Lung Perfusion
Lung Perfusion imaging, also known as Lung V/Q (Ventilation/Perfusion) scan, is a nuclear medicine procedure used to assess blood flow to the lungs and detect pulmonary embolism (blood clot in the lung). It evaluates the distribution of blood flow and ventilation within the lungs to diagnose conditions such as pulmonary embolism, pulmonary hypertension, and lung nodules.
What is the need for the study?
The Lung Perfusion study is performed to:
- Detect and diagnose pulmonary embolism, which is a potentially life-threatening condition that requires prompt treatment.
- Evaluate pulmonary vascular function and assess the severity of pulmonary hypertension.
- Assess lung function and perfusion abnormalities in patients with lung nodules or other pulmonary conditions.
This study helps healthcare providers make accurate diagnoses and develop appropriate treatment plans to manage lung disorders and optimize patient outcomes.
How do I prepare?
Preparation for a Lung Perfusion scan may include:
- Medication: Inform your healthcare provider about any medications you are taking, as certain medications may need to be temporarily stopped before the study.
- Fasting: You may be instructed to fast for a period before the study, typically for several hours, to ensure an empty stomach for accurate imaging.
- Medical History: Provide your healthcare provider with a detailed medical history, including any previous lung or heart conditions, surgeries, or allergies.
Your healthcare provider will provide specific instructions on how to prepare for the Lung Perfusion scan based on your individual circumstances.
How is this scan performed?
During a Lung Perfusion scan:
- Radiotracer Injection: A small amount of a radioactive tracer, typically technetium-99m (Tc-99m) macroaggregated albumin (MAA), is injected into a vein in your arm. The tracer particles are carried by the bloodstream to the lungs and become trapped in the small blood vessels, allowing visualization of lung perfusion.
- Imaging: A gamma camera is used to acquire images of the lungs from various angles. The camera detects the gamma rays emitted by the tracer particles, producing detailed images of lung perfusion.
- Ventilation Imaging (Optional): In some cases, a ventilation scan may be performed simultaneously with the perfusion scan to assess lung ventilation. This involves inhaling a radioactive gas or aerosol, such as xenon-133 or technetium-99m labeled aerosols, and imaging the distribution of the inhaled tracer within the lungs.
What should I do after the scan?
After the Lung Perfusion scan:
- Resume Normal Activities: You can usually resume your normal activities immediately after the scan.
- Follow-Up: Attend any scheduled follow-up appointments with your healthcare provider to review the results of the scan and discuss further management, if necessary.
Are there any risks in the study?
Lung Perfusion imaging is generally considered safe and non-invasive. The amount of radiation exposure from the radioactive tracer used in the scan is minimal and poses little risk to most patients. However, as with any radiation-related medical procedure, there is a slight risk of allergic reactions or adverse effects.
Your healthcare provider will discuss the potential risks and benefits of the Lung Perfusion scan with you and address any concerns you may have before proceeding with the procedure.
It’s essential to follow all instructions provided by your healthcare provider and communicate any symptoms or concerns you experience during or after the Lung Perfusion scan. Your healthcare team is here to support you throughout the process and ensure the best possible outcomes for your lung health.
