EP-1804: A comparative analyse of prostate positioning guided by transperineal 3D ultrasound and cone beam CT

M. Li, H. Ballhausen, N.S. Hegemann, M. Reiner, S. Tritschler, F. Manapov, U. Ganswindt, C. Belka
2016 Radiotherapy and Oncology  
ESTRO 35 2016 S845 ________________________________________________________________________________ imager separately. To access these information, we applied a method previously used for QA of Elekta linac gantry heads and portal-imaging systems. Material and Methods: The sag pattern of the CBCT unit of an Elekta linac was investigated using five tungsten-carbide ball-bearings of diameter 4.8 mm. One ball-bearing was attached to the treatment couch top and four were attached to the kV source.
more » ... to the kV source. Image acquisition was carried out for smallfield of view with an average of 343 planar images in each gantry rotation. An in-house software coded in MATLAB was used to extract the ball-bearing positions in the images and to calculate the sag patterns of the CBCT unit.
doi:10.1016/s0167-8140(16)33055-9 fatcat:kviz6tfbnrg5jl3n6rs2xar2h4