Week 1 Pulse-Echo Technique

These flashcards cover key concepts and terminology related to the physics of ultrasound as discussed in the lecture.

What is the pulse-echo principle?

It is a technique used in diagnostic ultrasound where transducers send ultrasound pulses into the body, and echoes return to produce images.

What is echolocation?

A method that uses the speed of sound to determine the distance between the transducer and tissues/interfaces based on the round-trip time of the echo.

How is velocity calculated in ultrasound imaging?

Velocity (ν) is calculated using the formula: ν = d x 2 / t, where d is distance and t is time.

What are the three types of Pulsed Wave Doppler imaging?

1) PW Spectral Doppler 2) PW Colour Doppler 3) PW Power Doppler.

What does B-mode represent in ultrasound imaging?

B-mode represents grey scale images produced based on the strength of the echoes returning to the transducer.

What does more scan lines in a sonographic image result in?

More scan lines result in better image quality.

What is needed for real-time imaging in ultrasound?

Real-time imaging requires capturing many frames per second.

What is the difference between A-mode and B-mode in ultrasound?

A-mode represents the amplitude of the echoes as a function of depth, while B-mode creates two-dimensional images based on the brightness of the echoes.

What is color Doppler used for in ultrasound imaging?

Color Doppler is used to analyze the direction and velocity of blood flow within vessels.

What is the role of power Doppler in ultrasound imaging?

Power Doppler provides information about the amplitude of blood flow but does not provide directional flow information.