# How to segment the invertebrate disc between L4 and L5?
**URL:** https://discourse.slicer.org/t/how-to-segment-the-invertebrate-disc-between-l4-and-l5/1098
**Category:** Support
**Created:** [September 21, 2017, 7:25pm UTC](https://discourse.slicer.org/t/how-to-segment-the-invertebrate-disc-between-l4-and-l5/1098 "2017-09-21T19:25:44Z")
**Posts on this page:** 9
**Page:** 1
### Author:  [@deepmech](https://discourse.slicer.org/u/deepmech)
#### Post date: [September 21, 2017, 7:25pm UTC](https://discourse.slicer.org/t/how-to-segment-the-invertebrate-disc-between-l4-and-l5/1098/1 "2017-09-21T19:25:44Z")
whether it is cartilage or meniscus ?
i tried in cartilage.
when we use volume rendering for bone we use CT-AAA2 format
what i should use for invertebrate disc.
when we select the intensity/threshold for cartilage (or any material) in segmentation
is any properties other than threshold also captured just as viscosity,semi-solid or stiffness?
---
### Author:  [@lassoan](https://discourse.slicer.org/u/lassoan)
#### Post date: [September 22, 2017, 1:49pm UTC](https://discourse.slicer.org/t/how-to-segment-the-invertebrate-disc-between-l4-and-l5/1098/2 "2017-09-22T13:49:05Z")
Using volume rendering, you may or may not be able to visualize a disc - depending on what imaging modality (CT/MRI) and imaging protocol you used.
If adjusting transfer functions in volume rendering does not give you good results or you need to quantify or 3D print the disc then you need to segment the volume using Segment editor (in latest nightly version of Slicer). Cartilage can often be segmented using “Grow from seeds effect” - or of course manually, using Paint or Draw effects.
---
### Author:  [@deepmech](https://discourse.slicer.org/u/deepmech)
#### Post date: [September 24, 2017, 4:11am UTC](https://discourse.slicer.org/t/how-to-segment-the-invertebrate-disc-between-l4-and-l5/1098/3 "2017-09-24T04:11:07Z")
thank you sir
but you didn’t tell whether it capture other properties or not
---
### Author:  [@deepmech](https://discourse.slicer.org/u/deepmech)
#### Post date: [September 24, 2017, 4:20am UTC](https://discourse.slicer.org/t/how-to-segment-the-invertebrate-disc-between-l4-and-l5/1098/4 "2017-09-24T04:20:29Z")
good morning sir
sometime when i used crop volume it does not crop it on axial,sagitial and coronal view,
today it crooped but images are very small.
i am attaching snapshot
sometime when i restart the software it works and sometimes not.
---
### Author:  [@lassoan](https://discourse.slicer.org/u/lassoan)
#### Post date: [September 24, 2017, 4:38am UTC](https://discourse.slicer.org/t/how-to-segment-the-invertebrate-disc-between-l4-and-l5/1098/5 "2017-09-24T04:38:45Z")
> [@deepmech](#):
>
> today it crooped but images are very small
Click [“Reset field of view” buttons](http://slicer.readthedocs.io/en/latest/user_guide/user_interface.html) in the slice viewers to make the image fill the slice viewer (or right-click and drag up/down to zoom in/out).
Crop module will remove whatever is outside the cropping region of interest.
When you go to segmentation module, make sure you select the cropped volume as master volume. If another volume is selected already then delete the segmentation, create a new segmentation, and choose the cropped volume as master volume.
---
### Author:  [@lassoan](https://discourse.slicer.org/u/lassoan)
#### Post date: [September 24, 2017, 4:44am UTC](https://discourse.slicer.org/t/how-to-segment-the-invertebrate-disc-between-l4-and-l5/1098/6 "2017-09-24T04:44:20Z")
> [@deepmech](#):
>
> but you didn’t tell whether it capture other properties or not
CT images capture radiographic density. Most often different structures have somewhat different radiographic density, but in general there is no direct mapping between radiographic density and mechanical properties. Most common approach is to segment structures and set mechanical properties to be uniform (or potentially somewhat modulated by the radiographic density) within.
---
### Author:  [@deepmech](https://discourse.slicer.org/u/deepmech)
#### Post date: [October 10, 2017, 5:36pm UTC](https://discourse.slicer.org/t/how-to-segment-the-invertebrate-disc-between-l4-and-l5/1098/7 "2017-10-10T17:36:22Z")
hello sir ,
when i am using fast grow cut segment, it is showing error.
i noticed during first selection of region it is same as threshold as second region in some part.
i get the intervertebrae disc by segment editor but i tried fast grow cut method.
---
### Author:  [@lassoan](https://discourse.slicer.org/u/lassoan)
#### Post date: [October 11, 2017, 3:35am UTC](https://discourse.slicer.org/t/how-to-segment-the-invertebrate-disc-between-l4-and-l5/1098/8 "2017-10-11T03:35:28Z")
Use the latest nightly version of Slicer and the Segment Editor module (not the legacy Editor module).
---
### Author:  [@lassoan](https://discourse.slicer.org/u/lassoan)
#### Post date: [November 3, 2017, 3:39pm UTC](https://discourse.slicer.org/t/how-to-segment-the-invertebrate-disc-between-l4-and-l5/1098/9 "2017-11-03T15:39:25Z")
A post was split to a new topic: [Crop volume using ellipse, rectangle, or freeform shape](https://discourse.slicer.org/t/crop-volume-using-ellipse-rectangle-or-freeform-shape/1363)