The MRI phase encoding direction refers to one of the three spatial dimensions along which phase encoding gradients are applied during MRI image acquisition. It determines how spatial …

In Step 1 we apply a phase encoding gradient to dephase spins along the vertical axis. After the gradient has been turned off, the signal from each pixel in the AB column now has a different …

Each MR scanner has 3 sets of spatial encoding electrical coils to produce magnetic fields in the x, y, and z directions. These coils can be adjusted to produce not a constant field but a …

• Three key steps: – Slice selection • You have to pick slice! – Phase Encoding • You have to encode 1 of 2 dimensions within the slice. – Frequency Encoding (aka readout) • You have to …

Oct 10, 2021 · With every cycle the amplitude of the phase encoding gradient is changed so that the phase of the MR signal at a certain y-axis position changes each time. If we look at a …

This section describes the effect of magnetic field gradients during data acquisition to create spatial encoding, and introduces the intuition behind frequency and phase encoding.

The phase encoding gradient (GPE) intervenes for a limited time period. While it is applied, it modifies the spin resonance frequencies, inducing dephasing, which persists after the gradient …

In this section we will introduce the concept of a third category of magnetic field gradient called a phase encoding gradient and incorporate it plus the slice selection gradient and frequency …

There are two important ideas here: The phase shift depends on the integral of the gradient over time. The phase shift does not depend on the frequency at a particular instant. We are …

It explains the application of phase encoding gradients, their impact on spin precession, and their critical role in generating accurate and detailed MRI images.