The key to obtaining an image, like in MRI, as opposed to a graph, like in NMR, is to create a(n) _____.
A) high resonance frequency
B) low resonance frequency
C) internal magnetic field that remains constant in space
D) external magnetic field that varies in space
E) electrical current

Question

Quizplus · Accepted Answer

To obtain an image in MRI, an external magnetic field is used that varies in space. This creates a gradient of magnetic field strength that allows for spatial encoding of the image. NMR, on the other hand, uses a constant internal magnetic field to generate a signal that is analyzed as a graph.

The Key to Obtaining an Image, Like in MRI, as Opposed