CT Scan

A CT scan produces a series of images that can detect many conditions that are not detectable with conventional x-rays.

CT scans are exams that involve lying on a table while a special x-ray machine produces cross-sectional images or pictures of the inside of the body. During the scan, an x-ray tube producing a thin beam of radiation moves around the area of your body being scanned while the table moves through the scanner. This produces multiple cross-sectional images which can be combined to create 3D images or images along different planes.

Appointments and Referrals

We are here to support you. You may reach us at 416-469-6401 (the main DI line) from 7:30 a.m. to 4 p.m.

If you require assistance outside of regular business hours, you may choose one of the following options:

  • Leave a voice mail message at 416-469-6401
  • Send us an email at @email

What to expect

There are two main types of CT exams - without intravenous (IV) contrast and with IV contrast.  CT-guided biopsies and procedures are also performed in the CT suite.

For ALL CT exams:  Please remove jewellery, hairpins and bobby pins before your exam.

CT studies WITHOUT IV contrast:  No other preparation is needed.

CT exams WITH IV contrast:

  1. Allergies:  If you have a history of allergic reaction to X-ray dye (IV contrast), you should notify your doctor to arrange for pre-medication. Please inform the Technologist and/or Nurse prior to your exam.
  2. Creatinine results required in certain cases:  If you are Diabetic, or over age 70, or have kidney issues, please ensure your doctor submits your Creatinine level within 3 months of your CT appointment and has faxed the results to the MGH DI booking office.
  3. Diabetes: If you are taking diabetic medications containing Metformin or Glucophage please consult your doctor as it should be withheld 48 hours AFTER the exam.
  4. Duration:  You should allow at least two to three hours for the appointment.
  5. Food:  You may have a light meal up to two hours prior to your appointment.  Nothing to eat or drink 2 hours prior.
  6. Medications:  Please take your medications as prescribed, regardless of your appointment time
  7. CT Enterography:  Clear fluids only for 4 hours prior to examination. You will need to arrive 1 hour 15 minutes prior to your appointment time to drink contrast. You will need to arrange for someone to take you home. You will need to stay in the department for at least 45 min after scan to be close to the bathroom
  8. Pregnant patients:  Tell your doctor if you are pregnant. Your doctor may recommend another type of exam.

CT-guided Biopsies and Procedures:  Your referring Specialist Physician will provide you with instructions for your specific procedure. If you have not received the instructions from your Specialist Physician, please call us at 416-469-6580, extension 2310.

CT Scan
Office Hours
8:00 am - 10:00 pm
Monday to Friday

8:30 am - 9:00 pm
416-469-6580 x2310
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