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[[File:Gliomatosis cerebri2.jpg|thumb|Axial fluid-attenuated inversion recovery MRI image demonstrating tumor-related infiltration involving lenticular nuclei (Arrow).]]
[[File:Gliomatosis cerebri.jpg|thumb|Axial fluid-attenuated inversion recovery MRI image demonstrating tumor-related infiltration involving both temporal lobes (Short arrow), and the substantia nigra (Long arrow).]]
'''Fluid attenuated inversion recovery''' (FLAIR) is a [[pulse sequence]] used in [[magnetic resonance imaging]] which was invented by Dr. [[Graeme Bydder]]. FLAIR can be used with both three dimensional imaging ('''3D FLAIR''') or two dimensional imaging ('''2D FLAIR''').
 
The pulse sequence is an [[inversion recovery]] technique that nulls fluids. For example, it can be used in brain imaging to suppress [[cerebrospinal fluid]] (CSF) effects on the image, so as to bring out the periventricular hyperintense lesions, such as [[multiple sclerosis]] (MS) plaques.<ref>Bakshi R, Ariyaratana S, Benedict RH, Jacobs L. Fluid-attenuated inversion recovery magnetic resonance imaging detects cortical and juxtacortical multiple sclerosis lesions PMID 11346369</ref>
 
By carefully choosing the inversion time (TI), the signal from any particular tissue can be nulled. The appropriate TI depends on the tissue via the formula:
 
:<math>\textrm{TI} = \ln(2) \cdot T_1,\,</math>
 
in other words, one should typically use a TI of around 70% of the [[Spin-lattice relaxation time|''T<sub>1</sub>'']] value. In the case of CSF suppression, one aims for [[Spin-spin relaxation time|''T<sub>2</sub>'']] weighted images.
 
==See also==
*[[Relaxation (NMR)]]
 
==Further reading==
 
*McRobbie D., et al. ''MRI, From picture to proton.'' 2003 p.40-42
*Hashemi Ray, et al. ''MRI, The Basics'' 2ED. 2004. p.272
 
==References==
{{reflist}}
 
{{Science-stub}}
[[Category:Magnetic resonance imaging]]

Revision as of 16:06, 20 April 2013

Axial fluid-attenuated inversion recovery MRI image demonstrating tumor-related infiltration involving lenticular nuclei (Arrow).
Axial fluid-attenuated inversion recovery MRI image demonstrating tumor-related infiltration involving both temporal lobes (Short arrow), and the substantia nigra (Long arrow).

Fluid attenuated inversion recovery (FLAIR) is a pulse sequence used in magnetic resonance imaging which was invented by Dr. Graeme Bydder. FLAIR can be used with both three dimensional imaging (3D FLAIR) or two dimensional imaging (2D FLAIR).

The pulse sequence is an inversion recovery technique that nulls fluids. For example, it can be used in brain imaging to suppress cerebrospinal fluid (CSF) effects on the image, so as to bring out the periventricular hyperintense lesions, such as multiple sclerosis (MS) plaques.[1]

By carefully choosing the inversion time (TI), the signal from any particular tissue can be nulled. The appropriate TI depends on the tissue via the formula:

TI=ln(2)T1,

in other words, one should typically use a TI of around 70% of the T1 value. In the case of CSF suppression, one aims for T2 weighted images.

See also

Further reading

  • McRobbie D., et al. MRI, From picture to proton. 2003 p.40-42
  • Hashemi Ray, et al. MRI, The Basics 2ED. 2004. p.272

References

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  1. Bakshi R, Ariyaratana S, Benedict RH, Jacobs L. Fluid-attenuated inversion recovery magnetic resonance imaging detects cortical and juxtacortical multiple sclerosis lesions PMID 11346369