Which imaging test is commonly used for diagnosing pulmonary embolism?

Helical CT Pulmonary Angiography is the most commonly used imaging test for diagnosing pulmonary embolism. This technique allows for rapid, non-invasive visualization of the pulmonary arteries, providing detailed images that can identify occlusions or blockages caused by emboli.

The helical CT scan involves taking continuous slices of images in a spiral pattern, which enhances the speed and accuracy of the examination. The use of contrast material helps in delineating the pulmonary vasculature, making it easier to spot any clots that may be present. Due to its high sensitivity and specificity for detecting pulmonary embolism, it is often considered the gold standard in clinical practice.

In contrast, X-rays and MRI are not typically used for this purpose. X-rays have limited ability to visualize blood vessels and are not specific for pulmonary embolism, often appearing normal even when a clot is present. MRI can provide information about blood flow but is less practical and commonly used in an emergency setting for this specific diagnosis. Ultrasound is primarily utilized for evaluating deep vein thrombosis (DVT) in the legs, which can lead to pulmonary embolism if clots dislodge and travel to the lungs, but it does not directly assess the pulmonary arteries. This makes Helical CT Pul