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Brain lesions: when should fluid-attenuated inversion-recovery sequences be used in MR evaluation?
T Okuda1, Y Korogi, Y Shigematsu
1Department of Radiology, Kumamoto University School of Medicine, Japan.
Radiology
|September 9, 1999
Summary
Fluid-attenuated inversion-recovery (FLAIR) and intermediate-weighted MRI sequences offer comparable lesion detection. However, intermediate-weighted sequences are preferred for multiple sclerosis (MS) evaluation due to fewer artifacts and better visualization of certain lesions.
Area of Science:
- Radiology
- Neuroimaging
Background:
- Magnetic resonance (MR) imaging is crucial for detecting brain lesions.
- Fluid-attenuated inversion-recovery (FLAIR) and intermediate-weighted sequences are commonly used MR techniques.
Purpose of the Study:
- To compare the qualitative and quantitative contrast of brain lesions detected using FLAIR and intermediate-weighted MR imaging sequences.
Main Methods:
- Prospective study of 47 patients with suspected brain lesions.
- MR imaging performed using FLAIR, intermediate-weighted, and T2-weighted sequences.
- Qualitative assessment of lesion conspicuity, detection, artifacts, and clinical information; quantitative contrast and contrast-to-noise ratio (CNR) calculations.
Main Results:
- FLAIR and intermediate-weighted sequences showed similar lesion conspicuity and detection rates.
- FLAIR sequences exhibited significantly higher lesion-to-background contrast but also more image artifacts.
- FLAIR sequences failed to detect multiple sclerosis (MS) plaques in the basal ganglia and brain stem.
Conclusions:
- FLAIR sequences offer some additional information but no distinct advantages over intermediate-weighted sequences.
- Intermediate-weighted sequences are preferable for evaluating MS cases.
- Either FLAIR or intermediate-weighted sequences, in addition to T2-weighted sequences, are recommended for general brain lesion detection in MR imaging, except for MS cases.