MS can be debilitating. Scientists have developed a way to measure the severity of a patient's multiple sclerosis and gauge how well drugs are working.
The researchers at New York University hope it will improve both diagnosis and treatment of the disease.
The technique measures the amount of a key chemical that is found in lower quantity than usual in the brain cells of MS patients.
Mike O'Donovan, chief executive of the MS Society, said: "This is an encouraging addition to the growing range of magnetic resonance measuring techniques which are helping to develop and monitor new treatments for this dreadful disease."
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