Table 2.

The QA results of 11 VMAT plans using ArcCHECK and ${\text{Delta}}^4$ phantoms obtained without introducing any setup error

		γ (%) a of ArcCHECK			γ (%) a of ${\mathit{\text{Delta}}}^4$
Cancer Site	$3\%/3\hspace{0.17em}\text{mm}$	$3\%/2\hspace{0.17em}\text{mm}$	$2\%/2\hspace{0.17em}\text{mm}$	$3\%/3\hspace{0.17em}\text{mm}$	$3\%/2\hspace{0.17em}\text{mm}$	$2\%/2\hspace{0.17em}\text{mm}$
Esophageal	$98.5\pm 0.3$	$96.8\pm 0.4$	$91.2\pm 0.7$	$99.7\pm 0.3$	$98.2\pm 1.0$	$95.3\pm 1.7$
Prostate	98.7	97.5	92.9	98.6	96.5	90.6
Cervix uteri	98.5	97.2	91.4	99.2	98.0	92.9
Rectal	$98.8\pm 0.9$	$97.2\pm 1.8$	$93.6\pm 2.4$	$99.4\pm 0.4$	$97.8\pm 1.2$	$95.8\pm 1.0$
NPC	$95.6\pm 0.8$	$92.5\pm 0.9$	$84.7\pm 1.0$	$98.5\pm 0.5$	$95.3\pm 1.9$	$90.1\pm 2.0$

^aGamma (γ) results are the percentage of points passing the gamma criterion of $3\%/3\hspace{0.17em}\text{mm},3\%/2\hspace{0.17em}\text{mm}$, and $2\%/2\hspace{0.17em}\text{mm}$, respectively.