Table 2.
Experimental and reconstruction parameters
|
Scan configuration
|
Effective pixel size (µm)
|
Energy (keV)
|
Number of projections1
|
Phase retrieval scheme
|
Phase retrieval parameter
|
Ring removal algorithm
|
| Laboratory setup (liquid metal jet) | 0.9202 | 9.25 (Kα) | 1 × 1000 (50 s) or 1 × 700 (40 s) | BAC | α = 0.008, β = 0.160 | Wavelet |
| Laboratory setup (rotating anode) | 1.072 | 8.05 (Kα) | 1 × 1000 (50 s) or 1 × 700 (40 s) | BAC | α = 0.07, β = 0.16 | Wavelet |
| GINIX waveguide (all samples except for ED/Ehlers-Danlos patient) | 0.169 | 8.00 | 4 × 1500 (1 s) or 3 × 1500 (1 s) | Non-linear Tikhonov3 | δ/β = 50, lim1 = 8e-3, lim2 = 0.5 | Additive |
| GINIX waveguide (ED/Ehlers-Danlos patient) | 0.176 | 7.50 | 4 × 1000 (2 s) | Non-linear Tikhonov3 | δ/β = 50, lim1 = 1e-4, lim2 = 0.1 | Additive |
1
Due to time constraints, some samples were scanned with a lower number of projections and shorter exposure times (in the overview scans) or with less distances (in the high-resolution scans of the drug-induced chronic intestinal pseudo-obstruction patient and of the 40 years old control).
2
After voxel binning of 2 × 2 × 2.
3
No support, no restriction on phase shift.
GINIX: Gottingen Instrument for Nano-Imaging with X-rays; ED: Enteric dysmotility.