Fig. 4From: Performance of a 3D convolutional neural network in the detection of hypoperfusion at CT pulmonary angiography in patients with chronic pulmonary embolism: a feasibility studyAn example case (a) of an overall low attenuation where a predefined HU-threshold (≤ -850 HU shown in green in b performs suboptimally compared to the convolutional neural network model (c) when compared to manual segmentation (blue outlines). HU Hounsfield unitsBack to article page