Calculate text line height for "Arial Unicode MS" font?

I am trying to render the text to image similar to MS Word page, but the text line height measured using GDI+ in C# Graphics.MeasureString() method) is less than line height in MS Word specific for "Arial Unicode MS" font. Do any one know, how MS Word calculates line height for "Arial Unicode MS" font?

If any algorithm used by MS Word to measure text?