Short name: Mn(III)TPPS4, chemical compound: manganese(III) tetra-[4- sulfanatophenyl] porphyrin, central moiety: Mn2+, relaxivity: r1=7.5, r2=8.6
Manganese(III) TPPS4 is an agent under development (preclin. for MRI contrast medium) with tumor selective uptake for tumor detection and control.

See also Metalloporphyrins.

(MSE) A spin echo technique with a flip angle over 90°.

See Spin Echo Sequence and Fast Spin Echo.

(MTF) Mathematical procedure for measuring resolution.

Modulus images acquired with an Inversion Recovery Sequence do not take negative magnetization spin values into account. The "real" image, displayed with a bright background is recommended for correct tissue contrast.

Quick Overview

A moiré pattern is an interference pattern created for example when two grids are overlaid at an angle, or when they have slightly different mesh sizes. The human visual system creates an imaginary pattern of roughly horizontal dark and light bands, the moiré pattern that appears to be superimposed on the lines.
In MRI, the appearance of moiré fringes can be caused by a variety of reasons e.g., inhomogeneity of the main magnetic field caused by a defect shielding (interference with RF pulses), interferences produced by aliasing, and interferences of echoes from different excitation modes (with different echo times).

Take spin echo-based techniques, or a surface coil. This artifact is often sensitive to shimming or susceptibility gradients.