Dose Verification in Intensity Modulation Radiation Therapy: A Fractal Dimension Characteristics Study

Figure 5

When these two dose distributions are normalized at their cross hair isocenter, the 88% region of the interested planning isodose curve’s Ds is 1.9852, and the 88% region of the interested film isodose curve’s Ds is 1.9841. The discrepancy is only 5×10⁻⁴[(1.9852−1.9841)/1.9852]. The planning 88% isodose curve and film 88% isodose curve are supposed to be identical if the difference between their Ds values is within 1%.

(a)

(b)