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  • Ultrasound Physics Chapter 8- Transducer
  • Ultrasound Physics Chapter 8- Transducer
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Ultrasound Physics (Edelman) Chapter 8- Transducers

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What does the matching layer do? - Correct Answer - ️ ️Increases the percentage of transmitted sound into the body. The backing material causes - Correct Answer - ️️less ringing and vibration PZT is - Correct Answer - ️️20x the impedance of the skin, which is why we need gel. Decreasing order of impedance - Correct Answer - ️️PZT matching layer gel skin Characteristics of the backing material - Correct Answer - ️️- high degree of sound absorption -acoustic impedance similar To PZT -sound energy is absorbed in the backing material*Three consequences - Correct Answer - ️️-Decrease sensitivity -Wide bandwidth -Low quality factor (Q-factor)

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Ultrasound Physics (Edelman) Chapter 8-
Transducers

What does the matching layer do? - Correct Answer - ✔️✔

️Increases the percentage of transmitted sound into the body.


The backing material causes - Correct Answer - ✔️✔️less ringing

and vibration


PZT is - Correct Answer - ✔️✔️20x> the impedance of the skin,

which is why we need gel.


Decreasing order of impedance - Correct Answer - ✔️✔️PZT >

matching layer > gel > skin


Characteristics of the backing material - Correct Answer - ✔️✔️-

high degree of sound absorption


-acoustic impedance similar To PZT


-sound energy is absorbed in the backing material

, *Three consequences - Correct Answer - ✔️✔️-Decrease

sensitivity


-Wide bandwidth


-Low quality factor (Q-factor)


*Decreased sensitivity - Correct Answer - ✔️✔️not able to

convert low-level sound reflections into meaningful electrical signals


*Wide bandwidth - Correct Answer - ✔️✔️short pulse duration

has wide bandwidth with many frequencies


*Low Q-factor - Correct Answer - ✔️✔️shorter pulses have

lower q-factor


Decreased sensitivity - Correct Answer - ✔️✔️when damping is

applied to the crystal, pulses are shortened and the transducer is less

able to convert low-level sound reflections into meaningful electrical

signals during reception.

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