This dataset contains greyscale normalised TIF images from X-Ray Computed Tomography (XCT) scanning of a unidirectional carbon fibre epoxy laminate with at total void volume of around 2%. Combinations of scan times, from 30 seconds to 60 minutes, and voxel sizes, from 6 to 50 µm, were investigated for their effect on the porosity measurements. The data were obtained and analysed according to the methods described in the paper "The Effect of X-Ray Computed Tomography Scan Parameters on Porosity Assessment of CFRP Laminates" by P Galvez-Hernandez, R Smith, K Gaska, M Mavrogordato, I Sinclair, and J Kratz, which was published in the Journal of Composite Materials.