Ultrasound Imaging
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Questions and Answers

In what year was the first application of Ultrasound in medical imaging?

  • 1960
  • 1970
  • 1942 (correct)
  • 1950
  • What is the frequency of sound that produces a sensation of hearing?

  • Appropriate audible frequency (correct)
  • Less than 20,000 Hz
  • Between 20,000 Hz to 2 MHz
  • Greater than 20 MHz
  • What is the unit of measurement for frequency?

  • 1 cycle/min
  • 1 Hz/min
  • 1 Hz/sec
  • 1 cycle/sec (correct)
  • What is the relationship between frequency and wavelength?

    <p>Inversely proportional</p> Signup and view all the answers

    What is the velocity of sound in bone?

    <p>4060 m/s</p> Signup and view all the answers

    What is the unit of measurement for acoustic impedance?

    <p>Rayl</p> Signup and view all the answers

    What is the frequency range of medical Ultrasound waves?

    <p>2 MHz to 20 MHz</p> Signup and view all the answers

    What type of reflection occurs when a sound wave hits a small structure?

    <p>Diffuse Reflection</p> Signup and view all the answers

    What is the type of wave that sound is?

    <p>Longitudinal wave</p> Signup and view all the answers

    What is the main factor that affects the attenuation of ultrasound waves?

    <p>All of the above</p> Signup and view all the answers

    What is the function of the transducer in an ultrasound scanner?

    <p>To convert electrical impulses into ultrasound waves</p> Signup and view all the answers

    What is the result of the reflection, scattering, and absorption of ultrasound waves?

    <p>Attenuation of the signal</p> Signup and view all the answers

    What is the characteristic of the signal reflected by large, regularly shaped objects with smooth surfaces?

    <p>Strong signal</p> Signup and view all the answers

    What is the purpose of the computer in an ultrasound scanner?

    <p>To display the ultrasound image</p> Signup and view all the answers

    What is a characteristic of ultrasound imaging compared to x-ray images?

    <p>It provides better images of soft tissues</p> Signup and view all the answers

    Why is ultrasound the preferred imaging modality for pregnant women?

    <p>It is safer for the unborn baby</p> Signup and view all the answers

    What is a limitation of ultrasound imaging?

    <p>It is disrupted by air or gas</p> Signup and view all the answers

    What is a known effect of ultrasound on the human body?

    <p>It increases body temperature</p> Signup and view all the answers

    Why is ultrasound not ideal for imaging large patients?

    <p>A greater amount of tissue attenuates the sound waves</p> Signup and view all the answers

    What is an alternative imaging modality for visualizing internal bone structures?

    <p>MRI</p> Signup and view all the answers

    What is the advantage of ultrasound in guiding minimally invasive procedures?

    <p>It provides real-time imaging</p> Signup and view all the answers

    What is a characteristic of standard diagnostic ultrasound?

    <p>It has no known harmful effects on humans</p> Signup and view all the answers

    What can affect the quality of ultrasound imaging?

    <p>The presence of air or gas</p> Signup and view all the answers

    What is the primary function of the piezoelectric crystal in ultrasound generation?

    <p>To generate an electric charge in response to applied mechanical stress</p> Signup and view all the answers

    What is the purpose of the clear water-based gel used during an ultrasound exam?

    <p>To eliminate air pockets between the transducer and the skin</p> Signup and view all the answers

    What happens to the ultrasonic beam as it passes through tissues of different acoustic impedance?

    <p>It is attenuated by a combination of absorption, reflection, refraction, and diffusion</p> Signup and view all the answers

    What is the primary role of the sonographer or radiologist during an ultrasound exam?

    <p>To press the transducer firmly against the skin in various locations</p> Signup and view all the answers

    What is the ultimate result of the ultrasound procedure?

    <p>An image is displayed on a monitor</p> Signup and view all the answers

    What is the position of the patient during most ultrasound exams?

    <p>Lying face-up on an examination table</p> Signup and view all the answers

    What is responsible for causing a change in the thickness of the piezoelectric crystal?

    <p>The sonic waves that are reflected back to the transducer</p> Signup and view all the answers

    Ultrasound imaging uses ionizing radiation.

    <p>False</p> Signup and view all the answers

    Ultrasound scanning is a painful procedure.

    <p>False</p> Signup and view all the answers

    Ultrasound is the preferred imaging modality for pregnant women.

    <p>True</p> Signup and view all the answers

    Ultrasound provides real-time imaging.

    <p>True</p> Signup and view all the answers

    Cavitation is a significant risk for humans exposed to ultrasound.

    <p>False</p> Signup and view all the answers

    Ultrasound is suitable for imaging air-filled bowel or organs obscured by the bowel.

    <p>False</p> Signup and view all the answers

    Ultrasound can see the internal structure of bony structures.

    <p>False</p> Signup and view all the answers

    Large patients are easy to image by ultrasound.

    <p>False</p> Signup and view all the answers

    Ultrasound imaging has known harmful effects on humans.

    <p>False</p> Signup and view all the answers

    CT scanning and MRI are alternative imaging modalities for visualizing internal bone structures.

    <p>True</p> Signup and view all the answers

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