Final answer:
The test that could be used to help diagnose a dissection is Transesophageal echocardiography.
Step-by-step explanation:
The test that could be used to help diagnose a dissection is Transesophageal echocardiography (option B).
Transesophageal echocardiography is a medical imaging technique that uses high-frequency sound waves to create detailed images of the heart. It involves inserting a flexible probe with a ultrasound transducer on its tip into the esophagus, which allows for a closer and clearer view of the heart compared to a regular echocardiography.
The other options, Left-sided heart catheterization (A), Pulmonary perfusion scan (C), and Ventilation-perfusion scan (D), are not typically used to diagnose a dissection.