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Preface Neuroimaging techniques play a pivotal role in the research and clinical landscape of Parkinson’s and related disorders by helping to understand biological signatures of the disease, to aid the diagnosis, disease moni- toring, and pursuit for new therapeutic targets and novel drug development. The past 20 years has seen a rapid evolution of technological advances that has led to prompt developments in brain imaging techniques such as with magnetic resonance imaging (MRI), position emission tomogra- phy (PET), and single photon emission computed tomography (SPECT). Both academia and industry are increasingly employing neuroimaging tools to study changes within the brain which occur during disease states while using neuroimaging as markers and outcome endpoints in clinical trials. This book discusses the advances, and applications, of molecular, structural, and functional neuroimaging techniques in Par- kinson’s and related disorders. This book captures the fundamental principles of neu- roimaging techniques such with MRI, PET, and SPECT, and attempts to review the les- sons learnt from these neuroimaging studies and their correspondence in the clinical presentation of patients with Parkinson’s disease and related disorders including those with Lewy body dementias, atypical parkinsonism, Huntington’s disease, essential tremor, restless legs syndrome, dystonia, and demyelinating syndromes. Key features of this book include reviewing the biomarker value of neuro- imaging of the brain to understand disease pathophysiology, aetiology, and progres- sion in vivo in patients with Parkinson’s disease and related disorders, as well as the association between symptomatology and molecular, structural, functional changes, and the application of neuroimaging in drug development and clinical trials. The content offers a comprehensive overview and resource for neurologists, neuroscien- tists, neuroimagers, movement disorder specialists, and nuclear medicine pro- fessionals as well as students, teaching staff, basic and clinical scientists working on translational research, and across all levels of industry, including proof-of-concept, drug discovery, and clinical trials. The Edi- tors wish to express their sincere gratitude to all the contributing authors and hope that readers find these articles informative, engaging, and helpful in their practices. Marios Politis MD, MSc, DIC, PhD, FRCP, FEAN Neurodegeneration Imaging Group and Mireille Gillings Neuroimaging Centre, University of Exeter, London, United Kingdom xiii Preface