Dieser Effekt beruht auf der erst ab der Haut eintretenden Rekrutierung von Streustrahlung.
Auf dem weiteren Weg in Richtung Tumor fällt die Strahlendosis dann steil in Form einer Exponentialkurve ab.
Der charakteristischerweise in der Körpertiefe liegende Tumor erhält somit weniger Dosis als Gewebe im Strahlengang „ upstream ” vor ihm, hinter dem Tumor liegende Organe ( z. B. Rückenmark, Sehnerven, Hirnteile ) erhalten immer noch die Dosisschleppe „ downstream ”.
www.rptc.deThe maximum dosage is delivered just under the skin because scattered radiation is recruited only at the skin.
As the radiation continues to penetrate toward the tumor, the radiation dosage declines exponentially.
Tumors are typically located deep within the body so they are exposed to a smaller dose of radiation than tissue situated upstream in the path of the beam, and organs located behind the tumor ( such as the spine, optic nerve, and parts of the brain ) always receive the downstream penumbra.
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