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WorksheetsChapters 5-7 Review
Total questions: 25
Worksheet time: 38mins
The unit of measurement for SPTA is:
dB
W/cm2
W
Hz
With pulsed waves, which of the following is true?
SPTA is always greater than SPTP
SPTP is always greater than SPTA
SATA is always greater than SPTA
SPTA is always greater than SPPA
Temporal peak intensity is measured at:
the center of the beam
the time the pulse is at maximum value
the time cavitation occurs
none of the above
Which of the following has the lowest intensity?
SPTP
SATP
SPTA
SATA
The different measurements of intensities are most important in the study of:
Continuous wave ultrasound
Pulsed wave ultrasound
Power Doppler
Bioeffects
The percentage of an ultrasound beam reflected at an interface between gas and soft tissue is approximately
90-100%
40-50%
1-10%
<1%
The angle at which an ultrasound beam is bent as it passes though a boundary between two different materials is described mathematically by:
Huygen's principle
Curie's principle
Snell's law
Doppler's law
Specular reflections occur when
The reflecting object is small with respect to the wavelength
The reflecting surface is large and smooth with respect to the wavelength
The reflecting objects are moving
The angle of incidence and angle of reflection are unequal
Refraction will not occur at an interface...
When high frequencies are used
If the acoustic impedances are equal
If the propagation speeds are significantly different
With normal incidence of the ultrasound beam
The characteristic acoustic impedance of a material is equal to the material density and
Path length
Wavelength
Frequency
Propagation speed
When an ultrasound beam passes obliquely across the boundary between two materials, ____ will occur if there is a difference in ____ in the two materials.
Reflection, impedance
Reflection, density
Refraction, impedance
Refraction, propagation speed
Ultrasound absorption is directly proportional to
Viscosity
Frequency
Distance
Both B and C
Scattering refers to
Bending the sound beam crossing a boundary
Conversion of sound to heat
Redirection of a portion of the sound from a boundary beam
Redirection of the sound beam in several directions
Which of the following is the least likely cause for attenuation?
Absorption
Reflection
Refraction
Scattering
The attenuation coefficient in soft tissue is equal to:
One half of the operating frequency
Double the operation frequency
Frequency times path length
The total decibels
As a sound wave travels through the human body, the intensity of the sound wave decreases as a result of..
Attenuation
Absorption
Scattering
All of the above
If the angle of incidence is 60°, what is the angle of transmission at the interface if medium 1 has a propagation speed of 1320m/s and medium 2 has a propagation speed of 1900m/s?
<60
>60
60
Cannot tell the angle of transmission
The change in direction of the original sound wave that occurs when sound interacts with 2 different tissue types that have a different propagation speed is referred to as
Wavelength
Reflectors
Refraction
Absorption
The major component of attenuation is:
Scatter
Absorption
Transmission
Refraction
The range equation explains:
Side lobes
Distance to reflector
Attenuation
Intensity
A sound wave is created by a transducer, reflects off an object, and returns to the transducer. The go-return time is 39 microseconds. What is the total distance that the pulse traveled?
2 cm
3 cm
5 cm
6 cm
According to the range equation, which of the following are necessary to calculate the distance to the reflector?
Attenuation coefficient and type of reflector
Density and type of reflector
Propagation speed and pulse round-trip time
Density and pulse round-trip time
Increasing the depth will _____ the PRP.
Increase
Decrease
PRP remains the same
Increasing the depth will ______ the PRF.
Increase
Decrease
PRF remains the same
For every 13 microseconds of go-return time, the reflector is located ___ deep, and the total distance traveled will be ________.
2 cm ; doubled
1 cm ; doubled
2 cm ; quadrupled
1 cm ; quadrupled
