Which of these statements accurately describes features of the gradient field method used for improving MRI image resolution?
A)The magnetic field is set to vary by three coils in three dimensions, producing very large changes of the field with gradients reaching up to 20 T.
B)The magnetic field is set to vary by three coils in three dimensions, producing changes of the field with gradients in the range of millitesla.
C)The magnetic field is set to vary by rotating fast in a circular path, producing very large changes of the field with gradients reaching up to 20 T.
D)The magnetic field is set to vary by rotating fast in a circular path, producing changes of the field with gradients in the range of millitesla.

Question

Quizplus · Accepted Answer

The gradient field method in MRI involves varying the magnetic field in three dimensions using three coils, with the changes in the magnetic field being in the range of millitesla per meter. This allows for spatial encoding of the MRI signal, which is crucial for image formation and resolution improvement. The gradients are not as high as 20 T and do not involve rapid circular rotation.

Which of These Statements Accurately Describes Features of the Gradient