void checkImagesEqual(cx::ImagePtr input1, cx::ImagePtr input2)
	{
		REQUIRE(input1);
		REQUIRE(input2);
		CHECK(input1->getModality() == input2->getModality());
		CHECK(cx::similar(input1->getInitialWindowLevel(), input2->getInitialWindowLevel()));
		CHECK(cx::similar(input1->getInitialWindowWidth(), input2->getInitialWindowWidth()));
		CHECK(cx::similar(input1->get_rMd(), input2->get_rMd(), 1.0E-2));
		checkImagesEqual(input1->getBaseVtkImageData(), input2->getBaseVtkImageData());
	}
Eigen::Array3i IGTLinkConversionFixture::getValue3i(cx::ImagePtr data, int x, int y, int z)
{
    vtkImageDataPtr volume = data->getBaseVtkImageData();
    unsigned char* ptr = reinterpret_cast<unsigned char*>(volume->GetScalarPointer(x,y,z));
    return Eigen::Array3i(ptr[0], ptr[1], ptr[2]);
}