X-ray, ultrasound, CT or MRI: what's the difference?
They are different ways of looking inside the body. X-ray is fast and good for bones, ultrasound uses sound waves to look at soft tissues and organs, and CT and MRI give more detail and dimension for specific problems. Your provider picks the one that fits your question.
X-ray
A quick image using a small dose of radiation. Common for bones, joints and the chest. Many clinics take walk-ins. See how to get an X-ray in Ontario.
Ultrasound
Sound waves and a probe, with no radiation. Used for soft tissues and organs, such as the abdomen, pelvis, thyroid or leg veins. Usually by appointment. See how to book an ultrasound.
CT scan
Uses X-rays to build detailed cross-section images. Provides more detail than a regular X-ray.
MRI
Uses a strong magnet and radio waves instead of radiation. Good for soft tissue, joints and the brain. Scans are longer.
Which do you need?
Your provider decides, and you can ask why they chose it. NextAva lists X-ray, ultrasound, bone density and mammography clinics. CT and MRI are usually done at hospitals or other facilities.