What is Nuclear Medicine?

By Alyssa Speicher August 6, 2017

Nuclear medicine, admittedly, can sound a bit scary. The term “nuclear” often has negative connotations, but fear not: nuclear medicine is not medicine practiced in a nuclear power plant. Once you know what nuclear medicine is, you’ll see that it is far from scary and that what it can do is actually amazing.


What is nuclear medicine?

Nuclear medicine is a type of medical specialty that uses very small amounts of radiation administered inside your body to detect, diagnose, and even treat a multitude of diseases and conditions. Radiologists interpret the images from your nuclear medicine imaging exam to diagnose and treat your condition.

Nuclear Medicine Radiologist Reading Images

During a nuclear medicine procedure, doctors will use radioactive medicine in the form of injection, pill, or gas to target a part of your body and produce images that show your internal structures and their functions. Nuclear medicine procedures can often detect diseases early, sometimes even before you experience any symptoms! Depending on why you need medical images, nuclear medicine can be the best option for the quality of your care.

How does it work?

Nuclear medicine uses radiopharmaceuticals or radiotracers that carry a small dose of radiation. They are designed to travel to a particular part of your body so that they can gather the kinds of images the radiologist needs. Radiotracers can be injected into your bloodstream, swallowed in a pill, or inhaled as a gas.

Once the radiotracer is active in the part of your body you’re having imaged, a technologist will use a scanner and a computer to create the images of your organs and tissues. The scanners read the radiotracer to document the processes of organs and other functions in your body.

UVA Nuclear Medicine

Gamma Camera

Your technologist could use a gamma camera, which looks like a CT machine (a giant circle with a doughnut hole that a table slides through), or a positron emission tomography (PET) scanner which also resembles a CT scanner. These machines do not use radiation waves themselves, but they can read the radiation in the radiotracer inside your body.

What does nuclear medicine look for?

Nuclear medicine procedures diagnose and treat diseases. They can produce images that radiologists can use to make a diagnosis based on structural appearance of your organs and how your organs, tissues, and bones are functioning. This is unlike other common imaging exams that cannot capture what your organs look like while they’re actually working.

Nuclear medicine is used for detecting and staging cancer and other diseases, localizing tumors, monitoring cancer recurrences, and detecting some diseases in their earliest stages. Some of the things nuclear medicine can diagnose and treat:

  • Epilepsy
  • Parkinson’s disease
  • Abnormal lesions
  • Alzheimer’s disease
  • Cancers
  • Problems with transplanted organs
  • Problems with heart, brain, and other organ function

Why/when is nuclear medicine necessary?

Sometimes, nuclear medicine procedures are the best way to find and diagnose diseases in their earliest stages, while they are most treatable. Other times, nuclear medicine procedures serve as a faster, noninvasive, less expensive alternative to exploratory surgery.

UVA Nuclear Medicine

Radiologists and technologist with patient

If your doctor is recommending you have a nuclear medicine procedure, it is probably the right choice for you. After all, these exams are the best at early disease detection and imaging the function of organs and tissues.

Is nuclear medicine safe?

The short answer: yes. Of course we wouldn’t give you something that might cause harm. Don’t worry. There is not enough radiation in the radiotracers to hurt you, even over a long time; just enough radiation is used to get good enough pictures for an accurate diagnosis and no more.

They also control how much radiation is given to a particular patient by modifying the radiotracer to meet each patient’s individual need. And the machines used to image your body do not use radiation, so you’re not getting a double dose. The radiation in the radiotracer is the only radiation you will receive in this exam.


At UVA Health System, we have a dedicated division of nuclear medicine, and we perform a variety of nuclear imaging examinations including PET scans. For more on nuclear medicine visit radiologyinfo.org or see this resource by the Society of Nuclear Medicine.

Related Posts