?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.aufirst=TP&rft.au=Millard%2C+TP&rft.aulast=Millard&rft.date=9+September+2013&rft.issn=0003-6951&rft.issue=11&rft.atitle=Quantification+of+microbubble+concentration+through+x-ray+phase+contrast+imaging&rft.volume=103&rft.title=Applied+Physics+Letters&rft.genre=article