- Sequence used to identify regions of fatty infiltration and help identify adenomas.
- aka chemical shift imaging
- Relies of differences in the precessional frequency of Hydrogen in fat and water molecules.
- Gradient echo image with TE set to a time where fat and water spins are 180 degrees out of phase causing fat and water signal components within a voxel to destructively interfere and reduce the brightness of the pixel.
- Degree of signal change depends on the ration of fat/water. All fat or all water, no signal drop (compared to in-phase image) 50/50 causes total signal loss
- OOP images identified by dark bands at fat water interfaces
- Select the shortest OOP TE to get best T1 contrast and largest number of slices
- Exact TE depends on filed strength
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