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

[Pedro Névoa]

OK, I'll do that.

Thank you,

2011/5/25 Sergio Vera <sergio.vera at alma3d.com>

> Hi
> The combination that worked for me is to use a Smoothed version of the
> distance map (dist map + gaussian filter) however, check the following
> things: distance map is correctly applied (ie: values are bigger at the
> center of your mask).
>
> Also check for any other wring input image. Input to the
> AverageOutwardFluxFilter should be the smoothed distance map. Input for the
> MedialSurfaceImageFilter should be the smoothed dmap + the output of the
> AverageOutwardFluxFilter...
>
> If this fails, maybe having a look at the code might help.
>
> Regards.
>
>
> On Tue, May 24, 2011 at 7:01 PM, Pedro Névoa <pedronevoa at gmail.com> wrote:
>
>> Yes, the image contains a binary mask of the bone... What should I do
>> then?
>>
>> I used the DanielssonDistanceMapImageFilt
>> er to obtain the distance map and tried to run MedialCurve with the output
>> of this algorithm, but it still fails.
>>
>> Thank you,
>>
>>
>> No dia 24 de Maio de 2011 17:31, Sergio Vera <sergio.vera at alma3d.com>escreveu:
>>
>> 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
>>>
>>
>>
>>
>> --
>> Pedro Névoa
>>
>>
>
>
> --
> Sergio Vera
>
>  Alma IT Systems
>  C/ Vilana, 4B, 4º 1ª
>  08022 Barcelona
>  T. (+34) 932 380 592
>  www.alma3d.com
>



-- 
Pedro Névoa
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