Irregular field dose determination with the weighted beam-zone method

Simple Proposal for Dosimetry with an Elekta iViewGTTM Electronic Portal Imaging Device (EPID) Using Commercial Software Modules

“…The graph of the EPID reveals a steeper slope. This implies different scattering characteristics of the EPID, which has to be adjusted with a correction factor for each pixel, e.g., based on the beam-zone method [19] and the difference between the output factors of the EPID and the reference system.…”

In Vivo Dosimetry with Semiconducting Diodes for Dose Verification in Total-Body Irradiation

“…Primarily, this calculation was developed for calibration of dose monitoring in case of irregular irradiation fields. Each field was divided into sectors with a fixed dose value contributing to the central point of the field [15]. Considering the translation method in TBI, the number of sectors represents the patient's body surface definitively treated, and the total dose to the central point in the irradiation field, respectively [14].…”

“…Up to now, there are no computer-based planning systems available to calculate a three-dimensional treatment plan and a dose distribution for this translation technique. Based on the beam-zone method published by Quast and Quast & Glaeser [14,15], dose distribution has to be conventionally calculated in a few points of interest. However, the dose distribution is expected to be inhomogeneous due to variations in the patient's diameter and the local effective field size.…”