Question

Dixon aka Out-of-Phase imaging (fat-suppressed images): Used in gradient echo sequences to null the signal from voxels in which fat and water coexist. Achieved by selecting a specific TE when fat and water are 180 degrees out of phase with each other.

A) True
B) False

Answer 1

The statement is true; Dixon or Out-of-Phase imaging suppresses signals from voxels with both fat and water by using a specific echo time when their protons are 180 degrees out of phase.

Step-by-step explanation:

Dixon or Out-of-Phase imaging is indeed used in gradient echo sequences to suppress the signal from voxels where fat and water coexist. This is achieved by selecting a specific echo time (TE) when fat and water protons are 180 degrees out of phase with each other. Therefore, the statement provided is True. Magnetic resonance imaging (MRI) utilizes this and other techniques to enhance contrast in images, allowing for a more detailed analysis of tissue type and status, such as the presence of inflammation, based on different relaxation mechanisms of the nuclei within the body.