SPI EXAM REVIEW QUESTIONS &
DETAILED CORRECT ANSWERS 100%
quality factor/Q factor CORRECT ANSWER - a measure of beam purity; the operating frequency
of the transducer divided by the bandwidth
the lower the Q factor, the better the image quality
quality factor/Q factor: unit, equation? CORRECT ANSWER - a unitless number inversely related
to bandwidth
main freq/bandwidth
Bandwidth CORRECT ANSWER - with backing material wide bandwidth is created
PW
eg main frequency is 3MHz, bandwidth range is 1-5MHz, bandwidth = 4
the lower the Qfactor, the ------ the image.
the transducer ------- backing material
the transducer is -------- wave CORRECT ANSWER - better, has, PW
the higher the Q factor, the _________the image
the transducer-----------backing material
the transducer is --------wave CORRECT ANSWER - worse, does not, CW
The matching layer is ______ wavelength thick. CORRECT ANSWER - 1/4
, Active PZT element is --------- wavelength CORRECT ANSWER - 1/2
Consequences of backing layer CORRECT ANSWER - sound pulse is short:length+duration:
better axial res
Decreased sensitivity:trans.is less able to convert low level sound to electrical signals
wide bandwidth: low Q factor : better image
Imaging: pulses with ---- duration +length
Non-imaging: pulses with---duration +length CORRECT ANSWER - short, long
Imaging: backing does?
Non-imaging: backing does? CORRECT ANSWER - limits ringing, NA
Imaging trans: ------sensitivity
Non-imaging: ------sensitivity CORRECT ANSWER - reduced, increased
Imaging trans: ----- bandwidth
Non-imaging: ------ bandwidth CORRECT ANSWER - wider, narrower
Imaging trans: --- Qfactor
Non-imaging: --- Qfactor CORRECT ANSWER - low, hi
Imaging trans: ---- axial resolution
Non-imaging: ----axial resolution CORRECT ANSWER - improved, cannot create image
CW what is the relationship electrical freq to acoustic freq? CORRECT ANSWER - equal
DETAILED CORRECT ANSWERS 100%
quality factor/Q factor CORRECT ANSWER - a measure of beam purity; the operating frequency
of the transducer divided by the bandwidth
the lower the Q factor, the better the image quality
quality factor/Q factor: unit, equation? CORRECT ANSWER - a unitless number inversely related
to bandwidth
main freq/bandwidth
Bandwidth CORRECT ANSWER - with backing material wide bandwidth is created
PW
eg main frequency is 3MHz, bandwidth range is 1-5MHz, bandwidth = 4
the lower the Qfactor, the ------ the image.
the transducer ------- backing material
the transducer is -------- wave CORRECT ANSWER - better, has, PW
the higher the Q factor, the _________the image
the transducer-----------backing material
the transducer is --------wave CORRECT ANSWER - worse, does not, CW
The matching layer is ______ wavelength thick. CORRECT ANSWER - 1/4
, Active PZT element is --------- wavelength CORRECT ANSWER - 1/2
Consequences of backing layer CORRECT ANSWER - sound pulse is short:length+duration:
better axial res
Decreased sensitivity:trans.is less able to convert low level sound to electrical signals
wide bandwidth: low Q factor : better image
Imaging: pulses with ---- duration +length
Non-imaging: pulses with---duration +length CORRECT ANSWER - short, long
Imaging: backing does?
Non-imaging: backing does? CORRECT ANSWER - limits ringing, NA
Imaging trans: ------sensitivity
Non-imaging: ------sensitivity CORRECT ANSWER - reduced, increased
Imaging trans: ----- bandwidth
Non-imaging: ------ bandwidth CORRECT ANSWER - wider, narrower
Imaging trans: --- Qfactor
Non-imaging: --- Qfactor CORRECT ANSWER - low, hi
Imaging trans: ---- axial resolution
Non-imaging: ----axial resolution CORRECT ANSWER - improved, cannot create image
CW what is the relationship electrical freq to acoustic freq? CORRECT ANSWER - equal
