Understanding Ultrasound Physics Chapter 8 Exam Questions and Answers
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Course
Understanding Ultrasound
Institution
Understanding Ultrasound
Transmission - ANSWER-Electrical energy from the system is converted into sound
Reception - ANSWER-The reflected sound pulse is converted into electricity
Piezoelectric Effect - ANSWER-The property of certain materials to create a voltage when they mechanically deformed or when pressure is ap...
Understanding Ultrasound Physics Chapter 8 Exam Questions and Answers
Transmission - ANSWER-Electrical energy from the system is converted into sound
Reception - ANSWER-The reflected sound pulse is converted into electricity
Piezoelectric Effect - ANSWER-The property of certain materials to create a voltage when they mechanically deformed or when pressure is applied to them
Reverse Piezoelectric Effect - ANSWER-Piezoelectric materials change shape when a voltage is applied to them
Piezoelectric Materials - ANSWER-Materials which convert sound into electricity (and vice versa) are called piezoelectric or ferroelectric
PZT - ANSWER-Lead Zirconate Titanate
PZT is also called - ANSWER-Ceramic, active element, or crystal
Case - ANSWER-The cylindrical tube, constructed of metal or plastic, that protects the internal components of the transducer from damage
Electrical Field - ANSWER-A thin metallic barrier lining the inside of the case. The shield prevents spurious electrical signals in the air, unrelated to diagnostic information, from entering the transducer
PZT or Active Element - ANSWER-The piezoelectric crystal itself.
Wire - ANSWER-Provides an electrical connection between the PZT and the ultrasound
system
Matching Layer - ANSWER-Positioned in front of the PZT at the face of the transducer.
Backing Material - ANSWER-Bonded to the back of the active element, it reduces the "ringing" of the PZT.
Resonant Frequency - ANSWER-The tone is pure because the string vibrates freely for a long time at a single frequency
Bandwidth - ANSWER-Range of frequencies in the pulse
Quality Factor - ANSWER-Unitless number that is inversely related to bandwidth
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