10388578

Source:http://linkedlifedata.com/resource/pubmed/id/10388578

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Predicate	Object
rdf:type	pubmed:Citation
lifeskim:mentions	umls-concept:C0079809, umls-concept:C0917874, umls-concept:C1537007, umls-concept:C1707455, umls-concept:C1710017
pubmed:issue	1
pubmed:dateCreated	2000-3-22
pubmed:abstractText	The tensors derived from diffusion tensor imaging describe complex diffusion in tissues. However, it is difficult to compare tensors directly or to produce images that contain all of the information of the tensor. Therefore, it is convenient to produce scalar measures that extract desired aspects of the tensor. These measures map the three-dimensional eigenvalues of the diffusion tensor into scalar values. The measures impose an order on eigenvalue space. Many invariant scalar measures have been introduced in the literature. In the present manuscript, a general approach for producing invariant scalar measures is introduced. Because it is often difficult to determine in clinical practice which of the many measures is best to apply to a given situation, two formalisms are introduced for the presentation, definition, and comparison of measures applied to eigenvalues: (1) normalized eigenvalue space, and (2) parametric eigenvalue transformation plots. All of the anisotropy information contained in the three eigenvalues can be retained and displayed in a two-dimensional plot, the normalized eigenvalue plot. An example is given of how to determine the best measure to use for a given situation by superimposing isometric contour lines from various anisotropy measures on plots of actual measured eigenvalue data points. Parametric eigenvalue transformation plots allow comparison of how different measures impose order on normalized eigenvalue space to determine whether the measures are equivalent and how the measures differ. These formalisms facilitate the comparison of scalar invariant measures for diffusion tensor imaging. Normalized eigenvalue space allows presentation of eigenvalue anisotropy information.
pubmed:language	eng
pubmed:journal	http://linkedlifedata.com/resource/pubmed/journal/9707935
pubmed:citationSubset	IM
pubmed:status	MEDLINE
pubmed:month	Jul
pubmed:issn	1090-7807
pubmed:author	pubmed-author:BahnM MMM
pubmed:copyrightInfo	Copyright 1999 Academic Press.
pubmed:issnType	Print
pubmed:volume	139
pubmed:owner	NLM
pubmed:authorsComplete	Y
pubmed:pagination	1-7
pubmed:dateRevised	2006-11-15
pubmed:meshHeading	pubmed-meshheading:10388578-Anisotropy, pubmed-meshheading:10388578-Diffusion, pubmed-meshheading:10388578-Magnetic Resonance Imaging
pubmed:year	1999
pubmed:articleTitle	Comparison of scalar measures used in magnetic resonance diffusion tensor imaging.
pubmed:affiliation	Mallinckrodt Institute of Radiology, Washington University School of Medicine, 510 South Kingshighway Boulevard, St. Louis, Missouri 63110, USA.
pubmed:publicationType	Journal Article, Comparative Study