Conventional External Beam Radiation Therapy EBRT

In the 1970s, the treatment field size and portal configuration for radiation therapy were based on estimations of the anatomic boundaries of the prostate defined by plain-film radiography and by the digital rectal examination. At that time, a variety of treatment techniques were used. In general, four fields were used to treat the pelvis and prostate to an initial dose of 45 Gy, with a boost to 70 Gy to the prostate only [1, 2]. Early conventional external beam radiation therapy used total doses in the range of 60 to 70 Gy, because it was believed that this dose was close to the maximum dose allowed by the surrounding normal tissues, especially rectum. Today, it is obvious that this dose is not sufficient to get an adequate local control rate.

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