Conventional external beam radiotherapy
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Conventional external beam radiotherapy (2DXRT) is delivered via two-dimensional beams. 2DXRT mainly consists of a single beam of radiation delivered to the patient in four static directions: front, back, and both sides. Conventional refers to the way the treatment is simulated on a specially calibrated conventional diagnostic x-ray machine (or sometimes by eye), and to the usually well established arrangements of the radiation beams to achieve a desired plan. The aim of simulation is to accurately target or localize the volume that is to be treated. This technique is well established and is generally quick and reliable. The worry is that some high-dose treatments may be limited by the radiation toxicity capacity of healthy tissues that lay close to the target tumor volume.