Items tagged “doppler”
12 results found
Saphenous valve incompetence
Published 04 Sep 2012
Hypraemia in diabetic foot
Published 18 Apr 2013
Power Doppler is a technique that uses the amplitude of Doppler signal to detect moving matter. Power Doppler: is independent of velocity and direction of flow, so there is no possibility of signal aliasing is independent of angle, allowing detection of smaller velocities than color Doppler, f...
Femoral artery pseudoaneurysm
Published 06 Jan 2015
TIPS evaluation is useful to ensure that the shunt is working properly and that no stenosis has occurred within the stent. Ultrasound is often used as a first-line modality. Radiographic features Ultrasound The normal TIPS should show color Doppler flow throughout its length. The in-stent vel...
Normal hepatic vein Doppler
The hepatic veins have a characteristic spectral Doppler waveform. Alterations in the normal hepatic vein waveform may reveal or confirm abnormalities in the heart or liver. Terminology The key factor in the shape of the hepatic vein spectral Doppler waveform is the motion of the heart. Multip...
The wall filter in ultrasound is a way of filtering out low or high frequency Doppler signals. In clinical ultrasound, it is usually used to filter out very low frequencies that may add noise to a spectral Doppler waveform. A typical use is removing the low frequency reverberation of an arteria...
Early onset IUGR with critical Dopplers
Published 18 Jul 2018
Pulmonary venous doppler waveform (illustration)
Diagnosis not applicable
Published 03 Mar 2019
Transcranial Doppler sonography (ultrasound)
Transcranial Doppler (TCD), also known as transcranial color-coded duplex sonography (TCCS) is a sonographic study of intracranial structures and blood vessels, used most commonly to identify the hemodynamic state present in the vertebrobasilar circulation and the circle of Willis. Termin...
Spectral Doppler (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. Terminology The frequency of the sound waves returned to an ultraso...
Tissue Doppler imaging (echocardiography)
A variant of pulsed wave Doppler, tissue Doppler imaging (TDI) is a modality in echocardiography that allows measurement of the velocity of myocardial movement throughout the cardiac cycle. Physics Color flow, pulsed wave, and continuous wave Doppler are designed to analyze the Doppler shifts ...