CT Scan of a Nicolo Amati Violin

Computed Tomography (CT) evaluation of bowed string instruments is a safe, non-invasive procedure which images all portions of the intact instrument. CT scanning can be used to obtain high resolution transaxial, coronal, and sagital images of normal instrument anatomy. CT also provides a means for the accurate non-invasive measurement of wood thicknesses and wood densities.

CT analysis commonly detects internal pathology and repair not visible on surfaces of the instrument. Pathologic conditions affecting old bowed stringed instruments include cracking, warping, and wormholes (caused by the infestation of a larvae from the beetle, Anobium domesticum). Repair work is readily detected since glue, made from converted collagen, and filler material have a density much greater than the density of wood.

With the violin positioned on its side, outlines of the front plate, back plate, purfling, and the ribs can be easily obtained. A CT derived outline provides the modern luthier with an exact copy of the edges of the instrument, thereby avoiding the compounding errors intrinsic to mechanical tracing techniques traditionally used to create outlines.

Computed tomography provides the modern luthier and acoustical scientist a unique, non-invasive tool which yields important qualitative and quantitative information. CT produces high resolution images of normal instrument anatomy, such as the elegant curves of the outlines and archings. Many pathological conditions commonly affecting old masterpieces, such as wormholes and cracks, can be easily detected and assessed. For any portion of the instrument, CT provides accurate measurements of both wood thicknesses and densities. We believe that CT provides the modern luthier and acoustical scientist with a unique non- invasive imaging and measuring tool which will aid in the accurate reproduction of instruments. CT examination may also play an important role in the valuation and insuring of stringed instruments.