[Insight-users] Medial curve extraction (itk::MedialCurveImageFilter)

[Sergio Vera]

Hi
Yes, vtk file, but what the image contains? it is a binary mask of the bone?
If this is true, medialAxis will  fail.

regards

On Tue, May 24, 2011 at 5:49 PM, Pedro Névoa <pedronevoa at gmail.com> wrote:

> Thank you for the answers.
>
> I am using a .vtk image as input to the filter.
>
>
> 2011/5/24 Sergio Vera <sergio.vera at alma3d.com>
>
>> Pedro,
>> what image are you passing as input to the filter?
>>
>> MedialCurveImageFilter requires a distance map in order to work properly.
>> Even more, you need to supply a smoothed distance map in. Although not
>> explicitly specified in the insight journal article, in the code example you
>> can see how it is done. My experience is that unsmoothed distance map does
>> not work, and that a gaussian blurred dist map is required.
>>
>> Hope it helps
>>
>> On Tue, May 24, 2011 at 12:16 AM, Daniel Blezek <Blezek.Daniel at mayo.edu>wrote:
>>
>>>  Pedro,
>>>
>>>   We’ve found the MedialCurve method to be very sensitive, and difficult
>>> to use correctly.  In contrast, the BinaryThinningImageFilter3D (also from
>>> an Insight Journal article), does a very nice job.
>>>
>>> -dan
>>>
>>>
>>>
>>> On 5/23/11 3:26 PM, "Pedro Névoa" <pedronevoa at gmail.com> wrote:
>>>
>>> Hello,
>>>
>>> I'm trying to reduce a femur to a simple line, in order to achieve an
>>> image of the femur's medial axis. I tried to use the MedialCurve method to
>>> accomplish this but no results were obtained.
>>>
>>> The pixel type of the input image is signed short. I realize that the
>>> input pixel type accepted by Medial Curve is float so I changed the pixel
>>> type of my image to float using ImageReadCastWrite but it kept on not giving
>>> any results - the algorithm is processed endlessly.
>>>
>>> Does anyone know what may be the problem?
>>>
>>> Grateful for your attention,
>>>
>>>
>>> --
>>> *Daniel Blezek, PhD
>>> *Medical Imaging Informatics Innovation Center
>>>
>>> P 127 or (77) 8 8886
>>> T 507 538 8886
>>> E blezek.daniel at mayo.edu
>>>
>>> Mayo Clinic
>>> 200 First St. S.W.
>>> Harwick SL-44
>>> Rochester, MN 55905
>>> mayoclinic.org
>>> "It is more complicated than you think." -- RFC 1925
>>>
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>>
>>
>> --
>> Sergio Vera
>>
>>  Alma IT Systems
>>  C/ Vilana, 4B, 4º 1ª
>>  08022 Barcelona
>>  T. (+34) 932 380 592
>>  www.alma3d.com
>>
>
>
>
> --
> Pedro Névoa
>
>


-- 
Sergio Vera

 Alma IT Systems
 C/ Vilana, 4B, 4º 1ª
 08022 Barcelona
 T. (+34) 932 380 592
 www.alma3d.com
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