What is spectral window?

normal straight vessels, blood flows are mostly in parallel and of constant velocities. Thus, Doppler spectral wave- forms appear concentrated and have no low velocity blood flow, thereby forming a so-called spectral window due to the absence of Doppler signal below the spectrum (Fig. 3A, indicated by the arrows).

What is spectral Doppler on ultrasound?

Utilizing automated Fourier analysis to convert returning sound waves into a series of individual frequencies, spectral Doppler refers to ultrasound modalities which yield graphical representations of flow velocity over time.

How do you fix spectral broadening?

Artifactual spectral broadening is dependent on the angle of insonation and will increase as the angle approaches 90°. Maintaining a proper orientation (<60°) of the ultrasound beam can minimize this artifact 2. Care must be taken to use an appropriately sized sample volume within the interrogated blood vessel.

What is the difference between PW and CW?

CW Doppler measures all blood flow velocities along the cursor line. This is in contrast to PW Doppler which measures flow at a specific point within the heart using a sample volume box. Thus CW can measure multiple different blood flows within different cardiac chambers throughout the cardiac cycle.

What is the difference between an ultrasound and a Doppler?

How the Test is Performed. A duplex ultrasound combines: Traditional ultrasound: This uses sound waves that bounce off blood vessels to create pictures. Doppler ultrasound: This records sound waves reflecting off moving objects, such as blood, to measure their speed and other aspects of how they flow.

What are the types of Doppler ultrasound?

In ultrasound, there are two types of spectral Doppler that we use. They are Pulsed Wave Doppler (PW Doppler) and Continuous Wave Doppler (CW Doppler).

What does Doppler ultrasonography detect?

A Doppler ultrasound is a test that uses high-frequency sound waves to measure the amount of blood flow through your arteries and veins , usually those that supply blood to your arms and legs. Vascular flow studies, also known as blood flow studies, can detect abnormal flow within an artery or blood vessel .

What is Arterial doppler test?

Arterial Doppler Exam. An Arterial Doppler evaluates the arterial blood flow of the body. It is used many times to evaluate the arteries of the legs. It may be ordered when there is suspicion on exam or with symptoms suggestive of blockage of the arteries.