(TSE) A pulse sequence characterized by a series of rapidly applied 180° rephasing pulses and multiple echoes.

See Fast spin echo.

(TSE TF) The turbo factor is the number of echoes acquired after each excitation. This is a measure of the scan time acceleration, e.g. at turbo factor 3 the scan time is 3 times faster as a SE sequence with comparable parameters. In combination with profile order and effective echo time the TSE turbo factor controls the echo spacing.

See also Scan Time and Echo Spacing.

An ultrafast gradient echo pulse sequence with data acquisition after an initial 180° (similar to IR) preparation pulse for contrast enhancement.
See Fast Low Angle Shot and Ultrafast Gradient Echo Sequence.

A gradient pulse designed to dephase low spatial frequency components in an image. The simplest such design is to choose the gradient strength so that a linear phase change of -p to p is generated across the image.