Flow Resistance and Doppler Ultrasound Concepts

These flashcards cover key concepts from the lecture regarding flow resistance, Doppler ultrasound, and related measurements.

What factors affect flow resistance in a vessel?

Blood viscosity, vessel length, vessel radius, and all of the above.

Which concept is not related to continuous wave Doppler?

Backing material.

How does flow resistance affect the volumetric flow (Q) rate?

As flow resistance increases, the volumetric flow rate decreases.

What equation describes the relationship between flow rate, pressure gradient, vessel radius, and blood viscosity?

Poiseuille's equation.

What is the unit used to measure viscosity of blood?

Poise.

What is the area of interrogation in a pulsed Doppler exam called?

Sample volume.

What factors affect venous pressure and flow?

Velocity of blood and respiration.

What is the wall filter used for in Doppler?

It is a type of aliasing control.

What is spectral broadening?

A filling of the spectral window, typically seen with laminar flow states.