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What is one of the main characteristics of a FSE sequence?

Consists of multiple repetition times

Uses only gradient echo techniques

Involves consecutive spin echoes

A Fast Spin Echo (FSE) sequence is characterized primarily by the use of consecutive spin echoes to efficiently collect data. This approach allows for faster imaging times compared to traditional spin echo sequences. In FSE, multiple 180-degree refocusing pulses are applied in rapid succession after an initial 90-degree pulse, generating multiple echoes that are acquired within a single repetition time (TR). This enables the sequence to cover a greater portion of k-space in a shorter period, improving overall image acquisition speed while maintaining high image quality.

The use of multiple spin echoes in a short time frame allows for heightened signal-to-noise ratios and minimization of motion artifacts, which are crucial in clinical imaging scenarios. By accumulating multiple echoes in a single TR, FSE sequences can produce high-resolution images efficiently, making them a preferred choice in many MRI applications.

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Focused on frequency past the Nyquist limit

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