Wentworth-Douglass Hospital
(603) 742-5252
Decrease (-) Restore Default Increase (+) font size
Physicians
CT or CAT Scan
Ultrasound
X-rays and Fluoroscopic Procedures
Nuclear Medicine
MRI
PET

MRI

What is MRI?

Magnetic Resonance Imaging (MRI) is a noninvasive medical test that helps physicians diagnose and treat medical conditions. MRI uses a very strong magnetic field and radio waves to create images of the body. The hydrogen atoms in the body react to the magnetic field and emit signals that are analyzed by a computer to produce images. 

MRI does not use ionizing radiation (x-rays).

Why MRI?
MRI reveals more details than other imaging modalities and is able to differentiate between healthy and diseased tissue. It does not use any ionizing radiation and is painless with no known permanent side effects.

Detailed MR images allow physicians to better evaluate various parts of the body and certain diseases that may not be assessed adequately with other imaging methods such as x-ray, ultrasound or computed tomography (also called CT or CAT scanning). View our Commonly Ordered MRI Procedures and Their Indications.

Each exam can take from 20 minutes to 1 hour and is very motion sensitive. If a patient moves during the sequence scans, there is risk of distorting the images which may have to be repeated, thus making the procedure take more time.

Contrast Media:
Some MRI exams require the injection of contrast into the veins. This is to help better visualize the anatomy and will show more detail about that particular part of the body. MRI uses a different type of contrast which works differently than that in X-ray or CT. Contrast agents may be injected intravenously to enhance the appearance of blood vessels, tumors or inflammation. In addition, contrast agents may also be directly injected into a joint in the case of arthrograms, MR images of joints.

The blood filters out the contrast through the urinary system naturally, so it is crucial that the kidneys are functioning properly. For all patients receiving intravenous contrast and are 60 years of age or older; or diabetic and/or with known renal insufficiency/compromise creatinine levels/GFRs are required. Lab results must be within 30 days prior to the procedure. Patients currently receiving dialysis will not receive Gadodiamide (Omniscan) for MRI.

Safety Screenings:
The safety questionnaire must be filled out entirely and accurately.  This will ensure that the patient does not have anything in or on the body that could cause injury or problems during the MRI.  Because the Magnet is over 45,000 times stronger than the earth's magnetic field, safety screening is very important. 

As part of screening, a patient may be required to have an x-ray before an MRI to determine if there are any metal foreign objects in a particular area of anatomy prior to going into the magnet.  Most often, it is the orbits (eyeballs) that are imaged if a patient has a history of working with metal or has had metal removed from the eyes.  Please have this done prior to arriving for a scheduled MRI.

Please click the link below to print and complete the MRI Safety screening before your scheduled appointment. You may have your ordering physician’s office print this for you to complete during your office visit. Once the screener is completed by you, your physician’s office can fax it with your order to scheduling and WDH imaging services. This will save you time and reduce the amount of paperwork when you arrive for your appointment. Your technologist will review your screener form with you prior to your imaging study.****It is important to remember to bring the completed form with you to your appointment along with any literature or documentation regarding any implants or prostheses you may have.

Please empty pockets prior to the MRI, as metal object may become projectiles in the magnetic field.

Download & Print MRI Safety Questionnaire.

MRI FAQ's

MRI Glossary

Find What You Need

Events
Careers
Foundation
About Us
Contact
Directions
News
Social Media Agreement
Joint Notice
Web Privacy Policy
WDH Staff Portal

Centers & Services

Cancer Center
Cardiovascular Care
Joint Replacement
Women & Children's
Physician Offices
Other Services

Conditions & Treatments

Health Library

Support Services

Support Groups
Care-Van
Dental Center
Social Work
Food & Nutrition
Integrative Wellness
Spiritual Care
Concerns & Grievances
Homecare and Hospice

For Patients

Pay Your Bill Online
Pricing Estimates
Financial Assistance
Interpreter Services
Surgery Preparation
Medical Record Request
Advance Directives
Clinical Research & Trials

For Healthcare Professionals

Work and Life
Financial Well-Being
Career and Growth

The Wentworth-Douglass Health System includes:

 

Address

Wentworth-Douglass Hospital
789 Central Avenue, Dover, NH 03820
Phone: (603) 742-5252
Toll free: 1 (877) 201-7100