Another is to recreate a field map of the main field by acquiring two images with differing echo times.
2.
Time-of-flight ( TOF ) or inflow angiography, uses a short echo time and flow compensation to make flowing blood much brighter than stationary tissue.
3.
The resulting signal decays exponentially as the echo time ( TE ), i . e ., the time after excitation at which readout occurs, increases.
4.
The idea is to construct images of tissue by measuring the echo time delay of light that is reflected or back-scattered from nearby structures inside the tissue,
5.
The choice of the gradient-echo time ( e . g ., in-phase vs opposed-phase conditions ) further alters the representation of water and fat signals in the images and will allow for separate water / fat movies.
6.
Because of the very short echo times ( e . g ., 1 to 2 milliseconds ), the method does not suffer from off-resonance effects, so that the images neither exhibit susceptibility artifacts nor rely on fat suppression.
7.
Let me rephrase; is there a tool that will help me do it without the brute force method of $ a = time ( ); echo time ( )-$ a; contribs ) 00 : 49, 9 August 2012 ( UTC)
8.
In light of its importance for music history, Moses et al . size up the acoustic properties of the church : its many hard surfaces and its high dome result in an echo time they estimate at 4 1 / 2 to 5 1 / 2 seconds.
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