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Mn(III)TPPS4InfoSheet: - Contrast Agents - 
Intro, Overview, 
Characteristics, 
Types of, 
etc.
 
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.
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• View the DATABASE results for 'Mn(III)TPPS4' (2).Open this link in a new window

Modified Spin EchoInfoSheet: - Sequences -
Intro, Overview, 
Types of, 
etc.
 
(MSE) A spin echo technique with a flip angle over 90°.

See Spin Echo Sequence and Fast Spin Echo.
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MRI Resources 
Software - MRI Training Courses - Process Analysis - - Crystallography - Pregnancy
 
Modulation Transfer Function
 
(MTF) Mathematical procedure for measuring resolution.
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Modulus Image
 
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.
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Moire Fringes (Artifact)InfoSheet: - Artifacts -
Case Studies, 
Reduction Index, 
etc.MRI Resource Directory:
 - Artifacts -
 
Quick Overview
Artifact Information
NAME
Moire fringes, moire
DESCRIPTION
Superimposed signals of different phases
REASON
Interferences
HELP
Surface coil, shimming
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).
mri safety guidance
Image Guidance
Take spin echo-based techniques, or a surface coil. This artifact is often sensitive to shimming or susceptibility gradients.
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Further Reading:
  Basics:
MRI Artifact Gallery
   by chickscope.beckman.uiuc.edu    
Moiré pattern
   by en.wikipedia.org    
Moire Fringes
   by www.mritutor.org    
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