// The 'computeSliceSpacing' method
double LoadSeriesThread::computeSliceSpacing(OrthancClient::Series& series) const
{
OrthancClient::Instance instance = series.GetInstance(0);
instance.LoadTagContent("0020-0032"); // ImagePositionPatient
QString pos1 = instance.GetLoadedTagContent().c_str();
QStringList pos1s = pos1.split("\\");
Vector3D pos1vector(pos1s.at(0).toDouble(), pos1s.at(1).toDouble(),
pos1s.at(2).toDouble());
instance.LoadTagContent("0020-0037"); // ImageOrientationPatient
QString or1 = instance.GetLoadedTagContent().c_str();
QStringList or1s = or1.split("\\");
Vector3D v(or1s.at(0).toDouble(), or1s.at(1).toDouble(), or1s.at(2).toDouble());
Vector3D w(or1s.at(3).toDouble(), or1s.at(4).toDouble(), or1s.at(5).toDouble());
Vector3D n = v.crossProduct(w);
n.normalize();
double min = -1;
for(unsigned int i = 1 ; i < series.GetInstanceCount() ; i++) // TODO normally one can be enough but some bug forced me to search for the minest
{
OrthancClient::Instance instance2 = series.GetInstance(i);
instance2.LoadTagContent("0020-0032");
QString pos2 = instance2.GetLoadedTagContent().c_str();
QStringList pos2s = pos2.split("\\");
Vector3D pos2vector(pos2s.at(0).toDouble(), pos2s.at(1).toDouble(),
pos2s.at(2).toDouble());
double dist = fabs(n.dotProduct(pos1vector-pos2vector));
if(dist < min || min < 0)
min = dist;
}
return min;
}
void Display(OrthancClient::Series& series)
{
/**
* Load the 3D image from Orthanc into VTK.
**/
vtkSmartPointer<vtkImageData> image = vtkSmartPointer<vtkImageData>::New();
image->SetDimensions(series.GetWidth(), series.GetHeight(), series.GetInstanceCount());
image->SetScalarType(VTK_SHORT);
image->AllocateScalars();
if (series.GetWidth() != 0 &&
series.GetHeight() != 0 &&
series.GetInstanceCount() != 0)
{
DisplayProgress listener;
series.Load3DImage(image->GetScalarPointer(0, 0, 0), Orthanc::PixelFormat_SignedGrayscale16,
2 * series.GetWidth(), 2 * series.GetHeight() * series.GetWidth(), listener);
}
float sx, sy, sz;
series.GetVoxelSize(sx, sy, sz);
image->SetSpacing(sx, sy, sz);
/**
* The following code is based on the VTK sample for MIP
* http://www.vtk.org/Wiki/VTK/Examples/Cxx/VolumeRendering/MinIntensityRendering
**/
// Create a transfer function mapping scalar value to opacity
double range[2];
image->GetScalarRange(range);
vtkSmartPointer<vtkPiecewiseFunction> opacityTransfer =
vtkSmartPointer<vtkPiecewiseFunction>::New();
opacityTransfer->AddSegment(range[0], 0.0, range[1], 1.0);
vtkSmartPointer<vtkColorTransferFunction> colorTransfer =
vtkSmartPointer<vtkColorTransferFunction>::New();
colorTransfer->AddRGBPoint(0, 1.0, 1.0, 1.0);
colorTransfer->AddRGBPoint(range[1], 1.0, 1.0, 1.0);
vtkSmartPointer<vtkVolumeProperty> property =
vtkSmartPointer<vtkVolumeProperty>::New();
property->SetScalarOpacity(opacityTransfer);
property->SetColor(colorTransfer);
property->SetInterpolationTypeToLinear();
// Create a Maximum Intensity Projection rendering
vtkSmartPointer<vtkFixedPointVolumeRayCastMapper> mapper =
vtkSmartPointer<vtkFixedPointVolumeRayCastMapper>::New();
mapper->SetBlendModeToMaximumIntensity();
mapper->SetInput(image);
vtkSmartPointer<vtkVolume> volume = vtkSmartPointer<vtkVolume>::New();
volume->SetMapper(mapper);
volume->SetProperty(property);
vtkSmartPointer<vtkRenderer> renderer = vtkSmartPointer<vtkOpenGLRenderer>::New();
renderer->AddViewProp(volume);
renderer->SetBackground(0.1, 0.2, 0.3); // Background color dark blue
vtkSmartPointer<vtkInteractorStyleTrackballCamera> style =
vtkSmartPointer<vtkInteractorStyleTrackballCamera>::New();
vtkSmartPointer<vtkRenderWindow> window = vtkSmartPointer<vtkRenderWindow>::New();
window->AddRenderer(renderer);
vtkSmartPointer<vtkRenderWindowInteractor> interactor = vtkSmartPointer<vtkRenderWindowInteractor>::New();
interactor->SetRenderWindow(window);
interactor->SetInteractorStyle(style);
interactor->Start();
}
