Quality assurance and application of a 4D in vivo dosimetry system using a deformable lung phantom

Abstract

A novel 4D in-vivo dosimetry detector (RADPOS) in conjunction with a deformable lung phantom has been used as a quality assurance tool for 4D radiotherapy. A treatment plan was created and delivered with the phantom in two breathing states and the RADOS system was used to verify dose and displacement of the tumour and lung volumes. The RADPOS measured the movement within a maximum deviation of 1.5 mm, and the dose within 4.2% of the total dose. The latest quality assurance and characterization tests of the RADPOS 4-D in-vivo dosimetry system are also presented in this work. © 2009 Springer-Verlag.