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Voxel
 
A voxel is a volume element (volumetric and pixel) representing a value in the three dimensional space, corresponding to a pixel for a given slice thickness. Voxels are frequently used in the visualization and analysis of medical data. The Magnetic Resonance Imaging MRI pixel intensity is proportional to the signal intensity of the appropriate voxel.
See also Volumetric Imaging.
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Further Reading:
  Basics:
Magnetic Resonance Imaging, History & Introduction
2000   by www.cis.rit.edu    
Voxel-based structural magnetic resonance imaging (MRI) study of patients with early onset schizophrenia
Monday, 22 December 2008   by 7thspace.com    
  News & More:
Quantity, not just quality, in new Stanford brain scan method
Monday, 4 November 2013   by news.stanford.edu    
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Voxel Bleeding
 
Indicates cross talk of signal intensity from one voxel to an adjacent voxel in spectroscopic imaging. Up to 10% of a signal can appear in an adjacent voxel. These artifacts can be reduced by the Hanning filter.
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MRI Resources 
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Isotropic Voxel
 
A voxel that is uniform in all directions.
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Further Reading:
  News & More:
Voxel-based structural magnetic resonance imaging (MRI) study of patients with early onset schizophrenia
Monday, 22 December 2008   by 7thspace.com    
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Intravoxel Incoherent Motion
 
(IVIM) Spins moving in fluids with different velocities and possibly in different directions. This is being found to a small degree in all tissues as a result of capillary perfusion or diffusion. Important velocity changes occur as one moves from the vessel wall towards the center of the vessel. Hence, spins (to a variable degree) have different velocities within a single imaging voxel.
This effect can be measured using special pulse sequences such as in diffusion imaging or diffusion weighed imaging. When the velocity differences are marked, as occurs in larger blood vessels, effects due to IVIM are visible in standard MR images and give rise to flow related dephasing. The effects are more visible when longer echo times are used.
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Further Reading:
  Basics:
Diffusion Imaging: From Basic Physics to Practical Imaging
1999   by ej.rsna.org    
  News & More:
EVALUATION OF HUMAN STROKE BY MR IMAGING
2000
Technical Assessment of Artifact Production from Neuro Endovascular Coil At 3 Tesla MRI: An In Vitro Study
2012   by www.tmps.or.th    
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Partial Volume EffectInfoSheet: - Artifacts - 
Case Studies, 
Reduction Index, 
etc.
 
The partial volume effect is the loss of contrast between two adjacent tissues in an image caused by insufficient resolution so that more than one tissue type occupies the same voxel (or pixel). That may induce a partial volume artifact, dependent on the size of the image voxel. If fat and water spins occupy the same voxel, their signals interfere destructively. A small amount of water signal may be eliminated by a larger lipid signal from the same voxel, resulting in a voxel that appears to contain only lipid. The partial volume effect is minimal with thin slice thickness and sufficiently high resolution, so that fat and water or other different structures are unlikely to occupy the same voxel.


Image Guidance
Take thinner slices, and higher resolution (smaller voxel), but remain this may result in poorer signal to noise ratio in the image.
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MRI Resources 
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