diff --git a/src/src/UI/Widget/ImageView/dicomimageview.cpp b/src/src/UI/Widget/ImageView/dicomimageview.cpp
index 90f89df..5fe87e4 100644
--- a/src/src/UI/Widget/ImageView/dicomimageview.cpp
+++ b/src/src/UI/Widget/ImageView/dicomimageview.cpp
@@ -42,6 +42,7 @@ DicomImageView::DicomImageView(QWidget *parent)
     // create layout for main container
     QGridLayout *controlLayout = new QGridLayout(wrapper);
     mGLWidget->setParent(wrapper);
+    mGLRenWin.Get()->SetMultiSamples(8);
     mGLWidget->setRenderWindow(mGLRenWin.Get());
     controlLayout->addWidget(mGLWidget, 0, 0);
 
@@ -649,8 +650,8 @@ void DicomImageView::rotateImage(double angle, TransFormType operation) {
     if (hasSeries()) {
         int slice = mImageViewer->GetSlice();
         resetPanZoom();
-        mImageViewer->GetRenderer()->GetActiveCamera()->Roll(mCurrentRAngle + angle);
-        mCurrentRAngle=mCurrentRAngle+angle;
+        mImageViewer->GetRenderer()->GetActiveCamera()->Roll(angle);
+        mCurrentRAngle=(mCurrentRAngle+(int)angle)%360;
         //to avoid black out problem during slicing
         //slcing is related with rotation, you have to recalculate to get it right
         mImageViewer->GetRenderer()->ResetCameraClippingRange();