Table 3.

Value and standard deviation of the absolute dose difference between megavoltage cone‐beam computed tomography (MV CBCT) images with a total of 9 monitor units (MUs) and portal images with a total of 4 MUs in six treatment sites for tumor and 14 critical organs, where GTV is the gross tumor volume and CTV is the clinical tumor volume

	Pelvis	Abdomen	Lung	Head and neck	Left breast	Prostate
Max dose	$4.67\pm 0.17$	$4.81\pm 0.44$	$5.46\pm 0.35$	$5.73\pm 0.43$	$5.56\pm 0.39$	$5.17\pm 0.14$
Isocenter	$3.65\pm 0.22$	$3.70\pm 0.57$	$4.23\pm 0.24$	$5.11\pm 0.08$	$3.94\pm 0.81$	$3.51\pm 0.22$
Integral dose	$2.27\pm 0.93$	$2.22\pm 0.41$	$3.22\pm 0.19$	$3.41\pm 0.35$	$2.82\pm 0.39$	$3.63\pm 0.12$
GTV/CTV	$3.20\pm 0.45$	$3.83\pm 0.67$	$4.38\pm 0.50$	$4.98\pm 0.95$	$5.21\pm 0.49$	$2.71\pm 0.22$
Rectum	$4.67\pm 0.15$					$3.54\pm 1.39$
Bladder	$2.87\pm 0.60$					$3.17\pm 0.91$
Bowel						$3.62\pm 0.34$
Kidney	$4.20\pm 2.58$	$2.51\pm 1.60$
Liver		$2.22\pm 0.51$
Spleen		$2.39\pm 0.86$
Lung		$1.77\pm 1.79$	$4.02\pm 124$		$3.89\pm 0.36$
Esophagus			$4.40\pm 0.37$
Heart			$3.69\pm 1.09$		$4.33\pm 0.650$
Contralateral breast					$2.65\pm 0.49$
Spinal cord		$1.65\pm 0.96$	$3.14\pm 0.61$	$4.01\pm 0.77$	$1.46\pm 0.45$
Brain Stem				$1.57\pm 1.39$
Parotid				$2.60\pm 1.68$
Mandible				$5.52\pm 0.07$