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I have two images from the same series but both image has same Instance Number as 6. Is it Possible???? upto my understanding in a series instance number will be unique for an image in that series. So please help me... in any case is it possible from modality workstation ????

Sujeeth Damodharan
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2 Answers2

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If you look at the General Image Module in PS 3.3 section C.7.6.1, you will notice that Instance Number (0020, 0013) is a Type 2 element. That means it can be empty. So, you should not count for it to be unique at the image/instance level.

LEADTOOLS Support
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Yes this is possible and 100% legal DICOM. The only instance level unique value is the SOP Instance UID.

Chris Hafey
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  • thanks for your reply... but How come it is possible ??? The study's images are sorted by instance number. Instance 1 - first image, instance 2-second image.... then how come 6th and 7th image has same instance number has 6. – Sujeeth Damodharan Sep 21 '15 at 05:22
  • There are many possible reasons why this happened - impossible to say without knowing more information about the study. – Chris Hafey Sep 21 '15 at 12:02