Fig. 1.

Methods for laparoscopic bowel length measurement (LBLM). A Visual judgment: bowel length is measured by mere visual estimation without a measurement tool. B Use of instrument markings: bowel is measured in 5 cm increment marks (letter “K” = 5 cm distance from instrument tip) on laparoscopic instruments. C Use of premeasured tape: bowel is handled along with premeasured tape of a specific length (here 35 cm). D Use of computer-assisted 3D bowel measurement system: bowel length is measured by a computer after pressing a foot switch and displayed to the surgeon in augmented reality as a measurement line between the instruments (blue line), as well as in a circle displaying both partial (blue) and total (white) measurements