Case Report

Early Experience of Helical Tomotherapy for Hepatobiliary Radiotherapy

Table 2

Dosimetric constraints for each organ at risk: recommended dose-volume limits from Quantec [15] and French guidelines [16].

Normal liverMedian dose <28 Gy (in 2-Gy fractions)
V30 < 50% a

Right kidneyMaximum dose of 20 Gy to the total kidney
Mean dose < 18 Gy a
Right lungV20 < 20% a
Spinal cordMaximum dose of 45 Gy

a Vx: Percentage of the organ at risk receiving more than x dose.