Dear mailing list members, dear Luca,
Recently I was trying to enhance vascular structures from airways with
the vessel enhancement filters from ITK (objectness and vessel
enhancement). The problem is that these vessels are not filled in the
tomograms our imaging technique yields. Only the airway walls are
imaged, which corresponds to an uneven 2D surface. Since it is only a 3D
not an ND problem, I tried to modify
itkHessianSmoothed3DToVesselnessMeasureImageFilter to enhance not
vessels (1D) structures but plates/walls. Therefore I exchanged lambda 1
and 3 in the weighting function. Sadly, I could not get the filter to
enhance the airway walls.
Have I missed anything or would enhancing plateness this way only work
for not-curved planes?
Here the important part of the diff of my changes:
diff -au
itk/IJ-Vessel_Enhancement_Diffusion.1/itkHessianSmoothed3DToVesselnessMeasureImageFilter.txx
itk/plateness3D_01/itkHessianSmoothed3DToPlatenessMeasureImageFilter.txx
+ ////swap Lambda1 and Lambda3 to enhance "plateness"
+ double swap_tmp= Lambda1;
+ Lambda3= Lambda1;
+ Lambda1= swap_tmp;
+ ///swapping done
+
double Lambda1Abs = vnl_math_abs( Lambda1 );
double Lambda2Abs = vnl_math_abs( Lambda2 );
double Lambda3Abs = vnl_math_abs( Lambda3 );
@@ -162,14 +168,13 @@
double vesMeasure_3 =
( 1 - vcl_exp( -1.0 * (( vnl_math_sqr( S )) / ( 2.0 * (
GammaSqr)))));
- double vesMeasure_4 =
- vcl_exp ( -1.0 * ( 2.0 * vnl_math_sqr( m_C )) /
- ( Lambda2Abs * (Lambda3Sqr)));
+ double vesMeasure_4 = 1; ////plateness for now not smoothed
+ //double vesMeasure_4 = vcl_exp ( -1.0 * ( 2.0 * vnl_math_sqr(
m_C )) / ( Lambda2Abs * (Lambda3Sqr))); ////check if this makes sense
for plateness
Many thanks for any help or hints.
Roman
--
Dr. Roman Grothausmann
Tomographie und Digitale Bildverarbeitung
Tomography and Digital Image Analysis
Institut für Funktionelle und Angewandte Anatomie, OE 4120
Medizinische Hochschule Hannover
Carl-Neuberg-Str. 1
30625 Hannover
Tel. +49 511 532-9574
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