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WorksheetsWeek 4 Open Lab quiz
Total questions: 25
Worksheet time: 18mins
Thermal effects of ultrasound include all of the following except:
decreased joint stiffness
increased blood flow
pain modulation
acoustic microstreaming
contraindications for ultrasound include all of the following except:
pregnancy
acute and post acute conditions
bone healing
infection
Which ultrasound frequency is best suited for penetrating deep tissues?
1 MHz
3 MHz
5 MHz
10 MHz
What is the piezoelectric effect?
The generation of electric charge in response to mechanical stress
The absorption of ultrasound waves by tissue
the conversion of electrical energy into thermal energT
The emission of electromagnetic waves from a piezoelectric crystal
What temperature increase corresponds to moderate thermal effects of ultrasound?
1°C increase
2-3°C increase
4°C increase
no temperature increase
In which of the following situations is a vigorous thermal effect of ultrasound most appropriate?
acute injury
subacute injury
chronic inflammation
stretching collagen
What is the appropriate size of area being treated compared to the size of ERA of the crystal?
2-3x the size of the ERA of the crystal
1-2x the size of the ERA of the crystal
4-5x the size of the ERA of the crystal
3-4x the size of the ERA of the crystal
what is an abnormal response to ultrasound?
deep warmth
gentle heat
no heat
stinging
What is the purpose of phonophoresis?
a form of ultrasound that does not go as deep into the tissue
technique of US to deliver medication to the tissue
water immersion technique of US
to heat tissues with direct US contact
Thermal effects of ultrasound include all of the following except:
decreased joint stiffness
increased blood flow
pain modulation
acoustic microstreaming
Contraindications for ultrasound include all of the following except:
pregnancy
infection
acute and post acute conditions
bone healing
What does the Effective Radiating Area (ERA) of a transducer refer to?
A) The area of the transducer that does not produce sound waves
B) The portion of the transducer that produces sound waves
C) The area where the transducer is applied
D) The total size of the transducer
What is the intensity range typically used in ultrasound therapy?
A) 0.5-2.0 W/cm²
B) 1.0-2.0 W/cm²
C) 2.0-3.0 W/cm²
D) 3.0-4.0 W/cm²
What is a characteristic of continuous ultrasound mode?
A) Energy is delivered intermittently
B) Energy is delivered 100% of the time
C) It is used to promote cavitation
D) It has a duty cycle of 20-50%
What is the typical duty cycle range for pulsed ultrasound?
A) 10-20%
B) 20-50%
C) 50-70%
D) 70-100%
Which method of ultrasound application is most appropriate for treating around bony prominences?
A) Direct contact
B) Immersion
C) Bladder
D) None of the above
How long should ultrasound therapy be applied to a large area, such as the whole shoulder?
A) 2-5 minutes
B) 5-10 minutes
C) More than 10 minutes
D) it shouldnt' be applied to the shoulder
What factor determines the effectiveness of the ultrasound treatment area relative to the transducer?
A) The intensity of the ultrasound waves
B) The type of medium used
C) The Effective Radiating Area (ERA)
D) The Beam Nonuniformity Ratio (BNR)
What is ultrasound intensity
magnitude of vibration wave
variation in pressure along the path of wave
amount of energy in the ultrasound beam
rate at which energy is being delivered per unit area
all of the following are true of pulsed ultrasound except
average intensity of output is reduced
no ultrasound is produced during off period
intensity is periodically interrupted
heat is generated
when should ultrasound be used to maximize therapeutic effects
12-24 hours after injury
within 6 hours after injury
within 48 hours after injury
5 days after injury
How does collagen affect the absorption of ultrasound energy in tissues?
it prevents absorption
it absorbs energy more efficiently
it reflects ultrasound waves
it reduces temperature rise
What does the term "attenuation" refer to in the context of acoustic energy?
increase in sound intensity
loss of energy as sound travels
speed of sound in tissues
increase in sound energy as it travels
Which of the following factors can contribute to the attenuation of acoustic energy in tissues?
frequency only
density of tissue only
absorption, reflection, and refraction
waveform type only
how much would you increase tissue temperature for chronic inflammation, pain and trigger points?
you wouldn't increase tissue temperate
1* C
2-3* C
3-4* C
