Noninvasive imaging plays a key role in both the diagnosis and management of patients with pulmonary hypertension (PH). In recent years, there have been 2 major changes in perspective of imaging in PH. The first was the realization that imaging should focus on the evaluation of not only the pulmonary pressures but also the cardiopulmonary unit. The second was the emergence of multimodality imaging with a complementary role for echocardiography, magnetic resonance, computed tomography, and positron emission tomography. These techniques not only help in the diagnosis of PH but also help identify factors that determine risk and prognosis and gauge therapeutic effects on right ventricular Â function in patients with pulmonary arterial hypertension.