Here’s the DLLs I have to distribute with my application. Yours will likely to be different, since you’re building with Visual Studio and you use only Qt and VTK. This list shows that, in addition to Qt and VTK, you have to distribute the Visual Studio runtime and other possible libraries you may use in the future as well.
libbz2-1.dll*
libfftw3-3.dll*
libfreetype-6.dll*
libgcc_s_seh-1.dll*
libglib-2.0-0.dll*
libgraphite2.dll*
libgsl-23.dll*
libgslcblas-0.dll*
libharfbuzz-0.dll*
libiconv-2.dll*
libicudt58.dll*
libicuin58.dll*
libicuuc58.dll*
libintl-8.dll*
libITKCommon-4.11.dll*
libitkdouble-conversion-4.11.dll*
libitksys-4.11.dll*
libITKTransform-4.11.dll*
libitkv3p_netlib-4.11.dll*
libitkvcl-4.11.dll*
libitkvnl_algo-4.11.dll*
libitkvnl-4.11.dll*
libITKVNLInstantiation-4.11.dll*
libpcre-1.dll*
libpng16-16.dll*
libstdc++-6.dll*
libvtkalglib-8.1.dll*
libvtkCommonColor-8.1.dll*
libvtkCommonComputationalGeometry-8.1.dll*
libvtkCommonCore-8.1.dll*
libvtkCommonDataModel-8.1.dll*
libvtkCommonExecutionModel-8.1.dll*
libvtkCommonMath-8.1.dll*
libvtkCommonMisc-8.1.dll*
libvtkCommonSystem-8.1.dll*
libvtkCommonTransforms-8.1.dll*
libvtkFiltersCore-8.1.dll*
libvtkFiltersExtraction-8.1.dll*
libvtkFiltersGeneral-8.1.dll*
libvtkFiltersGeometry-8.1.dll*
libvtkFiltersHybrid-8.1.dll*
libvtkFiltersModeling-8.1.dll*
libvtkFiltersSources-8.1.dll*
libvtkFiltersStatistics-8.1.dll*
libvtkfreetype-8.1.dll*
libvtkglew-8.1.dll*
libvtkGUISupportQt-8.1.dll*
libvtkImagingCore-8.1.dll*
libvtkImagingFourier-8.1.dll*
libvtkImagingGeneral-8.1.dll*
libvtkImagingHybrid-8.1.dll*
libvtkImagingSources-8.1.dll*
libvtkImagingStencil-8.1.dll*
libvtkInteractionStyle-8.1.dll*
libvtkInteractionWidgets-8.1.dll*
libvtkRenderingAnnotation-8.1.dll*
libvtkRenderingContext2D-8.1.dll*
libvtkRenderingCore-8.1.dll*
libvtkRenderingFreeType-8.1.dll*
libvtkRenderingOpenGL2-8.1.dll*
libvtkRenderingVolume-8.1.dll*
libvtksys-8.1.dll*
libvtkzlib-8.1.dll*
libwinpthread-1.dll*
Qt5Charts.dll*
Qt5Core.dll*
Qt5Gui.dll*
Qt5OpenGL.dll*
Qt5PrintSupport.dll*
Qt5Svg.dll*
Qt5Widgets.dll*
qwt.dll*
zlib1.dll*