In Group A, mean doses to liver were increased with RA vs IMRT (22.9 Gy vs
22.2 Gy, p50.0275). However, V30 Gy of liver was lower in RA vs IMRT (31.1% vs 32.1%,
p50.0283). In Group B, in contrast, neither mean doses nor V30 Gy of liver significantly
differed between the two plans. V35 Gy of duodenum and V20 Gy of kidney were
decreased with RA in Groups A and B, respectively (p50.0058 and 0.0124, respectively).
Both maximal doses to spinal cord and monitor unit were significantly lower in the RA
plan, regardless of the group.
Conclusion: The dose-volumetric results of RA vs IMRT were different according to the
different target location within the liver. In general, RA tended to be more effective in
the sparing of non-liver organs at risk such as duodenum, kidney, and/or spinal cord.
Moreover, RA was more efficient in the treatment delivery than IMRT in terms of total
monitor unit used.