Nuclear medicine refers to imaging that uses small amounts of radioactive material, called radiotracers, to diagnose and evaluate various conditions. These radiotracers are introduced into the body, and specialized cameras detect the energy they emit. Unlike standard imaging methods that show only structure, nuclear medicine reveals how organs and tissues function at a cellular level. For inflammatory bowel disease (IBD), these functional insights can support the work of gastroenterologists and imaging specialists. Here’s information on nuclear medicine and how it may be used to assess IBD:
Positron Emission Tomography Scan
IBD includes conditions such as Crohn’s disease and ulcerative colitis, and for proper diagnosis, many people need nuclear medicine scans. A positron emission tomography (PET) scan uses a radiotracer, often a form of glucose, to highlight areas of increased metabolic activity in the body. Inflamed tissue tends to consume more glucose than surrounding healthy tissue, so a PET scan shows regions of active inflammation. This is beneficial for IBD and detecting inflammation along the digestive tract.
Physicians sometimes combine PET with computed tomography (CT) in a single session, providing functional and anatomical detail in one study. This combined approach can help specialists locate affected segments of the bowel and assess the extent of disease activity. Imaging results are always interpreted alongside clinical findings, laboratory data, and a patient’s medical history.
Gastric Emptying Study
A gastric emptying study (GES) measures how quickly food moves from the stomach into the small intestine. During the test, a patient eats a meal containing a small amount of radiotracer, and a camera records images. This information helps clinicians understand digestive motility, which can be altered in some individuals living with IBD. Delayed or accelerated gastric emptying may contribute to symptoms such as:
- Nausea
- Bloating
- Discomfort
The study is noninvasive, and it provides data that structural imaging alone cannot capture. Results from a GES provide the care team with a clearer picture of how the upper digestive system is functioning.
Glomerular Filtration Rate
The glomerular filtration rate (GFR) reflects how well the kidneys filter waste from the blood; monitoring kidney function helps physicians make informed decisions about ongoing treatment. Nuclear medicine can measure GFR using a radiotracer that the kidneys process, allowing for a precise assessment of renal function. This measurement may be recommended for IBD because some medications used to manage the condition may affect the kidneys. A nuclear GFR study is particularly useful when accurate values are needed to guide medication dosing or to track changes across follow-up visits.
Benefiting From Nuclear Medicine
Nuclear medicine offers a different perspective on inflammatory bowel disease by focusing on function rather than structure alone. Diagnostic tools such as PET scans, gastric emptying studies, and GFR measurements each contribute distinct types of information to the diagnostic process. These tools help specialists evaluate symptoms like inflammation and digestive motility; a range of diagnostic tools supports practitioners in providing individualized care.
Because nuclear medicine studies are generally noninvasive and use only small amounts of radioactive material, they can be repeated when clinicians need to monitor changes over time. Healthcare providers can explain the purpose of each study and how the results fit into your care plan. To learn personalized information, contact a radiologist today.
