MR imaging technique in which a set of projection profiles of the body is obtained by observing MR signals in the presence of a suitable corresponding set of magnetic field gradients. Images can then be reconstructed using techniques analogous to those used in conventional computed tomography (CT), such as filtered back projection. It can be used for volume imaging or, with plane selection techniques, for sequential plane imaging.

Briefly applied magnetic field gradients.

See also Bipolar Gradient Pulse and Gradient Magnetic Field.

Magnetic field gradient applied during the period when the receiver components are on. The application of this gradient, which is active during the period when the echo is being formed, results in the frequency encoding of the object being imaged.
Also called frequency encoding gradient.

Technique of MR imaging that uses a gradient of the RF excitation field (to give a corresponding variation of the flip angle along the gradient as a means of encoding the spatial location of spins in the direction of the RF field gradient) in conjunction with a static magnetic field gradient (to give spatial encoding in an orthogonal direction). It can be considered to be a form of Fourier transformation imaging.

A preselected set of RF (and/or gradient) magnetic field pulses and time spacing between these pulses; used in conjunction with magnetic field gradients and MR signal reception to produce MR images.

See also Pulse Sequence , Interpulse Times and the info sheet.