[1] Kings Coll London, St Thomas Hosp, Div Imaging Sci & Biomed Engn, London SE1 7EH, England
[2] Univ Nottingham, Sch Chem, Nottingham NG7 2RD, England
[3] Aston Univ, Sch Engn & Appl Sci, Birmingham B4 7ET, W Midlands, England
[4] CROmed Ltd, H-1047 Budapest, Hungary
[5] Kings Coll London, Dept Phys, London WC2R 2LS, England
[6] Semmelweis Univ, Dept Biophys & Radiat Biol, Nanobiotechnol & Vivo Imaging Ctr, H-1094 Budapest, Hungary
[7] Kings Coll London, Div Chem, London SE1 1DB, England