Feasibility and early clinical assessment of flattening filter free (FFF) based stereotactic body radiotherapy (SBRT) treatments

Table 2 Summary of dose volume histogram analysis for PTV and healthy tissue

Parameter	All	Lung	Liver	Abdomen
PTV
Volume [cm ³ ]	78 ± 78	55 ± 55	146 ± 116	115 ± 82
Mean dose [%]	101.0 ± 2.9	101.2 ± 1.0	100.6 ± 1.6	100.3 ± 0.5
St. Dev. [%]	2.7 ± 0.6	2.9 ± 0.5	2.3 ± 0.8	2.1 ± 0.6
D _1% [%]	106.0 ± 1.8	106.8 ± 1.5	104.3 ± 1.6	104.4 ± 1.4
D _95% [%]	96.2 ± 1.0	96.1 ± 0.9	96.2 ± 1.5	96.4 ± 0.8
V _95% [%]	97.3 ± 1.9	97.1 ± 1.7	97.2 ± 3.0	97.9 ± 1.5
V ₁₀₇ [%]	1.5 ± 5.1	2.1 ± 6.0	0.1 ± 0.2	0.0 ± 0.1
Healthy tissue
Volume [cm ³ ]	30660 ± 8928	29283 ± 7493	36232 ± 13301	31510 ± 8805
Mean [Gy]	1.2 ± 0.7	1.1 ± 0.8	1.4 ± 0.3	1.3 ± 0.6
V _{10 Gy} [%]	3.3 ± 2.7	3.0 ± 3.0	4.0 ± 1.3	3.9 ± 2.4
CI _95%	1.2 ± 0.3	1.3 ± 0.3	1.2 ± 0.3	1.2 ± 0.3
*Dose Int. [Gycm** ³ *10 ⁴ ]	3.5 ± 2.1	3.1 ± 2.0	5.0 ± 2.1	4.1 ± 1.8

V _xGy : volume receiving at least × Gy. D _x% : dose received by at least x% of the volume. CI: Conformity Index

ISSN: 1748-717X