[Dcmlib] GetZSpacing in Varian Dicom RT dose files

[Mathieu Malaterre]

Piotr,

	Thank you so much for your image.
	Your code looks ok but it only works in this particular case, since 
according the DICOM definition:

	ftp://medical.nema.org/medical/dicom/final/cp434_ft.pdf

	You can have absolute Z value, therefore the Z1 value might not be zero 
(well you get the idea...).

Anwyay thanks a lot this is definely an excellent thing we can now find 
the Z spacing in Varian DICOM file.

Regards,
Mathieu

Piotr Kamiński wrote:
> Hello
> 
> i've uploaded such files (RT DOSE & RT PLAN file from Varian Eclipse  
> treatment planning system) here
> http://www.piotrkaminski.com/dicom/
> 
> Hope it helps
> 
> Thanks
> Piotr
> 
> 
> On Mon, 14 Nov 2005 04:13:45 +0100, Mathieu Malaterre  
> <mathieu.malaterre at kitware.com> wrote:
> 
>> Piotr,
>>
>>     Thanks a lot for your report ! This is always great to have such  
>> feedback, but in this case could we get an example of such DICOM file 
>> ?  So that we can add it to our testing suite, and thus make sure that 
>> your  patch always work.
>>
>> Thanks a bunch
>> Mathieu
>>
>> Piotr Kamiński wrote:
>>
>>> Hello
>>>  File::GetZSpacing returns 0 when reading from a Varian Eclipse 
>>> DICOM  RT DOSE file when you export a calculated dose cube from.  But 
>>> there is  another way of guessing the Z-Spacing there - you can get 
>>> it from the  Grid Frame Offset Vector field (0x3004,0x000c), which 
>>> usually looks like
>>> 0.0\2.0\4.0...
>>>  Maybe you will consider adding a fix to the GetZSpacing function
>>>  the following works in the stable version but not in the CVS version
>>>  float dummy, z_spacing;
>>> ValEntry *vr = ff->GetValEntry(0x3004,0x000c);
>>> sscanf(vr->GetValue().c_str(),"%f\\%f",&dummy,&z_spacing);
>>>  Thanks
>>> Piotr Kaminski
>>>        _______________________________________________
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>>> Dcmlib at creatis.insa-lyon.fr
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>>>
>>
>>
>>
> 
> 
> 
> 
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