Ultrasound physics Harmonic Imaging and Contrast Agents Quiz

What is the fundamental frequency of a 2MHz transducer?

• 4 MHz

• 2 MHz

• 1 MHz

• 3 MHz

Tags

NGSS.HS-PS4-1

What is the harmonic frequency the machine listens for of that 2MHz transducer?

• 1 MHz

• 2 MHz

• 3 MHz

• 4 MHz

Tags

NGSS.HS-PS4-1

What is the main advantage of harmonic imaging over fundamental imaging?

• Increased artifacts in the near field

• Improved lateral resolution

• Increased noise

• Reduced lateral resolution

Which type of behavior is tissue harmonics associated with?

• Nonlinear

• Proportional

• Linear

• Symmetrical

What is the main disadvantage of pulse inversion harmonics method?

• Increased temporal resolution

• Reduced frame rate

• Reduced temporal resolution

• Improved frame rate

What is the purpose of contrast agents in ultrasound imaging?

• To eliminate reflections

• To create strong reflections

• To create weak reflections

• To reduce reflections

Tags

NGSS.HS-PS4-5

What determines the stability and longevity of contrast agents in the circulation?

• Nature of the outer shell

• Size of the gas molecules

• Both A and B

• None of the above

Tags

NGSS.HS-PS2-6

All are characteristics of tissue harmonics EXCEPT?

• Weaker harmonic signal

• Stronger harmonic signal

• Results from nonlinear behavior of transmitted sound beam

• Created during transmission in tissue

Tags

NGSS.HS-PS4-1

NGSS.HS-PS4-5

What is the mechanical index (MI) used for in ultrasound imaging?

• To estimate the frequency of the transmitted sound

• To estimate tissue harmonics that will be created by a sound beam

• To estimate contrast harmonics that will be created by a sound beam.

• To estimate both contrast and tissue harmonics

Tags

NGSS.HS-PS4-5

Beams that are most likely to create harmonics are the most likely to create artifacts.

• True

• False

Tags

NGSS.HS-PS4-1