Table 1.

Summary of patient characteristics. Target volume data represent median (minimum volume ~ maximum volume).

Number of patients	24 patients (25 plans)
‐ single target	‐ 16 patients
‐ 2 ~ 4 targets	‐ 6 patients
‐ $>4\hspace{0.17em}\text{targets}$	‐ 2 patients
‐ circular shape	‐ 18 plans
‐ irregular shape of target or abutting with OARs	‐ 7 plans
‐ $\text{target volume}\le 1{\text{cm}}^3$s	‐ 7 plans
‐ $1{\text{cm}}^3<\text{target volume}\le 5{\text{cm}}^3$	‐ 9 plans
‐ $\text{target volume}>5{\text{cm}}^3$	‐ 9 plans
Target volumes (cm3)	$2.5(0.09\sim 47.0)$
‐ single target	$-2.3(0.3\sim 47.0)$
‐ multiple targets	$-2.7(0.09\sim 29.4)$
‐ circular shape	$-2.2(0.09\sim 11.1)$
‐ irregular shape of target or abutting with OARs	$-11.1(0.3\sim 47.0)$
‐ $\text{target volume}\le 1{\text{cm}}^3$	$-0.3(0.09\sim 0.6)$
‐ $1{\text{cm}}^3<\text{target volume}\le 5{\text{cm}}^3$	$-2.3(1.2\sim 4.4)$
‐ $\text{target volume}>5{\text{cm}}^3$	$-14.7(9.1\sim 47.0)$

$\text{OAR}=\text{organ at risk}$