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Table 2 The mean HU values per PTV and percentage difference for dosimetric parameters between AXB vs AAA calculations. For 1–3 cm superior-inferior target motion, the dose difference for FB, AIP, MIP and PWD datasets is given via \( \Delta D=\left(\frac{D_{AXB}-{D}_{AAA}}{D_{AXB}}\right)x100\% \)

From: Technical and dosimetric implications of respiratory induced density variations in a heterogeneous lung phantom

Target range CT dataset <HU > ±sd ∆Dmax ∆D2% ∆Dmean ∆D95% ∆D98%
1 cm AIP -473 ± 223 −1.40 −1.40 0.06 −4.63 −4.80
FB −479 ± 246 −1.40 − 1.34 0.03 −4.39 − 5.22
MIP −370 ± 266 − 1.82 − 2.17 − 0.09 − 4.49 −4.79
PWD −472 ± 239 − 2.12 −2.52 − 0.33 −2.37 − 3.34
2 cm AIP − 503 ± 178 − 1.75 − 1.31 − 0.08 −5.07 − 5.43
FB −507 ± 227 − 0.91 − 0.50 0.23 − 4.92 − 6.73
MIP − 356 ± 259 − 1.91 − 2.15 −0.36 − 4.52 − 4.32
PWD − 490 ± 207 −1.40 − 1.37 −0.06 − 4.26 − 5.43
3 cm AIP −524 ± 143 −1.54 − 1.16 −0.23 −5.64 − 6.68
FB −569 ± 178 − 0.72 − 0.80 0.20 −3.26 − 3.71
MIP − 352 ± 249 − 2.14 −2.10 −0.62 −5.42 − 6.91
PWD −507 ± 208 − 1.98 − 1.87 − 0.37 −4.68 −5.28