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[Usefulness of selective partial inversion recover (SPIR) sequences in optic nerve diseases]
A Pierallini1, M C Piattella, N S Polli
1Dipartimento di Scienze Neurologiche, Università La Sapienza, Roma. pierallini@AXRMA.UNIROMA1.IT
La Radiologia Medica
|July 22, 1999
Summary
Fat-suppressed SPIR MRI sequences enhance the detection and characterization of optic nerve lesions, improving diagnostic accuracy for conditions like optic neuritis. This technique offers better anatomical definition for optic nerve imaging.
Area of Science:
- Neuroradiology
- Ophthalmology
- Medical Imaging
Background:
- Optic nerve lesions require accurate diagnosis for effective management.
- Conventional MRI sequences may have limitations in visualizing subtle optic nerve abnormalities.
Purpose of the Study:
- To evaluate the diagnostic yield of fat-suppressed SPIR (Spectral Presaturation with Inversion Recovery) sequences in identifying optic nerve lesions.
- To assess the effectiveness of SPIR sequences in improving anatomical definition and lesion characterization.
Main Methods:
- Ten patients with suspected optic nerve involvement underwent MRI using a 1.5 T unit.
- T1- and T2-weighted SPIR sequences with fat suppression were utilized.
- Axial, coronal, and parasagittal reconstructions were performed, including volumetric acquisitions.
- Contrast-enhanced sequences were also acquired.
Main Results:
- T2-weighted SPIR images detected optic nerve lesions consistent with neuritis in 4 out of 10 patients.
- No abnormalities were seen on T1-weighted images; contrast enhancement was noted in only one case.
- MRI identified a pilocytic astrocytoma in one patient and optic nerve atrophy in another.
Conclusions:
- Fat-suppressed SPIR MRI sequences significantly improve anatomical definition for optic nerve imaging.
- These sequences enhance lesion detection and characterization in various optic nerve conditions.
- SPIR imaging is a valuable tool for diagnosing optic nerve pathologies.