This repository contains sequences of CT images of the two-phase flow in a bubble column consisting of a DN100-PN4 PVC pipe filled with water. As measurement system the ultrafast electron beam X-ray computed tomography scanner was applied in dual plane scanning mode with a dual-imaging frequency of 2,000 Hz. Data containers starting with “SingleBubble” contain image sequences of scans where a single bubble was injected at the bottom of the column using a magnetically operated valve which was open for the time specified in the directory name. Data containers starting with “PolydisperseStatic” contain image sequences of scans where a background flow with 01 to 20 sl/min was induced via a needle sparger in addition to the single bubble (as described before). During each “PolydisperseStatic” scan, the scanning position was fixed at "Hxxx" [mm]. The HDF5 files hold the reconstructed image data (dataset “reco”), each images scanning plane (dataset “plane”), and each images vertical scan position (dataset “scanPosition”).