diff --git a/Modules/Core/include/mitkArbitraryTimeGeometry.h b/Modules/Core/include/mitkArbitraryTimeGeometry.h
index 8f6504f460..9b82658e8a 100644
--- a/Modules/Core/include/mitkArbitraryTimeGeometry.h
+++ b/Modules/Core/include/mitkArbitraryTimeGeometry.h
@@ -1,252 +1,252 @@
 /*============================================================================
 
 The Medical Imaging Interaction Toolkit (MITK)
 
 Copyright (c) German Cancer Research Center (DKFZ)
 All rights reserved.
 
 Use of this source code is governed by a 3-clause BSD license that can be
 found in the LICENSE file.
 
 ============================================================================*/
 
 #ifndef ArbitraryTimeGeometry_h
 #define ArbitraryTimeGeometry_h
 
 //MITK
 #include <mitkTimeGeometry.h>
 #include <mitkCommon.h>
 #include <MitkCoreExports.h>
 
 namespace mitk
 {
   /**
   * \brief Organizes geometries over arbitrary defined time steps
   *
   * For this TimeGeometry implementation it is assumed that
   * the durations of the time steps are arbitrary and may differ.
   * The geometries of the time steps are independent,
   * and not linked to each other. Since the timeBounds of the
   * geometries are different for each time step it is not possible
   * to set the same geometry to different time steps. Instead
   * copies should be used.
   * @remark The lower time bound of a succeeding time step may not be smaller
   * than the upper time bound of its predecessor. Thus the list of time points is
   * always sorted by its lower time bounds.
   * @remark For the conversion between time step and time point the following assumption
   * is used.:\n
   * time step -> time point: time point is the lower time bound of the geometry indicated by step.\n
   * time point -> time step: associated time step is last step which lower time bound is smaller or equal then the time
   * point.
   *
   * \addtogroup geometry
   */
   class MITKCORE_EXPORT ArbitraryTimeGeometry : public TimeGeometry
   {
   public:
     mitkClassMacro(ArbitraryTimeGeometry, TimeGeometry);
 
     ArbitraryTimeGeometry();
     typedef ArbitraryTimeGeometry self;
     itkFactorylessNewMacro(Self);
     itkCloneMacro(Self);
 
       /**
       * \brief Returns the number of time steps.
       *
       * Returns the number of time steps for which
       * geometries are saved. The number of time steps
       * is also the upper bound of the time steps. The
       * minimum time steps is always 0.
       */
       TimeStepType CountTimeSteps() const override;
     /**
     * \brief Returns the first time point for which the time geometry instance is valid.
     *
     * Returns the first valid time point for this geometry. It is the lower time bound of
     * the first step. The time point is given in ms.
     */
     TimePointType GetMinimumTimePoint() const override;
     /**
     * \brief Returns the last time point for which the time geometry instance is valid
     *
     * Gives the last time point for which a valid geometry is saved in
     * this time geometry. It is the upper time bound of the last step.
     * The time point is given in ms.
     */
     TimePointType GetMaximumTimePoint() const override;
 
     /**
     * \brief Returns the first time point for which the time geometry instance is valid.
     *
     * Returns the first valid time point for the given TimeStep. The time point
     * is given in ms.
     */
     TimePointType GetMinimumTimePoint(TimeStepType step) const override;
     /**
     * \brief Returns the last time point for which the time geometry instance is valid
     *
     * Gives the last time point for the Geometry specified by the given TimeStep. The time point is given in ms.
     */
     TimePointType GetMaximumTimePoint(TimeStepType step) const override;
 
     /**
     * \brief Get the time bounds (in ms)
     * it returns GetMinimumTimePoint() and GetMaximumTimePoint() results as bounds.
     */
     TimeBounds GetTimeBounds() const override;
 
     /**
     * \brief Get the time bounds for the given TimeStep (in ms)
     */
     TimeBounds GetTimeBounds(TimeStepType step) const override;
 
     /**
     * \brief Tests if a given time point is covered by this time geometry instance
     *
     * Returns true if a geometry can be returned for the given time
     * point (so it is within GetTimeBounds() and fails if not.
     * The time point must be given in ms.
     */
     bool IsValidTimePoint(TimePointType timePoint) const override;
     /**
     * \brief Test for the given time step if a geometry is availible
     *
     * Returns true if a geometry is defined for the given time step.
     * Otherwise false is returned.
     * The time step is defined as positiv number.
     */
     bool IsValidTimeStep(TimeStepType timeStep) const override;
     /**
     * \brief Converts a time step to a time point
     *
     * Converts a time step to a time point by using the time steps lower
     * time bound.
     * If the original time steps does not point to a valid geometry,
     * a time point is calculated that also does not point to a valid
     * geometry, but no exception is raised.
     */
     TimePointType TimeStepToTimePoint(TimeStepType timeStep) const override;
     /**
     * \brief Converts a time point to the corresponding time step
     *
     * Converts a time point to a time step in a way that
     * the new time step indicates the same geometry as the time point.
     * The associated time step is the last step which lower time bound
     * is smaller or equal then the time point.
     * If a negative invalid time point is given always time step 0 is
     * returned. If a positive invalid time point is given the last time
     * step will be returned. This is also true for time points that are
     * exactly on the upper time bound (the only exception is the final
     * time step in case that HasCollapsedFinalTimeStep() is true).
     */
     TimeStepType TimePointToTimeStep(TimePointType timePoint) const override;
     /**
     * \brief Returns the geometry which corresponds to the given time step
     *
     * Returns a clone of the geometry which defines the given time step. If
     * the given time step is invalid an null-pointer is returned.
     */
     BaseGeometry::Pointer GetGeometryCloneForTimeStep(TimeStepType timeStep) const override;
 
     /**
     * \brief Returns the geometry which corresponds to the given time point
     *
     * Returns the geometry which defines the given time point. If
     * the given time point is invalid an null-pointer is returned.
     *
     * If the returned geometry is changed this will affect the saved
     * geometry.
     */
     BaseGeometry::Pointer GetGeometryForTimePoint(TimePointType timePoint) const override;
     /**
     * \brief Returns the geometry which corresponds to the given time step
     *
     * Returns the geometry which defines the given time step. If
     * the given time step is invalid an null-pointer is returned.
     *
     * If the returned geometry is changed this will affect the saved
     * geometry.
     */
     BaseGeometry::Pointer GetGeometryForTimeStep(TimeStepType timeStep) const override;
 
     /**
     * \brief Tests if all necessary informations are set and the object is valid
     */
     bool IsValid() const override;
 
     /**
     * \brief Initializes a new object with one time steps which contains an empty geometry.
     */
     void Initialize() override;
 
     /**
     * \brief Expands the time geometry to the given number of time steps.
     *
     * Initializes the new time steps with empty geometries. This default geometries will behave like
     * ProportionalTimeGeometry.
     * Shrinking is not supported. The new steps will have the same duration like the last step before extension.
     */
     void Expand(TimeStepType size) override;
 
     /**
     * \brief Replaces the geometry instances with clones of the passed geometry.
     *
     * Replaces the geometries of all time steps with clones of the passed
     * geometry. Replacement strategy depends on the implementation of TimeGeometry
     * sub class.
     * @remark The time points itself stays untouched. Use this method if you want
     * to change the spatial properties of a TimeGeometry and preserve the time
     * "grid".
     */
     void ReplaceTimeStepGeometries(const BaseGeometry *geometry) override;
 
     /**
     * \brief Sets the geometry for the given time step
     *
     * If passed time step is not valid. Nothing will be changed.
     * @pre geometry must point to a valid instance.
     */
     void SetTimeStepGeometry(BaseGeometry *geometry, TimeStepType timeStep) override;
 
     /**
     * \brief Makes a deep copy of the current object
     */
     itk::LightObject::Pointer InternalClone() const override;
 
     void ClearAllGeometries();
 
     /** Append the passed geometry to the time geometry.
      * @pre The passed geometry pointer must be valid.
      * @pre The minimumTimePoint must not be smaller than the maximum time point of the currently last time step.
      * Therefore time steps must not be overlapping in time.
      * @pre minimumTimePoint must not be larger then maximumTimePoint.*/
     void AppendNewTimeStep(BaseGeometry *geometry, TimePointType minimumTimePoint, TimePointType maximumTimePoint);
 
     /** Same than AppendNewTimeStep. But clones geometry before adding it.*/
     void AppendNewTimeStepClone(const BaseGeometry* geometry,
                               TimePointType minimumTimePoint,
                               TimePointType maximumTimePoint );
 
     void ReserveSpaceForGeometries( TimeStepType numberOfGeometries );
 
     void PrintSelf(std::ostream &os, itk::Indent indent) const override;
 
     /** This is a helper that indicates problematic corner cases that often occure e.g. when loading
     dynamic DICOM data. There the final time step is collapsed as min time bound and max time bound
-    have the same value. For a more detailed explination why it happens please see:
+    have the same value. For a more detailed explanation why it happens please see:
     https://phabricator.mitk.org/T24766#131411 and https://phabricator.mitk.org/T27259#203524
     */
     bool HasCollapsedFinalTimeStep() const;
 
   protected:
     ~ArbitraryTimeGeometry() override;
 
     std::vector<BaseGeometry::Pointer> m_GeometryVector;
     std::vector<TimePointType> m_MinimumTimePoints;
     std::vector<TimePointType> m_MaximumTimePoints;
 
   }; // end class ArbitraryTimeGeometry
 
 } // end namespace MITK
 #endif // ArbitraryTimeGeometry_h