Test 1 Left Out Stuff Flashcards
Lungs have the lowest ____ in the body
Propagation speed
What is stiffness
Resistance to compression
A longitudinal wave is _____ and ______
Mechanical and compressional
Transverse waves are not ________
Compressional
Describe the pulse echo technique in the use of ultrasound
The transducer sends out pulses, these pulses reflect of boundaries and are sent back to the transducer. The echos are represented as dots on the screen with the brightness reflecting the strength of the returning echos
Describe harmonic productions
The more dense and high pressure areas of the sound beam move faster than the less. This changes the wave from and produces the multiples of the original fundamental frequency
What are the typical number of pulses in ultrasound
2-3
What are the typical number of pulses in a doppler pulse
5-30
What affect the bandwidth
SPL
Which is better and larger or smaller bandwidth
Larger
Which is better, a larger or small quality factor
Smaller
A wave is sa travelling variation in quantities called wave _________
Variables
What is bandwidth
Range of frequencies produced by transducer
Wide bandwidth transducers can operate over a ______ ranger of frequencies
Wide
Wide bandwidth offer _____
Flexibility
