Quantify the Contractile Nature of Vessels Monitored under an Operating Microscope R package vmeasur version 0.1.4 A variety of tools to allow the quantification of videos of the lymphatic vasculature taken under an operating microscope. Lymphatic vessels that have been injected with a variety of blue dyes can be tracked throughout the video to determine their width over time. Code is optimised for efficient processing of multiple large video files. Functions to calculate physiologically relevant parameters and generate graphs from these values are also included. Software Depends: R (>= 2.10) Imports: ggplot2, readr, stringr, tidyr, purrr, ggpubr, imager, av, tools, dplyr, rlang, foreach, magrittr, graphics, stats, utils, pracma, crayon, svDialogs, pdftools, doFuture, progressr, future, scales, tcltk James JW Hucklesby <jhuc964@aucklanduni.ac.nz> Comprehensive R Archive Network (CRAN) James JW Hucklesby [aut, cre] (ORCID: <https://orcid.org/0000-0003-1591-6823>), Peter S Russell [aut] (ORCID: <https://orcid.org/0000-0002-7059-6618>), Anthony RJ Phillips [aut] (ORCID: <https://orcid.org/0000-0001-6143-5866>), Catherine E Angel [aut] (ORCID: <https://orcid.org/0000-0003-1737-8539>) CC BY-NC-SA 4.0 2021-11-11 application/tgz https://CRAN.R-project.org/package=vmeasur doi:10.32614/CRAN.package.vmeasur