Which technique can increase echo spacing in MRI?

Decreasing the receiving bandwidth in MRI effectively increases the echo spacing. This is because receiving bandwidth is directly related to the frequency range over which the scanner is sensitive to incoming signals. When the receiving bandwidth is reduced, the system allows for longer echo times between signals, which in turn increases the spacing between echoes.

This effect occurs because a narrower bandwidth means that the frequencies collected are more specific, allowing for greater temporal resolution and longer intervals between the echoes recorded. This technique is particularly useful in specific pulse sequences where increased echo spacing might enhance the image quality or reduce certain types of noise or artifacts.

In contrast, decreasing the field of view reduces the spatial extent of the image acquired but does not inherently increase echo spacing. Increasing the receiving bandwidth decreases echo spacing because it captures a wider frequency range simultaneously, thus compressing the timing of echo collection. Increasing flip angle influences the signal intensity and contrast but does not affect the timing between echoes directly.