Table I. X-ray μCT scanner settings and image data properties.
Plant Species | Wheat | Wheat | Wheat | Maize* | Tomato | Tomato |
Soil textural type | Sand | Sand | Sand | Loamy sand | Clay loam | Loamy sand |
Voltage | 130 kV | 130 kV | 130 kV | 80 kV | 110 kV | 110 kV |
Current | 90 μA | 90 μA | 110 μA | 160 μA | 180 μA | 180 μA |
Filter | 1 mm aluminum | 1 mm aluminum | 1 mm aluminum | None | 0.1 mm copper | 0.1 mm copper |
No. of projections | 1,440 | 1,440 | 1,440 | 1,200 | 1,200 | 1,200 |
Resolution (per voxel) | 28.75 μm | 28.75 μm | 28.75 μm | 44.23 μm | 23.91 μm | 23.91 μm |
Detector exposure time | 1,000 ms | 1,000 ms | 1,000 ms | 250 ms | 1,000 ms | 1,000 ms |
Binning mode | 1 × 1 | 1 × 1 | 1 × 1 | 2 × 2 | 1 × 1 | 1 × 1 |
Signal averaging | 4 (1 skip) | 4 (1 skip) | 4 (1 skip) | 6 (3 skip) | 1 (0 skip) | 1 (0 skip) |
Images in stack after reconstruction | 1,800 | 1,800 | 2,000 | 771 | 1,313 | 1,698 |
Image dimension after reconstruction (pixels) | 864 × 864 | 864 × 864 | 876 × 872 | 678 × 668 | 1,388 × 1,404 | 1,404 × 1,380 |