# Slicer, evaluation of cursor origin on slice

**URL:** <https://discourse.slicer.org/t/slicer-evaluation-of-cursor-origin-on-slice/34173>\
**Category:** Support\
**Tags:** dicom\
**Created:** [February 6, 2024, 3:24pm UTC](https://discourse.slicer.org/t/slicer-evaluation-of-cursor-origin-on-slice/34173 "2024-02-06T15:24:01Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![alessandro\_um](https://avatars.discourse-cdn.com/v4/letter/a/ac91a4/32.png) [@alessandro\_um](https://discourse.slicer.org/u/alessandro_um)\
**Post date:** [February 6, 2024, 3:24pm UTC](https://discourse.slicer.org/t/slicer-evaluation-of-cursor-origin-on-slice/34173/1 "2024-02-06T15:24:01Z")

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Hello,  
I am learning the ropes with orienting dicoms, so I am using some well known softwares as a ground of truth, among them I’m using Slicer.  
Through math formulas I obtained the same data found under Volume Information (origin and rotation matrix).  
What I am struggling to catch are the points coordinates shown in Data Probe that show up when moving the cursor [CT.xxxxxx (coord1, coord2, coord3)], this are the coordinates in unscaled dicom coordinates with RAS orientation?  
Given a point P\_dcm in dicom coordinates (not oriented raw data) and having the IJK\_TO\_RAS\_matrix, to obtain the probe position I should do: IJK\_TO\_RAS\_matrix \* P\_dcm?