="headerlink" href="#fff-algorithms" title="Link to this heading">Â¶</a></h1>
<p>For FFF beams the standard interpolated or dose level parameters do not give good results. FFF fields are sharply peaked and the FWHM (50% dose level) is not a good indicator of the collimator field size. For FFF beams the inflection point (the point where the slope of the penumbra is greatest) of the penumbra has been proposed to represent the field edge.</p>
<p>While the maximum slope of the penumbra can be calculated direc