# 📊 How to use EP Workbench for Histogram Analysis of openep data?

**URL:** <https://openep.discourse.group/t/how-to-use-ep-workbench-for-histogram-analysis-of-openep-data/127>\
**Category:** EP Workbench\
**Created:** [18 October 2024 13:02 UTC](https://openep.discourse.group/t/how-to-use-ep-workbench-for-histogram-analysis-of-openep-data/127 "2024-10-18T13:02:06Z")\
**Posts on this page:** 1\
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**Author:** ![vk\_vinush](https://avatars.discourse-cdn.com/v4/letter/v/90ced4/32.png) [@vk\_vinush](https://openep.discourse.group/u/vk_vinush)\
**Post date:** [18 October 2024 13:02 UTC](https://openep.discourse.group/t/how-to-use-ep-workbench-for-histogram-analysis-of-openep-data/127/1 "2024-10-18T13:02:06Z")

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# 📊 How to use EP Workbench for Histogram Analysis of openep data?

EP Workbench (a desktop application) brings electroanatomic mapping data (EAM) to your personal desktop!

In this article we will look at the histogram analysis feature of EP Workbench.

 ![Histogram field applied](https://global.discourse-cdn.com/free1/uploads/openepcommunity/original/1X/5e32727262c3baf0ee421f6554ccd50542b322b6.png)

> EP Workbench supports .openep data format (which can be converted from a mapping system e.g. CARTO, Ensite etc. using our converter tool. **Please contact us for more information on this.**

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## 📊 What is histogram analysis?

Histogram Analysis can be applied to voltage, conduction velocity, or any field maps.

Histogram Analysis is an emerging technique which seeks to provide quantitative analysis of voltage maps over and above a low voltage area. Essentially, voltage histogram analysis is an extension of voltage area calculations where multiple areas are calculated each with a separate voltage range of interest.

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## 📊 How to use Histogram Analysis tool on EP Workbench?

**1.** Load openep data from **Systems** window, on the menubar navigate to:` File > Load > OpenEP` and select an openep file with the extension **.openep** or **.mat**

🔎 _Load the openep data from the systems window_

 ![Screenshot 2024-10-18 at 13.32.56](https://global.discourse-cdn.com/free1/uploads/openepcommunity/original/1X/69f6225ee9ade95135764e7624bd831a16170112.png)

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**2.** Once the file has loaded into the 3D Viewer on the left, go to the 3D Viewer window’s menu bar and select: `Field > Histogram`. You should now see a grey mesh, this because the histogram field hasn’t been applied yet.

🔎 _Select “Histogram” in the Field dropdown._

 ![Screenshot 2024-10-18 at 13.40.24](https://global.discourse-cdn.com/free1/uploads/openepcommunity/original/1X/6f312d4596b14d9e7c8c4766ce261fce52c5c657.jpeg)

🔎 _You should see a grey mesh once you selected Histogram field_

 ![Histogram field applied](https://global.discourse-cdn.com/free1/uploads/openepcommunity/original/1X/12c1227c09e571799e4736ebfb2d9918b818f443.jpeg)

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**3.** To apply a Histogram to the mesh, go to the tabs on the bottom right, and select `Histogram`, then choose the **Field** (which surface data you’d like to apply the threshold to) and then select the **Threshold** value. You should see the two colour applied to the mesh.

> Optionally you can change the **Bin Numbers** , which will change the number of the bins in the histogram viewer.

🔎 _Select “Histogram” in the Tabs on the bottom right window_

 ![Histogram Tab](https://global.discourse-cdn.com/free1/uploads/openepcommunity/original/1X/b82db5e1299da6d96c595a20696d2f59af66d93f.jpeg)

🔎 _Choose the field, and the threshold value to see the histogram applied to your 3D mesh_

 ![Screenshot 2024-10-18 at 13.49.19](https://global.discourse-cdn.com/free1/uploads/openepcommunity/original/1X/5e32727262c3baf0ee421f6554ccd50542b322b6.png)

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> Note: You can go further and convert the regions below the threshold into regions. Regions in EP Workbench are useful for **simulations** in EP Workbench OR to **export** and conduct your own analysis outside of EPw.