Fig. 7From: Stapler port position determination using 3-dimensional virtual simulation software in robot-assisted thoracic surgeryReceiver operating characteristic curve analysis to determine the optimal cut-off value of the VD (a), and AD (b) for predicting the stapling difficulty. VD: Virtual distance between the resection target vessel and stapler port place. AD: Actual distance between the resection target vessel and the anvil tip. AUC: Area under the curveBack to article page