What Is an MRI?
Magnetic Resonance Imaging (MRI) is a safe, non-invasive test that creates highly detailed images of your body’s soft tissues and organs - without using radiation (unlike X-ray or CT scans). It uses a large magnet, radio waves, and advanced computer technology to produce two and three dimensional images.
MRI is one of the most effective tools for detecting cardiovascular, neurological, oncological, and musculoskeletal conditions early and accurately.
How MRI Scanners Work
During an MRI exam, you lie on a table that slides into the scanner. MRI machines come in two main types:
- Closed MRI: A traditional cylinder-shaped scanner with an opening about 60 cm - 70cm in diameter. Newer short-bore models are shorter and often more comfortable.
High-Field vs. Low-Field MRI
MRI scanners also differ by magnetic strength:
- High-field MRI (1.0–3.0 Tesla): Provides the clearest images and typically takes 25-45 minutes.
- Low-field MRI (0.2–1.0 Tesla): More commonly used in open MRI systems, with scan times around 60 minutes.
Higher magnetic strength generally means sharper images and quicker exams.
What to Expect During Your MRI
A certified MRI technologist will guide you through the entire process. They position you on the table, operate the scanner from a nearby room, and communicate with you throughout the exam.
A radiologist selects the imaging sequences, reviews your images, and reports any findings such as changes in organs, bones, blood vessels, or soft tissues. In some cases, a contrast injection may be used to make certain details clearer.