Extraocular muscle sampled volume in Graves' orbitopathy using 3-T fast spin-echo MRI with iterative decomposition of water and fat sequences

Acta Radiologica Open
Ludovico M GarauGiuseppe Panzironi

Abstract

Current magnetic resonance imaging (MRI) techniques for measuring extraocular muscle (EOM) volume enlargement are not ideally suited for routine follow-up of Graves' ophthalmopathy (GO) because the difficulty of segmenting the muscles at the tendon insertion complicates and lengthens the study protocol. To measure the EOM sampled volume (SV) and assess its correlation with proptosis. A total of 37 patients with newly diagnosed GO underwent 3-T MRI scanning with iterative decomposition of water and fat (IDEAL) sequences with and without contrast enhancement. In each patient, the three largest contiguous coronal cross-sectional areas (CSA) on the EOM slices were segmented using a polygon selection tool and then summed to compute the EOM-SV. Proptosis was evaluated with the Hertel index (HI). The relationships between the HI value and EOM-SV and between HI and EOM-CSA were compared and assessed with Pearson's correlation coefficient and the univariate regression coefficient. Inter-observer and intra-observer variability were calculated. HI showed a stronger correlation with EOM-SV (P < 0.001; r = 0.712, r2 = 0.507) than with EOM-CSA (P < 0.001; r = 0.645 and r2 = 0.329). The intraclass correlation coefficient indicated that the in...Continue Reading

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Citations

Feb 13, 2019·Neuroradiology·Stefan WeidauerElke Hattingen
Sep 16, 2020·Orthopaedic Surgery·Xiao-Jing GeDeng-Xing Lun
Oct 14, 2021·European Radiology·Mengsha ZouZhiyun Yang

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Methods Mentioned

BETA
imaging technique

Software Mentioned

SPSS
ImageJ
IDEAL
INFINITT

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