Term
| The fundamental or operating frequency is.. |
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Definition
| affected by the thickness of the PZT element (thickness=1/2 wavelength) |
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Term
| How thick is the element if the frequency is 3MHz? |
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Definition
| half the wavelength of the wave in the PZT |
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Term
| The piezoelectric effect is best described as |
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Definition
| deformation from voltage sent to the crystals |
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Term
The impedance of the PZT crystals is higher than the impedance of skin tissue
(TRUE or FALSE) |
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Definition
|
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Term
Which of the following could not be used as the coupling medium (gel)?
a. saline solution
b. water
c. barium sulfate
d. aqueous gels |
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Definition
| c. barium sulfate (doesn't allow propagation of US wave) |
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Term
The gel has greater impedance than the matching layer but less than the impedance of the PZT elements.
(TRUE or FALSE) |
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Definition
|
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Term
| Highest to Lowest impedance. |
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Definition
| PZT, Matching Layer, Gel, and Skin |
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Term
The damping layer decreases the PRP at a specific imaging depth.
(TRUE or FALSE) |
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Definition
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Term
The backing material decreases the Q factor.
(TRUE or FALSE) |
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Definition
|
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Term
| If the transmitted pulse has frequencies from 3.5 MHz to 6.5 MHz, what is the bandwidth? |
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Definition
|
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Term
The backing material decreases the SPL.
(TRUE or FALSE) |
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Definition
|
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Term
| Which is NOT a result of damping layer? |
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Definition
|
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Term
| Which affects the frequency of the transmitted beam from CW ultrasound? |
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Definition
| Ultrasound System Electronics |
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Term
In PW ultrasound, the Q-factor should be made larger as possible.
(TRUE or FALSE) |
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Definition
|
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Term
| Which is most important in producing the frequency of the beam in soft tissue. |
|
Definition
| Propagation speed of the PZT elements |
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Term
If the frequency of the electrical excitation voltage of a pulsed wave transducer is 6 MHz, the main or center frequency of the transducer is 6 MHz.
(TRUE or FALSE) |
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Definition
|
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Term
The diameter of the active element of a transducer helps to determine the frequency of the US produced by the transducer.
(TRUE or FALSE) |
|
Definition
|
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Term
Two piezoelectric crystals are made from the same material. The thicker crystal will make a pulsed transducer with higher frequency.
(TRUE or FALSE) |
|
Definition
|
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Term
For a pulsed wave transducer, if the PZT crystal thickness is doubled, then the frequency of sound is halved.
(TRUE or FALSE) |
|
Definition
|
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Term
The acoustic impedance of the matching layer equals the acoustic impedance of skin.
(TRUE or FALSE) |
|
Definition
|
|
Term
A broadband transducer is more characteristic than a narrow bandwidth for imaging transducers.
(TRUE or FALSE) |
|
Definition
|
|
Term
A very high Q-factor transducer is more common than low Q-factor for diagnostic imaging.
(TRUE or FALSE) |
|
Definition
|
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Term
| With a pulsed wave transducer, what occurs if the PZT thickness is halved? (Decreased) |
|
Definition
| Frequency is doubled. (Increased) |
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Term
| With a pulsed wave transducer, what occurs if the PZT thickness is doubled? (Increased) |
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Definition
| Frequency is halved. (Decreased) |
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Term
The damping material in a transducer acts to: increase the pulse length.
(TRUE or FALSE) |
|
Definition
|
|
Term
The damping material in a transducer acts to: improve the system's longitudinal resolution.
(TRUE or FALSE) |
|
Definition
|
|
Term
The damping material in a transducer acts to: decrease the quality factor.
(TRUE or FALSE) |
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Definition
|
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Term
| What is NOT a natural element? |
|
Definition
| Lead titanate zirconate. (man-made) manufactured |
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Term
| Mechanical energy into electrical energy and vise versa is: |
|
Definition
|
|
Term
Transducers are cleaned with high temperature germicide.
(TRUE or FALSE) |
|
Definition
|
|
Term
Using a transducer with a cracked plastic covering may shock patient.
(TRUE or FALSE) |
|
Definition
|
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Term
Damping or backing material reduces the # of cycles per pulse and cuts down the ringing.
(TRUE or FALSE) |
|
Definition
|
|
Term
Damping layer creates longer pulses with good quality factor.
(TRUE or FALSE) |
|
Definition
|
|
Term
Damping material reduces sensitivity and efficiency of transducer
(TRUE or FALSE) |
|
Definition
|
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Term
The backing material decreases the duty cycle at a particular PRF.
(TRUE or FALSE) |
|
Definition
|
|
Term
The pulse duration increases because of the backing material.
(TRUE or FALSE) |
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Definition
|
|
Term
| What would cause the PZT properties to be eliminated? |
|
Definition
|
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Term
| The measurement that relates bandwidth to the operating frequency is... |
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Definition
|
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Term
| The ____ of the transducer is the ratio of the operating frequency to the bandwidth. |
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Definition
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