Quiz Exam 2- Ultrasound Physics: Waves (Parameters And Variables)
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?
- 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
Questions: 64 | Attempts: 3928 | Last updated: Jan 7, 2013
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