An official website of the United States government
The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before
sharing sensitive information, make sure you’re on a federal
government site.
The site is secure.
The https:// ensures that you are connecting to the
official website and that any information you provide is encrypted
and transmitted securely.
Ravi A, Keller BM, Pignol JP.Ravi A, et al. Among authors: keller bm.Med Phys. 2011 Nov;38(11):6046-52. doi: 10.1118/1.3651633.Med Phys. 2011.PMID: 22047369
Ravi A, Caldwell CB, Keller BM, Reznik A, Pignol JP.Ravi A, et al. Among authors: keller bm.Phys Med Biol. 2007 Oct 7;52(19):5921-32. doi: 10.1088/0031-9155/52/19/013. Epub 2007 Sep 17.Phys Med Biol. 2007.PMID: 17881809