EllipseGeometry and GeometryDrawing
<Window xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" Title="">
<Canvas>
<Image>
<Image.Source>
<DrawingImage>
<DrawingImage.Drawing>
<DrawingGroup>
<GeometryDrawing Brush="Black">
<GeometryDrawing.Pen>
<Pen Brush="White" Thickness="10"/>
</GeometryDrawing.Pen>
<GeometryDrawing.Geometry>
<GeometryGroup>
<EllipseGeometry RadiusX="15" RadiusY="15" Center="95,95"/>
</GeometryGroup>
</GeometryDrawing.Geometry>
</GeometryDrawing>
</DrawingGroup>
</DrawingImage.Drawing>
</DrawingImage>
</Image.Source>
</Image>
</Canvas>
</Window>
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