velocity encoding

velocity encoding

An MRI term for a specialised technique used to encode flow velocities. The velocity encoding value is given by:
VENC = pi / gamma DELTA M1, where Gamma = gyromagnetic ratio, and DELTA M1 = gradient moment proportional to the area of the flow encoding the gradient waveform.
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Velocity encoding phase contrast cine imaging (VEPC imaging)
Craniocaudal velocity encoding was applied in midsagittal, and anteroposterior velocity encoding in perpendicular plane to the third ventricle floor in both FISP 2D sequences.
Time-resolved 2D PC-MRI with velocity encoding in one spatial direction is the method of choice for investigation of CSF flow.
The phase contrast velocity encoding technique can also be used for myocardial tissue velocity mapping.
However, signal loss from intravoxel phase dispersion can be alleviated by proper selection of velocity encoding (VENC) relative to the renal vessels.[7,10]
These can be quantified with phase contrast (PC) velocity encoding, which provides an instantaneous measure of fluid velocity, and can be used to provide velocity-time and flow-time curves through the valves and the great vessels, thus allowing calculation of pressure gradients.

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