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August 20, 2021 21:12
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SequenceToImageStack
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import os | |
import unittest | |
import logging | |
import vtk, qt, ctk, slicer | |
from slicer.ScriptedLoadableModule import * | |
from slicer.util import VTKObservationMixin | |
# | |
# SequenceToImageStack | |
# | |
class SequenceToImageStack(ScriptedLoadableModule): | |
"""Uses ScriptedLoadableModule base class, available at: | |
https://github.com/Slicer/Slicer/blob/master/Base/Python/slicer/ScriptedLoadableModule.py | |
""" | |
def __init__(self, parent): | |
ScriptedLoadableModule.__init__(self, parent) | |
self.parent.title = "SequenceToImageStack" # TODO: make this more human readable by adding spaces | |
self.parent.categories = [""] # TODO: set categories (folders where the module shows up in the module selector) | |
self.parent.dependencies = [] # TODO: add here list of module names that this module requires | |
self.parent.contributors = ["John Doe (AnyWare Corp.)"] # TODO: replace with "Firstname Lastname (Organization)" | |
# TODO: update with short description of the module and a link to online module documentation | |
self.parent.helpText = """ | |
This is an example of scripted loadable module bundled in an extension. | |
See more information in <a href="https://github.com/organization/projectname#SequenceToImageStack">module documentation</a>. | |
""" | |
# TODO: replace with organization, grant and thanks | |
self.parent.acknowledgementText = """ | |
This file was originally developed by Jean-Christophe Fillion-Robin, Kitware Inc., Andras Lasso, PerkLab, | |
and Steve Pieper, Isomics, Inc. and was partially funded by NIH grant 3P41RR013218-12S1. | |
""" | |
# | |
# Register sample data sets in Sample Data module | |
# | |
# | |
# SequenceToImageStackWidget | |
# | |
class SequenceToImageStackWidget(ScriptedLoadableModuleWidget, VTKObservationMixin): | |
"""Uses ScriptedLoadableModuleWidget base class, available at: | |
https://github.com/Slicer/Slicer/blob/master/Base/Python/slicer/ScriptedLoadableModule.py | |
""" | |
def __init__(self, parent=None): | |
""" | |
Called when the user opens the module the first time and the widget is initialized. | |
""" | |
ScriptedLoadableModuleWidget.__init__(self, parent) | |
VTKObservationMixin.__init__(self) # needed for parameter node observation | |
self.logic = None | |
self._parameterNode = None | |
self._updatingGUIFromParameterNode = False | |
def setup(self): | |
""" | |
Called when the user opens the module the first time and the widget is initialized. | |
""" | |
ScriptedLoadableModuleWidget.setup(self) | |
# Load widget from .ui file (created by Qt Designer). | |
# Additional widgets can be instantiated manually and added to self.layout. | |
uiWidget = slicer.util.loadUI(self.resourcePath('UI/SequenceToImageStack.ui')) | |
self.layout.addWidget(uiWidget) | |
self.ui = slicer.util.childWidgetVariables(uiWidget) | |
# Set scene in MRML widgets. Make sure that in Qt designer the top-level qMRMLWidget's | |
# "mrmlSceneChanged(vtkMRMLScene*)" signal in is connected to each MRML widget's. | |
# "setMRMLScene(vtkMRMLScene*)" slot. | |
uiWidget.setMRMLScene(slicer.mrmlScene) | |
# Create logic class. Logic implements all computations that should be possible to run | |
# in batch mode, without a graphical user interface. | |
self.logic = SequenceToImageStackLogic() | |
# Connections | |
# These connections ensure that we update parameter node when scene is closed | |
self.addObserver(slicer.mrmlScene, slicer.mrmlScene.StartCloseEvent, self.onSceneStartClose) | |
self.addObserver(slicer.mrmlScene, slicer.mrmlScene.EndCloseEvent, self.onSceneEndClose) | |
# These connections ensure that whenever user changes some settings on the GUI, that is saved in the MRML scene | |
# (in the selected parameter node). | |
self.ui.inputSelector.connect("currentNodeChanged(vtkMRMLNode*)", self.updateParameterNodeFromGUI) | |
self.ui.outputSelector.connect("currentNodeChanged(vtkMRMLNode*)", self.updateParameterNodeFromGUI) | |
# Buttons | |
self.ui.applyButton.connect('clicked(bool)', self.onApplyButton) | |
# Make sure parameter node is initialized (needed for module reload) | |
self.initializeParameterNode() | |
def cleanup(self): | |
""" | |
Called when the application closes and the module widget is destroyed. | |
""" | |
self.removeObservers() | |
def enter(self): | |
""" | |
Called each time the user opens this module. | |
""" | |
# Make sure parameter node exists and observed | |
self.initializeParameterNode() | |
def exit(self): | |
""" | |
Called each time the user opens a different module. | |
""" | |
# Do not react to parameter node changes (GUI wlil be updated when the user enters into the module) | |
self.removeObserver(self._parameterNode, vtk.vtkCommand.ModifiedEvent, self.updateGUIFromParameterNode) | |
def onSceneStartClose(self, caller, event): | |
""" | |
Called just before the scene is closed. | |
""" | |
# Parameter node will be reset, do not use it anymore | |
self.setParameterNode(None) | |
def onSceneEndClose(self, caller, event): | |
""" | |
Called just after the scene is closed. | |
""" | |
# If this module is shown while the scene is closed then recreate a new parameter node immediately | |
if self.parent.isEntered: | |
self.initializeParameterNode() | |
def initializeParameterNode(self): | |
""" | |
Ensure parameter node exists and observed. | |
""" | |
# Parameter node stores all user choices in parameter values, node selections, etc. | |
# so that when the scene is saved and reloaded, these settings are restored. | |
self.setParameterNode(self.logic.getParameterNode()) | |
# Select default input nodes if nothing is selected yet to save a few clicks for the user | |
if not self._parameterNode.GetNodeReference("InputVolume"): | |
firstSequenceNode = slicer.mrmlScene.GetFirstNodeByClass("vtkMRMLSequenceNode") | |
if firstSequenceNode: | |
self._parameterNode.SetNodeReferenceID("InputVolume", firstSequenceNode.GetID()) | |
def setParameterNode(self, inputParameterNode): | |
""" | |
Set and observe parameter node. | |
Observation is needed because when the parameter node is changed then the GUI must be updated immediately. | |
""" | |
if inputParameterNode: | |
self.logic.setDefaultParameters(inputParameterNode) | |
# Unobserve previously selected parameter node and add an observer to the newly selected. | |
# Changes of parameter node are observed so that whenever parameters are changed by a script or any other module | |
# those are reflected immediately in the GUI. | |
if self._parameterNode is not None: | |
self.removeObserver(self._parameterNode, vtk.vtkCommand.ModifiedEvent, self.updateGUIFromParameterNode) | |
self._parameterNode = inputParameterNode | |
if self._parameterNode is not None: | |
self.addObserver(self._parameterNode, vtk.vtkCommand.ModifiedEvent, self.updateGUIFromParameterNode) | |
# Initial GUI update | |
self.updateGUIFromParameterNode() | |
def updateGUIFromParameterNode(self, caller=None, event=None): | |
""" | |
This method is called whenever parameter node is changed. | |
The module GUI is updated to show the current state of the parameter node. | |
""" | |
if self._parameterNode is None or self._updatingGUIFromParameterNode: | |
return | |
# Make sure GUI changes do not call updateParameterNodeFromGUI (it could cause infinite loop) | |
self._updatingGUIFromParameterNode = True | |
# Update node selectors and sliders | |
self.ui.inputSelector.setCurrentNode(self._parameterNode.GetNodeReference("InputVolume")) | |
self.ui.outputSelector.setCurrentNode(self._parameterNode.GetNodeReference("OutputVolume")) | |
# Update buttons states and tooltips | |
if self._parameterNode.GetNodeReference("InputVolume") and self._parameterNode.GetNodeReference("OutputVolume"): | |
self.ui.applyButton.toolTip = "Compute output volume" | |
self.ui.applyButton.enabled = True | |
else: | |
self.ui.applyButton.toolTip = "Select input and output volume nodes" | |
self.ui.applyButton.enabled = False | |
# All the GUI updates are done | |
self._updatingGUIFromParameterNode = False | |
def updateParameterNodeFromGUI(self, caller=None, event=None): | |
""" | |
This method is called when the user makes any change in the GUI. | |
The changes are saved into the parameter node (so that they are restored when the scene is saved and loaded). | |
""" | |
if self._parameterNode is None or self._updatingGUIFromParameterNode: | |
return | |
wasModified = self._parameterNode.StartModify() # Modify all properties in a single batch | |
self._parameterNode.SetNodeReferenceID("InputVolume", self.ui.inputSelector.currentNodeID) | |
self._parameterNode.SetNodeReferenceID("OutputVolume", self.ui.outputSelector.currentNodeID) | |
self._parameterNode.EndModify(wasModified) | |
def onApplyButton(self): | |
""" | |
Run processing when user clicks "Apply" button. | |
""" | |
try: | |
# Compute output | |
self.logic.process(self.ui.inputSelector.currentNode(), self.ui.outputSelector.currentNode()) | |
except Exception as e: | |
slicer.util.errorDisplay("Failed to compute results: "+str(e)) | |
import traceback | |
traceback.print_exc() | |
# | |
# SequenceToImageStackLogic | |
# | |
class SequenceToImageStackLogic(ScriptedLoadableModuleLogic): | |
"""This class should implement all the actual | |
computation done by your module. The interface | |
should be such that other python code can import | |
this class and make use of the functionality without | |
requiring an instance of the Widget. | |
Uses ScriptedLoadableModuleLogic base class, available at: | |
https://github.com/Slicer/Slicer/blob/master/Base/Python/slicer/ScriptedLoadableModule.py | |
""" | |
def __init__(self): | |
""" | |
Called when the logic class is instantiated. Can be used for initializing member variables. | |
""" | |
ScriptedLoadableModuleLogic.__init__(self) | |
def setDefaultParameters(self, parameterNode): | |
""" | |
Initialize parameter node with default settings. | |
""" | |
if not parameterNode.GetParameter("Threshold"): | |
parameterNode.SetParameter("Threshold", "100.0") | |
if not parameterNode.GetParameter("Invert"): | |
parameterNode.SetParameter("Invert", "false") | |
def process(self, sequence, stack): | |
numFrame = sequence.GetNumberOfDataNodes() | |
appendFilter = vtk.vtkImageAppend() | |
appendFilter.SetAppendAxis(2) | |
ssIndexValues = '' | |
referenceImage = sequence.GetNthDataNode(0) | |
for i in range(0, numFrame): | |
imageNode = sequence.GetNthDataNode(i) | |
imageData = imageNode.GetImageData() | |
appendFilter.AddInputData(imageData) | |
if i > 0: | |
ssIndexValues += ' ' | |
ssIndexValues += str(sequence.GetNthIndexValue(i)) | |
appendFilter.Update() | |
stack.SetAndObserveImageData(appendFilter.GetOutput()) | |
stack.SetAttribute("Time values", ssIndexValues) | |
direction = vtk.vtkMatrix4x4() | |
referenceImage.GetIJKToRASDirectionMatrix(direction) | |
stack.SetIJKToRASDirectionMatrix(direction) | |
spacing = referenceImage.GetSpacing() | |
stack.SetSpacing(spacing) | |
# | |
# SequenceToImageStackTest | |
# | |
class SequenceToImageStackTest(ScriptedLoadableModuleTest): | |
""" | |
This is the test case for your scripted module. | |
Uses ScriptedLoadableModuleTest base class, available at: | |
https://github.com/Slicer/Slicer/blob/master/Base/Python/slicer/ScriptedLoadableModule.py | |
""" | |
def setUp(self): | |
""" Do whatever is needed to reset the state - typically a scene clear will be enough. | |
""" | |
slicer.mrmlScene.Clear() | |
def runTest(self): | |
"""Run as few or as many tests as needed here. | |
""" | |
self.setUp() | |
self.test_SequenceToImageStack1() | |
def test_SequenceToImageStack1(self): | |
""" Ideally you should have several levels of tests. At the lowest level | |
tests should exercise the functionality of the logic with different inputs | |
(both valid and invalid). At higher levels your tests should emulate the | |
way the user would interact with your code and confirm that it still works | |
the way you intended. | |
One of the most important features of the tests is that it should alert other | |
developers when their changes will have an impact on the behavior of your | |
module. For example, if a developer removes a feature that you depend on, | |
your test should break so they know that the feature is needed. | |
""" | |
self.delayDisplay("Starting the test") | |
self.delayDisplay('Test passed') |
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