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Subject:

Re: A very simple question

From:

Alle Meije Wink <[log in to unmask]>

Reply-To:

Alle Meije Wink <[log in to unmask]>

Date:

Fri, 1 Dec 2000 09:22:35 +0100

Content-Type:

text/plain

Parts/Attachments:

Parts/Attachments

text/plain (42 lines)

Dear Nathan,

> I'm using SPM99 for PET analyses.  My raw PET scans are VERY
> different from each other in terms of their translations and
> rotations.  I've used the DISPLAY option in SPM to manually
> translate and rotate each image so that their origins fit in the
> AC/PC plane.  I've also used the Check Reg option to verify that
> each image matches each other adequately.  However, when
> realigning the images the translations are huge (20-30 mm)
> because their individual origin locations (ex. [128 128 11] and
> [140 160 8]) differ largely.  I can't seem to get around this
> and I know that one should not proceed further if translations
> exceed ~5mm.
>
> Any suggestions?
I'd suggest that you check the results of your coregistration visually.
If they match, and if they match again after that when you open them
separately in a display window, the proper .mat file was has been
written.
When you manually adjusted the origins of the PET-scans - did you make
sure to rewrite the header/.mat file? And was that .mat file used as
input for the coregistration process?

Good luck,
Alle Meije

--

 Alle Meije Wink

 Institute for Mathematics and Computing Science, room 105
 University of Groningen                 P.O. Box 800
                                         9700 AV Groningen
 Telephone +31 50 363 71 27              The Netherlands
 Fax:      +31 20 875 48 00
 E-mail:   [log in to unmask]
 WWW:      http://www.cs.rug.nl/~wink

 " I guess it comes down to a simple choice, really.
   Get busy living, or get busy dying. "
 (Andy Dufresne in The Shawshank Redemption)

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