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    Stokes Laboratory

    Ashley Stokes, PhD

    Radiographic assessment is a critical aspect of patient management for many pathologies, including multiple sclerosis (MS), Alzheimer’s disease, brain tumors, and stroke. Conventional images are sensitive to downstream indicators of altered neurobiology but often lack specificity to the underlying neuropathological causes. More advanced imaging methods provide unique and complementary functional information that is directly related to pathophysiology and could have a significant clinical impact on diagnosis, prognosis, surveillance, and assessment of treatment response. Our research focuses on developing, validating, and translating advanced magnetic resonance (MR) image acquisition and analysis methods to noninvasively assess neurological diseases and disorders. These advanced imaging methods include methods to interrogate vascular structure and function (dynamic susceptibility contrast and dynamic contrast enhanced MRI), cellular microstructure (diffusion-weighted and diffusion tensor imaging), protein content (chemical exchange saturation transfer), and hypoxia (using both MRI methods and PET radiotracers).

    Ongoing research projects in the Stokes Laboratory include the development of imaging biomarkers in Alzheimer’s disease, MS, and brain tumors. We also are interested in the neurological impact of hemodynamic insufficiencies. Previously, we developed and validated a new acquisition and analysis method for perfusion MRI to provide robust quantitative hemodynamic measures. This method has improved our understanding of tumor hemodynamics and provided insight into the tumor microenvironment (vasculature, morphology, function, etc.). Work is ongoing to characterize multi-scale perfusion metrics in patients with MS.

    Finally, we are working to establish advanced multi-parametric MR imaging signatures that may be indicative of early neuropathological changes in persons with normal aging, mild cognitive impairment, or Alzheimer’s disease. Our work in Alzheimer’s disease has also involved the preclinical development of an analogous set of MRI biomarkers that has allowed us to identify structural, vascular, metabolic, and molecular neuroimaging signatures in a triple transgenic mouse model of the disease.

    Volunteering

    We are accepting applications from motivated individuals who can commit to volunteering in the lab, but these spaces are limited. Volunteers in the Stokes Laboratory can expect to participate in a variety of research-related activities, including contribution to a research project. Please complete the application below if you are interested, and we will contact you.

    Laboratory Staff

    Lori Steffes
    Study Coordinator

    Ashley Nespodzany
    Research Staff

    Ashlyn Gonzalez
    Research Staff

    Contact Information

    Ashley Stokes, PhD
    Assistant Professor, Imaging Research
    Barrow Neurological Institute
    350 West Thomas Road
    Phoenix, Arizona 85013
    [email protected]

    About Barrow

    Since our doors opened as a regional specialty center in 1962, we have grown into one of the premier destinations in the world for neurology and neurosurgery. Our experienced, highly skilled, and comprehensive team of neurological specialists can provide you with a complete spectrum of care–from diagnosis through outpatient neurorehabilitation–under one roof. Barrow Neurological Institute: Discover. Educate. Heal.