Which imaging study is most commonly used for evaluating suspected pulmonary embolism?

CT pulmonary angiography is the imaging study most commonly used for evaluating suspected pulmonary embolism due to its high sensitivity and specificity. This method provides detailed images of the pulmonary arteries, allowing clinicians to directly visualize any clot formation. The use of contrast material during the procedure enhances the visibility of blood vessels, making it easier to identify occlusions caused by emboli.

X-rays are not effective for diagnosing pulmonary embolisms, as they mainly assess lung structure and can appear normal even in the presence of an embolism. MRI is typically reserved for specific situations where CT is contraindicated or for evaluating other conditions, such as cardiac problems, rather than for acute pulmonary embolism. Ultrasound, while useful for assessing deep vein thrombosis, does not provide the necessary information about the pulmonary arteries and is not typically used for directly diagnosing pulmonary embolism. Overall, CT pulmonary angiography stands out as the gold standard for this evaluation.