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                <gco:Boolean>false</gco:Boolean>
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      <gmd:lineage>
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            <gco:CharacterString>The dynamic concentration profiles in the PET images represent the movement of the solute-plume following the injection of a pulse of radio-tracer into the porous medium. Upon decay, the radio-tracer emits positrons, which are continuously acquired across the entire axial field-of-view of the scanner (~ 12 cm for INVEON DPET and 22 cm for Biograph 64 PET/CT). The inlet and outlet locations of each sample were identified as the first and last slice where the tracer was observed to distribute over the entire cross section of the cylindrical sample. The images have been reconstructed by using filtered-back projection in the case of BP and 3D ordered subsets expectation maximisation, in the case of KL. The concentration voxel values are given as decay-corrected radioactivity intensity. The dataset for BP is provided in DICOM format, while the images for KL are given as IMG file.</gco:CharacterString>
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        </gmd:LI_Lineage>
      </gmd:lineage>
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