525 Week 2 Quiz

30 Questions | By Djfrollo | Updated: Mar 19, 2022 | Attempts: 62

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Questions and Answers

1.

The main purpose of ultrasound is to:
- A.
  
  Increase the extensibility of tendons, ligaments, and joint capsules
- B.
  
  Raise the temperature of deep structures such as tendons, ligaments, and joint capsules
- C.
  
  Raise the temperature of adipose tissue found in the subcutaneous layer
- D.
  
  Raise the temperature of the bony structures that are the origin points of muscles
2.

Ultrasound may penetrate up to how many centimeters?
- A.
  
  8
- B.
  
  3
- C.
  
  5
- D.
  
  1
3.

Frequency band for medical ultrasound is:
- A.
  
  .3 to 8 mHz
- B.
  
  .1 to 3 mHz
- C.
  
  .3 to 5 mHz
- D.
  
  .8 to 3 mHz
4.

What is ultrasound used for (check the 4 correct answers):
- A.
  
  Used for diagnosis -- imagining of internal structures (pregnancy)
- B.
  
  Used to carbon date fossils
- C.
  
  Used in tissue destruction & surgery
- D.
  
  Used for gene splicing
- E.
  
  Used for tumor irradiation (hypothermia)
- F.
  
  Used to map the human genome
- G.
  
  Used in PM&R to facilitate restoration and healing of soft tissue
5.

What is the "Piezoelectric Effect'?
- A.
  
  Occurs when crystal is heated, producing a sound wave after receiving an electrical current
- B.
  
  Occurs when crystal vibrates and resonates, producing a sound wave after receiving an electrical current
- C.
  
  Occurs when crystal is cooled, producing a sound wave after receiving an electrical current
- D.
  
  Occurs when crystal vibrates and resonates, producing a sound wave after receiving a heat current
6.

The methods of delivery of ultrasound are:1) Direct contact2) Water immersion
- A.
  
  True
- B.
  
  False
7.

The main propagation of ultrasound in soft tissue is:
- A.
  
  Stable cavitation
- B.
  
  Unstable cavitation
- C.
  
  Shear or transverse wave
- D.
  
  Longitudinal or compressional wave
8.

Acoustic impedance is the term that denotes:
- A.
  
  Relative resistance of a medium to wave energy - more dense or heavy molecules are less compliant for being squeezed
- B.
  
  Crystal vibration that produces a sound wave after receiving an electrical current
- C.
  
  Sound propagation
- D.
  
  Compression waves
9.

Sound propagation occurs when waves are generated in rapid succession.
- A.
  
  True
- B.
  
  False
10.

Microstreaming or acoustic streaming is:
- A.
  
  Application of alternating curent
- B.
  
  Sound movement in a fluid field
- C.
  
  Stable cavitation
- D.
  
  Fluid movement in a sound field
11.

Shear waves occur in solid media.
- A.
  
  True
- B.
  
  False
12.

Longtitudinal waves occur in solid media.
- A.
  
  True
- B.
  
  False
13.

Longtitudinal waves occur in liquid and gases.
- A.
  
  True
- B.
  
  False
14.

Longtitudinal waves occur in liquid and gases.
- A.
  
  True
- B.
  
  False
15.

Bone has a HIGH acoustic impedance.
- A.
  
  True
- B.
  
  False
16.

Bone has a LOW acoustic impedance.
- A.
  
  True
- B.
  
  False
17.

Therapeutic ultrasound is a thermal modality which can be used to heat structures:
- A.
  
  Superficially only
- B.
  
  Superficially (0-1cm) or at greater depths (up to 5cm)
- C.
  
  Only at depths greater than 1 cm
- D.
  
  Only when under the direction of an x-ray technician
18.

The MOST COMMON frequency in use for therapeutic ultrasound is (per the Chapter 6 additional reading handout):
- A.
  
  .8 MHz
- B.
  
  1 MHz
- C.
  
  2 MHz
- D.
  
  3 MHz
19.

A frequency of 1 MHz will provide deeper penetration than which other frequency from choices provided:
- A.
  
  .8 MHz
- B.
  
  3 MHz
20.

The larger the sound head or transducer (and therefore the crystal), the greater the divergence of the field.
- A.
  
  True
- B.
  
  False
21.

Intensity is determined by:
- A.
  
  Acoustic power (watts) MULTIPLIED by the effective radiating area (sq. cm) of the transducer (head)
- B.
  
  Acoustic power (watts) DIVIDED by the effective radiating area (sq. cm) of the transducer (head)
22.

Acoustic power means what with regards to therapeutic ultrasound?
- A.
  
  Ohms
- B.
  
  Watts
- C.
  
  Electrical pulses
- D.
  
  BTU's
23.

The term that describes the following is called waht:Movement of molecules occurs in the SAME direction as the flow of energy – the molecules that are pushed forward cause a compression of molecules, creating a wave – the wave continues to expand until the energy is spent
24.

Choose the 3 parameters the OT must set on ultrasound unit before beginning therapy:
- A.
  
  Duty-cycle
- B.
  
  Pulse parameter
- C.
  
  Intensity
- D.
  
  Acoustic impedance
- E.
  
  Frequency
25.

What is the most SIGNIFICANT factor in determining tissue response (hint, it's one of the parameters an OT sets)