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Update documentation release_6.3htm #1539

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Update documentation release_6.3htm #1539

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e7ef0ef
Update release_6.3.htm
rmapree Nov 20, 2024
f58799a
Merge pull request #1 from rmapree/scatter_estimation_documentation
rmapree Nov 20, 2024
d302c36
add link to PR in release notes [ci skip]
KrisThielemans Nov 20, 2024
ee68461
re-fix link to PR in release notes [ci skip]
KrisThielemans Nov 20, 2024
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6 changes: 5 additions & 1 deletion documentation/release_6.3.htm
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Expand Up @@ -63,7 +63,11 @@ <h3>Changed functionality</h3>
</ul>

<h3>Bug fixes</h3>

<li>Fixed a bug in the scatter estimation code (introduced in release 5.1.0) if input data is 3D and "cylindrical" (there was no bug for "blocksoncylindrical" data).
The scatter estimation runs on data constructed via SSRB. However, the attenuation correction factors were incorrectly obtained with adding of oblique segments (as opposed to averaging).
This resulted in intermediate images that had the wrong attenuation correction which were approximately num_segments times larger. This was compensated by the tail-fitting, but resulted in unexpected scale factors (scale factors were around 1/num_segments times what was expected).
This means that if you used the "min/max scale factor" feature in the scatter estimate, you will have to adjust your threshold values. Expected scatter tail-fitting scale factors should now be restored to ~1-1.5 (depending on the amount of multiple and out-of-FOV scatter).
See <a href="https://github.com/UCL/STIR/issues/1532">Issue 1532</a> for more detail. Fixed by using averaging functionality of SSRB instead of adding segments for attenuation correction factors.</li>
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<h3>Build system</h3>

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