Neuroimaging data such as magnetic resonance imaging (MRI), resting-state functional magnetic resonance imaging (rs-fMRI), single-photon emission tomography (SPECT), dopamine transporter imaging (DAT), 123I-ioflupane-SPECT (DaTscan), diffusion tensor imaging (DTI), positron emission tomography (PET), and computed tomography (CT) scans can be used to diagnose PD. This evidence concerns the gene SLC6A3 and Parkinson disease.