Publications by authors named "W Gebreamlak"
The aim of this study is to determine the planar dose distribution of irregularly-shaped electron beams at their maximum dose depth () using the modied lateral build-up ratio (LBR) and curve-fitting methods.Circular and irregular cutouts were created using Cerrobend alloy for a 14 × 14 cmapplicator. Percentage depth dose (PDD) at the standard source-surface-distance (SSD = 100 cm) and point dose at different SSD were measured for each cutout.
View Article and Find Full Text PDFPurpose: To calculate the output factor (OPF) of any irregularly shaped electron beam at extended SSD.
Methods: Circular cutouts were prepared from 2.0 cm diameter to the maximum possible size for 15 × 15 applicator cone.
Purpose: To calculate the percentage depth dose (PDD) of any irregularly shaped electron beam using a modified lateral build-up ratio (LBR) method.
Methods: Percentage depth dose curves were measured using 6, 9, 12, and 15 MeV electron beam energies for applicator cone sizes of 6 × 6, 10 × 10, 14 × 14, and 20 × 20 cm(2). Circular cutouts for each cone were prepared from 2.
Purpose: To quantify the change, if any, in flexmap correction factors and image quality with the XVI system over a course of several years and from these results, assess their clinical impact.
Methods: Flexmap, a calibration procedure which corrects for imperfect gantry rotation for cone-beam CT reconstruction, and image quality tests were performed on three Elekta Synergy linacs equipped with XVI. Data was collected per month over three years.
Purpose: To calculate the percentage depth dose of any irregular shape electron beam using modified lateral build-up-ratio method.
Method And Materials: Percentage depth dose (PDD) curves were measured using 6, 9, 12, and 15MeV electron beam energies for applicator cone sizes of 6×6, 10×10, 14×14, and 14×14cm . Circular cutouts for each cone were prepared from 2.