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Clinical use of electronic portal imaging to analyse tumor motion variation during a 3D-conformal prostate cancer radiotherapy using online target verification and implanted markers George Felix Acquah1* , Magnus Gustavsson 3 , Chris Osam Doudoo1, Richard Agbeve1, Bernhard Schiestl1,2 1 Sweden Ghana Medical Centre, Radiation Oncology Department, P.O.Box CT 3286, Cantonments, Accra, Ghana. 2 Department of Therapeutic Radio Oncology, University Hospital of Innsbruck, Innsbruck, Austria. 3 Sahlgrenska University Hospital, Department of Medical Physics, Gothenburg, Sweden. *Tel: +233 243 541 320 *Email: [email protected] Acknowledgements This manuscript is based on work done at the Sweden Ghana Medical Centre, Accra, Ghana from March 2012 to April 2014. We wish to express our gratitude to our oncologists (especially Olof Stahl, Jens Engleson and Hannah Simonds), dosimetrists, radiotherapists (especially Eva Zuiderveld, Maud Bempeh, Promise Ahiagbenyo and Charne Martin), radiographers, and other members of the Oncology team of SGMC for their contributions towards this work. This work is also dedicated to the memory of the late Mr. Emmanuel Kwaku Nani (a pioneer of Medical Physics in Ghana).