Physics > QUESTIONS & ANSWERS > Ultrasound Physics Review|SPI Review\ALL Chapters, Formulas & Relationships|UPDATED 2022 (All)

Ultrasound Physics Review|SPI Review\ALL Chapters, Formulas & Relationships|UPDATED 2022

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The fundamental or operating frequency Correct Answer: is affected by the thickness of the PZT element (thickness = ½ wavelength) Which of the following could not be used as the coupling medium (ge... l)? Correct Answer: barium sulfate The piezo electric effect is best described as Correct Answer: deformation from voltage sent to the crystals How thick is the element if the frequency is 3MHz? Correct Answer: half the wavelength of the wave in the PZT The gel has greater impedance that the matching layer but less than the impedance of the PZT elements' T/F Correct Answer: False The impedance of the PZT crystals is higher than the impedance of skin tissue. T/F Correct Answer: True Place the following in order of highest to lowest impedance. Correct Answer: PZT > matching layer > gel > skin The damping layer decreases the PRP at a specific imaging depth. T/F Correct Answer: False The backing material decreases the duty cycle at a particular PRF. T/F Correct Answer: True The pulse duration increases because of the backing material. T/F Correct Answer: False The backing material decreases the Q factor. T/F Correct Answer: True The backing material decreases the SPL. T/F Correct Answer: True If the transmitted pulse has frequencies from 3.5 MHz to 6.5 MHz, what is the bandwidth? Correct Answer: 3.0 MHz Which of the following is not a result of the damping layer? Correct Answer: sensitivity increases Which of the following would cause the PZT properties to be eliminated? Correct Answer: high temperatures Which of the following affect the frequency of the transmitted beam from CW ultrasound? Correct Answer: ultrasound system electronics (CW is determined by the electrical signal from the pulser) Which of the following are most important in producing the frequency of the beam in soft tissue Correct Answer: propagation speed of the PZT elements [Show More]

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