Advances in technology have led to greater sensitivity in imaging techniques, increasing scientists' ability to see into the brain and spinal cord. Now, a research team reports that a technique called magnetic resonance spectroscopic imaging (MRSI) can distinguish people with amyotrophic lateral sclerosis (ALS) from people without the disease.
When enhanced by a processing component called MIDAS (Metabolite Imaging and Data Analysis System), MRSI is able to detect the presence of small molecules called metabolites in the brain, including one called n-acetyl aspartate (NAA), which is produced by healthy motor neurons (the muscle-controlling nerve cells that are lost in ALS). NAA levels in the brain may be a biomarker— a reliable biological indicator — of the presence and progression of ALS.
The researchers determined NAA levels in the brains of 16 people with ALS, three with a related disease called primary lateral sclerosis (PLS), and 14 unaffected controls. They found:
The results, the investigators wrote, require validation in larger studies.
Reliable indicators of disease presence and progression (biomarkers) could help speed ALS diagnosis and provide trustworthy indicators about the treatment effects of experimental therapies in ALS clinical trials.
The research team published its findings online Feb. 12, 2013, in Neurology. Read the full report, for a fee: Whole-Brain Magnetic Resonance Spectroscopic Imaging Measures are Related to Disability in ALS.