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Table 1 HU changes of OARs due to the CA injection

From: Dosimetric effect of CT contrast agent in CyberKnife treatment plans

OARs No. of cases Baseline [HU] Max changes [HU] Average changes [HU]
Aorta 5 53 223 171 ± 40
Heart 5 12 164 155 ± 7
Kidney 10 13 158 124 ± 33
Lung 14 -650 121 45 ± 32
Liver 12 40 64 45 ± 14
Stomach 3 -64 55 40 ± 16
Rectum 6 17 37 33 ± 5
Urethra 5 37 42 32 ± 9
Esophagus 14 -126 67 31 ± 14
PTV 22 -16 113 30 ± 28
Bowel 17 -72 40 27 ± 9
Bladder 6 11 14 8 ± 3
Spinal cord/cauda equina 17 41 12 6 ± 3
Femur head 5 234 4 2 ± 1