Advanced, multiple-projection, dual-energy x-ray absorptiometry system: Precision bone loss measurements on earth and in space

Advanced, multiple-projection, and dual-energy X-ray Absoroptiometry (AMPDXA) project was undertaken to perform precision bone loss (PBL) measurements on Earth and in space. The project was a joint effort by a team from APL and JHU School of Medicine. The effort continued from 1998-2007 and was funded by the National Space Biomedical Research Institute (NSBRI). It produced technical results, including demonstration of the precision accuracy afforded by the 3-D multiple-projection technique. It focused on demonstrating that multiple projection was removed or minimized patient-positioning error. The demonstrations of the project were used on humans and its radiation levels were significantly lower than that of a computer-aided tomography.