A radiologist is a medical doctor who specializes in diagnosing and treating conditions by interpreting medical images like X-rays, CT scans, MRIs, ultrasounds, and nuclear medicine scans. While you rarely meet them face to face, radiologists play a central role in your care by reading your imaging results, identifying what’s wrong, and communicating findings to the doctor who ordered your test.
How Radiologists Fit Into Your Care
Most people picture radiologists as doctors who “read scans,” and that’s a big part of the job. But their role extends well beyond looking at images on a screen. Radiologists act as expert consultants to your referring physician, helping them choose the right imaging exam for your symptoms, interpreting the results, and recommending next steps based on what they find. If your doctor orders a chest CT to investigate a persistent cough, the radiologist decides whether the images show something that needs a biopsy, a follow-up scan in three months, or nothing concerning at all.
Radiologists also compare your current images to any previous scans you’ve had, looking for changes over time. They correlate imaging findings with your lab results, symptoms, and medical history to build a fuller picture. And they direct the radiologic technologists who actually operate the imaging equipment, ensuring the scans are done correctly and produce usable images.
The Radiology Report
The main product of a radiologist’s work is the radiology report, a structured document sent to your ordering physician. Understanding its sections can help you make sense of your own results if you access them through a patient portal.
The report starts with the type of exam, the date, and the clinical reason your doctor ordered it. A “technique” section describes how the scan was performed, including whether contrast dye was injected. The core of the report is the “findings” section, where the radiologist walks through each area of the body captured in the scan and notes whether it looks normal, abnormal, or potentially abnormal.
The most important section comes last: the “impression.” This is where the radiologist summarizes the key findings, lists possible causes (a differential diagnosis), and makes recommendations. If your doctor is making a treatment decision based on your imaging, they’re relying heavily on this section.
Imaging Technologies Radiologists Use
Radiologists are trained across all major imaging technologies, each suited to different clinical questions:
- X-rays are the fastest and most common, used for fractures, lung infections, and dental problems.
- CT scans combine multiple X-ray images into detailed cross-sections of the body, useful for detecting tumors, internal bleeding, and complex fractures.
- MRI scans use magnetic fields instead of radiation to produce highly detailed images of soft tissues like the brain, spinal cord, joints, and organs.
- Ultrasound uses sound waves and is often the first choice for evaluating pregnancy, abdominal pain, and blood flow in vessels.
- Nuclear medicine and PET scans involve injecting a small amount of radioactive material to track how organs and tissues function, commonly used in cancer staging and heart disease evaluation.
A single radiologist may read hundreds of images across all these modalities in a day, switching between a knee MRI, a chest X-ray, and an abdominal CT within minutes.
Diagnostic vs. Interventional Radiology
Most radiologists work in diagnostic radiology, focused on interpreting images and writing reports. But a significant and growing branch of the field is interventional radiology, where doctors use imaging guidance to perform minimally invasive procedures that once required open surgery.
Interventional radiologists thread catheters through blood vessels while watching their progress on a live X-ray screen. They place stents to open blocked arteries, perform needle biopsies to sample suspicious tissues, insert feeding tubes directly into the stomach, and seal off blood vessels to stop internal bleeding. They can also remove foreign bodies lodged inside blood vessels and use intravascular ultrasound to examine vessel walls from the inside.
These procedures typically involve smaller incisions, shorter hospital stays, and faster recovery times compared to traditional surgery. For many patients, an interventional radiologist is the one actually performing their treatment, even if they never realized a radiologist was involved.
Subspecialties Within Radiology
After completing general training, radiologists can pursue subspecialties recognized by the American Board of Radiology. These include neuroradiology (brain and spine imaging), pediatric radiology (imaging tailored to children’s smaller bodies and unique conditions), nuclear radiology, and pain medicine. Interventional radiology is its own recognized subspecialty as well.
In practice, many radiologists also develop informal subspecialty expertise in areas like musculoskeletal imaging, breast imaging, or cardiac imaging, even without a separate board certification. At large hospitals, you’ll often find radiologists who spend most of their time reading one type of scan for one part of the body, building deep expertise in that area.
Education and Training
Becoming a radiologist requires extensive training. After completing medical school (four years in the U.S.), physicians enter a radiology residency. The training covers all imaging subspecialties during the first several years, followed by focused special interest training. Radiologists who want to subspecialize in interventional radiology complete additional training beyond the standard residency. Including undergraduate education, medical school, and residency, the full path takes roughly 13 years of education and training after high school.
This lengthy training reflects the breadth of knowledge required. Radiologists need to understand anatomy across every organ system, recognize thousands of disease patterns on imaging, and stay current with rapidly evolving technology.
Compensation
Radiology is among the higher-paying medical specialties. According to the U.S. Bureau of Labor Statistics, the median annual wage for radiologists was at least $239,200 as of May 2023. Compensation varies based on subspecialty, geographic location, and practice setting, with interventional radiologists and those in underserved areas often earning more.