Hello Martin,
MITK supports implicit handling of time in various situations. Many datasets
(such as mitk::Image, mitk::PointSet, mitk::Surface, and others) can be time
resolved, and their visualization classes (e.g. mitk::SurfaceVtkMapper3D)
automatically choose the data to be rendered at the current system time step.
The time concept is also supported by several file readers and writers.
In MITK, time is regarded as an separate dimension. A 3D+t image is not merely
saved and processed as an image of four dimensions, but as a series of
individual 3D images. This is implemented through the concept of Geometry
objects, which describe the spatial and temporal geometry of datasets and
scenes in MITK. Each 3D part of a 3D+t dataset has a defined beginning and end
time point, which is described by its Geometry3D.
The control over the currently selected time step is handled via
mitk::SliceNavigationController. This class is both responsible for selecting
individual slices from a 3D image (to display 2D slices), and for selecting a
time step. In the Qmitk implementation of MITK, the Qt class
QmitkStdMultiWidget holds an instance of SliceNavigationController for temporal
control of the current scene. The global time step can be selected via this
controller class. This is for example done in QmitkSliderDialogBar, a helper
widget which can be used to select the current time step in the application. In
the MITK MainApp application, this can be activated by pressing a toggle in the
main menu bar.
In your implementation, Image::SetVolume() needs to be passed the time
parameter for the given volume:
mitk::Image::Pointer image3DT = mitk::Image::New();
image3DT->Initialize(image1, 2, 3);
image3DT ->SetVolume(image1->GetScalarPointer(), 0); // time step 0
image3DT ->SetVolume(image2->GetScalarPointer(), 1); // time step 1
image3DT ->SetVolume(image3->GetScalarPointer(), 2); // time step 2
Using the concepts briefly described above, it is then not necessary to
implement time handling via ImageTimeSelector and the DataTree manually, but
will be handled automatically by MITK.
Please let us know if you face any further issues with making your application
time supportive!
Regards,
Mathias
From: Martín Bianculli [mailto:[EMAIL PROTECTED]
Sent: Wednesday, October 15, 2008 10:17 AM
To: [email protected]
Subject: [mitk-users] Setting the time step for 3D+t data
Hello everybody,
I'm dealing with 3D+t data.
By the moment, I created a 4D data:
vtkStructuredPoints* image1;
vtkStructuredPoints* image2;
vtkStructuredPoints* image3;
mitk::Image::Pointer image3DT = mitk::Image::New();
image3DT->Initialize(image1, 2, 3);
image3DT ->SetVolume(image1->GetScalarPointer(), 0);
image3DT ->SetVolume(image2->GetScalarPointer(), 0);
image3DT ->SetVolume(image3->GetScalarPointer(), 0);
Now, I want to set the volume image to be rendered.
I did it using the the mitk::ImageTimeSelector:
mitk::ImageTimeSelector::Pointer timeSelector = mitk::ImageTimeSelector::New();
timeSelector->SetInput( dynamic_cast<mitk::Image*>(image3DT );
timeSelector->SetTimeNr( num ); // num is the volume image number
timeSelector->UpdateLargestPossibleRegion();
mitk::DataTreeNode::Pointer timeSliceNode = mitk::DataTreeNode::New();
timeSliceNode->SetData(m_ImageTimeSelector->GetOutput() );
It seems like a low level way of displaying an image.
Is there any way of telling the data tree to render all the 3D+t nodes at a
certain time step?
Something like:
mitk::DataTree::Pointer dataTree = mitk::DataTree::New();
Then create 3D+t data tree nodes, add the nodes to the data tree, and then ask
the data tree to render (set) all the 3D+t nodes at time step t.
mitk::DataTree->SetTimeStep(timeStep t = 2), in order to set all the 3D+t nodes
in the tree to display the same volume image time step.
Thanks in advance,
--
Martín Bianculli
Computational Imaging Lab, Pompeu Fabra University
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