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What Is a Fluorescence Imaging System?

A fluorescence imaging system is a medical imaging device that helps clinicians see fluorescent signals from tissue, dyes, or contrast agents. It uses a light source to excite fluorescent material and a camera or detector to capture the emitted light. Many surgical systems use near-infrared fluorescence to help visualize blood flow, lymphatic drainage, tissue perfusion, or selected anatomy. The images are used as an aid during care, not as the only basis for a clinical decision.

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What Is a Fluorescence Imaging System?

A fluorescence imaging system is a medical imaging device that helps clinicians see fluorescent signals from tissue, dyes, or contrast agents. It uses a light source to excite fluorescent material and a camera or detector to capture the emitted light. Many surgical systems use near-infrared fluorescence to help visualize blood flow, lymphatic drainage, tissue perfusion, or selected anatomy. The images are used as an aid during care, not as the only basis for a clinical decision.

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What Is a Fluorescence Imaging System Used For?

A fluorescence imaging system is used to help highlight structures or patterns that may be hard to see with standard white light. In surgery, it can help assess tissue blood flow, identify lymph nodes, guide tumor-margin evaluation in selected settings, or support biliary and vascular visualization. Some systems require an injected fluorescent agent such as indocyanine green, while others may detect naturally fluorescent tissue. The intended use depends on the device, dye, procedure, and clinical setting.

How a Fluorescence Imaging System Works

The system shines a specific wavelength of light onto the target area. Fluorescent material absorbs that light and emits light at a different wavelength. A filtered camera detects the emitted signal and displays it on a monitor, often alongside standard video. Software may adjust contrast, overlay images, or help the team compare fluorescence intensity.

How Is a Fluorescence Imaging System Used?

The clinical team prepares the imaging system, confirms the intended dye or fluorescent target, and positions the camera over the surgical or exam area. If a contrast agent is used, it is given according to the approved instructions and timing for the procedure. The team watches the display while interpreting the fluorescence pattern with anatomy, lighting, and the patient’s condition in mind. Findings may guide inspection, dissection, sampling, or treatment planning.

Risks and Limitations

Fluorescence imaging depends on correct device setup, dye timing, tissue depth, camera angle, and signal quality. It may miss deeper structures or show weak signals when tissue is thick, bleeding, poorly perfused, or outside the device’s detection range. Contrast agents can have side effects or allergy risks in some patients. The system should support clinical judgment rather than replace direct visualization, pathology, imaging, or surgeon assessment.

FAQs About Fluorescence Imaging Systems

Does a fluorescence imaging system use radiation?

Most surgical fluorescence imaging systems use light, not ionizing radiation. The exact technology depends on the device and procedure.

Does fluorescence imaging require dye?

Often, yes. Many systems use a fluorescent contrast agent, but some applications detect natural tissue fluorescence or other labeled targets.

Can fluorescence imaging diagnose cancer by itself?

No. It can help identify suspicious areas or guide tissue assessment, but diagnosis usually requires pathology, imaging, and clinical review.

Is fluorescence imaging safe?

It is generally considered safe when used as directed, but risks depend on the device, dye, patient factors, and procedure. Patients should tell the care team about allergies and prior reactions.

References

2025 Guidelines for Fluorescence Image-Guided Surgery with Indocyanine Green. SAGES. https://www.sages.org/publications/guidelines/figs-with-icg-guidelines/. Date Accessed June 15, 2026.

IC-Flow Imaging System 2.0 510(k) Premarket Notification K243645. U.S. Food and Drug Administration. https://www.accessdata.fda.gov/cdrh_docs/pdf24/K243645.pdf. Date Accessed June 15, 2026.

Review of Fluorescence Guided Surgery Systems. PubMed Central. https://pmc.ncbi.nlm.nih.gov/articles/PMC4985715/. Date Accessed June 15, 2026.

Indocyanine Green Fluorescence-Guided Surgery in the Emergency Setting: WSES International Consensus Position Paper. PubMed Central. https://pmc.ncbi.nlm.nih.gov/articles/PMC11823064/. Date Accessed June 15, 2026.

Applications of Indocyanine Green Based Near-Infrared Fluorescence Imaging in Hepatobiliary Surgery. PubMed Central. https://pmc.ncbi.nlm.nih.gov/articles/PMC5179356/. Date Accessed June 15, 2026.