Development of a protocol for small beam bi-dimensional dose distribution measurements with radiochromic films

摘要

Gafchromic (TM) films have become popular due to their ease of use and their near water equivalence. This last property is crucial for stereotactic small beam dosimetry as demonstrated in recent papers. An accurate bi-dimensional dose measurement with Gafchromic (TM) films is very challenging mainly because of the non-uniformity response of flatbed scanners (used for films digitalization) and their own non uniformity. The first proposal of this work is to develop bi-dimensional protocol for small beams and evaluate the associated uncertainty. The second proposal is to validate this protocol for the bi-dimensional measurements of treatment plans performed with the CyberKnife (R) system.