Simultaneous integrated boost therapy of carcinoma of the hypopharynx/larynx with and without flattening filter - a treatment planning and dosimetry study

Table 2 Comparison of delivery

Parameter	IMRT FF	IMRT FFF	VMAT FF	VMAT FFF
Passing Rate of Gamma Evaluation (%)	98.5 ± 1.3	97.6 ± 2.0	98.6 ± 0.9	98.9 ± 0.9
Delivery Time (min:s)	9:27 ± 0:34	9:49 ± 0:28	2:52 ± 0:07	2:53 ± 0:05
Measured Peripheral Dose 30 frac (mGy)	209 ± 36	170 ± 34	155 ± 42	*127 ± 38*
Monitor Units	859 ± 70^a	1181 ± 120	571 ± 63^a	694 ± 59
Segments (IMRT)	71 ± 4^a	79 ± 3	-	-

Mean values and standard deviation of delivery time, monitor units and segments for FF and FFF mode averaged over all patients. Bold values indicate statistically significant superior values in the comparison of FF vs FFF. Bold-italic values indicate best values in the comparison of all planning techniques and irradiation modes. ^a indicates statistical significance in the comparison of FF vs FFF without judgement, since the number of monitor units and the number of segments are no measures of quality

ISSN: 1748-717X