THz-TDI has been applied for imaging an hidden painting and other subsurface composition layers of a 17C panel painting belonging to the National Gallery of Denmark. C- and B-scans realized by THz have been compared with images obtained by x-ray radiography, thus helping in a deep understanding of the strengths and limitations of this technique for art diagnostic purpose and in defining its rule among the other complementary investigation tools for art pieces inspection.
Koch Dandolo, C. L., Filtenborg, T. F., Uhd Jepsen, P., & Skou-Hansen, J. (2015). Analysis of a 17C Panel Painting by Reflection Terahertz Time Domain-Imaging (THz-TDI): contribution of ultrafast optics to museum collections inspection. Applied Physics A, 121(3). https://doi.org/10.1007/s00339-015-9303-0