Physics test 4 chap 7-10

Which component is the PZT?

• A

• D

• B

• C

Which part must be half as thick as the piezoelectric crystal?

• A

• D

• B

• C

What is the function of the part labeled D?

• it divides the transducer in two; one sends, the other receives

• it separates the transducer into front and back so the sonographer can identify the front of the probe

• it conducts sound to and from the PZT crystal

• it conducts voltages to and from the PZT crystal

• none of the above

Which part of the scanhead protects the sonographer from electrocution?

• F

• E

• C

• D

• B

Which part must have a thickness not greater than half the wavelength of the operating frequency?

• A

• E

• C

• D

• B

Short pulse durations are preferred when scanning. The component of the transducer that helps achieve this is:

• A

• E

• C

• D

• B

What process takes place when echoes return to the transducer?

• refraction

• the piezoelectric effect

• constructive & destructive interference

• the reverse piezoelectric effect

• impedance

The temperature at which the PZT element may be damaged and stop working is known as the:

• Curie point

• Huygen's point

• Marconi's point

• Snell's point

The crystal used in modern scanheads is most likely to be:

• tourmaline

• amethyst

• synthetic

• quartz

Diagnostic imaging sonographers want good images to help in diagnosis so they prefer to use transducers that have:

• a low quality factor

• a medium quality factor

• a high quality factor

• a zero quality factor