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Table 1 The densities and CBCT numbers.

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 0.0 0.9 0.9 1.02 1.03 1.06 1.09 1.30 1.50 1.62 1.84 1.86
  1. The densities and CBCT numbers for generating the CBCT calibration curve