Table 1.
Parameters applied for X-ray microtomography
| Sample type | Crust samplesa | Filaments incubated in sponge | Filaments fixed on needle | |
|---|---|---|---|---|
| Parameters | ||||
| Objective | 4′ | 20′ | 20′ | 20′ |
| Source voltage (kV) | 50 | 100 | 90 | 70 |
| Source power (W) | 4 | 9 | 8 | 6 |
| Source/detector distance (mm) | 15/15 | 14/12 | 14/12 | 11/8 |
| Number/angle of projections | 1,601/180° | 3,201/360° | 2,001/180° | 2,001/180° |
| Bin number | 2 | 2 | 2 | 2 |
| Exposure time (s) | 1 | 2.5 | 1 | 1 |
| Resolution (μm) | 3.3428 | 0.7284 | 1.4568 | 0.783 |
a
Note that 2 sets of scanning parameters were applied for crust samples to achieve different resolutions.