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Sonography Canada CORE (Physics) Questions And Answers 100% Score!!!!
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Sonography Canada CORE (Physics) Questions AndAnswers 100% Score!!!!
Quiz :what is a transducer? - Answer :anything that converts one form of
energy to another form of energy
Quiz :what does an ultrasound transducer do? - Answer :converts
electropotential energy into mechanical and mechanical energy into
electropotential energy
Quiz :what is the curie point? - Answer :if a crystal is heated beyond the curie
point (360 degrees for PZT) the crystal can lose piezoelectric effects
Quiz :what material is traditionally used for ultrasound trasnducers? -
Answer :Lead ziconate titanate (PZT)
Quiz :what are modern transducers made out of? - Answer :composite
materials to achieve greater conversion efficiency with less of an acoustic
impedance mismatch
Quiz :Near zone (fresnel) - Answer :the area between the face of the
transducer and the beam focus
Quiz :Far zone (Fraunhofer) - Answer :Region past the focus
Quiz :Focus - Answer :Where the beam reaches its minimum diameter
Quiz :Focal region - Answer :Region over whch the beam is most tightly
focused
Quiz :Detail resolution - Answer :Ability to distinguish between two objects in
any of the three dimensions (Axial,lateral, elevational)
Quiz :Operating frequency - Answer :Center frequency of the transmit
bandwidth
Quiz :what are four methods of focusing the ultrasound beam -
Answer :1)Lenses
2)curved elements
3)electronic focusing
, 4)mirrors
Quiz :define lateral resolution. What are other names for lateral resolution? -
Answer :The ability to resolve two structures as well as the limit to
measurement accuracy in the lateral dimension of an image
Side by side, angular, transverse, azimuthal
Quiz :Lateral resolution is equal to.... - Answer :Lateral bandwidth
Quiz :define elevation resolution. What are other names - Answer :ability to
resolve two structures as well as the limit to measurement accuracy in the
elevation dimension
Quiz :what are the four acoustic variables? - Answer :Pressure
density
temperature
particle motion
Quiz :If a wave needs a medium to propagate it is a(n) __________ wave? -
Answer :mechanical
Quiz :what is the wavelength equation - Answer :wavelength=propagation
velocity/frequency
Quiz :What is amplitude? - Answer :measure of the strength or size of a
physical quantity. Voltage is a measure of electrical amplitude
Quiz :Constructive Interference (In phase waves) - Answer :Adding two signals
that are in phase
Occurs when two waves interact to produce a larger single wave
Quiz :Destructive Interference (out of phase waves) - Answer :when two
waves are aligned such that the peak of one wave aligns with the minimum of
the other wave, the waves have a phase difference of 180 and are completely
out of phase
Cancel each other other.
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