Brain diffusion-weighted imaging in diabetic patients with retinopathy

Area of Science:

• Neuroimaging
• Diabetology
• Ophthalmology

Background:

• Diabetic retinopathy (DR) is a microvascular complication of diabetes mellitus.
• Brain involvement in diabetes is increasingly recognized, but specific changes related to DR require further investigation.

Purpose of the Study:

• To investigate changes in apparent diffusion coefficients (ADC) in various brain regions, particularly visual areas, in diabetic patients with retinopathy using diffusion-weighted imaging (DWI).

Main Methods:

• Conventional MRI and DWI of the brain were performed on 45 diabetic patients (categorized by DR severity) and 15 healthy controls.
• ADC values were measured in the visual cortex, cingulate gyrus, orbitofrontal cortex, and other frontal regions.

Main Results:

• Significantly increased ADC values were observed in the visual cortex, cingulate gyrus, and orbitofrontal cortex of diabetic patients with retinopathy compared to those without retinopathy and healthy controls.
• The visual cortex showed a further significant ADC increase in patients with proliferative DR compared to nonproliferative DR.
• Disease duration and HbA1c levels positively correlated with ADC values in these brain regions.

Conclusions:

• Increased ADC values in specific brain regions, especially the visual cortex, suggest neuronal loss in diabetic patients with retinopathy.
• These findings support a link between diabetic retinopathy and brain injury, highlighting the impact of diabetes on neurological health.