1. File List: There are two different types of files contained in 41 folders: Files corresponding to regular samples Total number of folders: 40 Folder names take the following format: Test_MAT_POR_MUES_barr2d In bold letters there three variables appear describing the measurement contents in them: • MAT can be either al (aluminium) or al2o3 (alumina) which correspond to the material of the particles used for the phantom • POR can be either 1por, 2por, 4por, 6por or 8por, and describes the mass concentration of particles in the samples • MUES can be either mues1, mues2, mues3 and mues4, and correspond to the number of the sample measured, as 4 different samples were produced for each material. Inside each folder a number of approximately 45 files with the extension *.mat are contained. Each file contains the information of ultrasound scan signals with the transducer successive being approached to the material, so the scans cover the whole material thickness. All these files are named as the folder where they are with an extension: Folder_N.mat, where N is number between 1 and 47, (the last number is variable depends on the sample thickness), where 1 correspond to the maximum distance between transducer and sample and the highest number to the minimum distance. Files corresponding to the compounded sample It is just one folder (Mic_V1i_1) containing 61 files named as Mic_V1i_1_N.mat, where N is a number from 1 to 61, where the first and last one refers to the maximum and minimum distance between transducer and samples respectively.

This dataset contains ultrasound backscattered signals in the range 20-70MHz from tissue mimicking materials based on Poly-vinyl Alcohol (PVA) charged with particles. This dataset was obtained to evaluate quantitative ultrasound techniques for tissue characterization. The ultrasound system used to obtain data was based on a single-channel transducer pulse-echo configuration performing linear scans. The transducer used has a wide band covering frequencies from 20 MHz up to 70 MHz. This spherically focalized transducer features a 10 mm curvature radius and a 6 mm diameter active element. Materials were evaluated at depths up to 6mm.

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