You’ve likely heard of MRI, CT, and PET scans, but understanding how they work and when they’re useful can help you make informed decisions about your health. Here’s a closer look at the differences between these vital imaging tools and how they can benefit you or your loved ones.
What They Have in Common
All three imaging tests allow doctors to see inside the body without surgery. They’re used to diagnose diseases, monitor treatment progress, stage cancer, and detect conditions early when intervention is most effective.
What Is CT (Computed Tomography)?
This test uses X-rays and radiation to produce 3D images inside our body. It takes cross-sectional pictures to show internal organs and their shape along with bones and blood vessels. All these images are then put back together and shown on a computer screen for the radiologist to interpret. Each image can be turned around or spun so it can be viewed from all angles.
Common Uses for CT:
A CT scan is used for:
- Diagnosing cancer or heart disease
- Evaluating trauma or injury
- Detecting musculoskeletal disorders
What Is MRI (Magnetic Resonance Imaging)?
MRI uses strong magnets and radiowaves to produce highly detailed images of soft tissues without radiation exposure. Patients must remove any metal objects and inform the technician about implants or devices.
The test is loud and patients are given headphones or earplugs. They can take 30 to 60 minutes to complete.
Common Uses for MRI:
- Detecting tumors
- Identifying torn ligaments
- Diagnosing brain and spinal cord injuries
- Planning future surgeries
Sometimes this test requires the patient to be injected with a contrast dye so the radiologist can highlight specific areas.
What Is PET (Positron Emission Tomography)?
PET scans detect chemical changes in the body and can detect abnormalities before any structural changes occur. They are highly effective at identifying early-stage cancer.
The patient is injected with a small dose of a radioactive substance through an IV line. This is known as a radiotracer which moves through your bloodstream and any activity is recorded.
Common Uses for PET Scans:
- Early cancer detection
- Evaluating heart disease or brain disorders
- Monitoring unusual cellular activity
Key Differences of CT, MRI, and PET Scans
- CT scans offer fast, clear images ideal for emergency situations.
- MRI scans provide superior contrast resolution for soft tissue evaluation.
- PET scans detect early signs of disease at the cellular level, particularly for cancer.
Why Choose Alabama Coastal Radiology
At Alabama Coastal Radiology, we are proud to offer state-of-the-art CT, MRI, and PET imaging services in the Mobile area. Our expert radiologists and compassionate staff ensure every patient receives personalized care in a comfortable environment. We use the latest technology to provide fast, accurate results, helping your healthcare team make informed decisions about your care.
If your doctor has recommended an imaging test, trust Alabama Coastal Radiology for precise, high-quality diagnostics. Call your preferred location directly to learn more about the imaging services we offer.
Sources:
PET Scan: What It Is, Types, Purpose, Procedure & Results (clevelandclinic.org)
PET Scan Vs. MRI: What’s the Difference – Baptist Health
CT scan vs. MRI: What’s the difference? | MD Anderson Cancer Center