Amyotrophic lateral sclerosis (ALS) is a disabling and rapidly progressive neurodegenerative disorder. There is no treatment that significantly slows progression. Increasing age is an important risk factor for developing ALS; thus, the societal impact of this devastating disease will become more profound as the population ages. A significant hurdle to finding effective treatment has been an inability to accurately measure brain degeneration in humans. Advanced magnetic resonance imaging (MRI) techniques hold promise in this respect, and may assist in aiding diagnosis and the efficient testing of new drugs.