title: A Response to Dr. Zhang and Dr. Rubin.
authors.affiliation: Medical Research Institute, Ninewells Hospital and Medical School, Mailbox 4, Dundee DD1 9SY, UK; Image Science for Interventional Techniques, University of Clermont Auvergne, Bâtiment 3C, Faculté de Médecine, Clermont-Ferrand, France.
authors.forename: Katrin
authors.initials: K
authors.lastname: Skerl
authors.affiliation: Medical Research Institute, Ninewells Hospital and Medical School, Mailbox 4, Dundee DD1 9SY, UK.
authors.forename: Sarah
authors.initials: S
authors.lastname: Vinnicombe
authors.affiliation: Image Science for Interventional Techniques, University of Clermont Auvergne, Bâtiment 3C, Faculté de Médecine, Clermont-Ferrand, France.
authors.forename: Andrew
authors.initials: A
authors.lastname: Evans