Welcome to the Quiz!
This quiz contains 9 questions from a mix of 1 subtopics.
Which of the following statements about ultrasound reflection is true?
reflection only occurs when the wave hits at a 90° angle
identical impedance values lead to maximum reflection
significant difference in acoustic impedance results in greater reflection
refraction is the only phenomenon that occurs at a boundary
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What are the advantages of ultrasound scanning?
real-time imaging of soft tissues
economical and portable
all of the above
safe due to lack of ionising radiation exposure
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How does the piezoelectric effect contribute to ultrasound imaging?
the generated voltage is converted into images
piezoelectric crystals produce an electric potential when compressed or stretched
piezoelectric crystals change shape upon application of voltage
all of the above
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In A-scan ultrasound, what does the horizontal sweep of the electron beam correlate with?
brightness of the display
frequency of the ultrasound waves
amplitude of the reflected pulses
time-of-flight and distance measurements within the body
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What is the term for a material that facilitates effective ultrasound transmission by displacing air and matching the impedance of tissue?
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Explain the relationship between acoustic impedance and ultrasound reflection at a boundary between two media.
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What are the main disadvantages of ultrasound scanning?
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Describe the process of A-scan ultrasound range measurement.
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An ultrasound wave travels from water (acoustic impedance = 1.5×106 kg m−2s−1) into muscle tissue (acoustic impedance = 1.7×106 kg m−2s−1). Calculate the ratio of the reflected intensity to the incident intensity.
0.0039
0.0022
0.0043
0.0047
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