The impact of ensemble learning on surgical tools classification during laparoscopic cholecystectomy

Laparoscopic surgery also know as minimally invasive surgery (MIS), is a type of surgical procedure that allows a surgeon to examine the organs inside of the abdomen without having to make large incisions in the skin. It unifies the competence and skills of highly trained surgeons with the power and precision of machines. Furthermore, surgical instruments are inserted through the abdomen with the help of a laparoscope, which is a tube with a high-intensity light and a high-resolution camera at the end. In addition, recorded videos from this type of surgery have become a steadily more important information source. However, MIS videos are often very long, thereby, navigating through these videos is time and effort consuming. The automatic identification of tool presence in laparoscopic videos leads to detecting what tools are used at each time in surgery and helps in the automatic recognition of surgical workflow. The aim of this paper is to predict surgical tools from laparoscopic videos using three states of the arts CNNs, namely: VGG19, Inception v-4, and NASNet-A. In addition, an ensemble learning method is proposed, combining the three CNNs, to solve the tool presence detection problem as a multi-label classification problem. The proposed methods are evaluated on a dataset of 80 cholecystectomy videos (Cholec80 dataset). The results present an improvement of approximately 6.19% and a mean average precision of 97.84% when the ensemble learning method is applied.