Principles of 2D and M-mode Echocardiography practice quiz Flashcards
What are the two primary interactions responsible for ultrasound image production?
Reflection
Defraction
Scattering
Refraction
Absorption
Reflection
Scattering
According to Snell’s Law which of the following are true?
When C1<C2>θt</C2>
When C1>C2 then θi>θt
When C1>C2 then θi<θt
When C1<C2 then Θi<θt
When C1>C2 then θi>θt
When C1<C2 then Θi<θt
Acoustic impedance difference is caused by a change in which variables?
Reflecting surface
Propagation speed
Angle of incidence
Tissue density
Tissue density
Propagation speed
Calculate the total attenuation for a 1 MHz beam traversing 5 cm of liver (given the attenuation of liver is 0.5 dB/cm at 1 MHz).
6 dB
12dB
5 dB
2.5 dB
2.5dB
What occurs to the sound beam when it encounters two mediums with the same impedances at a 90 degree angle?
Transmission
Refraction
Scattering
Reflection
Transmission
Which of the following interactions of ultrasound with tissue redirects the energy of the sound beam?
Reflection
Scattering
Refraction
Diffraction
All of them:
Reflection
Scattering
Refraction
Diffraction
Which of the following causes attenuation?
Scattering
Intensity
Refraction
Diffraction
Reflection
Absorption
All except intensity
Scattering
Refraction
Diffraction
Reflection
Absorption
Attenuation of the sound beam is:
decrease in amplitude and decrease in intensity
increased in amplitude and increase in intensity
increased in amplitude and decrease in intensity
decrease in amplitude and increased in intensity
decrease in amplitude and decrease in intensity
Which two types of tissue have the biggest impedance difference?
Fat and liver
Air and skull bone
Water and liver
Fat and water
Air and skull bone
What three factors determine how much acoustic energy is lost in a medium due to absorption?
Relaxation time of the medium
Frequency of sound
Viscosity
Density
Relaxation time of the medium
Frequency of sound
Viscosity
