Evaluation of set-up deviations during the irradiation of patients suffering from breast cancer treated with two different techniques

Comparison of set-up errors by breast size on wing board by portal imaging

“…The majority of studies on setup errors in breast cancer comprise 20 patients or fewer, with various kinds of positioning devices, 9-12 hemibody cradles, 13,14 foam cushions, 15 3 In a study comparing patients undergoing tangential breast RT positioned supine on a wedge board with and without a fixed arm support, Mitine et al reported no differences in setup errors in the AP direction but overall setup errors as large as 15.5 mm in the CC direction were reduced to 5.5 mm with the fixed arm support. 9 In another study of 17 patients who underwent half of their tangential breast RT fractions using a breast board positioning device and the other half using a vacuum moulded device, Nalder et al reported that 80% of random error were 3 mm and 80% of systematic error in the AP direction were 4 mm with both techniques.…”

Set-up verification and 2-dimensional electronic portal imaging device dosimetry during breath hold compared with free breathing in breast cancer radiation therapy

“…Although the dosimetry data showed remarkably large deviations, differences in set-up errors between FB and vmDIBH were extremely small (sub-millimeter) and comparable with data reported earlier in FB patients. 19,20 Therefore, we consider vmDIBH to be as reproducible as standard FB techniques. Furthermore, we showed that by careful step-by-step introduction of vmDIBH, an easy, widely applicable procedure can be obtained.…”

Correction of systematic set-up error in breast and head and neck irradiation through a no-action level (NAL) protocol

“…Treatment set-up verifi cation of breast irradiation is usually based on matching bony anatomical landmarks, as visible on the electronic portal images, to the same anatomical landmarks visible in the DRRs [33][34][35][36][37][38][39][40]. Usually, portal images from the radiation fi elds are taken [33][34][35][36][37][38][39][40], although sometimes separate orthogonal additional beams are used, designed to check the isocentre [41].…”

“…Usually, portal images from the radiation fi elds are taken [33][34][35][36][37][38][39][40], although sometimes separate orthogonal additional beams are used, designed to check the isocentre [41].…”