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 (... gel)? 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 [Show More]
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