Villafana T, Lee S H, Lapayowker M S
J Comput Assist Tomogr. 1978 Jul;2(3):368-71. doi: 10.1097/00004728-197807000-00028.
A device was designed that makes possible direct anatomical correlation between the computed tomography scan and radiographic scout films. The acrylic-air groove approach used here eliminates the possibility of producing image degrading artifacts as is common with catheter type markers.