique
A sound wave strikes a boundary between two media at a 60 degree angle. This is called _________
incidence.
a. Orthogonal
b. Angular
c. Obtuse
d. Oblique
Oblique 

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