Dr. Mary-Louise Catherine Greer – Radiologist | Toronto, ON

Dr. Mary-Louise Catherine Greer, a respected Radiologist, is committed to accurate image interpretation and patient safety in all imaging procedures. Practicing at medical facilities in Toronto, ON, she supports various clinical departments and adheres to the standards set by the College of Physicians and Surgeons of Ontario (CPSO). She provides comprehensive services as a Radiologist, focusing on precise diagnosis and optimal patient care for individuals requiring diagnostic imaging or image-guided procedures.

Dr. Greer graduated with a Medical Degree from the University of Queensland Faculty of Medicine in 1989 (Australia). She has been practicing as a specialist Radiologist for over 6 years, since 2018. She is certified as a CPSO Recognized Specialist, demonstrating her expertise and adherence to professional standards.

Her clinical philosophy emphasizes diagnostic accuracy, patient safety, and continuous professional development. Dr. Greer is committed to delivering high-quality radiological services in Toronto, speaking English fluently. Her approach ensures that patients receive thorough and reliable imaging assessments to guide effective treatment decisions.

• Fluoroscopy Procedure Interpretation: Interpreting real-time X-ray imaging (fluoroscopy) used during procedures like barium studies (GI tract), hysterosalpingograms, or to guide certain injections.
• Mammography and Breast Imaging Interpretation: Expert review and reporting of mammograms (including tomosynthesis/3D mammography) and breast ultrasound for cancer screening, diagnosis, and follow-up.
• Magnetic Resonance Imaging (MRI) Interpretation: Specialized analysis and reporting of MRI scans, providing detailed images of soft tissues, brain, spine, joints, abdomen, and pelvis without using ionizing radiation.
• X-ray Interpretation (Radiography): Expert analysis and reporting of X-ray images for diagnosing conditions related to bones (fractures, arthritis), chest (pneumonia, lung nodules), and abdomen.
• Bone Densitometry (DEXA) Scan Interpretation: Analyzing DEXA scans to measure bone mineral density, assess osteoporosis risk, and monitor treatment effectiveness.

Note: This list provides an overview of common radiology services. Dr. Greer interprets a wide range of medical imaging studies and/or performs procedures as indicated by your referring physician. Specific subspecialty services depend on the physician's focus and training.

All medical imaging services are provided in accordance with the standards of practice set by the College of Physicians and Surgeons of Ontario (CPSO).

Dr. Greer's practice is primarily based at Mount Sinai Hospital, located in the Bay Street Corridor (Discovery District) neighborhood of Toronto. The location is conveniently situated near the Yorkville Shopping District and Hot Docs Ted Rogers Cinema. Patients can access the facility via TTC services, including subway, streetcar, and bus routes. The hospital features multiple transportation options, ensuring ease of access for all patients. The facility is wheelchair accessible. Parking is available at the facility.

Are imaging studies interpreted by Dr. Greer covered by Ontario Health Insurance Plan (OHIP) in ON?

Medically necessary diagnostic imaging studies interpreted by a Radiologist like Dr. Greer are typically covered by Ontario Health Insurance Plan (OHIP) in ON when prescribed by your referring physician and performed at an accredited medical facility. Some advanced or specialized interventional procedures may also be covered. It's always best to confirm specific coverage details with Ontario Health Insurance Plan (OHIP) or the imaging clinic/hospital.

Do I need a referral from my doctor to have an imaging study interpreted by Dr. Greer?

Yes, almost all diagnostic imaging tests (like X-rays, CT, MRI, ultrasounds) and interventional radiology procedures require a formal request or requisition from your family doctor, specialist, or other authorized healthcare provider. Dr. Greer provides expert interpretation of these physician-ordered studies.

Why might I need an injection of 'contrast' or 'dye' for my scan?

Contrast material (often called 'dye', though it's usually clear) is a special substance that can be injected intravenously (or sometimes taken orally or rectally) to help certain organs, blood vessels, or tissues stand out more clearly on imaging exams like CT or MRI. It can help Dr. Greer see abnormalities that might otherwise be hidden. Not all scans require contrast; it's used when it can provide important additional diagnostic information.

I'm concerned about radiation exposure. Are X-rays and CT scans safe?

Patient safety is our top priority. Radiologists and technologists are trained to use the lowest radiation dose necessary to obtain high-quality diagnostic images (this is known as the ALARA principle - As Low As Reasonably Achievable). While X-rays and CT scans do use ionizing radiation, the amount for most diagnostic exams is carefully controlled and the benefit of an accurate diagnosis generally far outweighs the very small potential risk. If you have specific concerns, please discuss them with your referring doctor or the imaging staff before your exam.

Is there general preparation needed before an imaging appointment?

Preparation varies significantly based on the type of imaging test. Some require fasting for several hours, others may need you to drink water for a full bladder, or avoid certain medications. You will receive specific instructions from the clinic or hospital when your appointment is scheduled. It's very important to follow these instructions carefully to ensure the quality of your exam and your safety.

Mount Sinai Hospital
Suite 19 231P, 555 University Ave, Department of Paediatrics
Toronto, ON M5G 1X8

Phone: (416) 813-7874

The facility is wheelchair accessible.

Dr. Greer is a licensed physician regulated by the College of Physicians and Surgeons of Ontario (CPSO) under the Medicine Act, 1991 in ON. Imaging services are typically provided based on referrals from other physicians.

Verify registration with the College of Physicians and Surgeons of Ontario (CPSO): https://doctors.cpso.on.ca/DoctorDetails/Greer-MaryLouise-Catherine/0157600-73273