mImageContour[slicer]->Update(mThresholdSlider1->GetValue());
if (mRadioButtonLowerThan->isChecked())
mImageContourLower[slicer]->Update(mThresholdSlider2->GetValue());
mImageContour[slicer]->Update(mThresholdSlider1->GetValue());
if (mRadioButtonLowerThan->isChecked())
mImageContourLower[slicer]->Update(mThresholdSlider2->GetValue());