ABSTRACT
As a consequence of the gantry rotation being an essential part of arc therapy, it is also essential that equipment used in the QA
Introduction ........................................................................................................................................ 343 Distinguishing Factors of QA for Volumetric Treatment ............................................................. 343 Equipment for Arc erapy QA Procedures................................................................................... 343 Commissioning and Acceptance Testing ........................................................................................ 344 Machine-Specic QA ......................................................................................................................... 345 Patient-Specic QA ............................................................................................................................ 346 QA for Arc erapy Treatment Planning ........................................................................................ 347 Summary ............................................................................................................................................. 347 References ............................................................................................................................................ 348
of these techniques is suited to handle gantry rotations. e QA program will include measurements performed while the gantry is rotating with the beam irradiating from all angles of rotation, and the equipment must therefore exhibit little or no angular dependence. Several of the major vendors of measurement equipment oer phantoms with built-in measurement arrays exhibiting little angular dependence of measurementthis includes the OCTAVIUS with 2D-ARRAY seven29 (PTW Freiburg GmbH), the MatriXXEvolution with MULTICube (IBA Dosimetry), the Delta4® (ScandiDos AB), and the ArcCHECK (Sun Nuclear Corporation). All these equipments consist of one or more measurement array(s)—ion chambers or diodes (or lm)—embedded in a solid phantom with rotational symmetry (see Figure 57.1).
