[1] Kings Coll London, St Thomass Hosp, Div Imaging Sci & Biomed Engn, London SE1 7EH, England
[2] Guys & St Thomas NHS Fdn Trust, Dept Radiol, London, England
[3] Canc Res UK, Sutton, Surrey, England
[4] Inst Canc Res, EPSRC Canc Imaging Ctr, Sutton, Surrey, England
[5] Royal Marsden NHS Fdn Trust, Sutton, Surrey, England