What effect does increasing the flip angle in gradient echo sequences generally have?

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Increasing the flip angle in gradient echo sequences enhances the signal-to-noise ratio (SNR). This occurs because a larger flip angle results in a greater longitudinal magnetization component being tipped into the transverse plane, which effectively produces a stronger signal during the readout period. The greater the amount of transverse magnetization, the more substantial the signal detected by the MRI scanner, thus improving the SNR.

Additionally, in the context of gradient echo sequences, a higher flip angle can also lead to better visualization of structures, particularly in T1-weighted imaging, where increased flip angles can produce more pronounced differences in signal intensity between tissues of varying T1 relaxation times. This aspect can directly contribute to enhanced imaging quality, making diagnostic information clearer.

While other results may occur from adjustments in flip angles, they do not generally lead to the enhanced SNR that is characteristic of higher flip angles in gradient echo sequences.

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