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Table 2 Systematic error M, its standard deviation Σ, and random error σ for the relative dose difference (D evalD ref)/D ref, where D eval is the evaluation dose (calculated by the TPS) and D ref is the reference dose (measured using the radiochromic film), calculated for a group of 10 patients in three media with different electronic densities and separately for two different treatment planning techniques, conventional 3D CRT and DCAT

From: Treating lung cancer with dynamic conformal arc therapy: a dosimetric study

Medium M (%) Σ (%) σ (%)
  3D CRT DCAT 3D CRT DCAT 3D CRT DCAT
Bone -4.300 -2.400 2.177 1.154 4.749 1.218
Soft tissue 1.597 1.191 2.620 1.275 3.389 1.567
Lung 1.004 0.208 0.881 1.442 2.574 1.408