Physics: Mri (Spatial Encoding Mri)

Front 1

What are the 3 things that are required to know where a signal is coming from

Back 1

First of all, the desired slice must be selected
Then, spatial information is encoded along the rows
Finally, spatial information is encoded along the columns

Front 2

How is decoding of the MR signal done

Back 2

Decoding of spatial information, included in the NMR signal as modifications of frequency and phase, is performed by an inverse Fourier Transform

Front 3

What is used to determine the location of a slice

Back 3

slice selection gradient (GSS)

Front 4

Which in each slice selection gradient what is done to further pinpoint where the signal is coming from

Back 4

Within this volume, the position of each point will be encoded vertically and horizontally by applying a phase encoding gradient (GPE), and a frequency-encoding gradient (GFE).

Front 5

What is spatial encoding referring to

Back 5

slice selection gradient
phase encoding gradient
frequency encoding gradient

Front 6

What gradient is usually done first

Back 6

First of all, a slice selection gradient (GSS) is used to select the anatomical volume of interest

Front 7

How are the 3 different gradients the same and different

Back 7

The different gradients used to perform spatial localization have identical properties but are applied at distinct moments and in different directions.

Front 8

What is an example of a gradient in the Z-axis

Back 8

Slice selection gradient

Front 9

What is an example of a gradient in the X-axis

Back 9

Left to Right

Front 10

What is an example of a gradient in the Y direction

Back 10

anterior posterior (relative to axial image)