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Fantastic Form-ula
Viva La Resolution
Duck Duck Transducer
So you think you can Impedance
Physics Free For All
100
Density
What is mass/volume?
100
What other names are synonymous with axial resolution.
What is Longitudinal, Axial, Radial, Range, and Depth?
100
Thicker crystals are associated with _____ frequency sound waves.
What are lower frequency sound waves?
100
Acoustic Impedance equals ______.
What is propagation velocity x density?
100
How long does it take for an ultrasound wave to travel 3 cm in tissue one way.
What is 19.5 microseconds.
200
Quality Factor
What is operating frequency/ bandwidth OR 1/ fractional bandwidth?
200
_____ is defined as the number of frames or images created each second.
What is frame rate?
200
This type of transducer is comprised of circular elements within one another.
What is an Annular Array Transducer?
200
When the frequency decreases, absorption_________.
What is absorption decreases?
200
Name the 2 types of waves.
What are electromagnetic and mechanical?
300
Near Zone Length
What is Distance^2 * frequency/ 6?
300
Axial, lateral, and temporal resolution equal __________.
What is Spatial Resolution?
300
Which type of transducer has a greater quality factor: imaging or therapeutic?
What is Therapeutic transducers?
300
Units for impedance are measured in _____?
What are Rayls.
300
When you increase the bulk modulus, the elasticity _____.
What is the elasticity decreases?
400
Bandwidth/2 + base frequency
What is Center Frequency?
400
To improve frame rate: A. Deactivate parallel processing B. Increase color/line density C. Decrease color box depth D. Widen the color box size
What is Decrease color box depth?
400
Frequency and PZT thickness are directly related: true or false?
What is False. They are inversely related.
400
What has a higher acoustic impedance: A. Lung B. Blood C. Water D. Fat
What is blood (1.62 MRayls)? Lung (0.26 MRayls) Water (1.52 MRayls) Fat (1.35 MRayls)
400
Mass is different from weight because weight depends on _________.
What is gravity
500
Intensity
What is power/area?
500
In order for our eyes to see real time motion, the frame rate must be over ____.
What is 17 Hz?
500
If the temperature of the PZT crystal is elevated above the Curie Point, ______ occurs?
What is depolarization?
500
The amount of reflected energy is determined by what 3 things?
What are the incident angle, the type of reflection, and the acoustic impedance mismatch.
500
Which has a lower propagation velocity: A. Spleen B. Kidney C. Mercury D. Water
What is the Mercury (1450 M/sec)? Spleen (1570 M/sec) Kidney (1560 M/sec) Water (1484 M/sec)