Exam Review Questions - including Wk 7-8
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55 Terms
What are the acoustic variables?
What are the parameters of all sound waves?
What are the parameters of all pulsed waves?
What are two types of interference?
If the period of two waves are the same are the frequencies the same?
If the wavelengths of two waves are the same are the frequencies always the same?
What control on the ultrasound machine can change the intensity?
What determines the frequency of a pulsed wave transducer?
What is a transducer?
Any device which converts one form of energy to another form of energy
What are the three types of attenuation?
Absorption, Reflection, and Refraction
Which form of attenuation is dominant?
Absorption
Which form of attenuation is an artifact?
Refraction
What must be true for reflection to occur?
What must be true for refraction to occur?
Oblique incidence (angle) and difference in propagation speed
What is the thickness of the matching layer?
What is the thickness of the element?
What are three ways to focus a sound beam?
What is axial resolution?
What is lateral resolution?
What is temporal resolution?
What is the relationship between power and amplitude?
What determines frequency and can it be changed?
What determines period and can it be changed?
What determines wavelength and can it be changed?
What determines propagation speed and can it be changed?
What determines PRP and can it be changed?
What determines PRF and can it be changed?
What determines SPL and can it be changed?
What determines DF and can it be changed?
What determines PD and can it be changed?
Which tissue type has the fastest propagation speed - lung, soft tissue, muscle or bone? Why?
If you decrease the density, how does the propagation speed change?
How can you improve temporal resolution?
How can you improve axial resolution?
Where in the beam is the lateral resolution the best?
Does axial resolution change with depth?
Which transducer would have better axial and lateral resolution? 5 or 10 MHz
10 MHz
What is the formula for impedance?
What is the unit for impedance?
Rayls
Does frequency affect impedance?
If you are scanning at a normal incidence and the structures have the same impedance how much will be transmitted?
What is the purpose of gel?
What is the wavelength in soft tissue of a 10 MHz transducer?
What is the wavelength in soft tissue of a 5 MHz transducer?
What is the wavelength in soft tissue of a 3 MHz transducer?
A thicker element will have a higher or lower frequency?
A transducer with more backing material will have a longer or shorter pulse?
A transducer with more backing material will have a higher or lower quality factor?
A transducer with more backing material will be more or less sensitive?
A transducer with more backing material will have a wider or more narrow bandwidth?
If 50% of the sound beam is transmitted, how much will be reflected?
If you are scanning at a 45 degree angle and the propagation speed of medium 2 is 1600 m/sec and the propagation speed of medium 1 is 300 m/s how much sound will be reflected?
How do you measure the pulse duration?
How do you measure PRP?
If you increase the depth, does the PD get shorter or longer?