Purpose: To improve patient safety and treatment quality, verification of dose delivery in radiotherapy is desirable. We present a simple, easy-to-implement, open-source method for planar dosimetry of conformal radiotherapy by electronic portal imaging device (EPID).
Methods: Correlation ratios, which relate dose in the mid-depth of slab phantoms to transit EPID signal, were determined for multiple phantom thicknesses and field sizes.
Purpose: We recently developed a novel, open-source dosimetry that uses the electronic portal imaging device to detect dose delivery discrepancies. We applied our method on patients with rectal cancer treated on a belly board device.
Methods: dosimetry was performed on 10 patients with rectal cancer treated prone on the belly board with a 4-field box arrangement.