# Obtain pixel location instead of RAS using Markups

**URL:** https://discourse.slicer.org/t/obtain-pixel-location-instead-of-ras-using-markups/3806
**Category:** Support
**Created:** [August 16, 2018, 8:47pm UTC](https://discourse.slicer.org/t/obtain-pixel-location-instead-of-ras-using-markups/3806 "2018-08-16T20:47:54Z")
**Posts on this page:** 3
**Page:** 1

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### Author: ![lgroves](https://avatars.discourse-cdn.com/v4/letter/l/4af34b/32.png) [@lgroves](https://discourse.slicer.org/u/lgroves)
#### Post date: [August 16, 2018, 8:47pm UTC](https://discourse.slicer.org/t/obtain-pixel-location-instead-of-ras-using-markups/3806/1 "2018-08-16T20:47:54Z")

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I would like to be able to use the Markups module to obtain a 2D pixel location, instead of the RAS coordinates on a transformed image.  
For example I would like to obtain the coordinates of Image\_Probe not RAS in the following image:

 ![image](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/4/f/4fbdc7fb9ddd48aff106cfba1eb2cba7d2d0cbbd.png).

Any help is appreciated. Thanks.

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### Author: ![Andinet\_Enquobahrie](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/andinet_enquobahrie/32/75_2.png) [@Andinet\_Enquobahrie](https://discourse.slicer.org/u/Andinet_Enquobahrie)
#### Post date: [August 16, 2018, 11:39pm UTC](https://discourse.slicer.org/t/obtain-pixel-location-instead-of-ras-using-markups/3806/2 "2018-08-16T23:39:43Z")

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As shown in

[https://www.slicer.org/wiki/Documentation/Nightly/ScriptRepository#Get\_DataProbe\_text](https://www.slicer.org/wiki/Documentation/Nightly/ScriptRepository#Get_DataProbe_text)

you can do something like

```python
infoWidget = slicer.modules.DataProbeInstance.infoWidget
infoWidget.layerIJKs['B'].text

```

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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: [August 17, 2018, 6:47am UTC](https://discourse.slicer.org/t/obtain-pixel-location-instead-of-ras-using-markups/3806/3 "2018-08-17T06:47:22Z")

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I’ve added an example to the script repository that shows how to get voxel coordinate from RAS coordinate of a markup fiducial point: [https://www.slicer.org/wiki/Documentation/Nightly/ScriptRepository#Get\_volume\_voxel\_coordinates\_from\_markup\_fiducial\_RAS\_coordinates](https://www.slicer.org/wiki/Documentation/Nightly/ScriptRepository#Get_volume_voxel_coordinates_from_markup_fiducial_RAS_coordinates)