Tomography dose symmetrical tilt scheme » History » Version 2
Anchi Cheng, 01/21/2019 06:47 PM
| 1 | 1 | Anchi Cheng | h1. Tomography dose symmetrical tilt scheme |
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| 3 | 2 | Anchi Cheng | The dose-symmetric tilt series proposed by Wim Hagen et. al. https://doi.org/10.1016/j.jsb.2016.06.007 acquires first low angle tilts symmetrically in the plus and minus direction before collecting images are high tilt. The same tilt sequence was implemented in [[New User Features 33|3.3 release as "alternate" tilt series]]. Based on user feadback, we added "swing" option since it is reported at some sites that ti performs better due to the characteristics of the particular stage. |
| 4 | 1 | Anchi Cheng | |
| 5 | The difference of the tilt series is shown below: |
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| 7 | "alternate": 0, -3, 3, 6, -6, -9, 9, 12,.... |
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| 8 | "swing": 0, -3, 3,-6, 6, -9, 9, -12,.... |
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| 10 | We also recommend users to investigate the effect of the following two options in pyscope/fei.cfg on the particular scope. |
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| 12 | <pre> |
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| 13 | # Stage with autoloader may need a constant preposition to have stable value |
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| 14 | DO_STAGE_ALPHA_BACKLASH = False |
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| 15 | # Alpha backlash delta (positive means preposition to negative direction) in degrees. |
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| 16 | STAGE_ALPHA_BACKLASH_ANGLE_DELTA = 3.0 |
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| 17 | </pre> |