TABLE 1. Scan set up conditions for the scan parameter experiment and the repeatability experiment. The full range of trials for the repeatability experiment (i.e., three replicates of three exposure times at three levels of averaging) could not be completed because the shell broke during the scan parameter experiment. All data, except for the last scan in the scan parameter experiment with the double voxel size, are plotted in Figure 1.
Scan parameter experiment | ||||
exposure time (ms) |
# x-ray radiographs averaged per view |
# replicate scans | time (mins) |
voxel size (µm) |
200 | 2 | 1 | 15 | 1.86 |
200 | 3 | 2 | 20 | 1.86 |
200 | 5 | 1 | 30 | 1.86 |
333 | 3 | 1 | 33 | 1.86 |
333 | 5 | 1 | 50 | 1.86 |
400 | 4 | 1 | 50 | 1.86 |
500 | 2 | 1 | 37 | 1.86 |
500 | 3 | 1 | 50 | 1.86 |
500 | 5 | 1 | 75 | 1.86 |
500 | 5 | 1 | 75 | 3.72 |
Repeatability experiment | ||||
exposure time (ms) |
#x-ray radiographs averaged per view |
# replicate scans | time (mins) |
voxel size (µm) |
333 | 3 | 3 | 33 | 1.70 |
333 | 4 | 3 | 41 | 1.70 |
333 | 5 | 1 | 50 | 1.70 |
400 | 3 | 1 | 40 | 1.70 |
400 | 4 | 1 | 50 | 1.70 |
400 | 5 | 1 | 60 | 1.70 |
500 | 3 | 1 | 50 | 1.70 |
500 | 4 | 3 | 62 | 1.70 |
500 | 5 | 2 | 75 | 1.70 |
TABLE 2. Average and standard deviation values showing how calculated shell volume varied with the different scan parameters in the two experiments.
Scan parameter experiment | |||
Scan time (mins) |
Average volume (mm3) |
St. dev | n |
0-20 | 0.0477 | 0.0025 | 3 |
21-40 | 0.0480 | 0.0014 | 4 |
41-60 | 0.0503 | 0.0012 | 3 |
61-80 | 0.0500 | n/a | 1 |
Repeat scans experiment | |||
Exposure time (mins) |
Average volume (mm3) |
St. dev | n |
333 | 0.0335 | 0.0006 | 7 |
400 | 0.0335 | 0.0005 | 3 |
500 | 0.0340 | 0.0003 | 6 |
# x-ray radiographs av. per view |
Average volume (mm3) |
St. dev | n |
3 | 0.0334 | 0.0006 | 5 |
4 | 0.0337 | 0.0003 | 7 |
5 | 0.0342 | 0.0004 | 4 |
Scan time (mins) |
Average volume (mm3) |
St. dev | n |
21-40 | 0.0333 | 0.0006 | 4 |
41-60 | 0.0338 | 0.0004 | 7 |
61-80 | 0.0340 | 0.0004 | 5 |