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Comparison between 7 Tesla and 3 Tesla MRI for characterizing orbital lesions - 31/08/22

Doi : 10.1016/j.diii.2022.03.007 
Augustin Lecler a, b, , Loïc Duron a, Emily Charlson c, Clint Kolseth c, Andrea L. Kossler c, Max Wintermark d, Kevin Moulin e, Brian Rutt e
a Department of Neuroradiology, Foundation Adolphe de Rothschild Hospital, 75019 Paris, France 
b Université Paris Cité, Faculté de Médecine, 75006 Paris, France 
c Department of Ophthalmology, Byers Eye Institute, Stanford Hospital, 94305 Stanford, CA, USA 
d Department of Neuroradiology, Stanford Hospital, 94305 Stanford, CA, USA 
e Lucas Center for Imaging, 94305 Stanford, CA, USA 

Corresponding author.

Highlights

7 T MRI yields better conspicuity and delineation of orbital lesions as compared to 3 T MRI.
Details of internal structures of orbital lesions are better assessed using 7 T MRI than with 3 T MRI.
Distortion and susceptibility artifacts surrounding orbital lesions are more frequent at 7 T MRI as compared to 3 T MRI.

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ABSTRACT

Purpose

Characterizing orbital lesions remains challenging with imaging. The purpose of this study was to compare 3 Tesla (T) to 7 T magnetic resonance imaging (MRI) for characterizing orbital lesions.

Materials and methods

This prospective single-center study enrolled participants presenting with orbital lesions from May to October 2019, who underwent both 7 T and 3 T MRI examinations. Two neuroradiologists, blinded to all data, read both datasets independently and randomly. They assessed general characteristics of each orbital lesion as well as image quality and presence of artifacts. Comparison between both datasets was made using Fisher exact test.

Results

Seven patients (4 women, 3 men) with a median age of 52 years were enrolled. Orbital lesion conspicuity was better scored at 7 T compared to 3 T MRI, with 3/7 lesions (43%) scored as very conspicuous at 7 T compared to 0/7 lesion (0%) at 3 T, although the difference was not significant (P = 0.16). Delineation of lesion margins was better scored at 7 T compared to 3 T with 3/7 lesions (43%) scored as very well delineated on 7 T compared to 0/7 lesions (0%) at 3 T, although the difference was not significant (P = 0.34). Details of internal structure were better assessed at 7 T compared to 3 T, with 4/7 lesions (57%) displaying numerous internal details compared to 0/7 lesions (0%) at 3 T (P = 0.10). Internal microvessels were visible in 3/7 lesions (43%) at 7 T compared to 0/7 lesions (0%) at 3 T (P = 0.19).

Conclusion

Although no significant differences were found between 7 T and 3 T MRI, assumably due to a limited number of patients, our study suggests that 7 Tesla MRI might help improve the characterization of orbital lesions. However, further studies with more patients are needed.

Le texte complet de cet article est disponible en PDF.

Keywords : Artifacts, Magnetic resonance imaging, Microvessels, Orbital neoplasms, Orbit

Abbreviations : MRI, WI, SD, IQR


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© 2022  Société française de radiologie. Publié par Elsevier Masson SAS. Tous droits réservés.
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Vol 103 - N° 9

P. 433-439 - septembre 2022 Retour au numéro
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