Design of compensators for breast radiotherapy using electronic portal imaging

Evaluation of Calculation Algorithms Implemented in Different Commercial Planning Systems on an Anthropomorphic Breast Phantom Using Film Dosimetry

“…There are a lot of existing treatment techniques for breast cancer [15,25,31,[33][34][35]37] but the most common technique still uses two tangential wedged fields [36]. The accuracy of the dose prediction in targets in or close to the lung strongly depends on the type of algorithm used [14,16].…”

Use of a megavoltage electronic portal imaging device to identify prosthetic materials

“…Previous works have used the MV treatment beam of a linear accelerator and its electronic portal imaging device (EPID) to measure radiological thickness for varying purposes such as patient compensator design [12][13][14] and monitoring of patient position and weight loss [15,16]. This study establishes a methodology that determines the RED of an unknown material using the megavoltage treatment beam and EPID.…”

A dual two dimensional electronic portal imaging device transit dosimetry model based on an empirical quadratic formalism

“…[12][13][14][15][16][17][18] Instead of using the convolution approach, an empirical method is more practical for the majority of clinical centres with limited resources for computationally intensive simulations or mathematical modelling. 2D transit dosimetry using an empirical method was first described by Evans et al 19 and Symonds-Tayler et al 20 for an in-house imaging panel and later by Evans et al 21 for a commercial scanning liquid-filled ionization chamber (SLIC) EPID. The technique used a quadratic equation established by Swindell 22 and was based on a calibration method described by Morton et al 23 to derive coefficients for the conversion of EPID pixel value to equivalent path length (EPL).…”

“…Different from previous studies, [19][20][21][23][24][25] in addition to deriving quadratic equation coefficients from EPID-measured dose planes, coefficients were also derived from ionization chamber (IC) dose planes measured in water. Therefore, in the current model, EPL can be calculated using input from both EPID as well as TPS, which is conventionally modelled based on water measurements.…”