[Insight-users] How to use itk::SegmentationLevelSetImageFilter

Fri, 6 Dec 2002 11:00:57 -0500

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Hi,

I want to use SegmentationLevelSetImageFilter to do some brain MRI
segmentation, but didn't make clear how to use it. I have the following
questions about it.

1.	What kind of seed image does it need? Does it accept one label
(class) or multiple label image? In
SparseFieldLevelSetImageFilter<TInputImage,
OutputImage>::ConstructActiveLayer(), it seems that only pixels with
m_ValueZero are put into ActiveLayer. Is this ActiveLayer considered
propagation front? Does it mean that seed label must be zero? Can this seed
label be point, contour, or area?

2.	Threshold SegmentationLevelSetImageFilter , a subclass of
SegmentationLevelSetImageFilter,  need upperThreshold and lowerThreshold.
What is the value range for these two thresholds? Are they the thresholds
for original image or some derived feature image( Curvature, Gradient)? 

3.	Does ITK have any filter supporting Multilabel  Fast Marching?

Thanks a lot.

Sincerely,
Yanjun

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<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>Hi,<o:p></o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><o:p>&nbsp;</o:p></span></font></p>

I want to use SegmentationLevelSetImageFilter
to do some brain MRI segmentation, but didn't make clear how to use it. =
I
have the following questions about it.<o:p></o:p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><o:p>&nbsp;</o:p></span></font></p>

<ol style=3D'mso-margin-top-alt:0in' start=3D1 type=3D1>
 <li class=3DMsoNormal style=3D'mso-list:l0 level1 lfo1;tab-stops:list =
.5in'><font
     size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;font-family:Arial'>What
     kind of seed image does it need? Does it accept one label (class) =
or
     multiple label <span class=3DGramE>image</span>? In <span =
class=3DSpellE>SparseFieldLevelSetImageFilter</span>&lt;<span
     class=3DSpellE>TInputImage</span>, <span =
class=3DSpellE>OutputImage</span>&gt;:<span
     class=3DGramE>:<span =
class=3DSpellE>ConstructActiveLayer</span></span>(), it
     seems that only pixels with <span =
class=3DSpellE>m_ValueZero</span> <span
     style=3D'mso-spacerun:yes'>=A0</span>are put into <span =
class=3DSpellE>ActiveLayer</span>.
     Is this <span class=3DSpellE>ActiveLayer</span> considered =
propagation
     front? Does it mean that seed label must be zero? Can this seed =
label be
     point, contour, or area?<o:p></o:p></span></font></li>
</ol>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><o:p>&nbsp;</o:p></span></font></p>

<ol style=3D'mso-margin-top-alt:0in' start=3D2 type=3D1>
 <li class=3DMsoNormal style=3D'mso-list:l0 level1 lfo1;tab-stops:list =
.5in'><font
     size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;font-family:Arial'>Threshold
     <span class=3DSpellE><span =
class=3DGramE>SegmentationLevelSetImageFilter</span></span><span
     class=3DGramE> ,</span> a subclass of <span =
class=3DSpellE>SegmentationLevelSetImageFilter</span>,
     <span style=3D'mso-spacerun:yes'>=A0</span>need <span =
class=3DSpellE>upperThreshold</span>
     and <span class=3DSpellE>lowerThreshold</span>. What is the value =
range for
     these two thresholds? Are they the thresholds for original image =
or some derived
     feature <span class=3DGramE>image(</span> Curvature, Gradient)? =
<o:p></o:p></span></font></li>
</ol>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><o:p>&nbsp;</o:p></span></font></p>

<ol style=3D'mso-margin-top-alt:0in' start=3D3 type=3D1>
 <li class=3DMsoNormal style=3D'mso-list:l0 level1 lfo1;tab-stops:list =
.5in'><font
     size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;font-family:Arial'>Does ITK
     have any filter supporting <span class=3DSpellE><span =
class=3DGramE>Multilabel</span></span><span
     class=3DGramE> <span =
style=3D'mso-spacerun:yes'>=A0</span>Fast</span> =
Marching?<o:p></o:p></span></font></li>
</ol>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><o:p>&nbsp;</o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>Thanks a lot.<o:p></o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><o:p>&nbsp;</o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>Sincerely,<o:p></o:p></span></font></p>

<p class=3DMsoNormal><span class=3DSpellE><font size=3D2 =
face=3DArial><span
style=3D'font-size:10.0pt;font-family:Arial'>Yanjun</span></font></span>=
<font
size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;font-family:Arial'><o:p></o:p></span></font></=
p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><o:p>&nbsp;</o:p></span></font></p>

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