Editing Scanco Administration (section)

===Determine RSQ's Centre Calibration Values===
<pre>
$ define uct_reconstruction_calibration true   ! Note: do not mistype... or the calibration program will not run
</pre>
In the SAME terminal: 
<pre>$ uct_reconstruction dk0:[microct.data.00004026.00004576]c0001344.rsq
Slice-Nr. [0...919] (Neg. to stop): 100
Center [207]: here enter a new number
</pre>
Hit return a few more times to use default values for other options.
<pre>
XtremeCT check these values, that they do not change:
Maximal possible Scan-Distance (mm) = 125.9520 
Cropped adjusted Scan-Distance (mm) = 125.9520 
See that it does not change, e.g. drop to 124 mm or such...
</pre>
Then do that again, $ uct_reconstruction ....rsq 100 (for the first time, for each file/scan). 

Double click on ISQ. slide to slice 101 (!) (100+1, since terminal zero based) compare with image in e.g. slice 100 or 99 (disregard funny half image shift...) 

Should already look nicer. 

Then try out with e.g. center 230 or so, with e.g. slice 101 (thus slice 102 in Ximage). (now, only one run is necessary) 
<pre>
compare against image with center e.g. 200. 
continue at libitum until you find the best center, the crispest image.
</pre>
Usually the centre is determined to within about 3 to 5 points (which is 0.3 to 0.5 pixels), so e.g. test 225 and 230, and maybe 228. 

Write down your favourite. 

If you cannot decide: let Andres know which ISQ slice was reco-ed with which center (in 'Ximage' slice numbers), and I can check - but since remote Ximage is SOOO slow, thanks for only pointing out a few options, I cannot check 20 settings...

Then continue with next diameter scan (the first time for each scan, reco twice again) 

The different diameter centers should be a steady function, so all the new center values should be increasing as diameter decreases.


[[Image:Redirect.jpg|15px]] [[#top|''Return to Contents'']] or [[Main_Page|''Return to Main Page'']]