Ultrasound Imaging

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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?

Inversely proportional Signup and view all the answers

What is the velocity of sound in bone?

4060 m/s Signup and view all the answers

What is the unit of measurement for acoustic impedance?

Rayl Signup and view all the answers

What is the frequency range of medical Ultrasound waves?

2 MHz to 20 MHz Signup and view all the answers

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

Diffuse Reflection Signup and view all the answers

What is the type of wave that sound is?

Longitudinal wave Signup and view all the answers

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

All of the above Signup and view all the answers

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

To convert electrical impulses into ultrasound waves Signup and view all the answers

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

Attenuation of the signal Signup and view all the answers

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

Strong signal Signup and view all the answers

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

To display the ultrasound image Signup and view all the answers

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

It provides better images of soft tissues Signup and view all the answers

Why is ultrasound the preferred imaging modality for pregnant women?

It is safer for the unborn baby Signup and view all the answers

What is a limitation of ultrasound imaging?

It is disrupted by air or gas Signup and view all the answers

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

It increases body temperature Signup and view all the answers

Why is ultrasound not ideal for imaging large patients?

A greater amount of tissue attenuates the sound waves Signup and view all the answers

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

MRI Signup and view all the answers

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

It provides real-time imaging Signup and view all the answers

What is a characteristic of standard diagnostic ultrasound?

It has no known harmful effects on humans Signup and view all the answers

What can affect the quality of ultrasound imaging?

The presence of air or gas Signup and view all the answers

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

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

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

To eliminate air pockets between the transducer and the skin Signup and view all the answers

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

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

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

To press the transducer firmly against the skin in various locations Signup and view all the answers

What is the ultimate result of the ultrasound procedure?

An image is displayed on a monitor Signup and view all the answers

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

Lying face-up on an examination table Signup and view all the answers