Line and slice selection for moving spins
Related Experiment Video
Updated: Oct 24, 2026

Slice It Hot: Acute Adult Brain Slicing in Physiological Temperature
Published on: October 30, 2014
1Gordon Institute, Wakefield, Massachusetts.
Abstract:
The Bloch equations are solved numerically for spins moving at constant velocity for the case of 90 degrees slice selection, and for subsequent 180 degrees spin-echo line selection. The calculations use the comoving, rotating reference frame which is shown to be valid for general accelerated motions. Magnetization profiles and phase shifts are presented for slice selection for both plug and laminar flow. Line selection is studied for the case of plug flow, where a "local vector sum" is introduced to demonstrate effective localization of activated spins. In addition to local magnetization densities, the spatially integrated signals seen by a nonselective antenna are calculated. The relation between net phase shift and flow rate is examined and deviations from the predictions of simple analytic models are discussed.
Related Concept Videos
Force Vector along a Line
Drag Force and Terminal Speed
Rolling Without Slipping
Rotation of Asymmetric Top
The relationship between the angular momentum of any rigid body and its angular velocity, both of which are vectors, involves the moment of inertia. The moment of inertia is a scalar quantity only for spherically symmetric...
Relative Motion Analysis - Velocity
When an external force is exerted, it sets the crank into a rotational movement. This, in turn, instigates the motion of the connecting rod, leading to what is referred to as a general plane motion. This process involves two key points - point A on the connecting rod...
Adjusting a Traverse

