Lung Ventilation Scintigraphy – Procedure and Uses
Lung ventilation scintigraphy is a nuclear medicine imaging test that visualises airflow distribution in the lungs, commonly used to diagnose pulmonary embolism and other lung conditions.
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Lung ventilation scintigraphy is a nuclear medicine imaging test that visualises airflow distribution in the lungs, commonly used to diagnose pulmonary embolism and other lung conditions.
What is Lung Ventilation Scintigraphy?
Lung ventilation scintigraphy is a nuclear medicine imaging procedure used to evaluate how air is distributed throughout the different regions of the lungs. It helps identify areas that are not receiving adequate airflow. The test is most commonly performed alongside a lung perfusion scan, which assesses blood flow through the lungs. Together, they form the V/Q scan (ventilation-perfusion scintigraphy), a well-established diagnostic tool in pulmonary medicine.
How Does the Test Work?
During the procedure, the patient inhales a mildly radioactive gas or aerosol that is labelled with a radionuclide (a radioactive tracer). Commonly used agents include Technetium-99m-labelled aerosols or the noble gas Xenon-133. These substances distribute throughout the lungs in proportion to the airflow in each region.
A specialised device called a gamma camera then detects the radiation emitted by the radioactive particles and creates detailed images showing which parts of the lungs are well ventilated and which are not. The procedure is painless and typically takes between 20 and 45 minutes.
When is Lung Ventilation Scintigraphy Used?
- Suspected pulmonary embolism: Combined with a perfusion scan, it is a key diagnostic tool when a blood clot in the lungs is suspected.
- Chronic obstructive pulmonary disease (COPD): To assess regional airflow distribution in advanced stages of the disease.
- Pulmonary emphysema: To evaluate ventilation before lung volume reduction surgery.
- Pre-surgical planning: Before lung operations to assess the function of individual lung segments.
- Asthma and other airway disorders: To identify ventilation abnormalities.
Interpreting the Results
A normal result shows an even distribution of the radioactive gas throughout both lungs. Areas of reduced uptake, known as ventilation defects, indicate impaired airflow. In a combined V/Q scan, results are interpreted by comparing ventilation and perfusion findings:
- Matched defect: Both ventilation and perfusion are reduced in the same area – typically seen in pneumonia or COPD.
- Mismatched defect: Perfusion is reduced but ventilation is normal in a given area – this pattern is highly characteristic of pulmonary embolism.
Radiation Exposure and Safety
The radioactive substances used in this test are low-dose and short-lived. The radiation exposure is minimal and comparable to other nuclear medicine imaging tests. The tracer is eliminated from the body quickly through exhaled air or urine. In pregnant or breastfeeding patients, the test should only be performed after careful assessment of the benefits and risks by the treating physician.
Preparation and Procedure
No special preparation is usually required. Patients should inform their doctor of all current medications, known allergies, and any possibility of pregnancy. During the scan, the patient breathes in the radioactive aerosol or gas calmly through a mask or mouthpiece. Multiple images are then taken from different angles using the gamma camera.
References
- Bajc M, Schümichen C, Grupe P, et al. EANM guideline for ventilation/perfusion single-photon emission computed tomography (SPECT) for diagnosis of pulmonary embolism and beyond. European Journal of Nuclear Medicine and Molecular Imaging, 2019; 46(12): 2429-2451.
- Konstantinides SV, Meyer G, et al. 2019 ESC Guidelines for the diagnosis and management of acute pulmonary embolism. European Heart Journal, 2020; 41(4): 543-603.
- Mettler FA, Guiberteau MJ. Essentials of Nuclear Medicine and Molecular Imaging. 7th ed. Elsevier, 2019.
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Related search terms: Lung Ventilation Scintigraphy + Pulmonary Ventilation Scintigraphy + Ventilation Scintigraphy + Lung Ventilation Scan