Pulmonary hypertension is a complex pathophysiologic condition in which several clinical realities increase pressure in the pulmonary rotation, precipitously injuring cardiopulmonary function and, if undressed, causing right ventricular failure. The major role of imaging is to establish the diagnosis of PH and classify the PH into one of the five groups. Imaging is also used in the quantification of volumes and function, which is necessary for prognosis, therapy, and assessing response to treatment.