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

Radiation Oncology

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 \( \Delta D=\left(\frac{D_{AXB}-{D}_{AAA}}{D_{AXB}}\right)x100\% \)

Target range	CT dataset	<HU > ±sd	∆D_max	∆D_2%	∆D_mean	∆D_95%	∆D_98%
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

ISSN: 1748-717X