X-Ray µCT Scan of a Guadagnini Viol

07 Aug 2018

Scans of instruments like violins and viols can be represented as high-quality images. A spatial resolution of 100 µm voxel size allows for the examination of all structural elements. Even minuscule details, like tool marks, vestiges of prior repairs, and micro cracks can be rendered visible. Thickness measurements can be performed with high precision. The cross sections of the soundboard can be used for dendrochronological dating. By extracting the surface, the data set can be used for the replication of all individual parts of the instrument using 3D-printing or CNC-milling with an accuracy of max. 0.1 mm deviation. Even wood density can be determined for all parts.

In the volume rendering of the soundboard a horizontal reinforcement of the bass bar is clearly visible. The cross section at this position shows that it caused a flat deformation of the arching. It might be considered to remove this part in order to correct the arching. The other reinforcements and the soundpost patch in the back can be examined as well.