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Davies SPI Review Questions With 100% Verified Solutions 2024
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Davies SPI Review Questions With 100% Verified Solutions 2024
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Davies SPI Review Questions With 100%Verified Solutions 2024
artifact based on the interface patterns of scattered echoes CORRECT ANSWERS acoustic speckle
impedance increases with what two things? CORRECT ANSWERS increased tissue density & increased propagation speed
main advantage of using an intracavitary (transvag) probe? CORRECT ANSWERS probe is closer to the area of interest, so a higher frequency can be used, resulting in superior spatial reso
varying the excitation voltage to each element in the group used to form the ultrasound pulse is called? CORRECT ANSWERS apodization
a digital scan converter is another name for what system component? CORRECT ANSWERS image memory
propagation speed is lowest in what biological tissue? CORRECT ANSWERS fat
list the order of biological tissue sound travels through by lowest to highest propagation speed: CORRECT ANSWERS fat (lowest)
liver
blood
muscle
bone (highest)
a rounded mass with irregular borders has a much slower prop speed than surrounding tissue. what sound-tissue interaction will be encountered as the US propagates through this interface?
a. refraction
b. reflection
c. absorption d. scattering
e. all of the above CORRECT ANSWERS e. all of the above
a. refraction bc of the oblique incidence (round surface)
b. reflection bc the acoustic impedance is different (diff densities) c. absorption bc that occurs as sound travels through tissue d. scattering bc of the irregular margins bending of the sound beam is termed? CORRECT ANSWERS refraction
refraction results in a ________ of the reflectors ________ CORRECT ANSWERS misplacement, laterally
unit for intensity = CORRECT ANSWERS decibels
T/F intensity is a specific meassurement CORRECT ANSWERS false. intensity is a relative measurement based on a logarithmic scale
the point of maximum intensity within a sound beam is located at the? CORRECT ANSWERS focal point
at the focal point, the beam width is the ________, resulting in more of the neergy being
confined to a smaller area. Sound energy is therefore more _____ at the focal point compared to other points in the US beam. CORRECT ANSWERS narrowest,
intense
when increasing the number of transmit focal zones to improve spatial reso, the trade-
off is: CORRECT ANSWERS lateral reso vs temporal reso each transmit focus requires a pulse/listen cycle. as more focal zones are added, the frame rate is decreased. temporal reso is related to frame rate
the speed of sound is defined as the speed at which the: CORRECT ANSWERS sound wave propagates through the medium
the ability to distinguish similar structures with varying grey scale is termed: CORRECT ANSWERS contrast reso
resolution of two structures at different depths along the path of the sound beam is termed: CORRECT ANSWERS axial reso
you have increased the output power by 10dB. this effects the signal intensity how? CORRECT ANSWERS increases by a factor of 10.
increasing a control by 3dB corresponds to a ______ of the setting. if it is increased by 10dB, it has been increased by a factor of ____. CORRECT ANSWERS doubling 10
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