Fig. 7From: Performance of a 3D convolutional neural network in the detection of hypoperfusion at CT pulmonary angiography in patients with chronic pulmonary embolism: a feasibility studyOne patient with previous upper lobe left pneumonectomy, and the remaining lung parenchyma was low in HU, resulting in large false positive predictions by the convolutional neural network. HU Hounsfield unitsBack to article page