Table 2.
BMD, mg/cm-3 | Mean | SD | p-value | App. BF | Mean | SD | p-value |
---|---|---|---|---|---|---|---|
vs. original dose | vs. original dose | ||||||
Proj50 | +0.216 | 0.797 | .197 | Proj50 | +0.024 | 0.034 | .002 |
Proj25 | +0.145 | 1.547 | .650 | Proj25 | +0.036 | 0.052 | .003 |
Proj10 | +0.233 | 1.978 | .569 | Proj10 | +0.035 | 0.055 | .004 |
Tube50 | +2.900 | 1.863 | .000 | Tube50 | +0.037 | 0.032 | .000 |
Tube25 | +7.546 | 11.040 | .003 | Tube25 | +0.057 | 0.072 | .001 |
Tube10 | +41.32 | 67.131 | .006 | Tube10 | +0.094 | 0.120 | .001 |
App. TbN, mm-1 | Mean | SD | p-value | App. TbSp, mm | Mean | SD | p-value |
vs. original dose | vs. original dose | ||||||
Proj50 | +0.058 | 0.025 | .000 | Proj50 | -0.675 | 0.555 | .000 |
Proj25 | +0.089 | 0.066 | .000 | Proj25 | -0.849 | 0.690 | .000 |
Proj10 | +0.038 | 0.047 | .001 | Proj10 | -0.648 | 0.678 | .000 |
Tube50 | +0.046 | 0.027 | .000 | Tube50 | -0.685 | 0.650 | .000 |
Tube25 | +0.082 | 0.048 | .000 | Tube25 | -1.000 | 0.865 | .000 |
Tube10 | +0.104 | 0.091 | .000 | Tube10 | -1.200 | 1.119 | .000 |
App. TbTh, mm | Mean | SD | p-value | FD | Mean | SD | p-value |
vs. original dose | vs. original dose | ||||||
Proj50 | -0.304 | 0.402 | .001 | Proj50 | +0.059 | 0.045 | .000 |
Proj25 | -0.372 | 0.520 | .002 | Proj25 | +0.081 | 0.062 | .000 |
Proj10 | -0.232 | 0.527 | .042 | Proj10 | +0.067 | 0.061 | .000 |
Tube50 | -0.234 | 0.377 | .006 | Tube50 | +0.063 | 0.051 | .000 |
Tube25 | -0.379 | 0.642 | .008 | Tube25 | +0.103 | 0.083 | .000 |
Tube10 | -0.370 | 0.797 | .033 | Tube10 | +0.137 | 0.133 | .000 |
Values are shown as compared to the original dose in all subjects (n=24) with respective p-values
Proj50, Proj25 and Proj10 indicate sparse sampling of 50%, 25% and 10% projection data, respectively
Tube50, Tube25 and Tube10 indicate simulation of 50%, 25% and 10% of the original tube current, respectively
Displayed means and standard deviations (SD) are given in absolute values
App. apparent, BF bone fraction, BMD bone mineral density, FD fractal dimension, TbN trabecular number, TbSp trabecular separation, TbTh trabecular thickness