QString Get4x4MatrixDoubleAsString(vtkSmartPointer<vtkMatrix4x4> matrix);
int GetSlicerIndexFromItem(QTreeWidgetItem* item);
QTreeWidgetItem* GetItemFromSlicerManager(vvSlicerManager* sm);
QString Get4x4MatrixDoubleAsString(vtkSmartPointer<vtkMatrix4x4> matrix);
int GetSlicerIndexFromItem(QTreeWidgetItem* item);
QTreeWidgetItem* GetItemFromSlicerManager(vvSlicerManager* sm);