[Insight-users] ImageSeriesWriter creates wrong DICOM directory entries

[Thomas Fejes]

Hello ITK-User,

 

I am using the Image Series Writer to write a series of DICOM files. In the
past, this class had some problems with the z-spacing (always 1mm).
Fortunately this problem was almost  solved with the latest ITK version.
Almost  solved because of the following reasons:

 

I tested the class by reading and writing and reading again the same series.
Based on the fact, that neither a registration nor any other manipulation of
the image has been performed, the Meta Data Dictionary Array should be the
same all over the writing and reading process. THIS is not the case.

 

The following entries, of the Meta Data Dictionary Array, differ from each
other only by rewriting:

 

-----------------------------------------------

 

ID tag: 0018|0088

Original ID tag value: 3.75

Rewritten ID tag value: 1

 

ID tag: 0018|1310

Original ID tag value: 0\256\224\0

Rewritten ID tag value: 23600\13618\23606\12850\23604\48

 

ID tag: 0020|0037

Original ID tag value:
1\-2.0397992e-010\2.1439154e-011\2.051035e-010\0.9945219\-0.10452846

Rewritten ID tag value: 1\0\0\0\1\0

 

ID tag: 0028|0101

Original ID tag value: 12

Rewritten ID tag value: 16

 

ID tag: 0028|0102

Original ID tag value: 11

Rewritten ID tag value: 15

 

ID tag: 0028|0103

Original ID tag value: 0

Rewritten ID tag value: 1

 

ID tag: 0028|0106

Original ID tag value: 0

Rewritten ID tag value: 48

 

ID tag: 0028|0107

Original ID tag value: 994

Rewritten ID tag value: 14649\52

 

----------------------------------------------------------------------------
----

 

ID tag: 0018|0088 -> Is the spacing between slices and automatically set to
1mm.  why??  

 

ID tag: 0018|1310 -> Acquisition Matrix. Why does this value change. ?? No
registration has been performed !!

 

ID tag: 0020|0037-> Image orientation (Patient). The Identity matrix is set
automatically. Why ?? if no changes have been performed, why it must be
changed??  Recalculation ?? See:  https://issues.itk.org/jira/browse/ITK-281

 

ID tag: 0028|0101-> Number of Bits stored. The image has not been changed,
why is this value not the same as on the original image??

 

ID tag: 0028|0102-> Number of Bits stored. The image has not been changed,
why is this value not the same as on the original image??

 

ID tag: 0028|0103-> Number of Bits stored. The image has not been changed,
why is this value not the same as on the original image??

 

ID tag: 0028|0106-> Smallest Image Pixel Value. Why does this value
change???!!!

 

ID tag: 0028|0107-> Largest Image Pixel Value. It added a dimension??!!

 

 

The Tags "Number of Bits stored" differs because I used a higher Bit number
type, I guess. Or are the last four Bits redundant??

 

Question: Is it possible to change the Meta Data Dictionary Array only,
without touching the images and not using the Image Series Writer class ??

 

 

Thanks

 

Best Regards

Thomas

 

 

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