ONS has two MRI centers:

  • The ONS MRI Center in Greenwich is located at the Greenwich office at 6 Greenwich Office Park.

  • The ONS Stamford MRI Center is located on the Ground Level at the Stamford office at 5 High Ridge Park.

    Both ONS MRIs are MAGNETOM Aera, 70 cm 1.5T systems which use the latest technology to provide patients with a faster and more comfortable MRI exam.  With a wide bore design to help alleviate that “closed-in” feeling, the state-of-the-art units feature a powerful magnet that provides the highest-quality images — so your doctor can have full confidence in the diagnostic results.

ONS MRIs are evaluated by a Board-Certified Radiologist

All ONS MRI scans are evaluated by a Board-certified radiologist who will digitally transfer a complete report and the images to your physician, who can review the results with you during your office visit.  ONS MRIs are fully-accredited by The American College of Radiology.

PACs access for physicians


Prior to your appointment, please download and complete the MRI Safety Screening Form and bring it with you to your appointment.

MRI No-Show / Cancellation Policy

ONS strives to provide each patient with the highest quality of care while attempting to accommodate your schedule. We realize that emergencies and other scheduling conflicts arise and are sometimes unavoidable. However, advance notification allows us to offer your time to another patient who is in need of services.

1) ONS MRI patients must provide a minimum of 24 hours’ notice to change or cancel an appointment. Patients who do not arrive for a scheduled appointment or provide adequate notice will be charged a $100 cancellation fee. This charge cannot be billed to insurance and must be paid in order to reschedule your appointment.

2) Repeated failure to comply with this policy will result in your name being placed on a “Schedule Based on Availability” list. This will require you to call for appointment availability each day and our staff will do what they can to accommodate you as space on the schedule allows.

MRI FAQ (Frequently Asked Questions)

What is Magnetic Resonance Imaging (MRI)?

MRI technology that allows your doctor to look at your internal anatomy. No ionizing radiation is involved, but rather, a very safe but powerful magnetic field with radio waves.

What can I expect during my exam?

MRI makes a lot of noise. We provide music or ear plugs for your comfort. The approximate time will be anywhere from 25-45 minutes. Our scanner is short bore, so it is wider and shorter than most MRI machines, to make your experience better.

The scanner is wide open on both ends, well-lit and ventilated throughout. A microphone is built into the scanner so we can hear you at all times. We will also be providing a call button to hold that lets us know if you need assistance.

How should I dress for my MRI?

Please wear comfortable clothing without snaps, metal objects or zippers. You will be asked to put on a hospital gown during the exam. A locker will be provided for your belongings.