Ultrasound Physics Chapters 4 and 5, Pulsed US & Intensities

Which of the following is NOT one of the seven parameters of sound waves?

• Frequency

• Temperature

• Amplitude

• Wavelength

Tags

NGSS.HS-PS4-1

Ultrasound uses which of the following types of waves?

• Only CW

• Only PW

• Both CW and PW

• Neither CW nor PW

Based on the diagrams, how do pulsed waves differ from continuous waves in the context of image creation?

• Pulsed waves alternate between transmitting and receiving, while continuous waves only transmit

• Pulsed waves are always on, while continuous waves are always off

• Continuous waves alternate between transmitting and receiving, while pulsed waves only transmit

• Both types of waves alternate between transmitting and receiving

Tags

NGSS.HS-PS4-1

What is the difference in the two types of waveforms represented in this image?

• The amplitude of two different waves

• The frequency of two different waves

• A single cycle versus multiple cycles in a pulse

• The speed of sound in different media

Tags

NGSS.HS-PS4-1

How does pulsed wave ultrasound differ from continuous wave ultrasound?

• They have an on and an off time

• They are always continuous

• They never repeat

• They have no pattern

Tags

NGSS.HS-PS4-5

Which of the following best describes the difference between a continuous wave and a pulse?

• A continuous wave has no breaks, while a pulse has groups of cycles with clear breaks

• A pulse is always louder than a continuous wave

• A continuous wave is random, while a pulse is regular

• A pulse has no cycles, while a continuous wave does

What is the typical number of cycles per pulse emitted by clinical ultrasound to create a grayscale (b-mode) image?

• 2-4 cycles

• 5-7 cycles

• 8-10 cycles

• 10-12 cycles

Which of the following parameters is affected by a decrease in the imaging depth? (more than one may be correct)

• Increased PRF

• Decreased PRF

• Increased PRP

• Decreased PRP

• Imaging depth does not affect any of the listed parameters

Tags

NGSS.HS-PS4-1

Which of the following is a correct unit for measuring pulse duration?

• Hertz (Hz)

• Meters (m)

• Microseconds (μs)

• Volts (V)

Pulse duration is determined by which of the following?

• The operator

• The machine

• The patient

• The environment