Table 1.

A summary of the criteria used for diagnosis of pulmonary thromboembolism (PTE) by computed tomography pulmonary angiography (CTPA) in this study

PTE diagnosis	Criteria (only one required per category)
Positive	Complete pulmonary arterial occlusion.
	Central intraluminal arterial filling defect(s) present.
	Peripheral intraluminal arterial filling defect(s) present.
Suspicious	Luminal irregularities in central or peripheral pulmonary arteries.
	Differences in contralateral arterial luminal density.
	Multi-focal alveolar pattern with no probable alternative diagnosis.
Negative	None of the above.

Only one criterion in the positive category was necessary for that classification to be assigned. If none of these criteria were satisfied, then any one of the criteria in the suspicious category led to classification of the patient as suspicious for PTE. A negative diagnosis was only made when none of the criteria listed were satisfied