Acoustic Physics, health and medicine homework help

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Explanation & Answer

Ok, here it is. Be careful because there were some questions that were numbered out of order, and some questions that were duplicated/repeated. Please let me know if there are any questions.

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EC1
EC2
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A - increase the acoustic power
C - temporal resolution
D - imaging depth
C - wedges
E-A&B
A-0
D - All of the above
B - phased array
A - Fresnel Zone
B - the shift is between 20Hz and 20kHz
B - negative
B - the difference between emitted and received frequency
A - 1/2 PRF
A - laminar flow
D - zero baseline technique
A - FFT
A - more in the far field
A - smaller diameter crystal
D - elevational resolution
B - Lateral resolution
C - temporal resolution
B - Hz
A - SPL/2
B - distance
TRUE
TRUE
TRUE
TRUE
TRUE
f=(v+vr)/(v+vs)fo where f is the observed frequency, v = the velocity of sound, vr is the velocity of the receiver, vs
The repeating of an original wave pattern at a different frequency. 100hz wave has harmonics at 200hz, 300hz, et
B - retrograde flow
Positive doppler shift
A - left side
Variance
D - no doppler shift
B - closest to the black line
D - slice thickness
C
E
B
A
D
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F

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J
D - right side of color scale
C - reverberation
A - 220
C - nondirecitonal doppler uses non coherent processing while bidoreciton uses phase quadrature processing
B - 100
B - large pixels with many bits/pixel
B - oblique incidence and different speeds
A - two reflectors positioned one in front of the other appears as on reflection
E - zero
A - exposure response
E - display depth
A - increased frequency
E - 30kHz
E - side lobe
D - high frequency large diameter
E - 5kHz
A - depth of view
C - colorflow is pulsed ultrasound technique that is subject to aliasing artifact
D - nonlinear behavior
B - two waves with identical frequencies must interfere constructively
E - decrease spatial pulse length
B - The number of pixels per inch
C - compensation
C - compensation
C - 1.25 kHz
E - tendon
C - decreased pulse duration
B - calibrated absorpterometer
B - stable cavitation
E - density of the meadium and stiffness of the medium
B - Attenuation properties are too low
D - harmful bioeffects are commonly observed
B - z axis
A - increased receiver gain
E - A to D conversion
E - focus
NO #34
NO #35
B - propogation speed of sound in the medium and imaging depth
D - time
A - poor temporal resolution and flash artifact
D - kilo, hecto, deci, milli, micro, nano
No #40
D - increase the transducer frequency
D - low frequency, small diameter
E - decrease output power

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E - Rayleigh scattering
D - turbulent flow
D - the benefits outweigh the risks
B - high sensitivity
D - beam former
A - randomized and prospective
D - depth ca...


Anonymous
Very useful material for studying!

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