1. A method of detecting Parkinson's disease (PD) through operating a magnetic resonance imaging (MRI) apparatus performing MRI of brain tissue that includes substantia nigra pars compacts (SNc) tissue comprising: obtaining a gray matter suppressed (GMS) MRI signal of brain tissue that includes said SNc tissue by operating said MRI apparatus; obtaining a white matter suppressed (WMS) MRI signal of brain tissue that includes said SNc tissue by operating said MRI apparatus; processing information from said GMS and WMS MRI signals to produce and present resultant signals indicative of PD by computer-processing; and including forming and displaying, by computer processing, GMS and WMS images using information from said GMS and WMS signals.