10.1371/journal.pone.0095250.g001 N. Jon Shah N. Jon Shah Hans Herzog Hans Herzog Christoph Weirich Christoph Weirich Lutz Tellmann Lutz Tellmann Joachim Kaffanke Joachim Kaffanke Liliana Caldeira Liliana Caldeira Elena Rota Kops Elena Rota Kops Syed M. Qaim Syed M. Qaim Heinz H. Coenen Heinz H. Coenen Hidehiro Iida Hidehiro Iida Point source phantom. Public Library of Science 2014 biotechnology Bioengineering Biomedical Engineering neuroscience neuroimaging physics Diagnostic medicine Diagnostic radiology tomography Positron emission tomography Magnetic resonance imaging Radionuclide imaging neurology Radiology and imaging 2014-04-22 09:41:19 Figure https://plos.figshare.com/articles/figure/_Point_source_phantom_/1072429 <p>The block of polyethylene foam consists of two halves whereby on the inner surface of one half, a disk-shaped protrusion fits into a disk-shaped recess on the other. A radioactive drop is placed right in the centre of the cubic block of polyethylene foam with a density of 0.1 g/cm<sup>3</sup>.</p>