Brain imaging in RBD.

Neuroimaging studies can provide in vivo insights to the early structural and functional brain changes in patients with idiopathic RBD (iRBD) and may help give a prognosis of disease course. This chapter summarizes the major findings of neuroimaging studies in iRBD, a specific prodromal stage of Parkinson’s disease (PD) and other α-synucleinopathies. Molecular imaging techniques, magnetic resonance imaging (MRI), and transcranial sonography (TCS) are all discussed