diff --git a/code/algorithms/rttbDoseToVolumeMeasureCollectionCalculator.cpp b/code/algorithms/rttbDoseToVolumeMeasureCollectionCalculator.cpp
index 51432bf..9548408 100644
--- a/code/algorithms/rttbDoseToVolumeMeasureCollectionCalculator.cpp
+++ b/code/algorithms/rttbDoseToVolumeMeasureCollectionCalculator.cpp
@@ -1,71 +1,71 @@
 // -----------------------------------------------------------------------
 // RTToolbox - DKFZ radiotherapy quantitative evaluation library
 //
 // Copyright (c) German Cancer Research Center (DKFZ),
 // Software development for Integrated Diagnostics and Therapy (SIDT).
 // ALL RIGHTS RESERVED.
 // See rttbCopyright.txt or
 // http://www.dkfz.de/en/sidt/projects/rttb/copyright.html
 //
 // This software is distributed WITHOUT ANY WARRANTY; without even
 // the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
 // PURPOSE.  See the above copyright notices for more information.
 //
 //------------------------------------------------------------------------
 /*!
 // @file
 // @version $Revision: 1674 $ (last changed revision)
 // @date    $Date: 2017-01-27 10:34:46 +0100 (Fr, 27 Jan 2017) $ (last change date)
 // @author  $Author: hentsch $ (last changed by)
 */
 
 #include "rttbDoseToVolumeMeasureCollectionCalculator.h"
 #include <boost/thread/thread.hpp>
 #include "rttbInvalidParameterException.h"
 //#include <boost/thread/locks.hpp> 
 
 namespace rttb
 {
 
 	namespace algorithms
 	{
 		DoseToVolumeMeasureCollectionCalculator::DoseToVolumeMeasureCollectionCalculator(const std::vector<double>& precomputeDoseValues,
 			const DoseTypeGy referenceDose, const core::DoseIteratorInterface::DoseIteratorPointer doseIterator,
 			DoseToVolumeMeasureCollection::complexStatistics name, bool multiThreading) : _measureCollection(DoseToVolumeMeasureCollection(name)),
 			_precomputeDoseValues(precomputeDoseValues), _referenceDose(referenceDose), _doseIterator(doseIterator), _multiThreading(multiThreading) {}
 
 		void DoseToVolumeMeasureCollectionCalculator::compute()
 		{
 			std::vector<boost::thread> threads;
 
 			for (size_t i = 0; i < _precomputeDoseValues.size(); ++i)
 			{
 				double xAbsolute = _precomputeDoseValues.at(i) * _referenceDose;
-				if (true)
+				if (_multiThreading)
 				{
-					//throw rttb::core::InvalidParameterException("MultiThreading is not implemented yet.");
-					threads.push_back(boost::thread(&DoseToVolumeMeasureCollectionCalculator::insertIntoMeasureCollection, this , xAbsolute, computeSpecificValue(xAbsolute)));
+					throw rttb::core::InvalidParameterException("MultiThreading is not implemented yet.");
+					//threads.push_back(boost::thread(&DoseToVolumeMeasureCollectionCalculator::insertIntoMeasureCollection, this , xAbsolute, computeSpecificValue(xAbsolute)));
 				}
 				else
 				{
 					insertIntoMeasureCollection(xAbsolute, this->computeSpecificValue(xAbsolute));
 				}
 			}
 
 			for (unsigned int i = 0; i<threads.size(); i++)
 			{
 				threads.at(i).join();
 			}
 		}
 
 		DoseToVolumeMeasureCollection DoseToVolumeMeasureCollectionCalculator::getMeasureCollection()
 		{
 			return _measureCollection;
 		}
 
 		void DoseToVolumeMeasureCollectionCalculator::insertIntoMeasureCollection(DoseTypeGy xAbsolute, VolumeType resultVolume)
 		{
 			_measureCollection.insertValue(xAbsolute, resultVolume);
 		}
 	}
 }