# Measurements Module

**URL:** <https://discourse.slicer.org/t/measurements-module/955>\
**Category:** Support\
**Tags:** segmentation\
**Created:** [August 28, 2017, 12:16am UTC](https://discourse.slicer.org/t/measurements-module/955 "2017-08-28T00:16:00Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![CRS](https://avatars.discourse-cdn.com/v4/letter/c/977dab/32.png) [@CRS](https://discourse.slicer.org/u/CRS)\
**Post date:** [August 28, 2017, 12:16am UTC](https://discourse.slicer.org/t/measurements-module/955/1 "2017-08-28T00:16:00Z")

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Hi guys, new to Slicer. Trying to figure the way to do a parameter or diameter measurement of a brain tumor. Is it even possible with Slicer?

Thanks

RS

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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 28, 2017, 12:22am UTC](https://discourse.slicer.org/t/measurements-module/955/2 "2017-08-28T00:22:23Z")

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You can make simple 2D diameter measurements by placing a ruler ([https://www.slicer.org/wiki/Documentation/Nightly/SlicerApplication/MainApplicationGUI#Mouse\_Modes](https://www.slicer.org/wiki/Documentation/Nightly/SlicerApplication/MainApplicationGUI#Mouse_Modes)).

For volumetric measurements, segment the tumor using [Segment editor module](http://slicer.readthedocs.io/en/latest/user_guide/module_segmenteditor.html). You can segment well-visible brain tumors in a few minutes using Grow from seeds effect (you paint inside and outside the tumor in a few slices and Slicer creates a full 3D model automatically). Then, compute volume using Segment statistics volume.

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<div class="post-metadata">

**Author:** ![CRS](https://avatars.discourse-cdn.com/v4/letter/c/977dab/32.png) [@CRS](https://discourse.slicer.org/u/CRS)\
**Post date:** [August 28, 2017, 11:45am UTC](https://discourse.slicer.org/t/measurements-module/955/3 "2017-08-28T11:45:40Z")

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Hi Andras,

Thanks. I think i’m getting it. Managed to get the ruler out but I’m not sure why the interface is always behind the segmentation? Unable to see the measurement  
On the other hand, managed to segment out the healthy segment from the fracture frontal bone ( Bone as Value :2 and fragment bone as background 0) but it still appear once we go for render a new model.

The end result is to render out a remodel bone to cover the defect , I’m thinking of using GROW from Seed since there are some fragment which we can use as reference or is there a module like MIRROR Image?

Cheers

RS

![image](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/f/b/fb573bb8169d194e2a69cb002bcbbe4a379d4eac.png)

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<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:** [August 28, 2017, 3:58pm UTC](https://discourse.slicer.org/t/measurements-module/955/4 "2017-08-28T15:58:24Z")

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A post was split to a new topic: [How to edit STL file](https://discourse.slicer.org/t/how-to-edit-stl-file/960)

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<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:** [August 31, 2017, 5:22am UTC](https://discourse.slicer.org/t/measurements-module/955/5 "2017-08-31T05:22:32Z")

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> [@CRS](#):
>
> I’m not sure why the interface is always behind the segmentation?

Ruler is a straight line in 3D. If any other structure is in front of that line, the line will not be visible. You can go to `Segmentations` module to temporarily hide the 3D representation or make it semi-transparent.

> [@CRS](#):
>
> managed to segment out the healthy segment from the fracture frontal bone ( Bone as Value :2 and fragment bone as background 0) but it still appear once we go for render a new model.

If you want to remove a region from a volume (by filling it with some background value), then use `Mask volume` effect (install `SegmentEditorExtraEffects` extension to get it).

> [@CRS](#):
>
> is there a module like MIRROR Image

You can mirror a node by using `Transforms` module. Simply create a transform where one of the values in the diagonal is set from the original `1.0` to `-1.0`. Then apply and harden this transform on the node. After this you have to register the mirrored node to the original image - you can do that by using landmark-based registration, for example `Fiducial registration wizard` module in `SlicerIGT` extension.