. 2015 Mar 6;48(1):63–70. doi: 10.4143/crt.2014.265

Table 2.

Comparisons of dosimetric characteristics and delivery efficiencies for different treatment techniques

Parameter	2F-3DCRT	3F-IMRT	TH-IMRT	TH-3DCRT	p-value
Parameter	2F-3DCRT	3F-IMRT	TH-IMRT	TH-3DCRT	2F-3DCRT vs. TH-3DCRT	3F-IMRT vs. TH-3DCRT	TH-IMRT vs. TH-3DCRT
PTV
CI	0.32	0.65	0.64	0.63	0.01^a)	0.83	0.39
	(0.3-0.35)	(0.62-0.67)	(0.60-0.68)	(0.60-0.67)
HI	1.06	1.09	1.05	1.05	0.39	0.01^a)	> 0.99
	(1.05-1.07)	(1.08-1.10)	(1.05-1.06)	(1.048-1.063)
Carotid artery
V₃₅ (%)	33.88	0.30	0.00	0.00	0.01^a)	0.01^a)	> 0.99
	(20.44-41.36)	(0.05-0.30)	(0.00-0.00)	(0.00-0.00)
V₅₀ (%)	18.48	0.00	0.00	0.00	0.01^a)	> 0.99	> 0.99
	(9.01-25.15)	(0.00-0.00)	(0.00-0.00)	(0.00-0.00)
V₆₃ (%)	7.97	0.00	0.00	0.00	0.01^a)	> 0.99	> 0.99
	(3.97-13.17)	(0.00-0.00)	(0.00-0.00)	(0.00-0.00)
D_max (%)	69.82	38.71	29.23	30.31	0.01^a)	0.01^a)	0.09
	(69.23-70.41)	(35.55-43.52)	(26.37-32.28)	(27.53-34.15)
Spinal cord
D_max (%)	2.58	28.05	24.86	26.76	0.01^a)	0.97	0.01^a)
	(2.38-3.55)	(27.03-28.77)	(23.48-27.52)	(24.76-29.42)
Planning time (min)	5.85	45.48	35.30	7.10	0.01^a)	0.01^a)	0.01^a)
Planning time (min)	(5.50-6.25)	(40.65-48.28)	(32.91-40.78)	(6.35-8.40)
Delivery time (min)	2.06	2.48	2.90	2.86	0.01^a)	0.01^a)	> 0.99
Delivery time (min)	(1.99-2.11)	(2.45-2.51)	(2.81-2.97)	(2.73-3.00)
Pretreatment dosimetric QA	×	○	○	×	-	-	-

Values are presented as median (interquartile range). 2F-3DCRT, 2-field 3-dimensional conformal radiotherapy; 3F-IMRT, 3-field intensity-modulated radiation therapy; TH-IMRT, TomoHelical IMRT; TH-3DCRT, TomoHelical 3DCRT; PTV, planning target volume; CI, conformity index; HI, homogeneity index; VD, the percentage of the organ volume that received D Gy or more; D_max, maximum dose; QA, quality assurance.

^a)

Statistically significant.