Ultrasonic Therapy Quiz

What is the frequency range of ultrasound used in physiotherapy?

• 20-20000 Hz

• 0.5 to 5 MHz

• 1 MHz

• 3 MHz

What is the term used to describe the gradual reduction in intensity of the ultrasonic beam once it has left the treatment head?

• Refraction

• Attenuation

• Absorption

• Scatter

What is the half-value distance for soft tissue at 1 MHz output?

• 2 cm

• 4 cm

• 1 cm

• 3 cm

For treating chronic scar tissue, what is the recommended ultrasound intensity?

• 0.1–0.25 W/cm²

• 0.25–1 W/cm²

• 1.5–2 W/cm²

• 2–3 W/cm²

What are the characteristics of a good coupling media?

• High viscosity, low thermal conductivity, toxic
• High acoustic reflection, unstable, incompatible
• High acoustic transparency, low viscosity, good thermal conductivity, non-toxic, stable, and compatible.
• Poor thermal conductivity, non-toxic, high density

What is the acoustic impedance of a coupling media?

• The acoustic impedance is solely determined by temperature.
• The acoustic impedance of a medium is irrelevant to sound transmission.
• The acoustic impedance of a coupling medium is the product of its density and the speed of sound in that medium.
• Acoustic impedance is the ratio of pressure to volume in a medium.

What is the effect of air on ultrasound transmission?

• Air enhances ultrasound transmission by increasing speed.
• Air has no effect on ultrasound transmission.
• Air amplifies ultrasound signals without any loss.
• Air reduces ultrasound transmission due to reflection and attenuation.

What is the primary use of therapeutic ultrasound?

• Diagnosis

• Destruction of tissues

• Pain relief

• Imaging

What is the depth of penetration for 3 MHz ultrasound?

• 1 cm

• 2 cm

• 3 cm

• 4 cm

What is the unit of ultrasound intensity?

• Watt

• Joule

• Pascal

• Newton