// clitk
#include "clitkImageCommon.h"
#include "clitkSetBackgroundImageFilter.h"
-#include "clitkSegmentationFunctions.h"
+#include "clitkSegmentationUtils.h"
#include "clitkAutoCropFilter.h"
// itk
#include "itkConnectedComponentImageFilter.h"
#include "itkRelabelComponentImageFilter.h"
#include "itkOtsuThresholdImageFilter.h"
+#include "itkBinaryThinningImageFilter3D.h"
+#include "itkImageIteratorWithIndex.h"
+
//--------------------------------------------------------------------
-template <class TInputImageType, class TMaskImageType>
-clitk::ExtractLungFilter<TInputImageType, TMaskImageType>::
+template <class ImageType, class MaskImageType>
+clitk::ExtractLungFilter<ImageType, MaskImageType>::
ExtractLungFilter():
clitk::FilterBase(),
- itk::ImageToImageFilter<TInputImageType, TMaskImageType>()
+ itk::ImageToImageFilter<ImageType, MaskImageType>()
{
+ SetNumberOfSteps(10);
+ m_MaxSeedNumber = 500;
+
// Default global options
this->SetNumberOfRequiredInputs(2);
SetPatientMaskBackgroundValue(0);
SetBackgroundValue(0); // Must be zero
SetForegroundValue(1);
+ SetMinimalComponentSize(100);
// Step 1 default values
SetUpperThreshold(-300);
SetUpperThresholdForTrachea(-900);
SetMultiplierForTrachea(5);
SetThresholdStepSizeForTrachea(64);
+ SetNumberOfSlicesToSkipBeforeSearchingSeed(0);
// Step 3 default values
SetNumberOfHistogramBins(500);
p3->SetLastKeep(2);
p3->UseLastKeepOff();
SetLabelizeParameters3(p3);
+
+ // Step 5 : find bronchial bifurcations
+ FindBronchialBifurcationsOn();
}
//--------------------------------------------------------------------
//--------------------------------------------------------------------
-template <class TInputImageType, class TMaskImageType>
+template <class ImageType, class MaskImageType>
void
-clitk::ExtractLungFilter<TInputImageType, TMaskImageType>::
-SetInput(const TInputImageType * image)
+clitk::ExtractLungFilter<ImageType, MaskImageType>::
+SetInput(const ImageType * image)
{
- this->SetNthInput(0, const_cast<TInputImageType *>(image));
+ this->SetNthInput(0, const_cast<ImageType *>(image));
}
//--------------------------------------------------------------------
//--------------------------------------------------------------------
-template <class TInputImageType, class TMaskImageType>
+template <class ImageType, class MaskImageType>
void
-clitk::ExtractLungFilter<TInputImageType, TMaskImageType>::
-SetInputPatientMask(TMaskImageType * image, MaskImagePixelType bg )
+clitk::ExtractLungFilter<ImageType, MaskImageType>::
+SetInputPatientMask(MaskImageType * image, MaskImagePixelType bg )
{
- this->SetNthInput(1, const_cast<TMaskImageType *>(image));
+ this->SetNthInput(1, const_cast<MaskImageType *>(image));
SetPatientMaskBackgroundValue(bg);
}
//--------------------------------------------------------------------
//--------------------------------------------------------------------
-template <class TInputImageType, class TMaskImageType>
+template <class ImageType, class MaskImageType>
void
-clitk::ExtractLungFilter<TInputImageType, TMaskImageType>::
+clitk::ExtractLungFilter<ImageType, MaskImageType>::
AddSeed(InternalIndexType s)
{
m_Seeds.push_back(s);
//--------------------------------------------------------------------
-template <class TInputImageType, class TMaskImageType>
+template <class ImageType, class MaskImageType>
template<class ArgsInfoType>
void
-clitk::ExtractLungFilter<TInputImageType, TMaskImageType>::
+clitk::ExtractLungFilter<ImageType, MaskImageType>::
SetArgsInfo(ArgsInfoType mArgsInfo)
{
SetVerboseOption_GGO(mArgsInfo);
SetUpperThreshold_GGO(mArgsInfo);
SetLowerThreshold_GGO(mArgsInfo);
+ SetNumberOfSlicesToSkipBeforeSearchingSeed_GGO(mArgsInfo);
SetLabelizeParameters1_GGO(mArgsInfo);
if (!mArgsInfo.remove1_given) {
GetLabelizeParameters1()->AddLabelToRemove(2);
SetThresholdStepSizeForTrachea_GGO(mArgsInfo);
AddSeed_GGO(mArgsInfo);
+ SetMinimalComponentSize_GGO(mArgsInfo);
+
SetNumberOfHistogramBins_GGO(mArgsInfo);
SetLabelizeParameters2_GGO(mArgsInfo);
//--------------------------------------------------------------------
-template <class TInputImageType, class TMaskImageType>
+template <class ImageType, class MaskImageType>
void
-clitk::ExtractLungFilter<TInputImageType, TMaskImageType>::
+clitk::ExtractLungFilter<ImageType, MaskImageType>::
GenerateOutputInformation()
{
- input = dynamic_cast<const TInputImageType*>(itk::ProcessObject::GetInput(0));
Superclass::GenerateOutputInformation();
-// MaskImagePointer output = this->GetOutput(0);
+ //this->GetOutput(0)->SetRequestedRegion(this->GetOutput(0)->GetLargestPossibleRegion());
// Get input pointers
- input = dynamic_cast<const TInputImageType*>(itk::ProcessObject::GetInput(0));
- patient = dynamic_cast<const TMaskImageType*>(itk::ProcessObject::GetInput(1));
+ patient = dynamic_cast<const MaskImageType*>(itk::ProcessObject::GetInput(1));
+ input = dynamic_cast<const ImageType*>(itk::ProcessObject::GetInput(0));
// Check image
- if (!HasSameSizeAndSpacing<TInputImageType, TMaskImageType>(input, patient)) {
+ if (!HaveSameSizeAndSpacing<ImageType, MaskImageType>(input, patient)) {
this->SetLastError("* ERROR * the images (input and patient mask) must have the same size & spacing");
return;
}
//--------------------------------------------------------------------
//--------------------------------------------------------------------
- StartNewStep("Set background to initial image");
- working_input = SetBackground<TInputImageType, TMaskImageType>
+ StartNewStepOrStop("Set background to initial image");
+ working_input = SetBackground<ImageType, MaskImageType>
(input, patient, GetPatientMaskBackgroundValue(), -1000);
- StopCurrentStep<InputImageType>(working_input);
+ StopCurrentStep<ImageType>(working_input);
//--------------------------------------------------------------------
//--------------------------------------------------------------------
- StartNewStep("Remove Air");
+ StartNewStepOrStop("Remove Air");
+ // Check threshold
+ if (m_UseLowerThreshold) {
+ if (m_LowerThreshold > m_UpperThreshold) {
+ this->SetLastError("ERROR: lower threshold cannot be greater than upper threshold.");
+ return;
+ }
+ }
// Threshold to get air
- typedef itk::BinaryThresholdImageFilter<InputImageType, InternalImageType> InputBinarizeFilterType;
+ typedef itk::BinaryThresholdImageFilter<ImageType, InternalImageType> InputBinarizeFilterType;
typename InputBinarizeFilterType::Pointer binarizeFilter=InputBinarizeFilterType::New();
binarizeFilter->SetInput(working_input);
if (m_UseLowerThreshold) binarizeFilter->SetLowerThreshold(m_LowerThreshold);
// Labelize and keep right labels
working_image = Labelize<InternalImageType>(working_image, GetBackgroundValue(), true, GetMinimalComponentSize());
+
working_image = RemoveLabels<InternalImageType>
(working_image, GetBackgroundValue(), GetLabelizeParameters1()->GetLabelsToRemove());
+
typename InternalImageType::Pointer air = KeepLabels<InternalImageType>
(working_image,
GetBackgroundValue(),
GetLabelizeParameters1()->GetUseLastKeep());
// Set Air to BG
- working_input = SetBackground<TInputImageType, InternalImageType>
+ working_input = SetBackground<ImageType, InternalImageType>
(working_input, air, this->GetForegroundValue(), this->GetBackgroundValue());
// End
- StopCurrentStep<InputImageType>(working_input);
+ StopCurrentStep<ImageType>(working_input);
//--------------------------------------------------------------------
//--------------------------------------------------------------------
- StartNewStep("Find the trachea");
- if (m_Seeds.size() == 0) { // try to find seed
- // Search seed (parameters = UpperThresholdForTrachea)
- static const unsigned int Dim = InputImageType::ImageDimension;
- typename InternalImageType::RegionType sliceRegion = working_input->GetLargestPossibleRegion();
- typename InternalImageType::SizeType sliceRegionSize = sliceRegion.GetSize();
- typename InternalImageType::IndexType sliceRegionIndex = sliceRegion.GetIndex();
- sliceRegionIndex[Dim-1]=sliceRegionSize[Dim-1]-5;
- sliceRegionSize[Dim-1]=5;
- sliceRegion.SetSize(sliceRegionSize);
- sliceRegion.SetIndex(sliceRegionIndex);
-
- typedef itk::ImageRegionConstIterator<InputImageType> IteratorType;
- IteratorType it(working_input, sliceRegion);
- it.GoToBegin();
- while (!it.IsAtEnd()) {
- if(it.Get() < GetUpperThresholdForTrachea() ) {
- AddSeed(it.GetIndex());
- }
- ++it;
- }
- }
-
- if (m_Seeds.size() != 0) {
- // Explosion controlled region growing
- typedef clitk::ExplosionControlledThresholdConnectedImageFilter<InputImageType, InternalImageType> ImageFilterType;
- typename ImageFilterType::Pointer f= ImageFilterType::New();
- f->SetInput(working_input);
- f->SetVerbose(false);
- f->SetLower(-2000);
- f->SetUpper(GetUpperThresholdForTrachea());
- f->SetMinimumLowerThreshold(-2000);
- f->SetMaximumUpperThreshold(0);
- f->SetAdaptLowerBorder(false);
- f->SetAdaptUpperBorder(true);
- f->SetMinimumSize(5000);
- f->SetReplaceValue(1);
- f->SetMultiplier(GetMultiplierForTrachea());
- f->SetThresholdStepSize(GetThresholdStepSizeForTrachea());
- f->SetMinimumThresholdStepSize(1);
- for(unsigned int i=0; i<m_Seeds.size();i++) {
- // std::cout<<"Adding seed " <<m_Seeds[i]<<"..."<<std::endl;
- f->AddSeed(m_Seeds[i]);
- }
- f->Update();
- trachea_tmp = f->GetOutput();
- // Set output
- StopCurrentStep<InternalImageType>(trachea_tmp);
-
- }
- else { // Trachea not found
- this->SetWarning("* WARNING * No seed found for trachea.");
- // Set output
- StopCurrentStep();
- }
+ StartNewStepOrStop("Search for the trachea");
+ SearchForTrachea();
//--------------------------------------------------------------------
//--------------------------------------------------------------------
- StartNewStep("Extract the lung with Otsu filter");
+ StartNewStepOrStop("Extract the lung with Otsu filter");
// Automated Otsu thresholding and relabeling
- typedef itk::OtsuThresholdImageFilter<InputImageType,InternalImageType> OtsuThresholdImageFilterType;
+ typedef itk::OtsuThresholdImageFilter<ImageType,InternalImageType> OtsuThresholdImageFilterType;
typename OtsuThresholdImageFilterType::Pointer otsuFilter=OtsuThresholdImageFilterType::New();
otsuFilter->SetInput(working_input);
otsuFilter->SetNumberOfHistogramBins(GetNumberOfHistogramBins());
//--------------------------------------------------------------------
//--------------------------------------------------------------------
- StartNewStep("Select labels");
+ StartNewStepOrStop("Select labels");
// Keep right labels
working_image = LabelizeAndSelectLabels<InternalImageType>
(working_image,
//--------------------------------------------------------------------
//--------------------------------------------------------------------
if (m_Seeds.size() != 0) { // if ==0 ->no trachea found
- StartNewStep("Remove the trachea");
+ StartNewStepOrStop("Remove the trachea");
// Set the trachea
working_image = SetBackground<InternalImageType, InternalImageType>
(working_image, trachea_tmp, 1, -1);
- // Dilate the trachea
- static const unsigned int Dim = InputImageType::ImageDimension;
+ // Dilate the trachea
+ static const unsigned int Dim = ImageType::ImageDimension;
typedef itk::BinaryBallStructuringElement<InternalPixelType, Dim> KernelType;
KernelType structuringElement;
structuringElement.SetRadius(GetRadiusForTrachea());
// Set output
StopCurrentStep<InternalImageType>(working_image);
}
-
//--------------------------------------------------------------------
//--------------------------------------------------------------------
typedef clitk::AutoCropFilter<InternalImageType> CropFilterType;
typename CropFilterType::Pointer cropFilter = CropFilterType::New();
if (m_Seeds.size() != 0) { // if ==0 ->no trachea found
- StartNewStep("Croping trachea");
+ StartNewStepOrStop("Croping trachea");
cropFilter->SetInput(trachea_tmp);
cropFilter->Update(); // Needed
typedef itk::CastImageFilter<InternalImageType, MaskImageType> CastImageFilterType;
//--------------------------------------------------------------------
//--------------------------------------------------------------------
- StartNewStep("Croping lung");
- cropFilter = CropFilterType::New(); // Needed to reset pipeline
- cropFilter->SetInput(working_image);
- cropFilter->Update();
- working_image = cropFilter->GetOutput();
+ StartNewStepOrStop("Croping lung");
+ typename CropFilterType::Pointer cropFilter2 = CropFilterType::New(); // Needed to reset pipeline
+ cropFilter2->SetInput(working_image);
+ cropFilter2->Update();
+ working_image = cropFilter2->GetOutput();
StopCurrentStep<InternalImageType>(working_image);
//--------------------------------------------------------------------
//--------------------------------------------------------------------
- StartNewStep("Separate Left/Right lungs");
+ StartNewStepOrStop("Separate Left/Right lungs");
// Initial label
working_image = Labelize<InternalImageType>(working_image,
GetBackgroundValue(),
working_image = statisticsImageFilter->GetOutput();
// Decompose the first label
- static const unsigned int Dim = InputImageType::ImageDimension;
+ static const unsigned int Dim = ImageType::ImageDimension;
if (initialNumberOfLabels<2) {
// Structuring element radius
- typename InputImageType::SizeType radius;
+ typename ImageType::SizeType radius;
for (unsigned int i=0;i<Dim;i++) radius[i]=1;
typedef clitk::DecomposeAndReconstructImageFilter<InternalImageType,InternalImageType> DecomposeAndReconstructFilterType;
typename DecomposeAndReconstructFilterType::Pointer decomposeAndReconstructFilter=DecomposeAndReconstructFilterType::New();
working_image = decomposeAndReconstructFilter->GetOutput();
}
- // Retain labels (lungs)
+ // Retain labels ('1' is largset lung, so right. '2' is left)
typedef itk::ThresholdImageFilter<InternalImageType> ThresholdImageFilterType;
typename ThresholdImageFilterType::Pointer thresholdFilter = ThresholdImageFilterType::New();
thresholdFilter->SetInput(working_image);
thresholdFilter->Update();
working_image = thresholdFilter->GetOutput();
StopCurrentStep<InternalImageType> (working_image);
+
+ // Final Cast
+ StartNewStepOrStop("Final cast");
+ typedef itk::CastImageFilter<InternalImageType, MaskImageType> CastImageFilterType;
+ typename CastImageFilterType::Pointer caster= CastImageFilterType::New();
+ caster->SetInput(working_image);
+ caster->Update();
+ output = caster->GetOutput();
+
+ // Update output info
+ this->GetOutput(0)->SetRegions(output->GetLargestPossibleRegion());
+
+ // Try to extract bifurcation in the trachea (bronchi)
+ // STILL EXPERIMENTAL
+ if (m_Seeds.size() != 0) { // if ==0 ->no trachea found
+
+ if (GetFindBronchialBifurcations()) {
+ StartNewStepOrStop("Find bronchial bifurcations");
+ // Step 1 : extract skeleton
+ // Define the thinning filter
+ typedef itk::BinaryThinningImageFilter3D<MaskImageType, MaskImageType> ThinningFilterType;
+ typename ThinningFilterType::Pointer thinningFilter = ThinningFilterType::New();
+ thinningFilter->SetInput(trachea);
+ thinningFilter->Update();
+ typename MaskImageType::Pointer skeleton = thinningFilter->GetOutput();
+ writeImage<MaskImageType>(skeleton, "skeleton.mhd");
+
+ // Step 2 : tracking
+ DD("tracking");
+
+ // Step 2.1 : find first point for tracking
+ typedef itk::ImageRegionConstIteratorWithIndex<MaskImageType> IteratorType;
+ IteratorType it(skeleton, skeleton->GetLargestPossibleRegion());
+ it.GoToReverseBegin();
+ while ((!it.IsAtEnd()) && (it.Get() == GetBackgroundValue())) {
+ --it;
+ }
+ if (it.IsAtEnd()) {
+ this->SetLastError("ERROR: first point in the skeleton not found ! Abort");
+ return;
+ }
+ DD(skeleton->GetLargestPossibleRegion().GetIndex());
+ typename MaskImageType::IndexType index = it.GetIndex();
+ DD(index);
+
+ // Step 2.2 : initialize neighborhooditerator
+ typedef itk::NeighborhoodIterator<MaskImageType> NeighborhoodIteratorType;
+ typename NeighborhoodIteratorType::SizeType radius;
+ radius.Fill(1);
+ NeighborhoodIteratorType nit(radius, skeleton, skeleton->GetLargestPossibleRegion());
+ DD(nit.GetSize());
+ DD(nit.Size());
+
+ // Find first label number (must be different from BG and FG)
+ typename MaskImageType::PixelType label = GetForegroundValue()+1;
+ while ((label == GetBackgroundValue()) || (label == GetForegroundValue())) { label++; }
+ DD(label);
+
+ // Track from the first point
+ std::vector<BifurcationType> listOfBifurcations;
+ TrackFromThisIndex(listOfBifurcations, skeleton, index, label);
+ DD("end track");
+ DD(listOfBifurcations.size());
+ writeImage<MaskImageType>(skeleton, "skeleton2.mhd");
+
+ for(unsigned int i=0; i<listOfBifurcations.size(); i++) {
+ typename MaskImageType::PointType p;
+ skeleton->TransformIndexToPhysicalPoint(listOfBifurcations[i].index, p);
+ DD(p);
+ }
+
+ }
+ }
}
//--------------------------------------------------------------------
//--------------------------------------------------------------------
-template <class TInputImageType, class TMaskImageType>
+template <class ImageType, class MaskImageType>
void
-clitk::ExtractLungFilter<TInputImageType, TMaskImageType>::
-GenerateData() {
- // Final Cast
- typedef itk::CastImageFilter<InternalImageType, MaskImageType> CastImageFilterType;
- typename CastImageFilterType::Pointer caster= CastImageFilterType::New();
- caster->SetInput(working_image);
- caster->Update();
- // Set output
- //this->SetNthOutput(0, caster->GetOutput()); // -> no because redo filter otherwise
- this->GraftOutput(caster->GetOutput());
- return;
+clitk::ExtractLungFilter<ImageType, MaskImageType>::
+GenerateData()
+{
+ // Do not put some "startnewstep" here, because the object if
+ // modified and the filter's pipeline it do two times. But it is
+ // required to quit if MustStop was set before.
+ if (GetMustStop()) return;
+
+ // If everything goes well, set the output
+ this->GraftOutput(output); // not SetNthOutput
+}
+//--------------------------------------------------------------------
+
+
+//--------------------------------------------------------------------
+template <class ImageType, class MaskImageType>
+void
+clitk::ExtractLungFilter<ImageType, MaskImageType>::
+TrackFromThisIndex(std::vector<BifurcationType> & listOfBifurcations,
+ MaskImagePointer skeleton,
+ MaskImageIndexType index,
+ MaskImagePixelType label)
+{
+ DD("TrackFromThisIndex");
+ DD(index);
+ DD((int)label);
+ // Create NeighborhoodIterator
+ typedef itk::NeighborhoodIterator<MaskImageType> NeighborhoodIteratorType;
+ typename NeighborhoodIteratorType::SizeType radius;
+ radius.Fill(1);
+ NeighborhoodIteratorType nit(radius, skeleton, skeleton->GetLargestPossibleRegion());
+
+ // Track
+ std::vector<typename NeighborhoodIteratorType::IndexType> listOfTrackedPoint;
+ bool stop = false;
+ while (!stop) {
+ nit.SetLocation(index);
+ // DD((int)nit.GetCenterPixel());
+ nit.SetCenterPixel(label);
+ listOfTrackedPoint.clear();
+ for(unsigned int i=0; i<nit.Size(); i++) {
+ if (i != nit.GetCenterNeighborhoodIndex ()) { // Do not observe the current point
+ // DD(nit.GetIndex(i));
+ if (nit.GetPixel(i) == GetForegroundValue()) { // if this is foreground, we continue the tracking
+ // DD(nit.GetIndex(i));
+ listOfTrackedPoint.push_back(nit.GetIndex(i));
+ }
+ }
+ }
+ // DD(listOfTrackedPoint.size());
+ if (listOfTrackedPoint.size() == 1) {
+ index = listOfTrackedPoint[0];
+ }
+ else {
+ if (listOfTrackedPoint.size() == 2) {
+ BifurcationType bif(index, label, label+1, label+2);
+ listOfBifurcations.push_back(bif);
+ TrackFromThisIndex(listOfBifurcations, skeleton, listOfTrackedPoint[0], label+1);
+ TrackFromThisIndex(listOfBifurcations, skeleton, listOfTrackedPoint[1], label+2);
+ }
+ else {
+ if (listOfTrackedPoint.size() > 2) {
+ std::cerr << "too much bifurcation points ... ?" << std::endl;
+ exit(0);
+ }
+ // Else this it the end of the tracking
+ }
+ stop = true;
+ }
+ }
+}
+//--------------------------------------------------------------------
+
+
+//--------------------------------------------------------------------
+template <class ImageType, class MaskImageType>
+bool
+clitk::ExtractLungFilter<ImageType, MaskImageType>::
+SearchForTracheaSeed(int skip)
+{
+ if (m_Seeds.size() == 0) { // try to find seed (if not zero, it is given by user)
+ // Restart the search until a seed is found, skipping more and more slices
+ bool stop = false;
+ while (!stop) {
+ // Search seed (parameters = UpperThresholdForTrachea)
+ static const unsigned int Dim = ImageType::ImageDimension;
+ typename InternalImageType::RegionType sliceRegion = working_input->GetLargestPossibleRegion();
+ typename InternalImageType::SizeType sliceRegionSize = sliceRegion.GetSize();
+ typename InternalImageType::IndexType sliceRegionIndex = sliceRegion.GetIndex();
+ sliceRegionIndex[Dim-1]=sliceRegionSize[Dim-1]-skip-5;
+ sliceRegionSize[Dim-1]=5;
+ sliceRegion.SetSize(sliceRegionSize);
+ sliceRegion.SetIndex(sliceRegionIndex);
+ typedef itk::ImageRegionConstIterator<ImageType> IteratorType;
+ IteratorType it(working_input, sliceRegion);
+ it.GoToBegin();
+ while (!it.IsAtEnd()) {
+ if(it.Get() < GetUpperThresholdForTrachea() ) {
+ AddSeed(it.GetIndex());
+ // DD(it.GetIndex());
+ }
+ ++it;
+ }
+
+ // if we do not found : restart
+ stop = (m_Seeds.size() != 0);
+ if (!stop) {
+ if (GetVerboseStep()) {
+ std::cout << "\t No seed found this time. I skip some slices and restart." << std::endl;
+ }
+ if (skip > 0.5 * working_input->GetLargestPossibleRegion().GetSize()[2]) {
+ // we want to skip more than a half of the image, it is probably a bug
+ std::cerr << "Number of slices to skip to find trachea to high = " << skip << std::endl;
+ stop = true;
+ }
+ skip += 5;
+ }
+ }
+ }
+ return (m_Seeds.size() != 0);
+}
+//--------------------------------------------------------------------
+
+
+//--------------------------------------------------------------------
+template <class ImageType, class MaskImageType>
+void
+clitk::ExtractLungFilter<ImageType, MaskImageType>::
+TracheaRegionGrowing()
+{
+ // Explosion controlled region growing
+ typedef clitk::ExplosionControlledThresholdConnectedImageFilter<ImageType, InternalImageType> ImageFilterType;
+ typename ImageFilterType::Pointer f= ImageFilterType::New();
+ f->SetInput(working_input);
+ f->SetVerbose(false);
+ f->SetLower(-2000);
+ f->SetUpper(GetUpperThresholdForTrachea());
+ f->SetMinimumLowerThreshold(-2000);
+ f->SetMaximumUpperThreshold(0);
+ f->SetAdaptLowerBorder(false);
+ f->SetAdaptUpperBorder(true);
+ f->SetMinimumSize(5000);
+ f->SetReplaceValue(1);
+ f->SetMultiplier(GetMultiplierForTrachea());
+ f->SetThresholdStepSize(GetThresholdStepSizeForTrachea());
+ f->SetMinimumThresholdStepSize(1);
+ for(unsigned int i=0; i<m_Seeds.size();i++) {
+ f->AddSeed(m_Seeds[i]);
+ // DD(m_Seeds[i]);
+ }
+ f->Update();
+
+ // take first (main) connected component
+ writeImage<InternalImageType>(f->GetOutput(), "t1.mhd");
+ trachea_tmp = Labelize<InternalImageType>(f->GetOutput(),
+ GetBackgroundValue(),
+ true,
+ GetMinimalComponentSize());
+ writeImage<InternalImageType>(trachea_tmp, "t2.mhd");
+ trachea_tmp = KeepLabels<InternalImageType>(trachea_tmp,
+ GetBackgroundValue(),
+ GetForegroundValue(),
+ 1, 1, false);
+ writeImage<InternalImageType>(trachea_tmp, "t3.mhd");
}
//--------------------------------------------------------------------
+
+//--------------------------------------------------------------------
+template <class ImageType, class MaskImageType>
+double
+clitk::ExtractLungFilter<ImageType, MaskImageType>::
+ComputeTracheaVolume()
+{
+ typedef itk::ImageRegionConstIterator<InternalImageType> IteratorType;
+ IteratorType iter(trachea_tmp, trachea_tmp->GetLargestPossibleRegion());
+ iter.GoToBegin();
+ double volume = 0.0;
+ while (!iter.IsAtEnd()) {
+ if (iter.Get() == this->GetForegroundValue()) volume++;
+ ++iter;
+ }
+
+ double voxelsize = trachea_tmp->GetSpacing()[0]*trachea_tmp->GetSpacing()[1]*trachea_tmp->GetSpacing()[2];
+ return volume*voxelsize;
+}
+//--------------------------------------------------------------------
+
+
+//--------------------------------------------------------------------
+template <class ImageType, class MaskImageType>
+void
+clitk::ExtractLungFilter<ImageType, MaskImageType>::
+SearchForTrachea()
+{
+ // Search for seed among n slices, skip some slices before starting
+ // if not found -> skip more and restart
+ // when seed found : perform region growing
+ // compute trachea volume
+ // if volume not plausible -> skip more slices and restart
+
+ bool stop = false;
+ double volume = 0.0;
+ int skip = GetNumberOfSlicesToSkipBeforeSearchingSeed();
+ while (!stop) {
+ stop = SearchForTracheaSeed(skip);
+ if (stop) {
+ TracheaRegionGrowing();
+ volume = ComputeTracheaVolume(); // assume mm3
+ if ((volume > 10000) && (volume < 55000 )) { // it is ok
+ // Typical volume 22.59 cm 3 (± 7.69 cm 3 ) [ Leader 2004 ]
+ if (GetVerboseStep()) {
+ std::cout << "\t Found trachea with volume " << volume << " cc." << std::endl;
+ }
+ stop = true;
+ }
+ else {
+ if (GetVerboseStep()) {
+ std::cout << "\t The volume of the trachea (" << volume
+ << " cc) seems not correct. I skip some slices (" << skip << ") and restart to find seeds."
+ << std::endl;
+ }
+ skip += 5;
+ stop = false;
+ // empty the list of seed
+ m_Seeds.clear();
+ }
+ }
+ }
+
+ if (volume != 0.0) {
+ // Set output
+ StopCurrentStep<InternalImageType>(trachea_tmp);
+ }
+ else { // Trachea not found
+ this->SetWarning("* WARNING * No seed found for trachea.");
+ StopCurrentStep();
+ }
+}
+//--------------------------------------------------------------------
+
#endif //#define CLITKBOOLEANOPERATORLABELIMAGEFILTER_TXX
git://git.creatis.insa-lyon.fr / clitk.git / blobdiff