Diagnostic imaging

St. Mary’s provides comprehensive diagnostic imaging on an in-patient and out-patient basis. Over 70,000 examinations are performed each year. Our staff is committed to providing patients with a compassionate, caring environment with the latest in technology and innovation in medical imaging.

For your convenience, the Diagnostic Imaging department is located on the first floor of the hospital.

The department offers the following services:


Ultrasound examinations produce images of soft tissues and are traditionally associated with gynecologists and obstetricians providing examinations of pregnancies, with no danger to the unborn child. However, the majority of ultrasounds performed at St. Mary’s General Hospital are of the abdomen and pelvis. While Ultrasound is a powerful diagnostic tool, it also serves as a guidance system, to pinpoint the exact location of an organ for treatment or surgery.

Mammography and OBSP (Ontario Breast Screening Program)

*Please note that mammography services at St. Mary’s General Hospital are currently unavailable due to equipment challenges.

St. Mary’s will ensure that patients are redirected and managed with as little impact as possible. Patients requiring diagnostic mammography/ultrasound combination breast imaging, interventional procedures including needle localizations requiring mammographic guidance, will be managed at the Waterloo Wellington Breast Center at Grand River Hospital’s Freeport Campus, located at 3570 King St. East, Kitchener. Screening mammography, including Ontario Breast Screening (OBSP) requests will be given the option to redirect to the Waterloo Wellington Breast Centre as well.

We will work closely with physician offices to ensure patients who require localizations at the Waterloo Welling Breast Center, with surgery at St. Mary’s ,are coordinated seamlessly, just as the patients who must travel to the GRH site for surgery.

We will communicate updates as they are available.

Any questions regarding mammography can be answered by contacting 519-749-6635.

CT Scan

A CT Scan (Computerized Tomography), uses x-rays to provide two- or three dimensional images of your body. This is different from routine x-ray examinations which produce a flat planar image. Some scans require the administration of an intravenous contract medium called a “dye”.


Elective X-ray at St. Mary’s operates from 8:00 a.m. to 5:00 p.m. Monday to Friday. Outside of these hours, x-ray services at St. Mary’s are for emergency cases only.

For more information contact

Central Booking

*Please note: Urgent matters should not be communicated over email. Please call the Central Booking line.

Referring physicians can find patient referral information here.