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MR imaging of orbital tumors with CT and ultrasound correlations
Abstract:
Fourteen patients with various orbital space-occupying lesions were studied by magnetic resonance (MR) imaging with a 0.15 T imager using spin-echo and inversion-recovery pulse sequences. Computed tomographic and ultrasonographic (US) examinations were done in 13 of these patients. All 14 lesions could be demonstrated by MR. Magnetic resonance was found to be better than US but not as good as CT in providing morphological details. Regarding tissue characterization, US was the most useful among the three modalities. With the T2-weighted spin-echo pulse sequence, a possible trend in tissue characterization could be shown. From our preliminary experience, we conclude that MR imaging using a 0.15 T resistive magnet offers no distinct advantage over the combination of CT and US in the diagnosis of orbital tumors.
Insights
Magnetic resonance (MR) imaging effectively detected orbital space-occupying lesions. However, it did not offer significant advantages over computed tomography (CT) and ultrasonography (US) for diagnosing orbital tumors.
Area of Science:
- Ophthalmology
- Radiology
- Medical Imaging
Background:
- Orbital space-occupying lesions require accurate diagnostic imaging.
- Magnetic resonance (MR) imaging is a valuable tool for evaluating orbital pathologies.
Purpose of the Study:
- To evaluate the diagnostic utility of low-field (0.15 T) MR imaging for orbital space-occupying lesions.
- To compare the performance of MR imaging with computed tomography (CT) and ultrasonography (US).
Main Methods:
- Fourteen patients with orbital lesions underwent MR imaging (0.15 T) using spin-echo and inversion-recovery sequences.
- Thirteen patients also had CT and US examinations.
- Lesion detection, morphological detail, and tissue characterization were assessed.
Main Results:
- MR imaging successfully demonstrated all 14 orbital lesions.
- CT provided superior morphological detail compared to MR and US.
- US offered the best tissue characterization among the three modalities; MR showed potential trends with T2-weighted sequences.
Conclusions:
- Low-field MR imaging (0.15 T) can detect orbital space-occupying lesions.
- The combination of CT and US is currently advantageous over low-field MR for comprehensive orbital tumor diagnosis.
- Further research may explore advanced MR techniques for improved tissue characterization.