SPI Final Questions And Answers 100% CORRECT
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
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
