Qualitative comparison of 3-T and 1.5-T MRI in the evaluation of epilepsy

AJR. American Journal of Roentgenology
Pramit M PhalBronwyn E Hamilton

Abstract

MRI at 3 T, which has a higher signal-to-noise ratio than 1.5-T MRI, is potentially more sensitive and specific at delineating epileptogenic lesions and may influence management of refractory epilepsy. The purposes of the current study were to compare image quality of 3-T MRI with that of 1.5-T MRI in the evaluation of epilepsy and, in cases of focal epilepsy, to compare the two field strengths in terms of lesion detection and characterization. Retrospective review was performed on 50 sets of MR images of 25 patients who underwent both 3-T and 1.5-T brain imaging with a dedicated epilepsy protocol, including fast spin-echo T2-weighted, coronal FLAIR, coronal fast multiplanar inversion recovery, and 3D spoiled gradient-recalled echo pulse sequences. Parameters assessed were distortion and artifact, lesion conspicuity, gray-white matter differentiation, and motion. Each pulse sequence was graded on a 4-point scale. Reviewers performed qualitative assessments of the site of abnormality and the most likely diagnosis. MRI at 3 T outperformed MRI at 1.5 T in all four parameters and was statistically superior (p < 0.05) to 1.5-T MRI in all categories except motion. On 3-T MRI, lesions were detected in 65 of 74 cases compared with 55 o...Continue Reading

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