# Fiducial Marker

**URL:** https://discourse.slicer.org/t/fiducial-marker/25046
**Category:** Support
**Created:** [September 1, 2022, 8:34pm UTC](https://discourse.slicer.org/t/fiducial-marker/25046 "2022-09-01T20:34:12Z")
**Posts on this page:** 5
**Page:** 1

<div class="post-metadata">

### Author: ![Mohammad](https://avatars.discourse-cdn.com/v4/letter/m/e274bd/32.png) [@Mohammad](https://discourse.slicer.org/u/Mohammad)
#### Post date: [September 1, 2022, 8:34pm UTC](https://discourse.slicer.org/t/fiducial-marker/25046/1 "2022-09-01T20:34:12Z")

</div>

Operating system: 10  
Slicer version: 4.6

Dear All,

I would be grateful if anyone could help me with how I can add some spherical fiducial  
(Green and Red spheres) (as in the below image) to my CT volume.  
 ![image](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/6/9/69c4be878ad469f6cf8615bec2fd12dab5f5f10a.png)

---

<div class="post-metadata">

### Author: ![ebrahim](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/ebrahim/32/13403_2.png) [@ebrahim](https://discourse.slicer.org/u/ebrahim)
#### Post date: [September 1, 2022, 9:28pm UTC](https://discourse.slicer.org/t/fiducial-marker/25046/2 "2022-09-01T21:28:33Z")

</div>

One approach is to make point fiducials display as larger spheres by manipulating glyph size under “Display” in the markups module:

 ![image](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/b/8/b86a063f708e77f531a50aa32270d9cc5cb48ea7.png)

---

<div class="post-metadata">

### Author: ![muratmaga](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/muratmaga/32/3622_2.png) [@muratmaga](https://discourse.slicer.org/u/muratmaga)
#### Post date: [September 2, 2022, 5:35am UTC](https://discourse.slicer.org/t/fiducial-marker/25046/3 "2022-09-02T05:35:34Z")

</div>

> [@Mohammad](#):
>
> Slicer version: 4.6

You are also using a very outdated version of Slicer. You would do yourself a favor if you move to the current stable (5.0.3)

---

<div class="post-metadata">

### Author: ![Mohammad](https://avatars.discourse-cdn.com/v4/letter/m/e274bd/32.png) [@Mohammad](https://discourse.slicer.org/u/Mohammad)
#### Post date: [September 2, 2022, 3:26pm UTC](https://discourse.slicer.org/t/fiducial-marker/25046/4 "2022-09-02T15:26:21Z")

</div>

Hi.  
Because of some modules, I had to use this version. After trial and error, I could find how to insert these fiducials, now I need to know how can I insert some “Planes”. Please see the below images.  
 ![image](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/3/4/3451cd07a7af543ea65cfd3b46f71e0dc51cf7c9.png)

---

<div class="post-metadata">

### 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: [September 2, 2022, 9:05pm UTC](https://discourse.slicer.org/t/fiducial-marker/25046/5 "2022-09-02T21:05:42Z")

</div>

The planes are computed automatically by the module from the points (and maybe also a ruler line or region of interest - ROI - box).