= Andreas M. Koehler
{c}
= Andreas Koehler
{c}
{synonym}
= A. M. Koehler
{c}
{synonym}
An experimental <physicist> whose work helped make broad treatment fields for <proton therapy>. His 1977 study describes spreading a narrow <proton> beam by <multiple scattering>, blocking part of its central intensity peak, and scattering again to fill the profile. The resulting flatter <absorbed dose> distribution makes a useful field cover a larger region rather than concentrating the beam at its center. This is an example of designing the beam-delivery apparatus around the intended dose pattern.<Flattening of proton dose distributions for large-field radiotherapy by Andreas M. Koehler and others>[Abstract: central-peak blocking, rescattering and flat dose profiles over large fields]{ref}
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