The Association between the Pulmonary Arterial Obstruction Index and Atrial Size in Patients with Acute Pulmonary Embolism

Figure 1

Radiological indices defined in computed tomography pulmonary angiography (CTPA). The figure, depicting a sample of computed tomography pulmonary angiography (CTPA) image and the indices defined for measuring different sizes. a, b, and c imply RA long diameter, short diameter, and area, respectively. d, e, and f imply LA long diameter, short diameter, and area, respectively.