Which imaging test is used to diagnose pulmonary embolism?

Helical CT Pulmonary Angiography is considered the gold standard for diagnosing pulmonary embolism. This imaging test is specifically designed to visualize the blood vessels of the lungs, allowing for the detection of clots within the pulmonary arteries. The helical (or spiral) CT scan utilizes advanced imaging technology to provide detailed cross-sectional images, which helps in identifying any obstruction caused by emboli.

In the context of pulmonary embolism, rapid diagnosis is crucial because timely treatment can significantly improve patient outcomes. Helical CT Pulmonary Angiography can often be performed quickly and is widely available in emergency settings. It is highly sensitive and specific for detecting blood clots in the pulmonary circulation, which makes it the preferred choice in clinical practice for evaluating this condition and assessing the extent of vascular occlusion.

Other imaging modalities like chest X-ray may initially be used to rule out other conditions but do not provide the detailed information needed to confirm a pulmonary embolism. Ultrasound is typically utilized for diagnosing deep vein thrombosis, which could lead to a pulmonary embolism but does not directly visualize the lungs. MRI is not commonly used for this purpose due to its availability, longer acquisition times, and the need for the patient to remain still in a confined space, making it