Table 2 Comparison of the BMD measurements based on all CT images with different ROI sizes and radiation doses.

From: Application of virtual monochromatic images in bone mineral density measurements: a phantom study

CTDIvol

BMD measurement (mg/cm3)

Z

P

Max ROI

Default ROI

12 mGy

117.0 (142.7)

116.2 (142.5)

− 9.076

< 0.001

15 mGy

115.9 (144.0)

115.8 (143.7)

− 5.979

< 0.001

24.4 mGy

114.5 (144.9)

114.6 (144.6)

− 8.475

< 0.001

F

14.73

9.49

  

P

< 0.001

< 0.001

  
  1. The data is presented as the median, with interquartile spacing in parentheses.
  2. BMD bone mineral density, ROI region of interest, CTDIvol volume computed tomography does index.
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