The Essential MRI Patient Monitor is designed to assist clinicians in monitoring patient vital signs in the dynamic magnetic resonance environment. The device monitors pulse oximetry, pulse rate, and perfusion index in an MRI system room and in close proximity to the scanner magnet. The Essential combines touch screen convenience, wireless communication, radio frequency (RF) shielding, and digital signal processing (DSP) to address the challenges associated with patient monitoring in the MR environment. The Essential provides accurate, continuous, and reliable performance during MRI applications in a cost-efficient package before, during and after active scanning. The Essential MRI Patient Monitoring System consists of the following primary component