Two imaging options often come up when people want a comprehensive look at their health, and both full-body MRIs and full-body CT scans are very useful in the right diagnostic context.
If you’re considering a CT scan or an MRI scan in Brooklyn, New York, you’ve probably wondered which one makes more sense and whether you even need a “full-body” scan at all. At City Wide Radiology, we want to help you make an informed decision.
How Does Each Scan Work?
Magnetic resonance imaging (MRI) and CT (computed tomography) scans both produce detailed cross-sectional images of your body, but they work in completely different ways.
An MRI uses a powerful magnetic field and radio waves. It doesn’t involve any X-rays or ionizing radiation. This makes it exceptionally safe for repeated use and ideal for soft-tissue imaging, capturing fine details of the brain, spinal cord, ligaments, joints, and internal organs.
A CT scan uses rotating X-ray beams and computer processing to build precise, layered images. It excels at visualizing bones, the lungs, and internal bleeding, and produces results far more quickly than an MRI. The trade-off is radiation exposure. CT delivers ionizing radiation, which the FDA notes should be used only when medically necessary.
Americans undergo approximately 40 million MRI scans and over 80 million CT scans annually, a dramatic rise from just 3 million CT scans performed in 1980.
Yet a 2025 study published in JAMA Internal Medicine found that 93 million CT examinations in 2023 could be linked to roughly 103,000 future cancers, reinforcing why the American College of Radiology cautions against routine whole-body scanning in asymptomatic patients. For most people, targeted, symptom-driven imaging remains the far safer and more effective choice.
The Key Differences: Radiation, Speed, and Detail
The most important distinction between these two modalities is radiation. A full-body MRI doesn’t involve ionizing radiation, making it the safer choice for people who need multiple scans or are concerned about cumulative exposure.
CT has the speed advantage. In an emergency after a traumatic injury, CT can reveal internal bleeding, fractures, and organ damage quickly. For non-urgent diagnostic imaging focused on soft tissues, nerves, or joints, MRI delivers superior image quality and contrast.
What About a Full-Body Scan for Preventive Health Screening?
Major medical bodies, including the American College of Radiology (ACR) and the FDA, do not recommend whole-body CT or full-body MRI for preventive health screening in people without specific symptoms or risk factors.
A full-body MRI may be appropriate when a physician identifies a specific diagnostic rationale, such as hereditary cancer syndrome or a strong family history. Full-body scanning works best when focused on specific medical issues.
Understanding an MRI Exam vs. a CT for Specific Concerns
Choosing the right scan comes down to your symptoms and your doctor’s judgment:
- A targeted MRI exam is appropriate for soft-tissue conditions, including disc herniations, ligament tears, brain abnormalities, or nerve root compression.
- CT scans tend to be the first choice when speed matters and the concern involves bones, the lungs, or acute abdominal problems like appendicitis or kidney stones.
The best scan is the one that your physician determines is right for your situation.
Getting an MRI After a Car Accident: Which Scan Comes First?
After patients suffer injuries from a motor vehicle accident, the correct sequence of diagnostic testing matters. In the acute phase, and especially if internal bleeding or organ damage is indicated, physicians often order a CT first for its speed and breadth.
An MRI after a car accident is more common once a patient stabilizes, or when classic auto accident injury symptoms persist, including
- Neck pain
- Back pain
- Numbness
- Neurologic changes
MRIs are useful for examining soft-tissue structures like spinal discs and nerve roots that CT can miss. The two scans complement rather than compete in trauma care.
Is an Open MRI Scan Right for You?
When claustrophobia, anxiety, or body size make a standard closed MRI uncomfortable, an open MRI scan offers a more spacious alternative.
City Wide Radiology’s Hitachi AIRIS II open MRI equipment combines patient comfort with strong clinical capability. Open MRI units often operate at lower field strengths than closed systems, which can affect resolution for certain studies.
Our team can help determine whether an open system suits your specific MRI exam.
Scheduling Your CT Scan or MRI in Brooklyn, New York
Whether you’re coming in for post-accident imaging or a physician-referred diagnostic study, City Wide Radiology is here to help. We offer both open and 3T high-field MRI, as well as multi-slice CT, all read by board-certified radiologists.
Whether your doctor has ordered a full-body MRI or a targeted CT or you have questions about the common conditions diagnosed with CT scans, City Wide Radiology’s knowledgeable staff is ready to assist.
Call us today at (718) 236-6800 or visit us online to book your appointment. Our doctors accept most insurance plans, including workers’ compensation, no-fault, and PIP (personal injury protection). Same-day appointments may be available.
Frequently Asked Questions: Full-Body MRI vs. Full-Body CT Scan
Here are answers to some common questions patients ask about full-body MRI and CT scans.
Can I Eat and Drink Normally Before My Scan?
You can eat and drink normally before most MRI scans, unless your physician instructs otherwise. CT scans involving contrast dye may require fasting for several hours beforehand, so be sure to follow the specific preparation instructions provided by your imaging center before your appointment.
How Long Does a Full-Body MRI Typically Take Compared to a Full-Body CT?
A full-body MRI usually takes 45 to 90 minutes because it captures multiple detailed sequences. A full-body CT is significantly faster, often completed in 10 to 15 minutes.
How Soon Will I Receive My Results After a Scan?
The time it takes for you to receive your results after a scan varies, but most results are reviewed by a board-certified radiologist and sent to your referring physician within one to two business days. At City Wide Radiology, our team works to ensure we deliver accurate reports as quickly as possible.