MRI Flashcards
1
Q
Seen as dark border on one side of a structure and a light border on the opposite side
A
Chemical shift
2
Q
FOV smaller than the body part being imaged
A
Aliasing
3
Q
Dark or light lines parallel to borders of abrupt intensity change
Seen commonly in the spinal cord
A
Gibbs( truncation)
4
Q
Seen as dotted line across an image
A
Zipper
5
Q
Repeated ghost structures in the phase direction
A
Motion
6
Q
Field homogeneity degrades over large FOV toward the edge
A
Moire
7
Q
Process responsible for the dissipation of energy from radiofrequency excited protons into their molecular environment or lattice
A
Spin-lattice relaxation
Longitudinal or T1
8
Q
Progressively reduces order after an excitation pulse
A
Spin-spin relaxation
Transverse or T2
