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Table 3 All differences among three methods with regard to the DVH-parameters

From: Volumetric intensity-modulated Arc (RapidArc) therapy for primary hepatocellular carcinoma: comparison with intensity-modulated radiotherapy and 3-D conformal radiotherapy

  P value
  Overall IMRT vs 3DCRT IMRT vs RA RA vs 3DCRT
CTV     
V95% (%) 1.00 -- -- --
PTV     
V95% (%) 1.00 -- -- --
V100% (%) 1.00 -- -- --
V107% (%) 0.016 -- RA < IMRT * RA < 3DCRT *
CI 0.004 IMRT < 3DCRT * RA < IMRT * RA < 3DCRT *
HI 0.69 -- -- --
Normal liver     
Dmean (Gy) 0.001 IMRT < 3DCRT * IMRT < RA * --
V40 Gy (%) 0.004 IMRT < 3DCRT ** -- RA < 3DCRT *
V30 Gy (%) 0.004 IMRT < 3DCRT ** -- RA < 3DCRT *
V20 Gy (%) 0.004 IMRT < 3DCRT ** IMRT < RA * --
V10 Gy (%) 0.007 -- IMRT < RA ** 3DCRT < RA *
NTCP 0.002 IMRT < 3DCRT ** -- RA < 3DCRT *
Stomach Dmean (Gy) 0.121 IMRT < 3DCRT * -- --
Left Kidney Dmean (Gy) 0.085 IMRT < 3DCRT * -- --
Right Kidney Dmean (Gy) 0.217 -- -- --
Spinal Cord D1% (Gy) 0.236 -- -- --
MU 0.001 3DCRT < IMRT ** RA < IMRT ** --
  1. p < 0.05; ** p < 0.01
  2. PTV: planned tumor volume; Vx%: the volume receiving ≥ x% of the prescribed dose; VnGy: the percentage of organ volume receiving ≥ n Gy; CI: conformity index; HI: homogeneity index; Dmean: the mean dose for the organ; D1%: the maximal dose at 1% volume for the organ; MU: monitor unit; 3DCRT: 3-D conformal radiation therapy; IMRT: intensity-modulated radiation therapy; RA: RapidArc.