A case of compression fracture of vertebrae GE Healthcare © 2013 General Electric Company Fast SE (FSE) and fast recovery fast spin echo-accelerated (FR FSE-XL) Each echo in FSE is spatially encoded so multiple k-space lines can be acquired in the same TR. The number of echoes acquired per TR is called echo train length (ETL). The total imaging time is reduced by ETL factor. Image contrast is determined by (effective) TE of the echoes cor

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