Deep inspiration breath hold radiotherapy for locally advanced lung cancer: Comparison of different treatment techniques on target coverage, lung dose and treatment delivery time

Figures & data

Figure 1. Presentation of target coverage and lung dose for different treatment techniques in FB and DIBH: Above: target coverage presented as the relative volume receiving at least 95% (PTV95 and CTV95) or 99% (CTV99) of the prescribed 66 Gy. Below: relative lung volume Vx, where x is 5, 20 and 40 Gy, respectively. Data for RA plans with one arc is not presented.

Table I. MU and number of DIBH with different techniques.

	FB 3DC	DIBH 3DC	DIBH RA FF 6 MV	DIBH RA FFF 6 MV-2 arcs	DIBH RA FFF 6 MV-1 arc	DIBH RA FFF 10 MV-2 arcs	DIBH RA FFF 10-1 arc MV
MLD [Gy]	17.3 ± 6.6	14.7 ± 5.9*	14.0 ± 5.5*	13.6 ± 5.4*	14.3 ± 5.8*	13.9 ± 5.6*	14.3 ± 5.7*
V5 [%]	51.0 ± 23.6	44.6 ± 22.5*	56.6 ± 25.3*	54.3 ± 24.2	54.6 ± 24.8	54.7 ± 24.4	55.2 ± 24.4
V20 [%]	29.0 ± 12.2	24.9 ± 11.0*	24.2 ± 11.0*	23.6 ± 10.7*	26.4 ± 12.0	23.8 ± 11.5*	26.7 ± 11.8
V40 [%]	18.4 ± 6.8	15.6 ± 6.1*	10.3 ± 4.1*	10.1 ± 4.0*	9.7 ± 3.9*	10.0 ± 3.8*	9.5 ± 3.7*

*Indicates significant improvement compared to free breathing 3DC plan (p < 0.05), except for V5 for DIBH RA FF, where there is a significant decrease.