Patent 7510325 was granted and assigned to National Institute of Radiological Sciences on March, 2009 by the United States Patent and Trademark Office.
A phantom assembly includes a plurality of cylindrical shaped phantoms connectable to each other and/or a plurality of column-shaped phantoms connectable to each other with fitting portions. An x-ray radiation measuring device for measuring an x-ray radiation from an x-ray CT device is inserted in a through-hole of the phantom.