Steven A. Sirr MD, Presenter: Nothing to Disclose

John Waddle, Abstract Co-Author: Nothing to Disclose

Steve Rossow, Abstract Co-Author: Nothing to Disclose

We have used CT DICOM files of a 1704 Stradivari violin, transformed DICOM data into .stl files which were then imported into a 3D CNC routing machine. The CNC machine then carved extremely accurate copies of the front and back plates and scroll of the original violin. We believe our novel process of re-creating old and valuable stringed instruments may have a profound influence upon modern string musicians.

We have previously shown CT scanning of old and valuable stringed instruments provides today’s luithers with extremely valuable information including wood density and accurate measurements of lengths, shapes, archings, and thicknesses of top and back plates. Using computer numerically controlled (CNC) machining, a process by which a computer is connected to a 3D precision-carving machine, we turn CT digital data into nearly exact copies, matching the original wood as closely as possible.

We have used CT DICOM files of a violin crafted by Antonio Stradivari in 1704 to create a violin of extreme accuracy to the original. This was performed by importing DICOM files into OsiriX (v. 3.7.1) and creating stereolithograph (.stl) files of the scroll, front and back plates. Stereolithographic files were imported into a high quality CNC machine and using Rhinoceros software, nearly exact copies were carved into maple back plates, spruce front plates and maple scrolls. These parts were assembled into the “white" violin and then varnished. We believe this technique allows us to copy old and valuable instruments with a high degree of accuracy.

We have previously shown CT to be useful in measuring wood density, size and shapes, thicknesses, graduations, and volume measurements. CT also provides detailed analysis of damage and repair from worms and cracks. We have used CT DICOM files of a Stradivari violin converted into .stl files and then carved into wooden parts duplicating the original 1704 Stradivari violin. The resulting violin has characteristics remarkably similar to the original. The figure illustrates the original scroll, a digital CT 3D volume representation, and a photograph of the new scroll.

Sirr, S, Waddle, J, Rossow, S, Re-creation of a Violin Crafted by Antonio Stradivarius in Cremona, Italy, 1704: CT DICOM Files Transformed into Stereolithograhic Files for CNC Router Producing Nearly Exact Copies.  Radiological Society of North America 2011 Scientific Assembly and Annual Meeting, November 26 - December 2, 2011 ,Chicago IL. http://archive.rsna.org/2011/11000445.html