[Rtk-users] Reconstruct Nikon XTH320 data

[M Miller]

The sid/sdd values can be seen in the *.xtekct file at line 17:
SrcToObject=68.4973907470703
SrcToDetector=870.86

Changing the .mhd file is a good suggestion. I didn't know the offset value was used by rtk. I had previously just guessed the proj_iso_* values until the output looked better.
I never use the metaIO format myself, but I thought it would be easier to interface it with rtk than the raw count tiff files. I have two additional CT systems that output similar tiff files and I was hoping that if I can get the Nikon data to reconstruct using metaIO I could later address using tiffs as the input without the mhd conversion.


Thanks

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On Fri, 9/20/13, Simon Rit <simon.rit at creatis.insa-lyon.fr> wrote:

 Subject: Re: [Rtk-users] Reconstruct Nikon XTH320 data
 To: "M Miller" <croow at yahoo.com>
 Cc: "Marc Vila Oliva" <marc.vila-oliva at creatis.insa-lyon.fr>, "rtk-users at openrtk.org" <rtk-users at openrtk.org>
 Date: Friday, September 20, 2013, 3:07 AM
 
 Hi,
 I have been looking at your data. You're right, it's
 complete, Marc's
 download probably stopped.
 Clearly you have a geometry problem and it's going to be
 hard for us
 to solve it for you. Where did you get your sid / sdd from ?
 I have
 also noticed something weird, you use positive offsets in
 your
 projection images that you compensate for with negative
 offsets in the
 geometry file. I would advise you to center your projection
 images
 with negative offset ("Offset = -250 -250 0" in the mhd
 file) and to
 remove your projection offsets if the detector is centered.
 Simon
 
 On Thu, Sep 19, 2013 at 9:06 PM, M Miller <croow at yahoo.com>
 wrote:
 >> Do you really have 3142 projections? Have you
 cropped the raw data?
 >
 > The data does have 3142 projections. The
 CT_121029a_quarter.raw that I uploaded is 3142000000 bytes.
 I downloaded it onto another computer and the size was also
 ~3GB. I also viewed the downloaded data with Avizo and it
 wasn't corrupted. Maybe your download was interrupted?
 >
 > I've uploaded another mhd/raw pair that is much smaller
 (500x500x 500 projections) and may be easier to handle. This
 projection set is equivalent to the 3GB set (*quarter.raw)
 with the number of projections resized to 500.
 >
 > Thank you for your time.
 >
 >
 >
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