# Unable to show DVH

**URL:** https://discourse.slicer.org/t/unable-to-show-dvh/13708
**Category:** Support
**Created:** [September 26, 2020, 6:07am UTC](https://discourse.slicer.org/t/unable-to-show-dvh/13708 "2020-09-26T06:07:55Z")
**Posts on this page:** 5
**Page:** 1

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### Author: ![calvin.kohwy](https://avatars.discourse-cdn.com/v4/letter/c/4bbf92/32.png) [@calvin.kohwy](https://discourse.slicer.org/u/calvin.kohwy)
#### Post date: [September 26, 2020, 6:07am UTC](https://discourse.slicer.org/t/unable-to-show-dvh/13708/1 "2020-09-26T06:07:55Z")

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Hi all

Upon loading my dose dicom in my slicer, I am able to compute DVH and show the dvh curve of my tumor target.

 ![image](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/0/5/05dcc118c6b21d15a69ee6ee4ca95ded42edb5fc.png)

However, I tried computing the dvh for OAR for eg. Brainstem, it computes and showed the volume and intensity values. However, the graph does not show anything.

 ![oardvh](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/7/b/7be4443449b6a88104c5aa9d598130e2dacc7c77.png)

I had tried exporting the dvh to csv file, but it showed no values.

Can anyone please advice!

Thank you!

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### Author: ![cpinter](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/cpinter/32/7995_2.png) [@cpinter](https://discourse.slicer.org/u/cpinter)
#### Post date: [September 26, 2020, 1:49pm UTC](https://discourse.slicer.org/t/unable-to-show-dvh/13708/2 "2020-09-26T13:49:59Z")

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First of all, please use a recent nightly, because 4.10.2 is two years old.

Second, if you open the individual structure list, then the DVH is calculated for the structure you have selected. It is usually better to calculate all.

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<div class="post-metadata">

### Author: ![calvin.kohwy](https://avatars.discourse-cdn.com/v4/letter/c/4bbf92/32.png) [@calvin.kohwy](https://discourse.slicer.org/u/calvin.kohwy)
#### Post date: [September 26, 2020, 6:39pm UTC](https://discourse.slicer.org/t/unable-to-show-dvh/13708/3 "2020-09-26T18:39:13Z")

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Hi Csaba

I found the issue which is if there is negative values in the dicom, it will stop it from plotting the dvh…

All is good now. Thank you

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<div class="post-metadata">

### Author: ![cpinter](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/cpinter/32/7995_2.png) [@cpinter](https://discourse.slicer.org/u/cpinter)
#### Post date: [September 28, 2020, 11:09am UTC](https://discourse.slicer.org/t/unable-to-show-dvh/13708/4 "2020-09-28T11:09:32Z")

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@calvin.kohwy Thanks for the update! This looks like a bug (I think negative dose values should be treated as 0 during calculation). Does this occur in the latest preview version as well?

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### Author: ![calvin.kohwy](https://avatars.discourse-cdn.com/v4/letter/c/4bbf92/32.png) [@calvin.kohwy](https://discourse.slicer.org/u/calvin.kohwy)
#### Post date: [October 5, 2020, 6:49am UTC](https://discourse.slicer.org/t/unable-to-show-dvh/13708/5 "2020-10-05T06:49:15Z")

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Yes, in the latest version, it happened as well!