Discover MakerZone

MATLAB and Simulink resources for Arduino, LEGO, and Raspberry Pi

Learn more

Discover what MATLAB® can do for your career.

Opportunities for recent engineering grads.

Apply Today

Thread Subject:
vertebrae segmentation in an XRAY

Subject: vertebrae segmentation in an XRAY

From: divya

Date: 16 Dec, 2010 04:55:06

Message: 1 of 8

hello, i am trying to extract the edges of vertebrae in human spinal cord from an XRAY. i tried canny segmentation but its of no help because i specifically want the vertebrae and the problem is it has a lot of noise(ribs in the Xray ,etc). if anybody could give me any directions i will work on it further.i need help urgently for my proj. thanks!

Subject: vertebrae segmentation in an XRAY

From: ImageAnalyst

Date: 16 Dec, 2010 12:11:17

Message: 2 of 8

On Dec 15, 11:55 pm, "divya " <divyaagarwa...@gmail.com> wrote:
> hello, i am trying to extract the edges of vertebrae in human spinal cord from an XRAY. i tried canny segmentation but its of no help because i specifically want the vertebrae and the problem is it has a lot of noise(ribs in the Xray ,etc). if anybody could give me any directions i will work on it further.i need help urgently for my proj. thanks!

-----------------------------------------------------------------------------
I think you mean "spine" or "backbone" rather than spinal cord since
there is no vertebrae in the spinal cord. Is the X-Ray a 2D
projection, or a 3D CT scan? And if it's 2D, exactly how are you
defining edges? It's not a trivial question when you're talking about
the projection of an irregularly shaped object onto 2D.

Subject: vertebrae segmentation in an XRAY

From: divya

Date: 16 Dec, 2010 20:53:05

Message: 3 of 8

ImageAnalyst <imageanalyst@mailinator.com> wrote in message <03edb785-cfb8-498c-8e4e-e3c5a7e323ab@s4g2000yql.googlegroups.com>...
> On Dec 15, 11:55 pm, "divya " <divyaagarwa...@gmail.com> wrote:
> > hello, i am trying to extract the edges of vertebrae in human spinal cord from an XRAY. i tried canny segmentation but its of no help because i specifically want the vertebrae and the problem is it has a lot of noise(ribs in the Xray ,etc). if anybody could give me any directions i will work on it further.i need help urgently for my proj. thanks!
>
> -----------------------------------------------------------------------------
> I think you mean "spine" or "backbone" rather than spinal cord since
> there is no vertebrae in the spinal cord. Is the X-Ray a 2D
> projection, or a 3D CT scan? And if it's 2D, exactly how are you
> defining edges? It's not a trivial question when you're talking about
> the projection of an irregularly shaped object onto 2D.

i am very sorry.yes i meant the spine only. i am talking about an Xray 2D projection(the anterio posterio one ).i tried using anisotropic filtering then canny edge detection but its giving me edges for the ribs(which is noise for me) as well but i specifically want the vertebrae.pls help out!

Subject: vertebrae segmentation in an XRAY

From: divya

Date: 16 Dec, 2010 20:54:05

Message: 4 of 8

ImageAnalyst <imageanalyst@mailinator.com> wrote in message <03edb785-cfb8-498c-8e4e-e3c5a7e323ab@s4g2000yql.googlegroups.com>...
> On Dec 15, 11:55 pm, "divya " <divyaagarwa...@gmail.com> wrote:
> > hello, i am trying to extract the edges of vertebrae in human spinal cord from an XRAY. i tried canny segmentation but its of no help because i specifically want the vertebrae and the problem is it has a lot of noise(ribs in the Xray ,etc). if anybody could give me any directions i will work on it further.i need help urgently for my proj. thanks!
>
> -----------------------------------------------------------------------------
> I think you mean "spine" or "backbone" rather than spinal cord since
> there is no vertebrae in the spinal cord. Is the X-Ray a 2D
> projection, or a 3D CT scan? And if it's 2D, exactly how are you
> defining edges? It's not a trivial question when you're talking about
> the projection of an irregularly shaped object onto 2D.

Subject: vertebrae segmentation in an XRAY

From: Sean de

Date: 16 Dec, 2010 21:18:07

Message: 5 of 8

"divya " <divyaagarwal31@gmail.com> wrote in message
> i am very sorry.yes i meant the spine only. i am talking about an Xray 2D projection(the anterio posterio one ).i tried using anisotropic filtering then canny edge detection but its giving me edges for the ribs(which is noise for me) as well but i specifically want the vertebrae.pls help out!


Post a sample image (before and after your filter) on a free file sharing site.

Subject: vertebrae segmentation in an XRAY

From: ImageAnalyst

Date: 16 Dec, 2010 21:30:24

Message: 6 of 8

Of course it will be a very complicated projection. Are you wanting
the absolute outermost boundary, just like what you'd have if you used
colimated visible light and measured the shadow? That might be very
challenging especially where the bone thins out so there is not much
signal there at all, but the bone might be angled in such a way that
there were multiple interior edges that are much stronger.

Subject: vertebrae segmentation in an XRAY

From: divya

Date: 18 Dec, 2010 03:08:07

Message: 7 of 8

ImageAnalyst <imageanalyst@mailinator.com> wrote in message <2cb2fe65-a001-4972-af28-caf60366b1bd@t35g2000yqj.googlegroups.com>...
> Of course it will be a very complicated projection. Are you wanting
> the absolute outermost boundary, just like what you'd have if you used
> colimated visible light and measured the shadow? That might be very
> challenging especially where the bone thins out so there is not much
> signal there at all, but the bone might be angled in such a way that
> there were multiple interior edges that are much stronger.

ya its very difficult to get the outer most projection but i am trying for that only.
i am not getting the result that i want.i guess REGION segmentation is one option but i am not able to understand how it can help! i have the code.any ideas on that?
one more thing can frequency domain transformations help to separate regions??

Subject: vertebrae segmentation in an XRAY

From: ImageAnalyst

Date: 18 Dec, 2010 05:11:07

Message: 8 of 8

How can we help? You answered my question but you didn't answer
Sean's question. So all I can offer is this:
http://iris.usc.edu/Vision-Notes/bibliography/medical864.html#Medical%20Applications%20--%20Skeleton,%20Bone

Tags for this Thread

What are tags?

A tag is like a keyword or category label associated with each thread. Tags make it easier for you to find threads of interest.

Anyone can tag a thread. Tags are public and visible to everyone.

Contact us