A Center for Diagnostic Imaging Is Where Doctors Send You for Scans and X-Rays

A Center for Diagnostic Imaging is a medical facility that takes pictures inside your body using machines — X-rays, CT scanners, ultrasound, MRI machines, and similar equipment. Your doctor orders these scans when they need to see what is happening inside you without surgery. The center does not treat the condition; it creates the images your doctor uses to make a diagnosis or monitor a known problem.

These centers exist as standalone buildings, inside hospitals, or as part of larger medical groups. Some are owned by radiologists (doctors who specialize in reading images), others by hospitals or health systems. The key difference from a hospital radiology department is usually size and focus — a diagnostic imaging center may have fewer machines and handle only outpatient scans, while a hospital radiology department serves both emergency patients and scheduled appointments.

You do not go to a diagnostic imaging center on your own. Your primary care doctor, specialist, or urgent care provider must order the scan first. The center schedules you, you arrive for your appointment, a technician operates the machine, and a radiologist reads the images and sends a report back to your doctor within hours or days.

Key Takeaways

  • A diagnostic imaging center performs X-rays, CT scans, MRI scans, ultrasounds, and similar imaging tests that your doctor orders.
  • You need a doctor's order before scheduling; you cannot walk in and request a scan on your own.
  • The technician operates the machine and the radiologist reads the images, but your own doctor interprets the results in the context of your symptoms and medical history.
  • Insurance coverage and out-of-pocket costs depend on your plan, whether the center is in-network, and the type of scan.
  • Preparation varies by scan type — some require fasting, contrast dye, or arriving early; your appointment confirmation will specify what you need to do.

What Machines and Tests a Diagnostic Imaging Center Offers

Most diagnostic imaging centers have several types of equipment. An X-ray machine is the simplest and fastest — it takes a two-dimensional picture and is used for broken bones, chest infections, and dental work. A CT scanner (computed tomography) takes many X-ray images from different angles and combines them into a three-dimensional picture; it is faster than MRI and often used for trauma, cancer staging, and lung problems.

An MRI machine uses magnetic fields and radio waves instead of radiation to create detailed images, especially good for soft tissue like the brain, spinal cord, joints, and organs. An ultrasound machine uses sound waves to create live images and is common for pregnancy, blood vessel flow, and abdominal organs. Some centers also offer mammography (breast imaging), bone density scans, or nuclear medicine scans where you receive a small amount of radioactive tracer that shows how organs function.

Not every center has every machine. Smaller centers may have only X-ray and ultrasound. Larger ones or those affiliated with hospitals may have all of these plus specialized equipment. Your doctor knows which center near you has the machine you need, or your insurance company can direct you to an in-network facility.

How to Schedule an Appointment at a Diagnostic Imaging Center

Your doctor's office sends the order to the imaging center electronically or by phone. The center then calls you to schedule. You will need to provide your insurance information, confirm you have no metal implants or other contraindications (especially for MRI), and learn what to do before your appointment.

Preparation depends on the scan. For a chest X-ray, you may need only to remove jewelry and wear a gown. For an abdominal CT, you might fast for four hours and drink contrast liquid beforehand. For an MRI, you must remove all metal — watches, hearing aids, pacemakers, and some surgical implants disqualify you entirely. For an ultrasound, you may need a full bladder or an empty stomach. The center's scheduling staff will tell you exactly what applies to your scan.

Arrive 10 to 15 minutes early to check in. Bring your insurance card and photo ID. The technician will position you, explain what will happen, and operate the machine. Most scans take 15 to 45 minutes. You can usually return to normal activity when ready afterward unless you received sedation or contrast dye.

What Happens After Your Scan Is Complete

The radiologist reads your images, usually within 24 hours but sometimes the same day for urgent cases. They write a report describing what they see and send it to your doctor's office. Your doctor then reviews it, contacts you with the results, and explains what the findings mean for your care.

You do not typically receive the images or report directly from the imaging center — they go to your doctor. However, you can usually request a copy of your images on a CD or ask for them to be sent to another doctor if you are seeking a second opinion. Some centers now offer patient portals where you can view your report online.

If the radiologist finds something unexpected or urgent, the center may contact your doctor when ready rather than waiting for a routine report. Your doctor is responsible for following up with you about any findings and deciding on next steps — whether that means more imaging, a specialist visit, or treatment.

Insurance Coverage and Out-of-Pocket Costs

Most insurance plans cover diagnostic imaging when your doctor orders it, but your out-of-pocket cost depends on your specific plan. Some plans cover imaging at 100% after you meet your deductible. Others require a copay per scan (typically $25 to $100) or coinsurance (you pay a percentage). Out-of-network centers usually cost more.

Before your appointment, call your insurance company or check your plan documents to learn your responsibility. Ask whether the imaging center is in-network and what your copay or coinsurance will be. If cost is a concern, tell your doctor — they may be able to order the scan at a lower-cost facility or explore whether a less expensive imaging method would answer the same question.

If you do not have insurance, ask the imaging center about their cash prices. Many offer discounts for uninsured patients who pay upfront, and some have financial information programs. Do not skip a necessary scan because of cost without discussing options with your doctor first.

Differences Between a Diagnostic Imaging Center and a Hospital Radiology Department

A standalone diagnostic imaging center and a hospital radiology department both perform the same scans, but they operate differently. A hospital radiology department handles emergency patients (trauma, stroke, heart attack) alongside scheduled appointments, so wait times can be longer and hours may be limited. A diagnostic imaging center typically handles only scheduled outpatient scans, so appointments are often easier to book and wait times shorter.

Hospital radiology departments are usually more expensive because the cost includes hospital overhead. Diagnostic imaging centers may be cheaper, especially if they are independent rather than hospital-owned. However, if you need imaging as part of an emergency or hospital stay, you will use the hospital's radiology department — you do not have a choice.

For routine scans ordered by your doctor, your insurance company or doctor's office will direct you to a specific center. If you have a preference, ask your doctor whether they can send you to a particular facility. Many doctors have relationships with specific imaging centers and may prefer to send patients there.

What to Know Before Your First Imaging Appointment

Bring your insurance card, photo ID, and any paperwork the center sent you. Wear comfortable, loose clothing without metal buttons or zippers if possible — you may need to change into a gown. Remove jewelry, watches, hearing aids, and anything else metal before entering the scan room.

Tell the technician if you are claustrophobic, anxious, or have had a bad experience with imaging before. They can explain what will happen step by step and may be able to adjust the environment — for example, some MRI machines have mirrors so you can see out, or the technician can play music. If you have metal implants, tell the scheduling staff when you book, not when you arrive, because some implants mean you cannot have certain scans at all.

Ask questions if you do not understand the preparation instructions. It is better to call the center back than to arrive unprepared and have your appointment rescheduled. If you are pregnant or think you might be, tell your doctor and the imaging center before your scan — some imaging methods are not safe in pregnancy.

Frequently Asked Questions

Do I need a referral from my doctor to go to a diagnostic imaging center?

Yes. Your doctor must order the scan first. You cannot walk into a diagnostic imaging center and request a scan on your own. The order tells the center what type of scan you need and why, and it is required for insurance coverage.

How long does it take to get results from a diagnostic imaging scan?

Most results are ready within 24 hours. Some urgent scans are read the same day. Your doctor's office will contact you with the results, usually by phone or through a patient portal. Do not call the imaging center for results — they send the report to your doctor, not directly to you.

Is radiation from X-rays and CT scans dangerous?

The radiation dose from a single X-ray or CT scan is small and the benefit of diagnosis usually outweighs the risk. However, if you need multiple scans, tell your doctor so they can space them out if possible or use non-radiation methods like ultrasound or MRI when appropriate. Pregnant women should tell their doctor before any scan involving radiation.

What if I cannot afford the scan my doctor ordered?

Talk to your doctor about the cost. They may be able to order the scan at a lower-cost facility, use a different imaging method that is cheaper, or help you find financial information. Many imaging centers offer discounts for uninsured patients or payment plans. Do not skip a necessary scan without discussing options with your doctor.

Can I bring someone with me to my imaging appointment?

Usually yes, but they cannot go into the scan room with you. A support person can wait in the waiting area. If you need someone to drive you home because of sedation, arrange that in advance. Ask the center what their policy is when you schedule.