Re: private dicom tag, how to obtain its value

Posted by Frank Rogge on Apr 07, 2009; 5:23pm
URL: http://imagej.273.s1.nabble.com/private-dicom-tag-how-to-obtain-its-value-tp3693054p3693056.html

Thanks for the solution. It works perfect. I was able to simply build my
linearisation plugin based on this pixeltophotonratio.

Frank

Wayne Rasband schreef:

>> Hello,
>>
>> For the digital mammo system from Sectra, a floating point number
>> PixelToPhotonRatio stored in a private DICOM tag 0019:1024 (type FD)
>> is required for linearisation of the image.
>> Does anybody has experience how to obtain this number in an easy way?
>> ImageJ doesn't know the tag definition (it's private) and interpretes
>> the value as a string: << ºEt{?®Ö? >> instead of a number:
>> 0.354404802857143.
>
> You need to upgrade to the ImageJ 1.42m daily build, which fixes a bug
> that caused FD tags to not be decoded correctly. You also need to
> download the DICOM dictionary at
>
>     http://rsb.info.nih.gov/ij/download/docs/DICOM_Dictionary.txt
>
> to the ImageJ folder, add this line
>
> 00191024=FDPixel to Photon Ratio
>
> and restart ImageJ.
>
> -wayne
>
>