Quiz Exam 2- Ultrasound Physics: Waves (Parameters And Variables)

69 Questions | By A_landis2 | Last updated: Mar 20, 2022 | Total Attempts: 402

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Ultrasounds are sound waves with frequencies too high for the upper audible limit of human hearing, and this can merely be “heard” through sight, with images gathered from ultrasound machines. What can you tell us about the physics behind this?

Questions and Answers

1.

Electromagnetic waves can exist in...
- A.
  
  Medium only
- B.
  
  Vaccum only
- C.
  
  Both
2.

Mechanical waves can exist in...
- A.
  
  Medium only
- B.
  
  Vaccum only
- C.
  
  Both
3.

Electromagnetic wave direction
- A.
  
  Transverse
- B.
  
  Longitudinal
- C.
  
  Parallel
- D.
  
  Perpendicular
4.

Mechanical wave direction
- A.
  
  Transverse
- B.
  
  Longitudinal
- C.
  
  Parallel
- D.
  
  Perpendicular
5.

Which of the following parameters is inconsequential to clinical ultrasound?
- A.
  
  Pressure
- B.
  
  Temperature
- C.
  
  Density
- D.
  
  Partical Motion
6.

What occurs during compression?
- A.
  
  Increased pressure, decresed density
- B.
  
  Increased pressure, increased density
- C.
  
  Decreased pressure, decreased density
- D.
  
  Decreased pressure, increased density
7.

What occurs during rarefaction?
- A.
  
  Increased pressure, decresed density
- B.
  
  Increased pressure, increased density
- C.
  
  Decreased pressure, decreased density
- D.
  
  Decreased pressure, increased density
8.

Period: units
- A.
  
  Seconds
- B.
  
  Milliseconds
- C.
  
  Microseconds
- D.
  
  Nanoseconds
9.

Period: typical values
- A.
  
  .1-.5 µs
- B.
  
  .01-.15 µs
- C.
  
  .05-.1 ms
- D.
  
  .1-.5 ms
10.

Period is determined by sound source only
- A.
  
  True
- B.
  
  False
11.

Period is not adjustable
- A.
  
  True
- B.
  
  False
12.

Frequency: units
- A.
  
  Decibels
- B.
  
  Watts
- C.
  
  Hertz
- D.
  
  Milliseconds
13.

Frequency: Typical Values
- A.
  
  1-2 Hz
- B.
  
  2-10 Hz
- C.
  
  1-2 MHz
- D.
  
  2-10 MHz
14.

Which of the following can be determined by medium?
- A.
  
  Power
- B.
  
  Frequency
- C.
  
  Wavelength
- D.
  
  Intensity
- E.
  
  Amplitude
- F.
  
  Period
- G.
  
  Propagation Speed
15.

Which of the following are adjustable by the sonographer?
- A.
  
  Intensity
- B.
  
  Frequency
- C.
  
  Power
- D.
  
  Propagation Speed
- E.
  
  Period
- F.
  
  Wavelength
- G.
  
  Amplitude
16.

Wavelength: Units
- A.
  
  Millimeters
- B.
  
  Centimeters
- C.
  
  Watts
- D.
  
  Milliseconds
17.

Wavelength: Typical Values
- A.
  
  .15-.8 mm
- B.
  
  .01-.5 ms
- C.
  
  .15-.8 ms
- D.
  
  .1-.5 mm
18.

Propagation Speed: Units
- A.
  
  Mm
- B.
  
  Cm
- C.
  
  W/cm
- D.
  
  Ms/s
19.

Propagation speed of air?
- A.
  
  500
- B.
  
  4000
- C.
  
  1560
- D.
  
  330
20.

Propagation speed of soft tissue?
- A.
  
  1540
- B.
  
  1450
- C.
  
  4000
- D.
  
  500
21.

Propagation speed of bone?
- A.
  
  1560
- B.
  
  1700
- C.
  
  3500
- D.
  
  4000
22.

Amplitude: Units
- A.
  
  Pascals
- B.
  
  Decibels
- C.
  
  Watts
- D.
  
  Hertz
23.

Amplitude: Typical Values
- A.
  
  1-3 Pa
- B.
  
  .1-.3 MPa
- C.
  
  1-3 MPa
- D.
  
  2-4 MPa
24.

Power: Units
- A.
  
  Watts
- B.
  
  Milliwatts
- C.
  
  Watts/cm³
- D.
  
  Megawatts
25.

Power: Typical Values
- A.
  
  .004-.080 W
- B.
  
  4-90 mW
- C.
  
  2-10 W
- D.
  
  .01-.1 mW