Related Experiment Video
Updated: Nov 16, 2025
07:44
In vivo Structural Assessments of Ocular Disease in Rodent Models using Optical Coherence Tomography
Published on: July 24, 2020
3.2K
Thyroid-Associated Ophthalmopathy: Preliminary Study Using T2 Mapping to Characterize Intraorbital Optic Nerve
Hao Hu1, Huan-Huan Chen2, Wen Chen1
1Department of Radiology, The First Affiliated Hospital of Nanjing Medical University, Nanjing, China.
Summary
T2 mapping detects optic nerve changes in thyroid-associated ophthalmopathy (TAO) before vision loss occurs. This MRI technique shows higher T2 relaxation times (T2RT) in the optic nerve of TAO patients, particularly active cases.
Area of Science:
- Ophthalmology
- Radiology
- Endocrinology
Background:
- Thyroid-associated ophthalmopathy (TAO) can lead to dysthyroid optic neuropathy (DON), causing vision loss.
- Early detection of optic nerve (ON) changes in TAO is crucial for timely intervention.
- Current methods for assessing ON involvement in TAO may not be sensitive enough to detect pre-clinical changes.
Purpose of the Study:
- To evaluate the efficacy of T2 mapping in identifying intraorbital optic nerve (ON) alterations in patients with TAO prior to the development of dysthyroid optic neuropathy (DON).
Main Methods:
- Magnetic resonance imaging (MRI) was used to measure T2 relaxation time (T2RT) in the intraorbital ON, extraocular muscles (EOMs), and orbital fat of 35 TAO patients (21 active, 14 inactive) and 21 healthy controls (HCs).
- Clinical variables, including exophthalmos and EOM thickness, were also assessed.
- Correlations between ON T2RT and other parameters were analyzed.
Main Results:
- Patients with TAO exhibited significantly elevated intraorbital ON T2RT compared to HCs (P < .001).
- Active TAO cases showed higher ON T2RT than inactive TAO and HCs (P < .001).
- ON T2RT correlated positively with disease activity and severity markers and negatively with visual acuity and visual field indices in active TAO.
Conclusions:
- T2 mapping can detect intraorbital ON disturbances in TAO patients, especially those with active disease, before DON onset.
- T2 mapping offers a promising noninvasive tool for evaluating ON changes in TAO.
