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. 2022 May 17;21:15330338221100231. doi: 10.1177/15330338221100231

Table 2.

Achieved Average Dosimetric Indices, Beam-on Times and the Associated P-Values for the X1 10 mm Jaw (X1-10), X1 20 mm Jaw (X1-20), and Eclipse VMAT Plans for Head and Neck, Prostate, and Lung SBRT Sites. A P-Value 0.05 was Considered Significant (Bold Text).

Site Dosimetric constraint/parameter X1-10 X1-20 Eclipse P (X1-10 vs Eclipse) P (X1-20 vs Eclipse) P (X1-10 vs X1-20)
Head and neck PTV_high D95% 100% 100.7 100.8 100.0 .06 .06 .45
PTV_intermed D95% 100% 102.3 102.0 101.4 .10 .06 .27
PTV_low D95% 100% 100.5 101.0 99.8 .09 .06 .25
PTV_high D2%<106% 104.7 105.7 104.4 .35 .03 .07
BrainStem Dmax<54 Gy 17.7 21.5 28.1 .003 .03 .07
Cochlea_ipsi Dmean<45 Gy 18.3 18.8 26.2 .02 .02 .36
Glottis Dmean<25 Gy 9.4 10.4 13.1 .04 .08 .02
Lips Dmax<30 Gy 20.0 20.3 24.2 .01 .004 .22
Parotid_contra Dmean<26 Gy 12.3 13.6 11.1 .22 .06 .01
Pharynx Dmean<45 Gy 25.1 26.5 24.7 .39 .10 .09
SpinalCord Dmax<45 Gy 18.8 20.3 22.3 .12 .31 .25
Submand_contra Dmean<39 Gy 20.8 19.3 23.4 .09 .05 .15
TempLobe_contra Dmax<60 Gy 9.6 11.0 7.4 .15 .08 .04
Beam-on Time, min 11.9 8.3 2.0 <.001 <.001 <.001
Prostate PTV_80 D95% 80 Gy 80.1 80.5 80.0 .10 .06 .11
PTV_80 D2%<106% 105.7 105.3 105.1 .08 .34 .24
Bladder V80<15% 7.5 8.2 8.0 .05 .36 .10
Bladder V65<50% 13.9 16.4 14.2 .21 .05 .03
Femur_L Dmax<50 Gy 35.5 36.3 40.3 .003 .01 .23
Femur_R Dmax<50 Gy 35.9 36.4 41.0 .001 .01 .31
PenileBulb, Dmean<52.5 Gy 27.1 37.8 25.9 .06 .01 .01
Rectum V75<15% 9.7 11.0 11.3 .01 .38 .04
Rectum V60<35% 19.9 22.0 21.0 .18 .29 .05
Beam-on Time, min 8.6 5.3 2.0 <.001 <.001 <.001
Lung SBRT PTV_50 D95% 50 Gy 50.8 50.5 50.0 .08 .06 .10
PTV_50 D2%<135% 124.8 121.7 123.9 .37 .10 .08
CI<1.2 1.0 1.0 1.0 .16 .17 .44
R50 5.7 6.5 5.2 .20 .03 .02
Chestwall Dmax<52.5 Gy 43.4 41.3 41.9 .31 .41 .04
Lungs VS12.4>1000cc 2967.8 2930.3 2867.4 .17 .26 .001
Lungs VS11.6>1500cc 2950.0 2909.5 2850.1 .17 .28 .001
Lungs V20<10% 3.2 3.7 3.2 .47 .10 .002
SpinalCord Dmax<14 Gy 8.3 8.2 7.0 .09 .09 .33
Beam-on Time, min 22.7 14.4 1.3 <.001 <.001 <.001