# Advanced MRI technique reveals cellular damage in Huntington's disease New brain scan tool could help track treatment effectiveness for genetic disorder - **Source:** [Scientific American Content: Global](https://brifing.si/source/4f066134-e06d-4415-87ef-305e3dc2aba6) - **Published:** 2026-09-05 - **Original article:** - **On Brifing:** https://brifing.si/s/d865139f-104b-4ea0-8550-a49eac542300 ## Huntington's disease impact Huntington's is a genetic disorder affecting 8,000 people in the UK, progressively impairing movement, cognition and mood. The disease causes neuronal loss in the striatum, part of the brain's basal ganglia responsible for motor control. Conventional MRI shows tissue shrinkage but can't reveal cellular-level changes. Current treatments focus on symptom management as no cure exists, though new gene therapies are in development. ## Sandi MRI innovation Researchers developed Soma and Neurite Density Imaging (Sandi) to analyze diffusion MRI scans. This technique measures water movement through brain tissue to estimate cell properties like size and density. The method provides indirect measurements of cellular changes previously only observable in postmortem studies. Sandi offers the first non-invasive way to monitor living brain tissue at cellular resolution. ## Clinical study findings The study compared 56 Huntington's patients with 57 healthy controls using strong-gradient MRI scanners. In patients' basal ganglia, Sandi detected lower cell-body density, larger cell size and increased intercellular space - matching postmortem findings. These changes correlated with disease severity and poor performance on motor tests. The thalamus showed no such abnormalities, confirming disease-specific patterns. ## Biological insights Sandi appears to capture Huntington's hallmark neuronal loss and glial cell changes. As neurons die, supporting glial cells enlarge and become hyperactive, altering the brain's cellular environment. In some striatal regions, Sandi measurements combined with age explained 63% of observed tissue shrinkage. This suggests the technique detects biological drivers of neurodegeneration. ## Therapeutic applications The method could revolutionize treatment monitoring for experimental Huntington's therapies. Current trials lack ways to verify if treatments actually protect brain cells in living patients. Sandi might enable researchers to track cellular responses to gene therapies non-invasively. This could accelerate development of effective interventions by providing quantitative treatment biomarkers. ## Study limitations The current research represents a single-timepoint comparison, not longitudinal tracking. Researchers must still validate whether Sandi can reliably measure disease progression or treatment effects over time. Additional studies are needed to adapt the technique for standard hospital MRI scanners. Larger patient cohorts will be required to establish clinical utility across disease stages. ## Broader implications Beyond Huntington's, Sandi could apply to other neurodegenerative diseases sharing cellular loss patterns, like Parkinson's and Alzheimer's. The technique offers a new window into living brain pathology that could transform neurology research. By moving beyond gross structural measurements, it enables investigation of cellular mechanisms driving various brain disorders. ## Future research directions Next steps include longitudinal studies tracking Sandi measurements throughout Huntington's progression. Researchers must determine optimal scanning protocols and establish sensitivity thresholds for detecting treatment effects. If validated, Sandi could become a standard tool for clinical trials and eventually routine patient monitoring, potentially enabling personalized treatment approaches. ## Sources covering this story - https://www.scientificamerican.com/article/new-brain-scan-tool-could-help-treat-huntingtons-disease-a-devastating-genetic-condition/ — --- _Summary written by Brifing from the original reporting. Copyright in the original article belongs to its publisher; read the full piece at the link above._