Design of cone-beam CT for proton therapy gantry
Résumé
Purpose/Objective: Cone-beam CT is widely used in radiation therapy proving tremendous interest for patient positioning and daily monitoring of anatomical modifications. Moreover, the use of volumetric imaging can contribute to a more accurate location of the target volume which is important in proton therapy (PT) where sharp dose gradients are used. Despite this potential advantage, integrating a CBCT on a PT gantry has not already been done and poses additional challenges such as potentially larger geometrical deformations compared to a LINAC (Table 1). In this paper, we describe how the first CBCT has been implemented in a PT gantry.The general design, choice of hardware, and software implementation are outlined and results on a phantom demonstrate the possibilities of the system.