Abstract Archives of the RSNA, 2011


SSJ12-06

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

Scientific Formal (Paper) Presentations

Presented on November 29, 2011
Presented as part of SSJ12: Informatics (New Technologies)

Participants

Steven A. Sirr MD, Presenter: Nothing to Disclose
John Waddle, Abstract Co-Author: Nothing to Disclose
Steve Rossow, Abstract Co-Author: Nothing to Disclose

CONCLUSION

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.

BACKGROUND

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.

EVALUATION

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.

DISCUSSION

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.

Cite This Abstract

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