Welcome To MVHS Merrimack Valley Health Services, Inc. Your Neighborhood MRI Provider... Providing state-of-the-art, patient-friendly Magnetic Resonance Imaging (MRI) Services to Merrimack Valley. Merrimack Valley Health Services, Inc. is a four-hospital not-for-profit consortium providing state-of-the-art Magnetic Resonance Imaging (MRI) services utilizing a wide-diameter MRISM unit ...