Table 3 Image contrasts at the central position (POS-0) for the different sphere sizes, SBRs and acquisition times. Of note, the slightly higher contrast for the 22 mm sphere size than found for the 28 mm sphere size is expected to be related to Gibbs artefacts well known in PSF reconstructions, in particular evident in unfiltered reconstructions [32]
SBR = 8:1 | SBR = 4:1 | SBR = 2:1 | ||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Acquisition time | 600 s | 120 s | 120 s filtered | 60 s | 30 s | 15 s | 600 s | 120 s | 120 s filtered | 60 s | 30 s | 15 s | 600 s | 120 s | 120 s filtered | 60 s | 30 s | 15 s |
Sphere size (mm) | ||||||||||||||||||
37 | 85.3 | 85.4 | 83.4 | 85.3 | 85.2 | 85.9 | 84.8 | 85.1 | 83.6 | 85.3 | 85.0 | 83 | 86.7 | 86.2 | 85.2 | 87.2 | 88.3 | 87.9 |
28 | 79.9 | 79.4 | 76.9 | 78.6 | 78.1 | 77.6 | 79.4 | 79.1 | 77.3 | 79.2 | 79.8 | 76.0 | 79.5 | 79.8 | 78.7 | 81.0 | 78.3 | 80.6 |
22 | 81.5 | 81.8 | 78.2 | 82.1 | 83.0 | 82.4 | 80.8 | 80.3 | 77.8 | 80.9 | 80.7 | 78.5 | 81.4 | 80.7 | 79.3 | 78.8 | 76.3 | 77.2 |
17 | 77.8 | 77.8 | 73.3 | 79.3 | 80.1 | 78.2 | 75.8 | 77.7 | 74.3 | 77.3 | 78.6 | 75.9 | 76.8 | 76.3 | 74.4 | 73.8 | 71.5 | 76.1 |
13 | 67.9 | 69.1 | 63.9 | 68.5 | 66.0 | 65.2 | 65.6 | 65.9 | 62.3 | 62.4 | 64.8 | 61.5 | 68.3 | 69.3 | 68.1 | 69.2 | 61.2 | 61.9 |
10 | 61.1 | 60.4 | 54.2 | 59.3 | 62.6 | 53.4 | 59.6 | 59.3 | 54.7 | 55.7 | 56.4 | 55.4 | 67.1 | 68.1 | 65.2 | 70.2 | 70.7 | 72.5 |