From: Use of kilovoltage X-ray volume imaging in patient dose calculation for head-and-neck and partial brain radiation therapy
Region of interest (ROI)
1
2
3
4
5
6
7
8
9
10
11
12
13
CBCT Numbers (HU)
0
1379
1500
1950
1990
2000
2103
2158
2468
2500
2670
3293
3847
Density
(g/cm3)
0.0
0.9
1.02
1.03
1.06
1.09
1.30
1.50
1.62
1.84
1.86