# Spectral HU Curve Volume in CT image for grey level mapping

**URL:** <https://discourse.slicer.org/t/spectral-hu-curve-volume-in-ct-image-for-grey-level-mapping/22875>\
**Category:** Support\
**Tags:** dicom\
**Created:** [April 8, 2022, 5:05pm UTC](https://discourse.slicer.org/t/spectral-hu-curve-volume-in-ct-image-for-grey-level-mapping/22875 "2022-04-08T17:05:12Z")\
**Posts on this page:** 14\
**Page:** 1

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**Author:** ![Kailash\_Singh](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/kailash_singh/32/14940_2.png) [@Kailash\_Singh](https://discourse.slicer.org/u/Kailash_Singh)\
**Post date:** [April 8, 2022, 5:05pm UTC](https://discourse.slicer.org/t/spectral-hu-curve-volume-in-ct-image-for-grey-level-mapping/22875/1 "2022-04-08T17:05:12Z")

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Spectral HU Curve Volume in CT image for grey level mapping

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**Author:** ![lassoan](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/lassoan/32/13_2.png) [@lassoan](https://discourse.slicer.org/u/lassoan)\
**Post date:** [April 9, 2022, 12:12pm UTC](https://discourse.slicer.org/t/spectral-hu-curve-volume-in-ct-image-for-grey-level-mapping/22875/2 "2022-04-09T12:12:01Z")

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Let us know if you have any questions related to this topic.

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**Author:** ![Kailash\_Singh](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/kailash_singh/32/14940_2.png) [@Kailash\_Singh](https://discourse.slicer.org/u/Kailash_Singh)\
**Post date:** [April 12, 2022, 10:41am UTC](https://discourse.slicer.org/t/spectral-hu-curve-volume-in-ct-image-for-grey-level-mapping/22875/3 "2022-04-12T10:41:39Z")

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Spectral HU Curve Volume in CT image for grey level mapping

How to get CT value in excel format

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**Author:** ![Kailash\_Singh](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/kailash_singh/32/14940_2.png) [@Kailash\_Singh](https://discourse.slicer.org/u/Kailash_Singh)\
**Post date:** [April 15, 2022, 5:37pm UTC](https://discourse.slicer.org/t/spectral-hu-curve-volume-in-ct-image-for-grey-level-mapping/22875/4 "2022-04-15T17:37:31Z")

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Spectral HU Curve Volume in CT image for grey level mapping

How to get CT value in excel format

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**Author:** ![lassoan](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/lassoan/32/13_2.png) [@lassoan](https://discourse.slicer.org/u/lassoan)\
**Post date:** [April 15, 2022, 7:27pm UTC](https://discourse.slicer.org/t/spectral-hu-curve-volume-in-ct-image-for-grey-level-mapping/22875/5 "2022-04-15T19:27:00Z")

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Could you send links to papers or websites that describes what you want to compute?

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**Author:** ![Kailash\_Singh](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/kailash_singh/32/14940_2.png) [@Kailash\_Singh](https://discourse.slicer.org/u/Kailash_Singh)\
**Post date:** [April 16, 2022, 3:56pm UTC](https://discourse.slicer.org/t/spectral-hu-curve-volume-in-ct-image-for-grey-level-mapping/22875/6 "2022-04-16T15:56:57Z")

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[https://www.sciencedirect.com/topics/engineering/grayscale-level](https://www.sciencedirect.com/topics/engineering/grayscale-level)

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**Author:** ![Kailash\_Singh](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/kailash_singh/32/14940_2.png) [@Kailash\_Singh](https://discourse.slicer.org/u/Kailash_Singh)\
**Post date:** [April 16, 2022, 4:03pm UTC](https://discourse.slicer.org/t/spectral-hu-curve-volume-in-ct-image-for-grey-level-mapping/22875/7 "2022-04-16T16:03:37Z")

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> **[Dual-Energy and Spectral Energy Computed Tomography: Oncological Body...](https://radiologykey.com/dual-energy-and-spectral-energy-computed-tomography-oncological-body-applications-in-clinical-use/)**
>
> Visit the post for more.

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**Author:** ![Kailash\_Singh](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/kailash_singh/32/14940_2.png) [@Kailash\_Singh](https://discourse.slicer.org/u/Kailash_Singh)\
**Post date:** [April 16, 2022, 4:04pm UTC](https://discourse.slicer.org/t/spectral-hu-curve-volume-in-ct-image-for-grey-level-mapping/22875/8 "2022-04-16T16:04:07Z")

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[https://radiologykey.com/dual-energy-and-spectral-energy-computed-tomography-oncological-body-applications-in-clinical-use/](https://radiologykey.com/dual-energy-and-spectral-energy-computed-tomography-oncological-body-applications-in-clinical-use/)

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**Author:** ![lassoan](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/lassoan/32/13_2.png) [@lassoan](https://discourse.slicer.org/u/lassoan)\
**Post date:** [April 16, 2022, 4:08pm UTC](https://discourse.slicer.org/t/spectral-hu-curve-volume-in-ct-image-for-grey-level-mapping/22875/9 "2022-04-16T16:08:06Z")

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> [@Kailash\_Singh](#):
>
> [https://www.sciencedirect.com/topics/engineering/grayscale-level](https://www.sciencedirect.com/topics/engineering/grayscale-level)

It looks like that the content of this page is randomly generated. Very odd.

> [@Kailash\_Singh](#):
>
> [https://radiologykey.com/dual-energy-and-spectral-energy-computed-tomography-oncological-body-applications-in-clinical-use/](https://radiologykey.com/dual-energy-and-spectral-energy-computed-tomography-oncological-body-applications-in-clinical-use/)

This describes multiple energy CT acquisitions. This at least very broadly defines an area of research, so it helps bit, at least tells what kind of spectrum you are talking about.

So, do you have any question for us? Do you have dual-energy (or multiple energy) CT acquisitions and would like to process and visualize them in Slicer?

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**Author:** ![Kailash\_Singh](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/kailash_singh/32/14940_2.png) [@Kailash\_Singh](https://discourse.slicer.org/u/Kailash_Singh)\
**Post date:** [April 16, 2022, 4:19pm UTC](https://discourse.slicer.org/t/spectral-hu-curve-volume-in-ct-image-for-grey-level-mapping/22875/10 "2022-04-16T16:19:46Z")

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![image](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/6/3/63cdb93fd96d6845c355d65701ef5f3bf16b6c2e.jpeg)  
 ![image](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/6/3/63cdb93fd96d6845c355d65701ef5f3bf16b6c2e.jpeg)  
 ![image](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/f/9/f9553472d7054fd55c2cd80f5ac47beb49421116.jpeg)

Dear Lassoan, I want to know can such kinds of plots be made in 3D Slicer

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**Author:** ![lassoan](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/lassoan/32/13_2.png) [@lassoan](https://discourse.slicer.org/u/lassoan)\
**Post date:** [April 17, 2022, 3:46am UTC](https://discourse.slicer.org/t/spectral-hu-curve-volume-in-ct-image-for-grey-level-mapping/22875/11 "2022-04-17T03:46:28Z")

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Yes, you should be able to make such plots. You need to segment these structures in the images (at each energy). I’m not sure how the mg/cm3 values are computed, but you can read up on it and see how trivial the computation is. Getting the statistics and plotting the results should be no problem - you can use Slicer’s Plots module or matplotlib (or any other Python plotting package).

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**Author:** ![Kailash\_Singh](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/kailash_singh/32/14940_2.png) [@Kailash\_Singh](https://discourse.slicer.org/u/Kailash_Singh)\
**Post date:** [April 17, 2022, 8:48am UTC](https://discourse.slicer.org/t/spectral-hu-curve-volume-in-ct-image-for-grey-level-mapping/22875/12 "2022-04-17T08:48:11Z")

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Thanks Dear Lassoan I would be very happy if you could send me a tutorial link to the Slicer’s Plots module or matplotlib because I’m not getting any online documents or tutorials. When I’m searching on **_[https://www.slicer.org/w/index.php/Documentation/4.11/Developers/Plots](https://www.slicer.org/w/index.php/Documentation/4.11/Developers/Plots),_** _ **Home \< Documentation \< 4.11 \< Developers \< Plots. I’m getting this message** _ _ **"There is currently no text in this page. You can search for this page title in other pages, or search the related logs, but you do not have permission to create this page."** _

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**Author:** ![lassoan](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/lassoan/32/13_2.png) [@lassoan](https://discourse.slicer.org/u/lassoan)\
**Post date:** [April 17, 2022, 10:21pm UTC](https://discourse.slicer.org/t/spectral-hu-curve-volume-in-ct-image-for-grey-level-mapping/22875/13 "2022-04-17T22:21:21Z")

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> [@Kailash\_Singh](#):
>
> Slicer’s Plots module or matplotlib because I’m not getting any online documents or tutorials

Plots module documentation [here](https://slicer.readthedocs.io/en/latest/user_guide/modules/plots.html).

You can find documentation and many examples of the matlplotlib plotting package (one of the most widely used Python packages) by web search.

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**Author:** ![Kailash\_Singh](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/kailash_singh/32/14940_2.png) [@Kailash\_Singh](https://discourse.slicer.org/u/Kailash_Singh)\
**Post date:** [April 19, 2022, 9:04am UTC](https://discourse.slicer.org/t/spectral-hu-curve-volume-in-ct-image-for-grey-level-mapping/22875/14 "2022-04-19T09:04:07Z")

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Dear Lassoan, now I’m exploring this Plot Module, if I have any questions related to this get back to you and thank you so much to guide me 😃 😃.