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Three-dimensional fast fluid attenuated inversion recovery (3D fast FLAIR): a new MRI sequence which increases the
N Tubridy1, G J Barker, D G Macmanus
1NMR Research Unit, Institute of Neurology, London, UK.
Abstract:
Two-dimensional (2D) fluid attenuated inversion recovery (FLAIR) magnetic resonance imaging is superior to T2 weighted conventional spin echo (CSE), in certain areas of the brain but not in others, in detecting the lesions of multiple sclerosis (MS). The present study evaluates the ability of a recently developed three-dimensional fast FLAIR (3D fast FLAIR) sequence in detecting and quantifying the brain lesions of multiple sclerosis. The lesion volumes measured on the 3D fast FLAIR sequence with 1.5 mm thick slices were compared with those obtained from CSE brain images with 5 mm thick slices. The findings seen in 3D fast FLAIR brain images in 10 normal control subjects are also described. 3D fast FLAIR images showed an overall increase of 34% in lesion volume compared with CSE. The increase was most marked in the periventricular and "discrete" areas of the cerebral hemispheres. Lesion volumes seen in the subcortical areas were similar in both sequences. The CSE images displayed higher lesion volumes in the posterior cranial fossa. It is concluded that 3D fast FLAIR is a promising technique for quantifying cerebral pathology in MS which is not accessible to 2D CSE.
Insights
Three-dimensional fast FLAIR (3D fast FLAIR) MRI significantly improves detection and quantification of multiple sclerosis (MS) brain lesions compared to conventional spin echo (CSE) techniques. This advanced imaging method offers better visualization of MS pathology, especially in challenging brain regions.
Area of Science:
- Neurology
- Radiology
- Medical Imaging
Background:
- Two-dimensional FLAIR (2D FLAIR) MRI shows variable efficacy in detecting multiple sclerosis (MS) lesions compared to conventional spin echo (CSE) T2-weighted imaging.
- Accurate detection and quantification of MS brain lesions are crucial for disease monitoring and management.
Purpose of the Study:
- To evaluate the efficacy of a novel three-dimensional fast FLAIR (3D fast FLAIR) sequence in detecting and quantifying MS brain lesions.
- To compare lesion volumes measured by 3D fast FLAIR with those from conventional spin echo (CSE) imaging.
Main Methods:
- Comparison of lesion volumes obtained from 3D fast FLAIR (1.5 mm slices) and CSE (5 mm slices) brain images in MS patients.
- Inclusion of findings from 3D fast FLAIR images in 10 normal control subjects to describe normal anatomical variations.
Main Results:
- 3D fast FLAIR demonstrated a 34% overall increase in lesion volume compared to CSE.
- The most significant increases in lesion volume were observed in periventricular and discrete cerebral hemisphere areas.
- Lesion volumes in subcortical areas were comparable between sequences, while CSE showed higher volumes in the posterior cranial fossa.
Conclusions:
- 3D fast FLAIR is a highly promising technique for accurately quantifying cerebral MS pathology.
- This advanced MRI sequence can detect MS lesions in areas not visualized by conventional 2D CSE techniques.