Table 1.

Patients and image acquisition parameters.

Patients		Group 1 (n = 39)	Group 2 (n = 15)
Age		58 ~ 78 year (69 ± 4.7 year)	58 ~ 83 year (72 ± 6.5 year)
Weight		54 ~ 115.4 kg (87.1 ± 13.2 kg)	62 ~ 122 kg (90.2 ± 17.3 kg)
Imaging year		2012 ~ 2014	2017 ~ 2018
Imaging parameters or sequence	CT	32 patients: GE LightSpeedRT (140 kVp; 2.5 mm slice thickness) 7 patients: Toshiba Aquilion (120 kVp; 2.0 mm slice thickness)	3 patients: GE LightSpeedRT (140 kVp; 2.5 mm slice thickness) 6 patients: Toshiba Aquilion (120 kVp; 2.0 mm slice thickness) 6 patients: Siemens SOMATOM (120 kVp; 2.0 mm slice thickness)
	MRI	Siemens Skyra 3.0 T 3D T2-weighted SPACE (Sampling perfection with application optimized contrasts using different flip angle evolution) sequence Echo time (TE) = 102 ms; Repetition time (TR) = 1,200 ms; Flip angle = 135°; Field of view (FOV) = 430 mm; Slice thickness = 1.6 mm
Treatment plan		39 IMRT	11 IMRT, 4 VMAT