Ultrasound Physics
28 Questions
0 Views

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

What is the role of the metal plate in a transducer?

  • To attach the crystal to the coaxial cable
  • To convert mechanical energy to electrical energy (correct)
  • To transmit high frequency AC
  • To amplify the ultrasound waves

    • What type of wave does ultrasound travel as in bone?

  • Transverse wave (correct)
  • Electromagnetic wave
  • Mechanical wave
  • Longitudinal wave

    • What happens to ultrasound waves as they travel through tissue?

  • They are scattered in all directions
  • They are reflected and refracted (correct)
  • They are absorbed and penetrate deeper
  • They are amplified

    • What is the effect of increasing the frequency of ultrasound waves?

    <p>Increased absorption in superficial tissues (C)</p> Signup and view all the answers

    What is the suitable frequency for treating deeper lesions (3-5cm)?

    <p>1MHz (A)</p> Signup and view all the answers

    What is the maximum intensity of ultrasound that can be used without causing tissue damage?

    <p>2.5-3W.cm2 (D)</p> Signup and view all the answers

    What is the primary effect of continuous mode ultrasound treatment?

    <p>Thermal effect (B)</p> Signup and view all the answers

    What is the significance of the duty cycle in ultrasound treatment?

    <p>It depends on the frequency, intensity, and treatment area (B)</p> Signup and view all the answers

    How long does it take to achieve a 4°C increase in local temperature using 1MHz at 1.5W/cm2 ultrasound?

    <p>12 minutes (B)</p> Signup and view all the answers

    What is the purpose of a conducting material in ultrasound treatment?

    <p>To decrease the impedance at the air-skin interface (D)</p> Signup and view all the answers

    What is the primary effect of a 1°C increase in temperature?

    <p>Increase metabolic rate (C)</p> Signup and view all the answers

    What is the primary benefit of non-thermal effects in ultrasound therapy?

    <p>Decreased edema and promotion of cellular repair (D)</p> Signup and view all the answers

    What is the result of molecular agitation in ultrasound therapy?

    <p>Formation of tiny gas bubbles in tissues (B)</p> Signup and view all the answers

    What is the purpose of using a pulsed mode with a duty cycle of 20-25%?

    <p>To achieve non-thermal effects (D)</p> Signup and view all the answers

    What is the result of the longitudinal waves of the US beam on the tissue fluid?

    <p>Compression and rarefaction of the cells (D)</p> Signup and view all the answers

    What is the benefit of using intensities lower than 0.5 W/cm2 in continuous mode?

    <p>To achieve non-thermal effects (B)</p> Signup and view all the answers

    What is the absorption rate of energy produced by 3 MHz ultrasound compared to 1 MHz ultrasound?

    <p>Three times faster (D)</p> Signup and view all the answers

    What is the recommended treatment duration for ultrasound therapy?

    <p>5 to 10 minutes (D)</p> Signup and view all the answers

    What is the contraindication for ultrasound treatment over the spinal column or brain?

    <p>Over the spinal column or brain (B)</p> Signup and view all the answers

    In chronic conditions, how often should ultrasound treatment be applied?

    <p>Every other day (A)</p> Signup and view all the answers

    What is the indication for ultrasound treatment in cases of non-septic periarthritis?

    <p>Periarthritis (non-septic) (B)</p> Signup and view all the answers

    What should be done if no improvement is noted after three or four ultrasound treatments?

    <p>Employ different parameters (C)</p> Signup and view all the answers

    What is the primary purpose of increasing the intensity by 50% during the immersion application procedure?

    <p>To enhance the penetration of ultrasound waves (A)</p> Signup and view all the answers

    What is the main function of the coupling medium in the balloon application procedure?

    <p>To enhance the transmission of sound waves (D)</p> Signup and view all the answers

    What is the primary mechanism by which phonophoresis enhances the effects of topical drugs?

    <p>By pushing particles of the drug deeper into the skin tissues (D)</p> Signup and view all the answers

    During the immersion application procedure, what is the recommended distance between the ultrasound head and the skin surface?

    <p>0.5 to 1 cm (A)</p> Signup and view all the answers

    What is the typical range of penetration for the intensity heat generated during the treatment?

    <p>4-6 cm (A)</p> Signup and view all the answers

    What is the primary advantage of using the balloon application procedure over the immersion application procedure?

    <p>It allows for more precise control over the treatment area (C)</p> Signup and view all the answers

    More Like This

    Use Quizgecko on...
    Browser
    Open
    Browser
    Browser